Polyvinyl alcohol for plastic sheet
DATE：2021/4/29 8:39:50 / READ： / SOURCE：This station
Polyvinyl alcohol for plastic sheet
Plastic sheet production line www.handern.com
① When the alcoholysis degree of PVAL is below 88%, it is 20 & apos; When the alcoholysis degree is 97%, it is dissolved in 40 ~ 60C water, and when the alcoholysis degree is more than 98%, it is dissolved in 80C water. PVAL contains a large number of hydroxyl groups with strong hydrophilicity, so it has excellent moisture permeability and strong hygroscopicity;
② PVAL can be crystallized by drying and heat treatment, and has a certain water resistance, the heat treatment temperature can not be changed.
③ PVA film has good gas resistance, which is better than PVDC, but its moisture resistance is not good. The use temperature of PVA film should not exceed 1C PVA film has good transparency; Weak acid, weak base and oil can be eroded by solvent. Not resistant to ketones, aromatics, aliphatic hydrocarbons and chlorinated hydrocarbons: 8. It has good low temperature resistance, good toughness even at - 40C, and little decrease in strength;
MBS can be used for injection molding and extrusion molding. Mainly used in toys, battery shell, electrical components, stationery. It can be used in the production of transparent bottles, inserts, cans, thermoforming sheets, MBS, anti impact agent in transparent PVC products and good processing aids. Plastic sheet production line www.handern.com
Polyvinylidene chloride (PVDC) is an important high barrier packaging material with the trademark of "saran" produced by Dow Chemical Company in 1940. Because the homopolymer of PVDC has poor compatibility with plasticizer and stabilizer, and PVDC and PVC are heat sensitive plastics, its homopolymer has no practical value. At present, PVDC is copolymerized with vinyl chloride, acrylate and so on. Usually, the content of VDC monomer in the copolymer is more than 75%. one thousand nine hundred and forty-two In the Second World War, Germany used the copolymer of PVDC and vinyl chloride to produce shrink film, package guns and ammunition, and use its high barrier property to prevent moisture and rust. In food, it is first used to package sausages and meat. The copolymer can be processed by adding stabilizer, plasticizer and other additives like PVC. The content of VDC monomer should be less than 1pl / L. ② PVDC has excellent gas and moisture resistance, and it is a high barrier material with good transparency. The copolymer of vinylidene and acrylate is often used as anti rent material. 2~ This kind of coating is called K coating. PVDC of molding grade is a copolymer of PVDC and vinyl chloride; ③ PVDC has good resistance to oil and chemicals, bacteria and insects: the operating temperature of opvdc is - 40 ~ 75c; It should be noted that ipvtc is not resistant to concentrated sulfuric acid, concentrated nitric acid, concentrated caustic solvents, ammonia and oxygenated hydrocarbon solvents. It can dissolve in tetrahydrofuran and swell in cyclohexanone at room temperature. Colorless and transparent, transparent with as, PC equivalent, non-toxic: a high degree of rigidity, hardness, good dimensional stability: the amount of aluminum Valley ring Zhizhao Kaitian want to produce Zhongrong District, it has a high degree of heat resistance, the use temperature at 100C, heat class up to 1200: total dental to private professional workers
It can bear most easily inorganic acid, organic acid, weak breaking, salt, drunk, oil and grease, and can repeatedly bear the wine poison of Yanqi system. Not resistant to concentrated hydrochloric acid, concentrated nitric acid, strong alkali, benzene, gasoline, etc; SMA resin can be molded by extrusion, blow molding, injection, thermoforming and foaming. It is used for shallow tray, cup, dish and foam products for food, medicine packaging and thermoforming packaging. SMA / PC Blends can be widely used in heat-resistant food processing plates and cookers. Due to their high strength, toughness, heat resistance and easy processing, SMA / PC blends have been widely used in the production of daily necessities. FDA has approved that SMA / PC Blends can be used in food and drug packaging. Plastic sheet production line www.handern.com
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