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 s

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

Example Embodiment

[0022] Example 1

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

[0024] Add 222gIPDI into a three-necked flask, start stirring, heat up to 70°C, add dry 500g polyethylene glycol 1000, after 30min drop completion, continue the reaction, add 100ml acetone to the system for dilution, adjust the viscosity; React for 2.5h at ℃, measure the value of -NCO, and meet the requirements.

[0025] According to the molar ratio of NCO:N-methyldiethanolamine 4:1, drop N-methyldiethanolamine into it, continue the reaction, and check the value of NCO. After reaching the requirement, follow the N-methyldiethanolamine:HCl=1:0.9 A 10% aqueous hydrochloric acid solution was added dropwise with a molar ratio of 10% at a stirring speed of 700r / min. After reaction for 1 hour, a vacuum pump was used to remove acetone at room temperature to...

Example Embodiment

[0029] Example 2

[0030] Add 1000g polyethylene glycol 2000 to a three-necked flask, heat to 100°C, vacuum to remove the water in the system, cool to 80°C, turn on the stirring, add 222gIPDI to the three-necked flask, and then slowly lower the temperature to 70°C, the reaction process According to the viscosity change, add 80-120ml acetone to the system for dilution and adjust the viscosity; after 2.5 hours of reaction, the value of -NCO is measured until the requirement is reached, and the reaction is stopped.

[0031] According to the molar ratio of NCO:N-methyldiethanolamine of 4:1, drop N-methyldiethanolamine, continue the reaction, check the value of NCO, and drop according to the molar ratio of N-methyldiethanolamine:HCl=1:1 Add a 10% aqueous hydrochloric acid solution, stir quickly at a stirring speed of 800r / min, react for 1h, and use a vacuum pump to remove acetone at room temperature to obtain cationic aqueous polyurethane. The pH of the solution is 7-7.3.

[0032] Detect...

Example Embodiment

[0035] Example 3

[0036] Add 1000g polyethylene glycol 2000 to a three-necked flask, heat to 100°C, vacuum to remove the water in the system, cool to 80°C, turn on the stirring, add 168g 1,6 hexamethylene diisocyanate to the three-necked flask, and then slowly lower the temperature to At 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 the reaction for 2.5h, measure the -NCO value until the requirement is reached, stop the reaction.

[0037] According to the molar ratio of NCO:N-methyldiethanolamine of 4:1, drop N-methyldiethanolamine, continue the reaction, check the value of NCO, and drop according to the molar ratio of N-methyldiethanolamine:HCl=1:0.9 Add 10% hydrochloric acid aqueous solution, stirring speed 1000r / min, after 1h reaction, use vacuum pump to remove acetone at room temperature to obtain cationic waterborne polyurethane, and the pH value of the solution is 7-7.3.

...

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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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