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Isocyanic acid esterified chloroethylene-vinyl acetate copolymer and its preparation method

A vinyl acetate, esterified vinyl chloride technology, applied in coatings, anti-corrosion coatings and other directions, can solve the problems of poor compatibility and adhesion, low activity, etc., to achieve strong product adaptability, simple synthesis process, good electrical properties. insulating effect

Inactive Publication Date: 2006-12-27
SHANXI NUOBANG POLYURETHANE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved in the present invention is that existing hydroxylated or carboxylated vinyl chloride-vinyl acetate copolymers have low activity, poor compatibility and cohesiveness. Modification, the introduction of highly active toluene isocyanate groups in the macromolecular chain, so that it has the characteristics of high reactivity, compatibility and adhesion, the purpose is to provide an isocyanated vinyl chloride-vinyl acetate copolymer and its preparation method

Method used

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  • Isocyanic acid esterified chloroethylene-vinyl acetate copolymer and its preparation method
  • Isocyanic acid esterified chloroethylene-vinyl acetate copolymer and its preparation method
  • Isocyanic acid esterified chloroethylene-vinyl acetate copolymer and its preparation method

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specific Embodiment approach 1

[0015] (1) Catalyst preparation: 1 part of sodium hydroxide was weighed and dissolved in 80 parts of methanol, and left to stand overnight for use.

[0016] (2) Weigh 10 parts of vinyl chloride-vinyl acetate copolymer with a vinyl acetate molar content of 10.56%, place it in a reaction vessel, add 100 parts of acetone, put it into a constant temperature water bath and stir continuously, and when the temperature rises to 40°C, The vinyl chloride-vinyl acetate copolymer is fully dissolved, and the solution is uniform and transparent. At this time, 9.6 parts of sodium hydroxide methanol solution is added, and the reaction is carried out at a constant temperature of 40°C for 3 hours, and the vinyl chloride-vinyl acetate copolymer can be alcoholysed.

[0017] (3) Put the reactant solution in (2) above into a container, add methanol dropwise under magnetic stirring to precipitate the reactant, then wash and filter with methanol repeatedly three times. Vacuum drying at 40°C for 3 hou...

specific Embodiment approach 2

[0020] As in the method of Embodiment 1, 10 parts of gram vinyl chloride-vinyl acetate copolymer is dissolved in 100 parts of acetone, and when the temperature is raised to 40° C., 4.8 parts of methanolic sodium hydroxide solution is added dropwise to obtain a hydroxyl molar content of 6%. Hydroxylated vinyl chloride-vinyl acetate copolymer, precipitate and dry the copolymer; take 5 parts of the hydroxylated product and add 0.5 part of TDI-80 toluene diisocyanate at 85°C. An isocyanated vinyl chloride-vinyl acetate copolymer with a molar content of isocyanate groups of 6% was obtained. Its structural formula is as follows (I) formula:

[0021]

specific Embodiment approach 3

[0022] As in the method of embodiment 1, 10 parts of vinyl chloride-vinyl acetate copolymers with a vinyl acetate molar content of 28% are dissolved in 150 parts of acetone, and 16 parts of sodium hydroxide methanolic solution are added dropwise when the temperature is raised to 40°C To obtain a hydroxylated vinyl chloride-vinyl acetate copolymer with a hydroxyl molar content of 16%, the copolymer was precipitated and dried; 5 parts of the hydroxylated product were added to 1 part of TDI-100 toluene diisocyanate at 85°C. An isocyanated vinyl chloride-vinyl acetate copolymer with a molar content of isocyanate groups of 16% was obtained. Its structural formula is the same as the structural formula (I) of the above-mentioned specific embodiment 1 and specific embodiment 2.

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Abstract

The invention discloses a chloroethylene-vinyl acetate copolymer and the preparing method. The method comprises: converting the side group of chloroethylene-vinyl acetate copolymer into hydroxylated chloroethylene-vinyl acetate copolymer, then making it react with toluene diisocyanate and getting chloroethylene-vinyl acetate copolymer containing active toluene isocyanate group. The invention is characterized by high toughness, anti-corrosion, strong viscosity and low flammability, which are resulted from chloroethylene-vinyl acetate copolymer, and the introduction of isocyanate group increases the reaction activity, adhesive ability and hardness for chloroethylene-vinyl acetate copolymer, especially increases the compatibility, which enables it to react with more matter containing active hydrogen group and modify these matter. The invention is widely used as protective coating and anticorrosive paint for paper, metal and construction material, or used as single-component adhesives containing active isocyanate group, and as modifying agent for other matter's chemical and physical property.

Description

technical field [0001] The invention relates to an isocyanated vinyl chloride-vinyl acetate copolymer and a preparation method thereof, that is, a method for converting the side group of the vinyl chloride-vinyl acetate copolymer into a hydroxylated vinyl chloride-vinyl acetate copolymer, and then An isocyanated vinyl chloride-vinyl acetate copolymer is obtained by reacting with toluene diisocyanate and a preparation method thereof. Background technique [0002] Vinyl chloride-vinyl acetate copolymer is an industrialized commodity. Due to the internal plasticization of vinyl acetate, the low-temperature processability and solubility of vinyl chloride-vinyl acetate copolymer are improved, and the flexibility is increased. The coating of the resin is tasteless, odorless, transparent, and has the characteristics of corrosion resistance and non-combustibility of polyvinyl chloride, strong viscosity and plasticity of vinyl acetate, and easy processing. However, when these charac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/06C08F8/30C08F218/08C09D127/06C09D5/08
Inventor 李万捷刘绍波耿露王志忠
Owner SHANXI NUOBANG POLYURETHANE
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