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Polyvinyl alcohol hollow container preparation method

A polyvinyl alcohol, hollow technology, applied in the direction of hollow objects, applications, household appliances, etc., can solve the problems of difficult preparation of hollow containers, low decomposition temperature, etc., and achieve the effects of low cost, improved barrier performance, and convenient operation

Active Publication Date: 2009-10-28
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because polyvinyl alcohol is a crystalline polymer with a large number of hydroxyl groups in the molecule, which can form a large number of intramolecular and intermolecular hydrogen bonds, making its melting point as high as 220-240 ° C, but the decomposition temperature is low, and dehydration begins at 160 ° C. Chemical, starting to decompose at 200°C, and decomposes immediately during the melting process, no thermoplastic processing window, difficult to prepare hollow containers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0023] 1. Dissolve 1 kg of ethylene glycol and 0.1 kg of aminocaproic acid in 20 kg of deionized water, mix to form a uniform solution, then add 50 kg of polyvinyl alcohol with a degree of polymerization of 1750 and a degree of alcoholysis of 99 mol%, and stir at a temperature of 20 Swell at °C. Melt and plasticize the extruded parison in an extruder at a temperature of 60-125°C, stretch it axially by 1.5, blow it into a container in a mold at a temperature of 10°C, and use a 5% organic titanate solution After cross-linking treatment at a temperature of 80° C. for 1 minute, heat treatment was performed at a temperature of 200° C. for 3 minutes.

[0024] 2. Dissolve 15kg of butanediol and 10kg of triethanolamine salt in 50kg of deionized water, mix to form a uniform solution, then add 80kg of polyvinyl alcohol with a degree of polymerization of 1700 and a degree of alcoholysis of 92mol%, and stir at a temperature of 60°C Swell, then add 3.5kg polyethylene wax, 1kg polyacrylate...

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PUM

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Abstract

The invention discloses a preparation method of a polyvinyl alcohol hollow container, which is characterized in that 1 to 25 parts of a modifying agent having a complementary structure with polyvinyl alcohol are dissolved in 20 to 50 parts of deionized water, stirred to form a uniform solution, and then 50 parts of ~80 parts of polyvinyl alcohol, fully swell at a temperature of 20~60°C, add 0~5 parts of auxiliary additives, mix evenly, and blow on the blow molding equipment at a thermoplastic processing temperature of 60~170°C and a mold temperature of 10~150°C Molded into a hollow container, then undergo heat treatment at a temperature of 40-250°C or infrared drying for 3-120 minutes to increase the crystallinity of the product, or cross-link with a cross-linking agent solution with a concentration of 0.1%-5% at a temperature of 20-80°C After 1 to 60 minutes, heat treatment or infrared drying is performed to obtain a polyvinyl alcohol hollow container with excellent barrier properties, mechanical properties and moisture resistance.

Description

technical field [0001] The invention relates to a polyvinyl alcohol hollow container and a preparation method thereof. More specifically, the invention relates to modifying polyvinyl alcohol with a modifier having a complementary structure to polyvinyl alcohol, and preparing a polyvinyl alcohol hollow container with excellent barrier performance by melt blow molding, which belongs to the field of polymer processing. Background technique [0002] Plastic containers have good mechanical properties, light weight, and are easy to process and shape, and are widely used in the production of hollow containers. However, most plastic containers have poor barrier properties to non-polar solvents. In order to improve their barrier properties, researches have been done both at home and abroad. Mixed material (CN1754908A); Sinopec Group Qilu Petrochemical Company Chen Yongfen etc. disclose a kind of polyethylene / ethylene-vinyl alcohol copolymer high barrier layered hollow container (CN ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C49/78B29C71/02B29C71/04B29C71/00C08L27/06C08K5/3492B29L22/00C08L3/02C08L1/00C08L33/08C08L71/00C08L33/26C08K3/00C08K5/205C08K5/00
Inventor 王琪李莉杨芳熊宪辉
Owner SICHUAN UNIV
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