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Alkyd prepolymer as well as preparation method and application of alkyd prepolymer

A prepolymer, alkyd technology, used in polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve the problem of insufficient hydrophilicity of sulfonated polyester diol and viscosity of sulfonated polyester polyol. Large, unable to react with isocyanates, etc., to achieve the effect of less addition, good hydrophilicity and good water resistance

Active Publication Date: 2018-09-28
FOSHAN JINGXIN HUIMING TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, sulfonic acid compounds are hydrated compounds or solids without water. They are only soluble in water, insoluble in organic solvents, and insoluble in diisocyanates. The intermediate link, the manufacturing process is more complicated
In order to simplify the process of introducing anionic sulfonic acid groups into the main chain of isocyanate, CN1648151A discloses a water-dispersible sulfonated polyester polyol, which can directly react with isocyanate in an organic auxiliary agent, reducing the processing steps, but, This water-dispersible sulfonated polyester polyol has a relatively high viscosity. The product BY3306B (molecular weight = 550) with the smallest molecular weight produced by Beijing Baiyuan Chemical Co., Ltd. has a solid content of only 70% and contains 30% diethylene glycol diol. Methyl ether solvent, the appearance is jelly-like, can not be dissolved in general ester, ketone solvent, and insoluble in water, can only be dispersed in water
CN103570915A discloses the preparation of a high-solid hydroxyl-containing type by reacting this water-dispersible sulfonated polyester diol with polyester diol, small molecule diol, polyol, dimethylol propionic acid, and diisocyanate In the method of water-based polyurethane resin, the added dimethylolpropionic acid is a hydrophilic group, indicating that the hydrophilicity of sulfonated polyester diol is not enough, and other hydrophilic groups need to be added. In addition, the water-based resin contains The carboxyl group needs to be neutralized with an organic amine, and there is a problem of ammonia odor and yellowing of the product

Method used

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  • Alkyd prepolymer as well as preparation method and application of alkyd prepolymer
  • Alkyd prepolymer as well as preparation method and application of alkyd prepolymer
  • Alkyd prepolymer as well as preparation method and application of alkyd prepolymer

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preparation example Construction

[0050] The preparation method of the alkyd prepolymer is to prepare the alkyd prepolymer through esterification using dicarboxylate sulfonate and small molecular diol as raw materials.

[0051] Further, the preparation method of this alkyd prepolymer comprises the following steps:

[0052] a) Add dicarboxysulfonate, small molecule glycol and water into the reactor, stir, heat up to 90°C to 97°C, mix and dissolve;

[0053] b) Add antioxidant and catalyst, close the reactor, pass in protective gas, raise the temperature of the reactor to 100°C-180°C, and carry out the esterification reaction for 10h-20h;

[0054] c) adding a solvent into the reactor to dissolve the esterification product obtained in step b), purifying by vacuum distillation, and discharging to obtain an alkyd prepolymer.

[0055] Preferably, in step a) of the preparation method, the mass ratio of dicarboxysulfonate to water is 1: (0.5-2.0); the molar ratio of dicarboxysulfonate to small molecule glycol is 1: (1...

Embodiment 1

[0078] a) Add 214g of distilled water, 168g of 1,4-butanediol, and 200g of sodium isophthalic acid-5-sulfonate into the reactor, stir, heat up to 90-97°C, mix and dissolve;

[0079] b) Add 0.4g of antioxidant 1010 and 0.2g of tetrabutyl titanate, close the reactor, feed nitrogen, and increase the steam volume when the temperature in the kettle rises to 107°C, and control the reflux temperature of the condenser water outlet to 100~ 102°C, continue to raise the temperature in the reactor to 120-130°C, and carry out the esterification reaction for 15 hours. During this period, the reflux temperature of the water outlet of the condenser is maintained at 100-102°C to control the water outlet rate of the condensed water until the water output is close to When adding water, start to measure the acid value, stop the reaction when the set acid value is reached, and turn off the cooling water of the condenser;

[0080] c) Add 122g of polyethylene glycol (molecular weight: 400) into the ...

Embodiment 2

[0083] a) Add 230g of distilled water, 127.2g of diethylene glycol, 104.2g of neopentyl glycol, and 200g of isophthalic acid-5-sodium sulfonate into the reactor, stir, heat up to 90-97°C, mix and dissolve;

[0084] b) Add 0.5g of antioxidant 1010 and 0.3g of tetrabutyl titanate, close the reactor, feed nitrogen, and increase the steam volume when the temperature in the kettle rises to 107°C, and control the reflux temperature of the water outlet of the condenser to 100- 102°C, continue to raise the temperature in the reactor to 160-170°C, and carry out the esterification reaction for 17 hours, during which the reflux temperature of the water outlet of the condenser is maintained at 100-102°C to control the water outlet rate of the condensed water until the water output is close to When adding water, start to measure the acid value, stop the reaction when the set acid value is reached, and turn off the cooling water of the condenser;

[0085]c) Add 135g of polyethylene glycol (...

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Abstract

The invention discloses an alkyd prepolymer as well as a preparation method and application of the alkyd prepolymer. The invention discloses the alkyd prepolymer prepared from raw materials includingdicarboxyl sulfonate and small-molecular diol by an esterification reaction, and the alkyd prepolymer comprises compounds with three structural formulae. Meanwhile, the invention discloses a specificpreparation method of the alkyd prepolymer and an application of the alkyd prepolymer. The invention provides the alkyd prepolymer which has an anionic sulfonic group and a nonionic hydrophilic groupand is used for preparing waterborne polyurethane. The water-soluble raw material can be used for preparing hydroxyl type waterborne polyurethane resin, a waterborne polyurethane curing agent and a waterborne sealed polyurethane curing agent, and a product can have good water dispersibility, water solubility and storage stability by only small addition amount.

Description

technical field [0001] The invention relates to an alkyd prepolymer, its preparation method and application. Background technique [0002] Polyurethane coatings and polyurethane adhesives have excellent performance and are widely used in the fields of wood furniture, automobiles, construction and flexible packaging. At present, these two types of products used in China are basically solvent-based. The main reason is that the processing technology of existing water-based products is still relatively complicated, and the variety of hydrophilic raw materials is still relatively simple. As a result, the quality of water-based products cannot completely replace solvent-based products. With the enhancement of people's awareness of environmental protection and the strengthening of the implementation of national environmental protection regulations, water-based polyurethane has become an urgent need for product transformation and development of small and medium-sized enterprises. Th...

Claims

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Application Information

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IPC IPC(8): C08G63/688C08G63/81C08G18/76C08G18/46C08G18/42C09J175/06
CPCC08G18/4238C08G18/4676C08G18/7671C08G63/6886C08G63/81C09J175/06
Inventor 周建明刘晓鸿何绍群罗铭荣
Owner FOSHAN JINGXIN HUIMING TECH CO LTD
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