Polyvinyl acetate with low polymerization degree and polymerization method thereof

A technology of polyvinyl acetate and low polymerization degree, which is applied in the field of polymer and its preparation, and can solve the problems of no PVAC and other problems

Active Publication Date: 2009-09-30
ANHUI WANWEI UPDATED HIGH TECH MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PVA with a low degree of polymerization (that is, PA<500) has a wider range of uses due to its good fluidity and other properties, but there is currently no corresponding PVAC with PA<500.

Method used

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  • Polyvinyl acetate with low polymerization degree and polymerization method thereof
  • Polyvinyl acetate with low polymerization degree and polymerization method thereof
  • Polyvinyl acetate with low polymerization degree and polymerization method thereof

Examples

Experimental program
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Embodiment Construction

[0017] Now take the PVAC of processing PA=400±50 as an example, and the non-limiting embodiment is described as follows:

[0018] 1. Ingredients

[0019] Take VAC 1000L (approximately 930kg) with a purity of 99.3%, add 200L of methanol and put it into a polymerization kettle equipped with a stirrer and a reflux condenser.

[0020] Take 0.47kg of initiator AIBN (0.05% of VAC) to prepare a methanol solution with a concentration of 1.0-1.5%.

[0021] Take 3.7kg of methyl mercaptan and make it into a methanol solution with a concentration of 10-12%.

[0022] 2. Polymerization

[0023] When the monomer is preheated to 59°C, add the methanol solution of initiator and chain transfer agent, polymerize at 65°C for 2.5 hours, stir at a speed of 7-8 rpm, then reduce the speed to 5-6 rpm to continue polymerization 2.5 hours.

[0024] 3. Separation

[0025] After the polymerization reaction is completed, it is transferred to a still, and methanol vapor is blown from the bottom of the ...

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Abstract

Polyvinyl acetate with low polymerization degree has a polymerization degree which is equal to or more than 200 and less than 500. The polymerization method is that monomer vinyl acetate polymerizes by the initiation of a free radical with the existence of initiating agent AIBN and chain transfer agent mercaptan. The mercaptan is selected from methyl hydrosulfide and/or ethanethiol, the addition amount is 0.2-0.6% of the monomer weight. The polyvinyl acetate resin of the invention has narrow molecular weight distribution, and the ratio of a height homo-polymerization degree and a number homo-polymerization degree is from 2.0 to 2.5.

Description

1. Technical field [0001] The invention relates to a polymer and a preparation method thereof, in particular to a low degree of polymerization polyvinyl acetate and a polymerization method thereof. 2. Background technology [0002] One of the main uses of polyvinyl acetate (PVAC) is the raw material for the preparation of polyvinyl alcohol (PVA) by alcoholysis. PVA is a water-soluble polymer with a wide range of uses, and it is in the form of white or slightly yellow powder. PVA is obtained by the alcoholysis of PVAC and methanol solution of sodium hydroxide in a belt alcoholysis machine. Alcoholysis is to replace the side acetyl group on the PVAC molecular chain with a hydroxyl group. The degree of alcoholysis is mostly 78%, 88% and 99%, and PVA with a degree of alcoholysis of 99% is mostly used as a raw material for vinylon. [0003] PVAC is prepared by free radical polymerization of monomer vinyl acetate (VAC) in a solvent. The solvents include methanol, benzene, tolue...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F118/08
Inventor 吴福胜高申宝李泰徐凌云陈俊
Owner ANHUI WANWEI UPDATED HIGH TECH MATERIAL CO LTD
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