Melting processing method for polyvinyl alcohol composite material

A polyvinyl alcohol, melt processing technology, applied in the processing field of polyvinyl alcohol composite materials, can solve the problem of not meeting the thermal stability requirements of polyvinyl alcohol melt processing, affecting the stability and structure of blown film processing, and using water as a plasticizer Poor thermal stability and other problems, to achieve obvious plasticizing effect, good appearance, and good fluidity

Inactive Publication Date: 2014-03-12
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, JP77110782, the melt processing technology of polyvinyl alcohol, reports a method of plasticizing with water, but the thermal stability of water as a plasticizer is poor, and bubbles are easily generated during processing.
CN1368515 discloses the use of amide small molecules as plasticizers, combined with water to carry out composite plasticization of polyvinyl alcohol, which improves the thermal stability of water during processing, but the combination of water and amide substances still cannot meet the requirements of polyvinyl alcohol. Thermal Stability Requirements for Alcohol Melt Processing
CN10186413A discloses that polyvinyl alcohol is plasticized with small molecules and polymer plasticizers to achieve blown film formation, but the addition of auxiliary agents and fillers affects the processing stability and structure of the blown film, and its processing technology also needs to be improved
Others use glycerin as a plasticizer, but when glycerin plasticizes polyvinyl alcohol, the color of the product will become dark, and the plasticizer will easily precipitate out after long-term storage, making the product brittle, and the product is susceptible to precipitation. pollution

Method used

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  • Melting processing method for polyvinyl alcohol composite material
  • Melting processing method for polyvinyl alcohol composite material
  • Melting processing method for polyvinyl alcohol composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Mix 70 parts by mass of PVA1788 and 30 parts by mass of PVA0588 in a high-speed mixer at 70-100°C for 5 minutes, then add 20 parts by mass of dihydroxyacetone and mix at 80-120°C for 10 minutes, then add 5 parts by mass of glycerin and 0.5 parts by mass of liquid paraffin, mixed in a high-speed mixer at 70-85 ° C for 10-20 minutes, cooled to room temperature, extruded and pelletized in a twin-screw extruder, the barrel temperature is 130-200 ° C, the screw speed 110 rpm. The extruded pellets are injection-molded in an injection machine, the injection temperature is 170-190° C., and the injection pressure is 60-90 MPa. The measured tensile strength of the PVA composite sample was 28MPa, and the elongation at break was 450%.

Embodiment 2

[0025] Mix 70 parts by mass of PVA1788 and 30 parts by mass of PVA0588 in a high-speed mixer at 70-95°C for 5 minutes at high speed, then add 5 parts by mass of glycerin and 15 parts of 2-hydroxyacetamide and mix in a high-speed mixer at 70-120°C After 10-20 minutes, add 5 parts by mass of dihydroxyacetone and 1 part by mass of liquid paraffin and mix in a high-speed mixer at 60-85° C. for 10 minutes at high speed. The mixture is extruded and granulated in a twin-screw extruder, the barrel temperature is 130-200° C., and the screw speed is 150 rpm. Finally, the pellets are injection-molded in an injection machine, the injection temperature is 170-190° C., and the injection pressure is 60-90 MPa. The measured tensile strength of the PVA composite sample is 29.8MPa, and the elongation is 380%.

Embodiment 3

[0027] Mix 60 parts by mass of PVA1788 and 40 parts by mass of PVA0588 in a high-speed mixer at 70-95°C for 5 minutes, then add 20 parts by mass of dihydroxyacetone and mix in a high-speed mixer at 90-110°C for 10 minutes. Then add 5 parts by mass of 2-hydroxyacetamide, 0.5 parts by mass of dimethyl silicone oil and mix at 70-115°C for 10-15 minutes, cool to room temperature and extrude into pellets in a twin-screw extruder, the barrel temperature is 130- 200°C, the screw speed is 130 rpm. Finally, the pellets are injection-molded in an injection machine, the injection temperature is 170-190° C., and the injection pressure is 60-90 MPa. The measured tensile strength of the PVA composite sample is 27.9MPa, and the elongation is 450%.

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Abstract

The invention discloses a melting processing method for a polyvinyl alcohol composite material. The method comprises the following steps of: uniformly mixing polyvinyl alcohol at the temperature of 70-100 DEG C to obtain a mixture; uniformly mixing 100 parts by mass of the mixture, 10-30 parts by mass of a small molecular composite plasticizing agent and 0.5-5 parts by mass of an aid at the temperature of 70-120 DEG C, and cooling to the room temperature; and adding into a double screw extruder for extruding and pelletizing. By reasonably selecting a composite system of the small molecular plasticizing agent and adding an appropriate amount of aid, thermoplastic processing and molding of polyvinyl alcohol are realized successfully. According to the method, the problem of melting processing of polyvinyl alcohol is solved, and the processing property, physical property, appearance and the like of the composite material are improved.

Description

1. Technical field [0001] The invention relates to a processing method of polyvinyl alcohol composite material, in particular to a melting processing method of polyvinyl alcohol composite material. 2. Background technology [0002] Traditional polymer synthesis basically comes from petroleum routes, and the gradual scarcity of petroleum resources will greatly affect the development space of traditional polymers. Polyvinyl alcohol is obtained by synthesizing vinyl acetate from alkyne with calcium carbide and then polymerizing alcoholysis. It takes a non-petroleum route and has broad development prospects. At present, my country's polyvinyl alcohol production is increasing year by year, maintaining a growth rate of 8-10%, with rich sources and low prices. [0003] Polyvinyl alcohol is a biodegradable polymer with high barrier properties, antistatic properties, wear resistance and corrosion resistance, and excellent mechanical properties. However, the molecular chain of polyv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08L83/04C08K5/07C08K5/053C08K5/20C08K5/01B29B9/06B29C47/92B29C48/92
CPCB29C48/04B29C48/40B29C48/92B29C2948/92704B29C2948/92895
Inventor 徐卫兵王雷陈俊伟周正发汪瑾
Owner HEFEI UNIV OF TECH
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