ABS Plastic Cosmetic Tube

ABS resin cosmetics tubes is one of the five synthetic resin, its impact resistance, heat resistance, low temperature resistance, chemical resistance and excellent electrical properties, but also has easy processing and products good size stability, surface gloss, easy painting, coloring, also can undertake surface spraying, electroplating, metal welding, hot pressing and adhesion and other secondary processing, Acrylonitrile - butadiene - styrene copolymer is a terpolymer composed of acrylonitrile, butadiene and styrene.

Graft copolymer of ABS cosmetics tube resin main chain; Or a mixture of rubber elastomer and hard ABS cosmetic tube resin. In this way, different structures show different performance, elastomer shows the toughness of rubber, hard AS resin shows the rigidity, can get high impact type, impact type, general impact type and special impact type several varieties. Specifically, with the content of rubber component B (generally 5%~30%) increase, the elasticity and impact resistance of resin will increase; But tensile strength, fluidity, weather resistance, etc. The content of resin component AS (generally 70%~95%) increases, it can improve the surface gloss, mechanical strength, weather resistance, heat resistance, corrosion resistance, electrical properties, processing properties, etc. And the impact strength and so on will decrease. The proportion of A and B in resin components is 30%-35% / 80%-65% respectively.

Plastic ABS cosmetic tube resin is the largest yield, the most widely used polymer, it will be PB, PAN, PS various properties organically unified, both tough, hard, rigid phase balance of excellent mechanical properties. ABS cosmetic tube is A terpolymer of acrylonitrile, butadiene and styrene, with A for acrylonitrile, B for butadiene and S for styrene. After practical use, it is found that ABS cosmetic tube plastic tube is not resistant to sulphuric acid corrosion, and will shatter when met with sulphuric acid.

Because it has three kinds of components, it is endowed with very good performance. Acrylonitrile gives ABS cosmetic tube resin chemical stability, oil resistance, a certain stiffness and hardness; The toughness, impact and cold resistance of butadiene were improved. Styrene makes it have good dielectric properties and good processability.

Most ABS cosmetics tube is non-toxic, impervious to water, but slightly through water vapor, water absorption rate is low, room temperature immersion water absorption rate of a year is not more than 1% and physical properties do not change. ABS cosmetic tube resin products can be polished surface, can get a high gloss products.

ABS cosmetic tube has excellent comprehensive physical and mechanical properties, excellent low temperature impact resistance. Dimensional stability. Electrical properties, wear resistance, chemical resistance, dyeing, finished product processing and mechanical processing is better. ABS Cosmetics tube resin is resistant to water, inorganic salts, alkali and acid, insoluble in most alcohols and hydrocarbon solvents, and easily soluble in aldehydes, ketones, esters and some chlorinated hydrocarbons. ABS cosmetic tube resin thermal deformation temperature is low flammable, poor weather resistance. The melting temperature ranges from 217 ℃ to 237℃, and the thermal decomposition temperature is above 250℃. Today's market modified ABS cosmetic tube materials, many are doped with mouth material, recycled material. As a result, the customer molding product performance is not very stable.

The material performance

Good comprehensive performance, high impact strength, chemical stability, good electrical performance;

With 372 plexiglass fusion good, made of two-color plastic parts, and can be surface chrome plating, paint processing;

High impact resistance, high heat resistance, flame retardant, reinforcement, transparency and other levels;

Fluidity is less than HIPS, better than PMMA, PC, good flexibility;

formability

Amorphous materials, medium fluidity, hygroscopic, must be fully dry, the surface of the shiny plastic parts must be preheated for a long time to dry 80-90 degrees,3 hours;

Suitable for high material temperature, high mold temperature, but the material temperature is too high and easy to decompose (decomposition temperature >270 degrees). For high precision plastic parts, mold temperature suitable for 50-60 degrees, high gloss. Heat resistant plastic parts, mold temperature suitable for 60-80 degrees;

If you need to solve the water clamp, you need to improve the fluidity of the material, take high material temperature, high mold temperature, or change the water level and other methods;

If heat-resistant or flame-retardant materials are formed, plastic decomposition will remain on the surface of the mold after 3-7 days of production, resulting in shiny surface of the mold. It is necessary to clean the mold in time and increase the exhaust position on the surface of the mold.

The cooling speed is fast, the mold pouring system should be thick, short as the principle, it is appropriate to set up cold hole, the gate should be large, such as: direct gate, disk gate or fan gate, but should prevent the increase of internal stress, when necessary, can use the adjustment gate. The mould should be heated, wear-resistant steel should be selected;

Material temperature has a great influence on the quality of plastic parts, material temperature is too low will cause lack of material, the surface is dull, silver wire disorder material temperature is too high and easy to overflow edge, silver wire dark strip, plastic parts change color bubbles;

The mold temperature has a great influence on the quality of plastic parts. When the mold temperature is low, shrinkage, elongation, impact strength, bending resistance, compression resistance and tensile strength are low. When the mold temperature is more than 120 degrees, the cooling of plastic parts is slow, easy to deform and stick, demoulding is difficult, and the molding cycle is long.

Molding shrinkage rate is small, easy to occur melting cracking, stress concentration, so molding should be strictly controlled molding conditions, molding plastic parts should be annealed;

Melt temperature is high, high viscosity, not sensitive to shear action, for more than 200 grams of plastic parts, should be used screw injection machine, nozzle should be heated, should use open type extension nozzle, injection speed in high speed.

Plastic ABS cosmetics tube non-toxic, tasteless, the appearance of ivory translucent, or transparent particles or powder. Density is 1.05~1.18g/ CMS 3, shrinkage is 0.4%~0.9%, elastic modulus value is 2Gpa, Poisson ratio is 0.394, hygroscopicity <1%, melting temperature is 217~237℃, thermal decomposition temperature is >250℃.

Mechanical properties of

Plastic ABS cosmetic tube has excellent mechanical properties, its impact strength is excellent, can be used at very low temperature; Plastic ABS cosmetic tube has excellent wear resistance, good dimensional stability and oil resistance, which can be used for bearings under medium load and low speed. The creep resistance of ABS cosmetic tube is greater than that of PSF and PC, but smaller than that of PA and POM.

The thermal performance

The thermal deformation temperature of plastic ABS cosmetic tube is 93~118℃, and the product can be increased by about 10℃ after annealing. ABS cosmetic tube can still show some toughness at -40℃, can be used in the temperature range of -40~100℃.

Electrical performance

The plastic ABS cosmetic tube is electrically insulated and almost impervious to temperature, humidity and frequency, allowing it to be used in most environments.

Environmental performance

Plastic ABS cosmetic tube is not affected by water, inorganic salts, alkali and a variety of acids, but soluble in ketones, aldehydes and chlorinated hydrocarbons, by acetic acid, vegetable oil erosion will produce stress cracking. ABS cosmetics tube has poor weather resistance and is easy to degrade under the action of ultraviolet light. After six months outdoors, the impact strength decreases by half.

There are many production methods of ABS cosmetic tube, which can be divided into four categories: mixing method, grafting method, combined with a grafting - mixing method, and about eleven preparation processes. Nowadays most of the emulsion method is used, the most promising is the emulsion grafting method. ABS cosmetic tube by changing the proportion of three monomers and the use of different polymerization methods, can be made of various specifications of products, its structure is based on elastic chain graft copolymer and resin based chain graft copolymer, generally three monomer proportion range is roughly 25%~35% acrylonitrile, 25%~30% butadiene and 40%~50% styrene.

Because PC/ABS cosmetic tube is a blend of two polymers, and mainly PC, in the processing of products, sometimes also found in the gate of the spotted phenomenon, usually due to high-speed injection, molten expansion into the cavity caused by. Melt rupture. From the molding process, we can take measures to improve the temperature of the material, improve the temperature of the nozzle, slow down the injection speed to reduce the appearance of PC/ABS cosmetic tube products markings, can also improve the mold temperature, add excess groove, increase the size of the gate, modify the shape of the gate to solve. For example, for large thin wall parts using fan-shaped gate, can also be used ear gate, add an ear groove at the gate outlet, so that the spray near the gate, material flow impact spots, and residual stress are concentrated in the ear groove, and does not affect the quality of PC/ABS cosmetics tube parts. At the same time, as a result of multiple gate injection or shunt, there will be welding wiring.

Molding process

Plastic ABS cosmetics tube also can be said to be the modification of polystyrene, than the HIPS have higher impact strength and better mechanical strength, good processability, injection molding machine, extrusion machine, plastic molding equipment can be used for injection molding, extrusion, blow molding, calendering, laminating, foaming, thermoforming, also can welding, coating, electroplating, and mechanical processing. ABS cosmetics tube water absorption is relatively high, need to be dried before processing, drying temperature is 70~85℃, drying time is 2~6h; ABS cosmetics tube products are easy to produce internal stress in processing, such as too much stress, resulting in cracking of the product, should be annealed, the product is placed in 70~80℃ hot air circulation drying box for 2~4h, and then cooled to room temperature.

Extrusion process

Extrusion. Plastic ABS cosmetic tube production tube, plate, sheet, and profile products, tube can be used for all kinds of water tube, gas tube, lubricating oil and fuel oil transmission tube; Sheet, sheet can be used for floor, furniture, tank, filter, wall insulation and thermal forming or vacuum forming. The screw length-to-diameter ratio of extruder is usually relatively high, L/D is 18~22, compression ratio is (2.5~3.0):1, it is appropriate to use gradual change type screw with torpedo head, barrel temperature is: hopper part 150~160℃, barrel front 180~190℃, die head temperature 185~195℃, die temperature 180~200℃, Secondly, blow molding temperature can be controlled between 140~180℃.

Injection molding process

ABS cosmetic tube resin is a terpolymer developed on the basis of polystyrene resin modification. A stands for propylene, B for butadiene, and S for styrene. ABS cosmetic tube resin has three components of the comprehensive performance, A can improve oil resistance, chemical corrosion resistance, so as to have A certain surface hardness; B make ABS cosmetics tube show rubber toughness, improve the impact toughness; S makes ABS cosmetic tube plastic show better fluidity, so that it has good performance of thermoplastic molding.

manufacturability

ABS cosmetic tube is an amorphous polymer with no obvious melting point. Due to its various grades, in the process of injection molding should be made according to the different grades of appropriate process parameters, generally in 160℃ above, 240℃ can be formed. Due to high temperature, the rubber phase in ABS cosmetics tube tends to be destroyed and begins to decompose above 250℃. In the process of forming, ABS cosmetics tube thermal stability is good, a wide range of choices, not easy to degrade or decomposition. And ABS cosmetics tube melt viscosity moderate, its fluidity is better than PVC, polycarbonate, and melt cooling curing speed is relatively fast, generally in 5 ~ 15S can be cold solid. ABS cosmetics tube liquidity and injection temperature and injection pressure are related, injection pressure is slightly more sensitive. Therefore, in the molding process can be from the injection pressure hand, in order to reduce the melt viscosity, improve the filling performance. ABS cosmetics tube because of different components, water absorption and adhesion water performance is different, its surface adhesion water and water absorption rate in 0.2 ~ 0.5% sometimes up to 0.3 ~ 0.8% between, in order to get more ideal products, before forming for drying treatment, so that the water content is reduced to 0,1% below. Otherwise the surface of the parts will appear bubbles, silver and other defects.

Injection molding equipment

The screw injection molding machine is selected to make the plastic in the barrel heated by the electric heating ring and the rotary friction of the barrel screw heating for pre-plastic melt injection into the cavity, after cooling and opening the mold top out of the product. Good plasticizing effect, forming temperature can be slightly lower than other types of equipment (such as plunger type). Avoid high temperature damage to rubber phase. Attention should be paid to :1) Each injection volume should be 50 ~ 75% of the maximum injection volume of the equipment; 2) Screw screw with single head, equal distance, gradual change, full thread, with check ring. The L/D of the screw is 20:1, and the compression ratio is 2 or 2.5:1,3) the nozzle can be open universal nozzle or extended nozzle (the extension length is not more than 150min), avoid the use of self-locking nozzle, in order to reduce the injection process or cause material discolation. In addition, the nozzle should also be provided with a heating temperature control device.

Product and mold design

1. Wall thickness of the product: the wall thickness of the product is related to the flow length of the melt, production efficiency, use requirements, etc. ABS cosmetics tube melt maximum flow length and product wall thickness ratio of about 190:1, this value will vary due to different grades, therefore, ABS cosmetics tube product wall thickness should not be too thin, for the need for electroplating products, the wall thickness is slightly thicker, in order to increase the coating and product surface adhesion. The wall thickness of this product should be selected between 1.5 ~ 4.5mm.

When considering the wall thickness of the product, also should pay attention to the uniformity of the wall thickness, do not differ too much, for the need for electroplating products, the surface should be smooth without concave and convex, because these parts due to electrostatic action easy adhesion dust is difficult to remove, resulting in poor fastness of the coating. In addition, the existence of sharp angles should also be avoided to prevent stress concentration, so it is advisable to use arc transition for corners, thick-thin joints and other parts. _

2 demoulding slope: the demoulding slope of the product has a direct relationship with its shrinkage rate, due to the different grade, the different shape of the product and the different forming conditions, there is a certain difference in the shrinkage rate, generally in 0.3 ~ 0.6%, sometimes up to 0.4 ~ 0.8%, so its products molding dimension accuracy is higher. For ABS cosmetic tube products, the demoulding Angle is considered as: the core part along the demoulding direction is 31°, and the cavity part along the demoulding direction is 4(/ 1 1°20'. For more complex shapes or with letters, patterns of products, the demoulding slope should be appropriately increased.

3. Ejection requirements: due to the products of the apparent finish have larger influence the performance of electroplating, apparent on any tiny wound is clearly revealed after plating, so in addition to the requirements on the cavity is not allowed to have any scars, want out the effective area is larger, the multiple root plunger in the ejection process synchronization is better, contribute to uniform.

4. Exhaust: In order to prevent bad exhaust in the process of filling the mold, so that the molten burn, obvious joint line and other problems, it is required to open a depth of no more than 0.04mm vent or exhaust groove, to facilitate the gas generated by the molten inch discharge.

5.Runner and gate: in order to make ABS cosmetics tube melt can fill each part of the mold cavity as soon as possible, the diameter of the runner is not less than 5mm, the thickness of the gate is more than 30% of the thickness of the product, and the length of the straight part (refers to the part that will enter the cavity) is about 1mm. The location of the gate should be determined according to the requirements of the product and the direction of the material flow. For the products that need to be electroplated, the gate is not allowed to exist on the surface of the coating.

Raw material preparation

ABS cosmetic tube resin for injection molding is mostly light ivory or porcelain white opaque particles, except for special grade or coloring resin. Resin water absorption is not very high, such as in the processing allowable value of 0.1 ~ 02% below, for tight packaging, proper storage and product requirements are not too high, without drying processing can be molded. But if the moisture content in the particles is too specified value, it must be processed by drying before forming, for special grade particles or products have higher requirements (such as electroplating products), before forming must also be processed by drying.

Molding process specification

1. Injection temperature: including barrel temperature (also can be divided into the last, middle and first three sections), nozzle temperature and mold temperature. Although the influence of temperature on the melt viscosity of ABS cosmetics tube is not as obvious as the injection pressure, it is favorable for the mold of thin-walled products under the condition of high temperature. ABS cosmetics tube decomposition temperature, in theory as high as 270t: above, but in the actual injection process, due to the influence of time and other process conditions, resin often began to change color in about 2501, at the same time ABS cosmetics tube rubber phase also does not adapt to high temperature, otherwise it will affect the product performance. ABS cosmetics tube molding temperature levels in addition to the heat, electroplating and other grades of resin for slightly higher temperature (210-2501) to change zhu melt molding difficult or for electroplating performance, for gm, flame retardant, resistance to impact grade ABS resin cosmetics tubes are in lower temperature, to prevent decomposition or against the physical and mechanical properties. Plug injection machine than screw injection machine to choose a slightly higher temperature, for general products, the piston selection temperature range between 180 ~ 2301, and screw injection molding machine in 160 ~ 220X: can be formed. During the molding process, the general cylinder temperature (150 ~ 1701C at the back, 170 ~ 180"€at the middle, 180 ~ 210C at the front). Nozzle temperature is generally taken from 170 to 180C, special attention is paid to the homogenization section and any change in nozzle temperature, will be reflected in the products, causing overspill, silver, color change, poor luster, obvious weld marks and other defects.

2. Mold temperature: mold temperature plays an important role in surface roughness of ABS cosmetic tube products and reducing internal stress of products. The mold temperature is high, the melt filling mold is easy, the appearance of the product is good, the internal stress is small, and the electroplating ability of the product is also improved or improved, but there are also problems such as large shrinkage rate of the product forming, long molding cycle, and easy to demoulding. For general requirements of the products, the mold temperature can be controlled in 40 ~ 50X:; The mold temperature can be controlled in 60 ~ 70C for the products with high surface and performance requirements. And the mold temperature should be uniform, the temperature difference between the mold cavity and the mold core should not exceed 10 for deep hole products or more complex products, the mold cavity temperature is slightly higher than the mold core temperature, to facilitate the smooth demoulding of products.

3 injection pressure: compared with polyethylene, polystyrene, nylon and other plastic ABS cosmetic tube liquidity is slightly worse, so the required injection pressure is larger. However, too much injection pressure is easy to cause demoulding difficulty or demoulding damage, and may also bring larger internal stress to the product. The injection pressure of ABS cosmetic tube is not only related to the wall thickness and equipment type of products, but also related to the grade of resin. For thin-wall, long flow and small gate products, the injection pressure is required to be high, up to 130 ~ 150MPa, and thick wall products with large gate · 15·# 70-LoOMPA is ok. In the actual production process, the screw injection machine often chooses the injection pressure below lOOMPa, (we use 50 ~ 70MPa), and the plunger injection machine is generally above lOOMPa. Holding pressure should not be too high, the use of screw injection machine generally uses 30 ~ 50MPa, and the plunger type needs more than 60 ~ 70MPa. If the holding pressure is too high, it will increase the internal stress of the product.

4. Injection speed. Injection speed has a certain effect on the change of liquidity of ABS cosmetics tube. If the injection speed is slow, the appearance of products will appear ripple, poor fusion and other phenomena; If the injection speed is fast, it can make the mold filling quickly, but it is easy to appear poor exhaust, poor apparent roughness and other conditions, but also make the tensile strength and elongation of the product decreased, so that the coating adhesion force is also reduced because of the injection speed is too fast. Therefore, in the production process, in addition to the mold filling difficulties necessary to use a higher injection speed, generally choose medium and low connectivity is appropriate.

Matters needing attention

1. Start and stop for flame retardant ABS cosmetic tube in order to prevent the decomposition of flame retardant, there are strict requirements. In the boot inch, the barrel should be cleaned with general ABS cosmetic tube, and then processed. Before stopping the machine (refers to stopping for more than 20 minutes), on the one hand, the temperature of the cylinder shall be reduced to below 100℃, on the other hand, the material in the cylinder shall be emptied, and the cylinder can be stopped after cleaning with the general grade ABS cosmetic tube. The purpose is to make the flame retardant ABS cosmetic tube does not decompose.

2. The use of recycled material for one or two thousand net, no impurities, no decomposition of the ABS cosmetics tube recycled material, can be crushed directly after use, can also be mixed with the new material, the proportion of the mixture is generally not more than 25% of the new material, so as not to affect the performance. For the number of regeneration more than 5 times or add colorant recycled material, generally not mixed with new material, mainly to prevent color difference. Whether the recycled material is used alone or mixed with new material, it must be dried according to the provisions before it can be put into molding processing.

post-processing

For the use of more demanding ABS cosmetics tube products, in order to eliminate or reduce internal stress, the products must be put into the temperature of 70 ~ 80C hot air circulation drying box, processing 2 ~ 4 hours, slowly cooling to room temperature. As with other plastics ABS cosmetics tube products are also caused by various factors of internal stress (its size can be determined according to whether cracking and the length of cracking time of the parts immersed in glacial acetic acid solution). However, stress cracking rarely occurs under normal conditions. For this reason, ABS cosmetic tube products can usually be put into use without post-treatment.

Performance testing

Plastic performance testing technology services throughout the chemical industry, from raw material identification, chemical product formula analysis, to the production of industrial problems diagnosis, product application link failure analysis, product reliability testing, can provide the most professional analysis technology services. ABS cosmetics tube resin set of three monomer excellent properties, namely: styrene gloss, electrical properties, molding; Acrylonitrile heat resistance, rigidity, oil resistance; Impact resistance of butadiene.

Plastic ABS cosmetic tube performance testing should pay attention to:

General performance:

ABS cosmetics tube appearance is opaque ivory grain, non-toxic, tasteless, low water absorption products can be a variety of colors, and has 90% of the high gloss. ABS cosmetic tube combines well with other materials for easy surface printing, coating and plating. ABS cosmetics tube has an oxygen index of 18.2, is a flammable polymer, flame yellow, black smoke, charred but not dripping, and emits a distinctive cinnamon smell.

ABS cosmetic tube is a kind of resin with very good comprehensive performance. It has high impact strength and surface hardness in a relatively wide temperature range, high thermal deformation temperature than PA and PVC, and good dimensional stability.

ABS cosmetic tube melt has better fluidity than PVC and PC, but worse than PE, PA and PS, similar to POM and HIPS. The flow characteristics of ABS cosmetics tube belong to non-Newtonian fluid, and its melt viscosity is related to processing temperature and shear rate, but it is more sensitive to shear rate.

2. Mechanical properties

ABS cosmetic tube has excellent mechanical properties, its impact strength is excellent, can be used at very low temperatures. Even if ABS cosmetics tube products are damaged, it can only be tensile damage and not impact damage. ABS cosmetic tube has excellent wear resistance, good dimensional stability, and oil resistance, which can be used for bearings under medium load and speed. The creep of ABS cosmetic tube is larger than PSF and PC, but smaller than PA and POM. ABS cosmetics tube bending strength and compression strength is poor in plastics. The mechanical properties of ABS cosmetic tube are greatly affected by temperature.

3, thermal performance

ABS cosmetics tube belongs to amorphous polymer, no obvious melting point; Melt viscosity is high, liquidity is poor, weather resistance is poor, ultraviolet light can make color; The thermal deformation temperature is 70-107℃(about 85 ℃), and the product can be increased by about 10℃ after annealing. It is sensitive to temperature and shear rate. ABS cosmetic tube can still show some toughness at -40℃ and can be used for a long time in the temperature range of -40℃ to 85℃.

4. Electrical performance

ABS Cosmetics tube is electrically insulated and is almost impervious to temperature, humidity and frequency, making it suitable for use in most environments.

5. Environmental performance

ABS cosmetics tube is not affected by water, inorganic salts, alkali-alcohols and hydrocarbon solvents and a variety of acids, but soluble in ketones, aldehydes and chlorinated hydrocarbons, by acetic acid, vegetable oil erosion will produce stress cracking.

Performance testing is to test various performance indicators of the system by using automated testing tools to simulate various normal, peak and abnormal load conditions.

Raw materials :1, 3-butadiene; Styrene; acrylonitrile

Production method :ABS cosmetics tube production method is divided into mixing method and grafting method. Nowadays, most of the world's major manufacturers adopt the method of grafting and mixing first, which is divided into emulsion grafting - emulsion SAN mixing method, emulsion grafting - suspension SAN mixing method, emulsion grafting - body SAN mixing method. The emerging ontology grafting method has great advantages both in terms of production cost and impact on environment, which is the focus of future research.

Classification:

ABS cosmetic tube according to the impact strength can be divided into: ultra high impact resistance, high impact resistance, impact resistance and other varieties;

ABS cosmetic tube according to the molding process of the difference, and can be divided into: injection, extrusion, calendering, vacuum, blow molding and other varieties;

According to the characteristics of use and performance, ABS cosmetic tube can also be divided into: general grade, heat resistant grade, electroplating grade, flame retardant grade, transparent grade, antistatic, extrusion plate grade, tube grade and other varieties.