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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

Inactive Publication Date: 2012-07-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this modifier is used, the thermoplastic processing of polyvinyl alcohol with an alcoholysis degree of 88% must be achieved under the conditions of a special screw design and an external film-forming modifier. 99% polyvinyl alcohol plasticized
Judging from the effects of the above literature reports, these organic plasticizers have limited plasticizing efficiency to polyvinyl alcohol. When the amount added is low, the polyvinyl alcohol cannot be completely plasticized. When the amount of plasticizer is increased, the modification The effect tends to slow down, and the compatibility of these plasticizers with polyvinyl alcohol is limited, and there are plasticizer migration and precipitation when the addition amount is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Dissolve 60 parts of magnesium chloride and 20 parts of polyethylene glycol with a number average molecular weight of 200 in 60 parts of water to form a solution, then add 100 parts of 1799 polyvinyl alcohol into 50 parts of the solution, and fully Swelling: drying the fully swollen polyvinyl alcohol at 60° C. to constant weight to obtain a plasticized modified polyvinyl alcohol material. Put the modified polyvinyl alcohol material into a single-screw extruder to extrude and granulate, and then perform injection molding on an injection molding machine. The temperature of each section of the single-screw extruder is 130, 170, 170, 140°C, and 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 had a melting point of 179°C and a thermal decomposition temperature of 269°C.

Embodiment 2

[0033] First, dissolve 67 parts of calcium chloride and 33 parts of glycerin in 70 parts of water to make a solution, then add 100 parts of 1799 polyvinyl alcohol into 30 parts of the solution, and fully swell at 30°C; the fully swollen polyvinyl alcohol Vinyl alcohol was dried to constant weight at 50°C to obtain a plasticized modified polyvinyl alcohol material. The modified polyvinyl alcohol material was put into a molding machine and pressed at 180° C. for 10 minutes under a pressure of 10 MPa.

[0034] The obtained plasticized modified polyvinyl alcohol material has a melting point of 166°C and a thermal decomposition temperature of 278°C.

Embodiment 3

[0036] First, dissolve 63 parts of magnesium chloride and 38 parts of glycerin in 60 parts of water to make a solution, then add 100 parts of 1799 polyvinyl alcohol to 40 parts of the solution, and fully swell at 40°C; the fully swollen polyvinyl alcohol Dry at 60°C until constant weight to obtain a plasticized modified polyvinyl alcohol material. Put the modified polyvinyl alcohol material into a single-screw extruder to extrude and granulate. The temperature of each section of the extruder is respectively: 130, 170, 170, 140° C., and the rotation speed is 30 r / 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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Abstract

The invention discloses a compounded plasticizer for thermoplastic processing, which is formed by mixing the components by weight percent: 50-80% of inorganic metal salt plasticizer and 20-50% of organic plasticizer. The invention also discloses a method for plasticizing polyvinyl alcohol using the above compounded plasticizer, which comprises the steps of dissolving 30-50 parts of the compounded plasticizer in 60-70 parts of water to form a solution, adding 100 parts of polyvinyl alcohol with alcoholysis degree higher than or equal to 88% into the solution, then fully swelling the polyving akohol at 20-60 DEG C, and finally drying fully swelled polyvinyl alcohol at 50-60 DEG C until constant weight is reached, so as to obtain the modified plasticizing polyvinyl alcohol to be processed into a product by a thermoplastic processing method. When the compounded plasticizer disclosed by the invention is used for modifying polyvinyl alcohol, the crystal structure of polyvinyl alcohol is damaged, the melting temperature of polyvinyl alcohol can be effectively reduced, thermoplastic processing of polyvinyl alcohol is realized, and the problem of product frangibility caused by phenomena of movement and precipitation of the plasticizer is avoided.

Description

technical field [0001] The invention belongs to the technical field of thermoplastic processing plasticizers for polymers containing a large number of hydroxyl groups and the use of the plasticizers to realize thermoplastic processing of polyvinyl alcohol, in particular to a composite plasticizer for thermoplastic processing A plasticizer and a method for plasticizing polyvinyl alcohol with it for thermoplastic processing of polyvinyl alcohol. Background technique [0002] As a water-soluble polymer material, polyvinyl alcohol is not only widely used in fiber, film, gel and other fields because of its good water solubility, film-forming property, adhesiveness, emulsification and barrier properties, but also Because it is a synthetic polymer material that can be completely biodegraded, its application range is further expanded. In addition, polyvinyl alcohol is also a polymer material that can be prepared through non-petroleum routes. Therefore, in today's increasingly scarc...

Claims

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Application Information

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IPC IPC(8): C08K3/16C08K3/30C08K3/28C08K5/21C08K5/20C08K5/17C08K5/053C08K5/06C08L71/08C08L29/04
Inventor 张熙江献财蒋婷夏超代华
Owner SICHUAN UNIV
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