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A kind of self-emulsifying water-based alkyd resin and self-emulsifying water-based alkyd paint and preparation method

A water-based alkyd resin, self-emulsifying technology, applied in coatings, polyester coatings, etc., can solve the problems of poor chemical resistance, viscosity drop, poor storage stability, etc., and achieve good water resistance and salt spray resistance, Effects of reducing usage consumption and solving water-solubility problems

Active Publication Date: 2021-02-02
浙江大桥油漆有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of adding emulsifiers are poor chemical resistance, low molecular weight, and easy extraction from the coating film
[0008] The disadvantages of water-based alkyd resin are: because the ester bond in its main chain is easily hydrolyzed, the storage stability is not good, which will inevitably lead to the loss of drying of the coating product, the decrease of viscosity, and the poor water resistance, resulting in poor overall performance.
In addition, the relative molecular weight of the water-based alkyd resin itself is low, and the solubility of oxygen in water is low, etc., resulting in a slower drying rate than the corresponding solvent-based alkyd resin.
In addition to slower drying, early hardness, poor water and solvent resistance, and unsatisfactory hydrolytic stability for varnishes and pigments

Method used

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  • A kind of self-emulsifying water-based alkyd resin and self-emulsifying water-based alkyd paint and preparation method
  • A kind of self-emulsifying water-based alkyd resin and self-emulsifying water-based alkyd paint and preparation method
  • A kind of self-emulsifying water-based alkyd resin and self-emulsifying water-based alkyd paint and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 The preparation of self-emulsifying water-based alkyd resin

[0029] (1) Add 35g of linoleic acid, 20g of pentaerythritol, 28g of tetrahydrophthalic anhydride and 0.1g of hypophosphorous acid into the reaction kettle, and start to heat up after passing nitrogen gas for 10-20 minutes;

[0030] (2) It takes 1-3 hours to heat up the mixture in the reactor to 100-130°C, start the agitator and continue to heat up to 160-170°C;

[0031](3) Continue to heat up to 170-200°C at 10-15°C / hour, and keep warm for 2-3 hours until the material in the reactor is transparent;

[0032] (4) measure acid value, when acid value is 50~60mgKOH / g, add 8g secondary alcohol polyoxyethylene ether and carry out esterification;

[0033] (5) When the reaction is stopped and the temperature is lowered to 100-120°C, slowly add 21g of propylene glycol methyl ether dropwise, stir for 10-20min, and measure the acid value. When the acid value is less than 15mgKOH / g, cool down to obtain a sel...

Embodiment 2

[0035] Preparation of self-emulsifying waterborne alkyd resin

[0036] (1) Add 40g of linoleic acid, 20g of pentaerythritol, 25g of tetrahydrophthalic anhydride and 0.1g of benzenesulfonic acid into the reaction kettle, and start to heat up after passing nitrogen gas for 10-20min;

[0037] (2) It takes 1-3 hours to heat up the mixture in the reactor to 100-130°C, start the agitator and continue to heat up to 160-170°C;

[0038] (3) Continue to heat up to 170-200°C at 10-15°C / hour, and keep warm for 2-3 hours until the material in the reactor is transparent;

[0039] (4) measure acid value, when acid value is 50~60mgKOH / g, add 8g secondary alcohol polyoxyethylene ether and carry out esterification;

[0040] (5) When the reaction is stopped and the temperature is lowered to 100-120°C, slowly add 22g of propylene glycol methyl ether dropwise, stir for 10-20min, and measure the acid value. When the acid value is less than 15mgKOH / g, cool down to obtain a self-emulsifying water-ba...

Embodiment 3

[0042] Preparation of self-emulsifying waterborne alkyd resin

[0043] (1) Add 35g of linoleic acid, 21g of pentaerythritol, 30g of tetrahydrophthalic anhydride and 0.1g of benzenesulfonic acid into the reaction kettle, and start to heat up after passing nitrogen gas for 10 to 20 minutes;

[0044] (2) It takes 1-3 hours to heat up the mixture in the reactor to 100-130°C, start the agitator and continue to heat up to 160-170°C;

[0045] (3) Continue to heat up to 170-200°C at 10-15°C / hour, and keep warm for 2-3 hours until the material in the reactor is transparent;

[0046] (4) measure acid value, when acid value is 50~60mgKOH / g, add 8g secondary alcohol polyoxyethylene ether and carry out esterification;

[0047] (5) When the reaction is stopped and the temperature is lowered to 100-120°C, slowly add 21g of propylene glycol methyl ether dropwise, stir for 10-20min, and measure the acid value. When the acid value is less than 15mgKOH / g, cool down to obtain a self-emulsifying ...

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Abstract

The invention discloses self-emulsifying waterborne alkyd resin as well as self-emulsifying waterborne alkyd paint and a preparation method of the self-emulsifying waterborne alkyd paint. The self-emulsifying waterborne alkyd resin has a solid content of 80 plus or minus 1%, and is the self-emulsifying waterborne alkyd resin with a transparent appearance; the self-emulsifying waterborne alkyd paint is prepared by taking the self-emulsifying waterborne alkyd resin as a matrix, and mixing and stirring the self-emulsifying waterborne alkyd resin with a pigment, a drier, a neutralizer, deionized water, a defoaming agent, a substrate wetting agent, a dispersing agent and a thickener; the non-volatile matter content of the self-emulsifying waterborne alkyd paint is 45-55, the hardness is 0.3-0.5, and the VOC content is below 100g / L; the preparation method mainly comprises the following steps: a) preparation of pigment slurry, b) a mixing stage; the self-emulsifying waterborne alkyd paint iscapable of achieving or approaching the performance of solvent-based paint, and mainly used in building enamels, primers of wooden products, anti-corrosive primers, agricultural machinery, construction machinery, trains, trolleybuses, buses and steel strength beam coating systems.

Description

technical field [0001] The invention relates to the preparation of a self-emulsifying water-based alkyd resin, a self-emulsifying water-based alkyd paint and a preparation method, and belongs to the technical field of polymer resin and its preparation. Background technique [0002] With the soaring prices of petrochemical products worldwide and the increasingly stringent laws and regulations of various countries, the national policies to control air pollution are also continuously introduced, and coating manufacturers and customers are increasingly concerned about the content of volatile organic compounds (VOC) in coatings. Therefore, the water-based alkyd paint has become a hot spot in the technology development and research of the paint industry, and it is one of the important development directions of alkyd paint. Alkyd resin raw materials are easy to obtain and the process is simple. It is the most widely used of all coating resins and the most important resin for coatin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D167/08C09D7/61C08G63/49
CPCC08G63/48C08K2003/2241C08K2003/2272C08K2003/3045C09D167/08C09D7/61C08K3/22C08K3/346C08K3/04C08K3/30
Inventor 姜方群陆飞飞徐今能
Owner 浙江大桥油漆有限公司
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