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Method for preparing pectinate organic silicon-modified polyurethane grafted ethylene-vinyl acetate (EVA) water emulsion

A water-based emulsion, polyurethane technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve problems such as never before, and achieve the effect of good waterproof performance, good weather resistance, and high peel strength

Active Publication Date: 2014-06-04
INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the existing polyurethane grafted EVA is mainly an oily system, and this work has not been carried out in a water-based system.

Method used

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  • Method for preparing pectinate organic silicon-modified polyurethane grafted ethylene-vinyl acetate (EVA) water emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A certain amount of polyethylene glycol 1000 was added into a three-necked flask, the temperature was raised to 100°C, the water in the system was removed by vacuuming, and the temperature was lowered for later use.

[0024] Add 222g of IPDI into the three-necked flask, start stirring, raise the temperature to 70°C, add 500g of dried polyethylene glycol 1000, after 30 minutes of dropwise addition, continue the reaction, add 100ml of acetone to the system for dilution and adjust the viscosity; at 70 ℃ reaction 2.5h, measure the value of -NCO, meet the requirements.

[0025] According to the molar ratio of NCO: N-methyldiethanolamine is 4:1, add N-methyldiethanolamine dropwise, continue the reaction, and detect the value of NCO. After meeting the requirements, follow N-methyldiethanolamine: HCl=1:0.9 10% hydrochloric acid aqueous solution was added dropwise at a molar ratio of 10%, and the stirring speed was 700r / min. After reacting for 1h, the acetone was removed by vacu...

Embodiment 2

[0030] Add 1000g of polyethylene glycol 2000 into the three-necked flask, raise the temperature to 100°C, remove the water in the system by vacuuming, cool down to 80°C, start stirring, add 222g of IPDI to the three-necked flask, and then slowly cool down to 70°C, the reaction process According to the viscosity change, add 80-120ml of acetone to the system for dilution and adjust the viscosity; after 2.5 hours of reaction, measure the value of -NCO until it reaches the requirement, stop the reaction.

[0031] Add N-methyldiethanolamine dropwise according to the molar ratio of NCO: N-methyldiethanolamine 4:1, continue the reaction, detect the value of NCO, drop according to the molar ratio of N-methyldiethanolamine: HCl=1:1 Add hydrochloric acid aqueous solution with a concentration of 10%, and carry out rapid stirring at a stirring speed of 800r / min, and react for 1 hour. Use a vacuum pump to remove acetone at room temperature to obtain cationic water-based polyurethane, and th...

Embodiment 3

[0036] Add 1000g of polyethylene glycol 2000 into the three-necked flask, raise the temperature to 100°C, remove the water in the system by vacuuming, cool down to 80°C, start stirring, add 168g of 1,6-hexamethylene diisocyanate into the three-necked flask, and then slowly cool down to 70°C, during the reaction process, according to the viscosity change, add 60-100ml acetone to the system for dilution and adjust the viscosity; after 2.5 hours of reaction, measure the value of -NCO until it meets the requirements, and stop the reaction.

[0037]Add N-methyldiethanolamine dropwise according to the molar ratio of NCO: N-methyldiethanolamine: 4:1, continue the reaction, detect the value of NCO, drop according to the molar ratio of N-methyldiethanolamine: HCl=1:0.9 Add 10% hydrochloric acid aqueous solution, stirring speed 1000r / min, react for 1 hour, use vacuum pump to remove acetone at room temperature, and obtain cationic water-based polyurethane. The pH value of the solution is ...

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Abstract

The invention relates to a method for preparing a pectinate organic silicon-modified polyurethane grafted ethylene-vinyl acetate (EVA) water emulsion. The method comprises the following steps: preparing isocyanate-terminated cation polyurethane from diisocyanate, polyether glycol and N-methyldiethanolamine; carrying out grafted reaction on the diluted acrylamide copolymer emulsion and an isocyanate-terminated polyurethane modified body after cationic chain extension modification; and finally modifying by adopting organic silane hydrolysate, so as to prepare an alkaline white emulsion. The prepared product disclosed by the invention has the advantages of EVA resin, polyurethane and polysiloxane, has high comprehensive performance, and can be applied to a water adhesive under a special environment, and preparation of a water-based paint with high performance.

Description

[0001] technical field [0002] The invention relates to a method for preparing a comb-shaped organosilicon-modified polyurethane grafted EVA water-based emulsion, which belongs to the technical field of organosilicon-modified coatings. Background technique [0003] In the application of EVA emulsion in adhesives, the bonding and tensile properties of various surface smooth materials cannot meet the requirements of use due to its own structure, and different modifications are required to improve its performance. At present, it is mostly used The blending method is used to modify the EVA emulsion. Since the homogeneity of the blended polymer is easily affected by various conditions, which affects its later use performance, the method of chemical grafting is the most effective modification method. Polyurethane prepolymer is used to graft and modify it to improve its comprehensive performance. It has been used in polyurethane modified hot-melt resins, mainly using toluene dii...

Claims

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Application Information

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IPC IPC(8): C08G81/02C08G18/66C08G18/48C08G18/32C09D175/08C09D123/08C09D131/04
Inventor 曾国屏陈衍华董晓娜孙复钱岳春波单人为
Owner INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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