Compounded plasticizer for thermoplastic processing and method for plasticizing polyvinyl alcohol
A technology for compounding plasticizers and polyvinyl alcohol, which is applied in the field of compounding plasticizers and plasticizing polyvinyl alcohol, and can solve the problem of limited plasticizing efficiency of polyvinyl alcohol, limited compatibility of polyvinyl alcohol, and inability to produce polyvinyl alcohol Alcohol plasticization and other problems, to achieve the effect of low cost, wide application range, and lower melting temperature
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[0029] Example 1
[0030] First, 60 parts of magnesium chloride and 20 parts of polyethylene glycol with a number average molecular weight of 200 are dissolved in 60 parts of water to make a solution, and then 100 parts of 1799 polyvinyl alcohol are added to 50 parts of the solution, and the solution is fully heated at 20°C. Swelling; drying the fully swollen polyvinyl alcohol at 60°C to a constant weight to obtain a plasticized modified polyvinyl alcohol material. After putting the modified polyvinyl alcohol material into a single-screw extruder to be extruded and pelletized, the product is injection molded on the injection molding machine. The temperature in each section of the single-screw extruder is 130, 170, 170, 140°C, the speed is 30r / min; the injection molding process parameters are 180°C, the mold temperature is 30°C, and the injection pressure is 80MPa.
[0031] The obtained plasticized modified polyvinyl alcohol material has a melting point of 179°C and a thermal decom...
Example Embodiment
[0032] Example 2
[0033] First, 67 parts of calcium chloride and 33 parts of glycerin are dissolved in 70 parts of water to make a solution, and then 100 parts of 1799 polyvinyl alcohol are added to 30 parts of this solution, and the fully swollen polyvinyl alcohol is fully swelled at 30°C. The vinyl alcohol is dried at 50°C to a constant weight to obtain a plasticized modified polyvinyl alcohol material. The modified polyvinyl alcohol material is put into a molding machine and pressed into a plate at 180° C. under a pressure of 10 MPa, and the pressing time is 10 minutes.
[0034] The obtained plasticized modified polyvinyl alcohol material has a melting point of 166°C and a thermal decomposition temperature of 278°C.
Example Embodiment
[0035] Example 3
[0036] First, 63 parts of magnesium chloride and 38 parts of glycerin are dissolved in 60 parts of water to make a solution, and then 100 parts of 1799 polyvinyl alcohol are added to 40 parts of the solution, and the fully swollen polyvinyl alcohol is fully swelled at 40°C. Dry at 60°C to constant weight to obtain a plasticized modified polyvinyl alcohol material. The modified polyvinyl alcohol material was put into a single-screw extruder for extruding and granulation. The temperature of each section of the extruder was 130, 170, 170, and 140°C, and the rotation speed was 30r / min.
[0037] The obtained plasticized modified polyvinyl alcohol material has a melting point of 168°C and a thermal decomposition temperature of 274°C.
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