The four features of cosmetics bottles - Shangyu city hengtong plastic products co. , LTD

Cosmetics bottles, acrylic） Also known as organic glass, has many special features of this material, is widely used due to these features! 1, the mechanical properties of organic glass has good comprehensive mechanical properties, in the front rank in the general plastic, tensile, bending and compression strength are higher than that of polyolefin, also higher than that of polystyrene, polyvinyl chloride (PVC), etc. , poor impact toughness, but also a little is better than that of PS. Casting bulk polymerization of methyl methacrylate plate ( Such as aviation organic glass plate) Have higher mechanical properties such as tensile, bending, compression, can achieve the level of polyamide, polycarbonate engineering plastics. In general, the tensile strength of the PMMA can reach 50 - 77 mpa, bending strength can reach 90 - 130 mpa, the performance data of the upper limit has reached even more than some engineering plastics. The elongation at break is only 2% 3%, the mechanics performance characteristics is basically hard and brittle plastic, with notch sensitivity, easy cracking under stress, but when fault fracture not as sharp as PS and common inorganic glass is uneven. 40 ℃ is a secondary transition temperature, the temperature of the equivalent lateral methyl began to exercise, more than 40 ℃, the material toughness, ductility improvement. 2, heat resistant cosmetic plastic material heat resistance is not high, although its glass transition temperature of 104 ℃, but * continuous use temperature on different working conditions at 65 ℃ Change between 95 ℃ and the thermal deformation temperature is about 96 ℃ ( 1. 18MPa） 。 Can use monomers and allyl methacrylate or double ester base of ethylene glycol acrylate copolymerization method to improve heat resistance. Cold resistance is poor, the embrittlement temperature of about 9. 2℃。 Poly (methyl methacrylate (mma) belongs to the medium, the thermal stability of better than PVC and polyformaldehyde, but not as good as polyolefin and polystyrene, thermal decomposition temperature slightly higher than 270 ℃, the flow temperature is about 160 ℃, the melting process of reason has wide temperature range. 3, resistance and solvent resistance of polymethyl methacrylate can be relatively dilute mineral acid, but strong inorganic acid can make its erosion, alkali kind, but warm, sodium hydroxide, potassium hydroxide, erosion can make it resistant to salt and fat, fat hydrocarbon, insoluble in water, methanol, glycerin, etc. , but can absorb alcohol swelling, and generate stress cracking, not resistant to ketones, chlorinated hydrocarbons and aromatic hydrocarbons. Its solubility parameters of about 18. 8 ( J/CM3) 1/2, can dissolve in many chlorinated hydrocarbons and aromatic hydrocarbons, such as ethylene dichloride, trichloroethylene, chloroform, toluene, acetic acid ethylene and acetone can also make it dissolved. 4, fire-resistant and weathering polymethyl methacrylate is easy to burn, limited oxygen index only 17. 3. Polymethyl methacrylate has excellent weathering resistance, the sample after 4 years of natural aging test, weight changes, the tensile strength and light transmittance declined slightly, slightly yellow color and crazing resistance decreased obviously, the impact strength also increased slightly, other physical properties of little change.