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High-quality polyvinyl alcohol cast film and its preparation method and application

A polyvinyl alcohol flow, polyvinyl alcohol technology, which is applied to high-quality polyvinyl alcohol cast film and its preparation and application fields, can solve the problems of heavy acidity, difficult thermoplastic processing and the like

Active Publication Date: 2021-05-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the technical problems to be solved by the present invention is that the existing polyvinyl alcohol cast film is difficult to be thermoplastically processed and has the problem of heavy sour taste. To provide a new high-quality polyvinyl alcohol cast film, the cast film has the performance The good taste is also significantly reduced, and the haze and gloss of the film maintain a good advantage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] a) 75 parts of PVA (polymerization degree is 1700, alcoholysis degree is 88%), 20 parts of glycerin and 1% NaHCO 3 (Particle sizeg :28.3℃,T c :120.4℃, T m : 192.3°C. MFR: 1.8g / 10min (10kg, 190°C).

[0032] b) The light yellow TPVA pellets obtained in step a) are added to a single-screw extruder, and the temperatures of sections 1, 2, and 3 of the extruder and the die head are sequentially 190°C, 195°C, 195°C and 195°C, The rotation speed of the screw is 50 rpm, and the PVA pellets are plasticized, melted, extruded, conveyed by rollers, drawn, and wound to obtain a PVA cast film. Film thickness: 27□□m. The strengths of the films in MD and CD directions are 68MPa and 26MPa respectively, and the elongation in MD and CD directions are 108% and 624% respectively. The haze and gloss of the obtained film were 16% and 68% respectively, and the sour taste was obviously reduced.

Embodiment 2

[0034] a) 75 parts of PVA (polymerization degree is 1700, alcoholysis degree is 88%), 20 parts of glycerin and 4% NaHCO 3 (Particle sizeg :28.7℃,T c :119.4℃, T m : 195.0°C. MFR: 4.2g / 10min (10kg, 190°C).

[0035] b) The light yellow TPVA pellets obtained in step a) are added to a single-screw extruder, and the temperatures of sections 1, 2, and 3 of the extruder and the die head are sequentially 190°C, 195°C, 195°C and 195°C, The rotation speed of the screw is 50 rpm, and the PVA pellets are plasticized, melted, extruded, conveyed by rollers, drawn, and wound to obtain a PVA cast film. Film thickness: 26 m. The strengths of the films in MD and CD directions were 70MPa and 31MPa, respectively, and the elongations in MD and CD directions were 89% and 311%, respectively. The haze and gloss of the obtained film were 46% and 54% respectively, and almost no sour taste.

Embodiment 3

[0037] a) 75 parts of PVA (the degree of polymerization is 1700, the degree of alcoholysis is 88%), 20 parts of glycerol and 1% Na 2 SiO 3 (Particle sizeg :20.1℃,T c :111.0℃, T m : 162.5°C. MFR: 1.1g / 10min (10kg, 190°C).

[0038] b) The light yellow TPVA pellets obtained in step a) are added to a single-screw extruder, and the temperatures of sections 1, 2, and 3 of the extruder and the die head are sequentially 190°C, 195°C, 195°C and 195°C, The rotation speed of the screw is 50 rpm, and the PVA pellets are plasticized, melted, extruded, conveyed by rollers, drawn, and wound to obtain a PVA cast film. Film thickness: 31□□m. The strengths of the films in MD and CD directions are 66MPa and 25MPa respectively, and the elongation rates in MD and CD directions are 80% and 206% respectively. The haze and gloss of the obtained film were 7% and 79% respectively, the surface of the film was smooth, and the sour taste was obviously reduced.

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Abstract

The invention relates to a high-quality polyvinyl alcohol casting film and a preparation method thereof, which mainly solves the problems in the prior art that the polyvinyl alcohol casting film is difficult to be prepared by thermoplastic processing and has a strong sour taste. The present invention adopts a preparation method of polyvinyl alcohol casting film, comprising the following steps: a) adding a certain amount of polyvinyl alcohol, plasticizer and strong base and weak acid salt into a twin-screw extruder at the same time for melting Processing and extruding to obtain thermally plasticized polyvinyl alcohol particles; b) adding the polyvinyl alcohol particles obtained in step a) to a single-screw extruder for melting to prepare a polyvinyl alcohol cast film; the strong base and weak acid salt The strong base ion is Na + 、K + , Li + , or Al 3+ One or more of them, the weak acid ion is CO 3 2‑ 、HCO 3 ‑ 、H 2 PO 4 ‑ 、HPO 4 2‑ One or two or more of the technical schemes can better solve this problem and can be used in the industrial production of high-quality polyvinyl alcohol cast film.

Description

technical field [0001] The invention relates to a high-quality polyvinyl alcohol cast film, a preparation method and application thereof. The technical route is divided into two steps. First, polyvinyl alcohol, plasticizer and strong base and weak acid salt are simultaneously added to the twin-screw extruder for melt processing and extrusion to obtain thermally plasticized polyvinyl alcohol particles; The obtained heat-plasticized polyvinyl alcohol particles are fed into a single-screw extruder to melt to prepare a polyvinyl alcohol cast film. This method not only better solves the sour taste of the polyvinyl alcohol film, but also has better transparency and can be applied to industrial production. 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 corrosion resistance. The PVA film prepared by it can be widely used in the pac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08K5/053C08K3/32C08K3/26C08K3/34C08J5/18
CPCC08J5/18C08J2329/04C08K3/26C08K3/32C08K3/34C08K5/053C08K2003/262C08K2003/324C08K2201/003C08L29/04
Inventor 王洪学肖田鹏飞严丽丽
Owner CHINA PETROLEUM & CHEM CORP
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