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Sour taste-free polyvinyl alcohol composition, cast film and preparation method of cast film

A technology of polyvinyl alcohol flow and polyvinyl alcohol, which is applied in the field of preparation of non-acid polyvinyl alcohol casting film, can solve the problems of high equipment conditions, efficiency and production cost, and achieve superior performance, light sour taste and high tensile strength Effect

Active Publication Date: 2019-03-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method equipment condition, efficiency and production cost are all higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]a) 75 parts of PVA (the degree of polymerization is 1700, the degree of alcoholysis is 88%), 25 parts of glycerin and 1% zeolite are added to the twin-screw extruder at the same time, and the temperatures of the 1st to 9th sections of the extruder and the die are respectively 160°C, 170°C, 180°C, 180°C, 180°C, 180°C, 180°C, 180°C, 180°C and 170°C, and the screw speed is 250rpm. After the extruded strip is cooled, it is granulated by a pelletizer to obtain light yellow thermoplastic TPVA pellets. The resulting TPVA particle T g : 61.2°C, T c : 100.8°C, T m : 154.7°C.

[0038] b) Add the light yellow thermoplastic PVA pellets obtained from step a) into the single-screw extruder, and the temperatures of the first, second, and third sections of the extruder and the die are sequentially 190°C, 195°C, 195°C and 195°C , the screw speed is 20rpm, the PVA pellets are plasticized, melted, extruded, roller conveyed and drawn, and wound to obtain a PVA cast film. The strengths ...

Embodiment 2

[0040] a) 75 parts of PVA (the degree of polymerization is 1700, the degree of alcoholysis is 88%), 25 parts of glycerin and 2% zeolite are added to the twin-screw extruder at the same time, and the temperatures of the 1st to 9th sections of the extruder and the die are respectively 160°C, 170°C, 180°C, 180°C, 180°C, 180°C, 185°C, 183°C, 180°C and 170°C, and the screw speed is 250rpm. After the extruded strip is cooled, it is granulated by a pelletizer to obtain light yellow thermoplastic PVA pellets. The resulting TPVA particle T g : 60.8°C, T c : 97.8°C, T m : 154.1°C.

[0041] b) Add the light yellow thermoplastic PVA pellets obtained from step a) into the single-screw extruder, and the temperatures of the first, second, and third sections of the extruder and the die are sequentially 190°C, 195°C, 195°C and 195°C , the screw speed is 20rpm, the PVA pellets are plasticized, melted, extruded, roller conveyed and drawn, and wound to obtain a PVA cast film. The strengths o...

Embodiment 3

[0043] a) 75 parts of PVA (the degree of polymerization is 1700, the degree of alcoholysis is 88%), 25 parts of glycerin and 3% zeolite are added to the twin-screw extruder at the same time, and the temperatures of the 1st to 9th sections of the extruder and the die are respectively 160°C, 170°C, 180°C, 180°C, 185°C, 185°C, 186°C, 190°C, 180°C and 170°C, and the screw speed is 250rpm. After the extruded strip is cooled, it is granulated by a pelletizer to obtain light yellow thermoplastic PVA pellets. The resulting TPVA particle T g : 63.1°C, T c : 99.0°C, T m : 152.9°C.

[0044] b) Add the light yellow thermoplastic PVA pellets obtained from step a) into the single-screw extruder, and the temperatures of the first, second, and third sections of the extruder and the die are sequentially 190°C, 195°C, 195°C and 195°C , the screw speed is 20rpm, the PVA pellets are plasticized, melted, extruded, roller conveyed and drawn, and wound to obtain a PVA cast film. The elongation ...

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Abstract

The invention relates to a preparation method of a sour taste-free polyvinyl alcohol cast film, and mainly solves the problems that the polyvinyl alcohol cast film in the prior art is difficult to prepare through thermoplastic processing and has a heavy sour taste. A sour taste-free polyvinyl alcohol composition comprises the following components in parts by mass: a), 50-90 parts of polyvinyl alcohol; b), 10-50 parts of a plasticizer; the sour taste-free polyvinyl alcohol cast film is characterized by further comprising an adsorbent, and counted by the polyvinyl alcohol, the weight percentagecontent of the adsorbent is 0.5-10%. Through adoption of a technical scheme, the problem of the sour taste of the polyvinyl alcohol cast film is solved better; according to the preparation method, a technology is simple, the production cost is low and the operation is convenient; the preparation method can be applied to industrial production of the polyvinyl alcohol cast film.

Description

technical field [0001] The invention relates to a method for preparing a non-sour polyvinyl alcohol cast film. The invention mainly solves the problems in the prior art that the polyvinyl alcohol cast film is difficult to be prepared by thermoplastic processing and has a heavy sour taste. The preparation method of the present invention mainly includes two steps, adding polyvinyl alcohol, a plasticizer and an adsorbent to an extruder at the same time for melting and thermoplastic processing to obtain plasticized polyvinyl alcohol pellets; Vinyl alcohol pellets were prepared into polyvinyl alcohol cast film. The invention not only better solves the sour taste problem of polyvinyl alcohol casting film, but also has simple process, convenient operation and easy application. Background technique [0002] Polyvinyl alcohol (PVA or PVOH for short) is a water-soluble polymer with excellent oxygen barrier properties, oil barrier properties, abrasion resistance, and chemical corrosio...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08K5/053C08K7/26C08K3/34C08K3/36C08J5/18
CPCC08J5/18C08J2329/04C08K3/34C08K3/36C08K5/053C08K7/26C08L2203/16C08L29/04
Inventor 王洪学肖田鹏飞严丽丽
Owner CHINA PETROLEUM & CHEM CORP
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