Melamine-modified waterborne polyurethane flame-retarded resin and preparation method thereof

A technology of water-based polyurethane and melamine, which is applied in the field of preparation of melamine-modified water-based polyurethane flame-retardant resin and modified water-based polyurethane resin, which can solve the problems of poor acid and alkali resistance, poor impact resistance, aging resistance, poor hydrolysis stability, etc. Problems, to achieve the effect of low VOC, good adhesion, excellent flame retardancy

Inactive Publication Date: 2017-05-24
姚东生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyurethane can be divided into polyester type and polyether type according to different oligomer polyols. Under outdoor exposure conditions, the aging resistance and hydrolysis resistance of these two types of polyurethane resins are relatively poor.
At the same time, polyurethane also has problems such as poor impact resistance, easy foaming when exposed to moisture, and poor acid and alkali resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A melamine-modified waterborne polyurethane flame-retardant resin, and its preparation process is as follows:

[0023] a. In a four-neck reactor equipped with a thermometer, a condenser, and a stirrer, add 3.0 parts of butanediol, 1.5 parts of trimethylolpropane, 6.0 parts of polytetrahydrofuran polyol, and dihydroxyl 2.6 parts of methyl propionic acid, heated to 95~110℃, vacuum dehydration for 1.5~2.0h;

[0024] b. Cool down to 60~70℃, add 2.0 parts of melamine, dropwise add 18.0 parts of hexamethylene diisocyanate, and complete the addition within 0.5~1h; then add 0.05 parts of dibutyltin dilaurate dropwise, and heat up to 80~82℃ React for 2 to 2.5 hours, add 6.0 parts of acetone, measure the NCO value, and terminate the reaction when the measured value is close to the theoretical design value;

[0025] c. Continue stirring to reduce the temperature to below 40℃, slowly add 1.9 parts of neutralizing agent triethylamine, continue stirring for 10-20 minutes, add 57.75 parts o...

Embodiment 2

[0027] A melamine-modified waterborne polyurethane flame-retardant resin, and its preparation process is as follows:

[0028] a. In a four-neck reactor equipped with a thermometer, a condenser, and a stirrer, add 3.5 parts of butanediol, 2.5 parts of glycerin, 7.0 parts of polytetrahydrofuran polyol, and dimethylolpropionic acid according to the weight percentage of the formula. 2.8 parts, heated to 95~110℃, vacuum dehydration for 1.5~2.0h;

[0029] b. Cool down to 60~70℃, add 2.2 parts of melamine, drip 20.0 parts of isophorone diisocyanate, and complete the dripping within 0.5~1h; then add 0.05 parts of dibutyltin dilaurate, and heat up to 80~82℃ React for 2 to 2.5 hours, add 7.0 parts of acetone, measure the NCO value, and terminate the reaction when the measured value is close to the theoretical design value;

[0030] c. Continue stirring to reduce the temperature to below 40℃, slowly add 2.1 parts of neutralizing agent triethylamine, continue to stir for 10-20 minutes, add 50.8...

Embodiment 3

[0032] A melamine-modified waterborne polyurethane flame-retardant resin, and its preparation process is as follows:

[0033] a. In a four-neck reactor equipped with a thermometer, a condenser, and a stirrer, add 3.2 parts of neopentyl glycol, 1.2 parts of trimethylolpropane, 5.5 parts of polytetrahydrofuran polyol, and two parts according to the weight percentage of the formula. 2.4 parts of hydroxymethyl propionic acid, heated to 95~110℃, vacuum dehydration for 1.5~2.0h;

[0034] b. Cool down to 60-70℃ and add 1.5 parts of melamine, drip 16.0 parts of toluene diisocyanate, and the addition will be completed within 0.5~1h; then add 0.05 parts of dibutyltin dilaurate dropwise, and heat up to 80~82℃ for reaction 2~ 2.5h, add 6.5 parts of acetone, measure the NCO value, and terminate the reaction when the measured value is close to the theoretical design value;

[0035] c. Continue stirring to lower the temperature to below 40℃, slowly add 2.0 parts of neutralizing agent triethylamine...

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Abstract

The invention provides a melamine-modified waterborne polyurethane flame-retarded resin. The melamine-modified waterborne polyurethane flame-retarded resin is prepared by virtue of chemical reaction of polyisocyanate, polyhydric alcohol, polybasic amine chain extender, low-polymer polyhydric alcohol, dimethylolpropionic acid, melamine, a neutralizer and de-ionized water. The invention also provides a preparation method of the melamine-modified waterborne polyurethane flame-retarded resin. The melamine-modified waterborne polyurethane flame-retarded resin has the characteristics of excellent fire retardance, favorable adhesion, color retention, corrosion resistance, water resistance, alkali resistance, abrasion resistance and the like, is extremely low in VOC and environmentally friendly, can be used for waterborne fire-retardant paint, waterborne flame-retardant paint, waterborne anticorrosion paint, waterborne waterproof and moisture-proof paint, waterborne engineering special paint, waterborne woodware paint and the like, and can be used for leather tanning agents, adhesive agents for synthesizing fireproof laminates, concrete waterproof agents and the like.

Description

Technical field [0001] The invention relates to a preparation method of a modified waterborne polyurethane resin, in particular to a melamine modified waterborne polyurethane flame retardant resin with high hardness, good water resistance and good flame retardant performance, belonging to the technical field of waterborne synthetic resins. Background technique [0002] Polyurethane is formed by the reaction of oligomer polyols, small molecular polyols, polyisocyanates and chain extenders. The reaction raw materials and process factors have a great influence on the morphology of polyurethane materials. Oligomer polyols provide soft segments. Isocyanate provides hard segments. This combination of soft and hard structure makes polyurethane possess both high elasticity and high hardness, so as to achieve the researcher's design of special polymer resin. Polyurethane also has good solvent resistance, abrasion resistance and flexural resistance, so it is widely used in coatings, adhesi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/08C08G18/12C08G18/32C08G18/34C08G18/48
CPCC08G18/12C08G18/0823C08G18/3206C08G18/348C08G18/3851C08G18/4854C08G18/6692C08G18/3228
Inventor 姚东生
Owner 姚东生
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