The main raw material of PVC gloves is polyvinyl chloride (PVC) resin, which is polymerized from vinyl chloride monomer (CH2 = chc1), with an average molecular weight of 50000-150000 and a linear polymer structure. According to the polymerization process, they are divided into suspension polymerization resin and emulsion polymerization resin (paste resin).
Paste resin is used to produce PVC gloves. The average degree of polymerization is 1200-1800, the particle diameter is less than 50 microns, the industrial product is white or light yellow powder, the relative density is 1.4, the chlorine content is 56-58%, and the low molecular weight is easily soluble in ketones, esters and chlorinated hydrocarbon solvents. It has excellent chemical resistance. The thermal stability of PVC resin is poor, and it begins to decompose above 110 ℃, the color turns yellow and hydrogen chloride is released at the same time.
PVC resin with plasticizer, stabilizer and other additives to prepare paste, with low viscosity, good stability, excellent defoaming performance and other characteristics, is the main raw material for the production of PVC gloves.
DOP bis (2-ethyl) hexyl phthalate, also known as dioctyl phthalate: it is esterified by phthalic anhydride and 2-ethyl hexol. Molecular weight 391. It is colorless or light yellow, odorless, oil-free transparent liquid with density of 0.986g/cm3 (25 ℃), melting point of -53 ℃ and boiling point of 386 ℃. It is insoluble in water, and easy to dissolve in ether, ethanol, mineral oil, etc. It is a good plasticizer for PVC. It is non-toxic and can be used in the production of packaging materials in contact with food. Can burn. Mild irritation to eyes. DOP is the most widely used plasticizer in plastic molding. It has good solubility with many polymers, high plasticizing efficiency, low volatility, water-resistant extraction, good low gentle smoothness, and has ideal comprehensive properties, and is often called standard plasticizer. It is widely used in soft PVC products.
DOA (DI (2-ethyl) hexyl adipate, also known as dioctyl adipate): from adipic acid and octanol esterification. The molecular weight is 371. Colorless, odorless liquid. The boiling point is 208-218 ℃, the melting point is – 75 ℃, the relative density is 0.927, and the viscosity (20 ℃) is 13.7 MPa. S. Its chemical properties are relatively stable. The solubility in water is below 0.01%. It is easily soluble in organic solvents such as alcohol, ether, ketone and benzene. It is an excellent cold resistant plasticizer for PVC, and has certain photothermal stability. It is flammable and belongs to slight toxicity. The main function is to keep the product performance stable when the temperature changes. The dosage of DOA in PVC gloves varied with seasons. Due to the fact that the enterprise did not necessarily use DOA in the production during the production investigation, the DOA was not included in the formulation of unit consumption.
Calcium zinc stabilizer: light yellow liquid with specific gravity of 0.94. It is based on calcium zinc carboxylate and prepared with epoxy soybean oil as solvent. It has low volatility, non-toxic and tasteless. It meets the requirements of commercial medicine.
Txib (2,2,4-trimethyl-1,3-pentanediol diisobutyrate): English Name: 2,2,4-trimethyl-1,3-pentanediol dibutyrate, the molecular formula is c16h30o4, the molecular weight is 286. It is a colorless liquid with vaporization temperature of 424 ℃ and stable chemical properties. It is not easy to mix bubbles into the solution and can keep the product smooth and beautiful. It is a viscosity reducer with plasticizing effect and low volatility, which can give the product good cold resistance and water resistance.
Epoxidized soybean oil (ESO): the product is prepared from edible soybean oil by oxidation, non-toxic, and is widely used as epoxy plasticizer and stabilizer. It can increase the brightness and softness of PVC soft products. It has excellent heat and light resistance, good compatibility, low volatility and good extraction resistance.
Water solution of polyurethane (PU treatment agent for short): the product is used for the processing and production of powder free gloves, and can be diluted 3-8 times with water.
Domestic viscosity reducer: This product is colorless transparent liquid with specific gravity of 0.74, low viscosity and high volatility. It is 100% volatile in the processing of PVC gloves. Its main function is to adjust the viscosity of PVC mixture to meet the requirements of production process.
Hope this article can help new manufacturer to choose the right material when starting to produce disposable PVC gloves.