Low melting point polyvinyl alcohol and preparation method thereof

A technology of polyvinyl alcohol and low melting point, which is applied in the field of low melting point polyvinyl alcohol and its preparation, can solve the problems of reduced biodegradability of PVA products, reduced environmental performance, and non-compliance with market demand, so as to improve processability and ash content The effect of low cost and short process

Active Publication Date: 2021-10-26
TIANJIN SUNNYMER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existence of a large number of additives reduces the biodegradability and environmental performance of PVA products, which does not meet market demand.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: add glass condenser to a tool 1500ml stirred glass reaction bottle and cool with the water below 20 ° C, put in the jacket of controllable temperature rise, add 100g vinyl acetate, vinyl diethylene glycol base ether 0.05g (0.05%), 0.04g of azobisisoheptanonitrile as the initiator, start the stirring, pass in nitrogen to replace the air, heat the reaction bottle, and raise the temperature to 56°C to start timing the polymerization reaction, and when the reaction reaches 80 minutes, pass the injection The pump injects 100 g of methanol solution containing 0.14 g of 1,4-butynediol for 5.5 hours and terminates after a total reaction time of 11 hours. After the polymerization was finished, 50 g of methanol was added and the temperature was raised to 90°C to evaporate for 2.5 hours to recover residual monomers.

[0034] To test the solid content of the polymer, add methanol to adjust the content to 25wt%, weigh 200g of the polymer solution, add it to a 1500ml st...

Embodiment 2

[0043]Embodiment 2: add glass condenser to a 1500ml tool stirred glass reaction bottle and cool with the water below 20 ° C, put in the controllable temperature rise jacket, add 100g vinyl acetate, triethylene glycol divinyl ether 0.05g, 0.1g 97.0% tert-butyl peroxyneodecanoate as the initiator, start the stirring, pass in nitrogen to replace the air, heat the reaction bottle, and raise the temperature to 60°C to start timing the polymerization reaction, and when the reaction reaches 50 minutes, inject The pump injects 100 g of a methanol solution containing 0.12 g of trimethylbutenediol, the injection time is 4.5 hours, and the total reaction time is 9 hours before termination. After the polymerization is finished, add 50 g of methanol and heat up to 80-90°C to evaporate for 2.5 hours to recover the residual monomer.

[0044] Test the solid content of the polymer by adding methanol to adjust the content to 30wt%, weigh 200g of the diluted polymer solution, add it to a 1500ml ...

Embodiment 3

[0053] Embodiment 3: on a tool 1500ml stirring three-necked glass reaction flask, add glass condenser and with the water cooling below 20 ° C, put in the jacket of controllable temperature rise, add 100g vinyl acetate monomer, 8g methyl alcohol, Triethylene glycol divinyl ether 0.05g, 0.095g 97.0% tert-butyl peroxyneodecanoate as the initiator, start stirring, feed nitrogen to replace the air, heat the reaction bottle, and raise the temperature to 58°C to start timing the polymerization reaction When the reaction reaches 50 minutes, the methanol solution 100 g containing 0.25 g of 1,4-butenediol is injected by a syringe pump, the injection time is 4.5 hours, and the total reaction time is terminated after 9 hours. After the polymerization was finished, 50 g of methanol was added and the temperature was raised to 90°C to evaporate for 2.5 hours to recover residual monomers.

[0054] Test the solid content of the polymer by adding methanol to adjust the content to 35wt%, weigh 2...

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Abstract

The invention belongs to the field of polymer compounds obtained by reacting only carbon-carbon unsaturated bonds, and specifically relates to a low melting point polyvinyl alcohol and a preparation method. The method comprises the following steps: 1) introducing the second monomer, the third monomer and vinyl acetate to copolymerize to prepare polyvinyl acetate copolymer; 2) two-stage alcoholysis; 3) drying process. The present application changes the main chain structure of the polyvinyl acetate copolymer by introducing the second monomer and the third monomer, so that the polyvinyl alcohol obtained after the alcoholysis of the polyvinyl acetate copolymer has the performance of a low melting point, which satisfies the requirements of production. needs.

Description

technical field [0001] The invention belongs to the field of polymer compounds obtained by reacting only carbon-carbon unsaturated bonds, and in particular relates to a low melting point polyvinyl alcohol and a preparation method. Background technique [0002] As a water-soluble polymer, polyvinyl alcohol (PVA) has a wide range of applications due to its particularity. For example: textile industry, construction industry, coatings field, adhesives, adhesives field and electronic ceramics, etc. [0003] As a completely degradable material and water-soluble polymer, polyvinyl alcohol is far from realizing the traditional processing of materials such as polyethylene, polypropylene, and polyvinyl chloride in the field of plastic processing. A large number of hydroxyl groups make it form a large number of hydrogen bonds in and between molecules, and the melting temperature (220-240︒C) and decomposition temperature (200-250︒C) of polyvinyl alcohol (PVA) are very similar, and cann...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F218/08C08F216/14C08F216/12C08F216/04C08F238/00C08F8/12
CPCC08F8/12C08F218/08C08F216/1416C08F238/00C08F216/125C08F216/04
Inventor 卢金永卢宪
Owner TIANJIN SUNNYMER
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