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Water-based polyamide wax rheological additive with improved thermal stability and preparation method thereof

A technology of thermal stability additives and polyamide waxes, applied in the field of water-based rheological additives of coating additives, can solve the problems of loss of thickening and thixotropic properties, low molecular weight, and difficulty in re-establishing hydrogen bonds, etc., to achieve anti-sedimentation and the effect of reducing the anti-sag performance

Pending Publication Date: 2021-03-19
ZHEJIANG FENGHONG NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its low molecular weight, poor crystallinity, and unstable crystal structure, it has relatively poor thermal stability in the system.
When the temperature rises, the crystal structure of the material is destroyed, it is completely dissolved in the system, the hydrogen bond is destroyed, and because the distance between the molecular chains is too large, the hydrogen bond is difficult to re-establish, and the thickening and thixotropic properties are lost. Serious delamination and sinking of water-based coatings, and even irreversible hard sinking, will inevitably cause huge losses to related companies

Method used

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  • Water-based polyamide wax rheological additive with improved thermal stability and preparation method thereof
  • Water-based polyamide wax rheological additive with improved thermal stability and preparation method thereof
  • Water-based polyamide wax rheological additive with improved thermal stability and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] In a 1000ml four-neck flask, first add 2mol of 12-hydroxystearic acid, raise the temperature to 120°C, after the 12-hydroxystearic acid is completely melted, then add 1mol of 4,4'-diaminodicyclohexyl Methane, nitrogen, heated to 160 ° C to start the dehydration reaction until anhydrous out and the acid value of the reaction product ≦ 10 mgKOH / g to stop the reaction, the product was cooled to obtain a beige solid - thermal stability aid A1.

[0027] In a 500ml four-neck flask, first add 6g of heat stabilization additive A1 and 24g of water-based polyamide wax resin (polymerized from dimer acid and hexamethylenediamine) with an acid value of 75mgKOH / g, and then add 15g of propylene glycol monomethyl ether and 5g of propylene glycol n-propyl ether as an organic solvent, install an oil bath, a stirrer, a temperature controller and a spherical condenser, heat up to 110° C. and stir to dissolve at a constant temperature. After the above ingredients are dissolved, add 5g of N,...

Embodiment 2

[0029] In a 1000ml four-neck flask, first add 1mol of 12-hydroxystearic acid, 1mol of stearic acid, and heat up to 110°C. After the monobasic acid is completely melted, add 0.4mol of 3,3'-dimethyl- 4,4'-diaminodicyclohexylmethane, and blow nitrogen, heat up to 140°C to start the dehydration reaction, add 0.6mol 4,4'-diaminodicyclohexylmethane after reacting for 6 hours, heat up to 160°C to react until anhydrous The reaction is terminated when the acid value of the reaction product is less than or equal to 10 mgKOH / g, and the product is cooled to obtain a beige solid-thermal stabilization aid A2.

[0030]In a 500ml four-necked flask, first add 4g of heat stabilization additive A2, and 16g of water-based polyamide wax resin (made of dimer acid, 1,6 hexamethylenediamine and 1,10-decane) with an acid value of 90mgKOH / g Polymerized diamine), then add 16 grams of propylene glycol monobutyl ether as an organic solvent, install the oil bath, stirrer, temperature controller and spheric...

Embodiment 3

[0031] Example 3: In a 1000ml four-necked flask, first add 1.2mol of 12-hydroxystearic acid, 0.3mol of palmitic acid and 0.5mol of lauric acid and raise the temperature to 130°C. After the monobasic acid is completely melted, add 0.3 mol of dipolyamine, and blown with nitrogen, the temperature was raised to 150°C to start the dehydration reaction, and after 4 hours of reaction, 0.4 mol of 4,4'-diaminodicyclohexylmethane and 0.3 mol of 3,3'-dimethyl-4 , 4'-diaminodicyclohexylmethane, and heated to 170 ° C to react until anhydrous and the acid value of the reaction product ≦ 10 mgKOH / g, the reaction was terminated, and the product was cooled to obtain a beige solid A3.

[0032] First add 7g of active ingredient A3, and 33g of water-based polyamide wax resin (polymerized from dimer acid, sebacic acid, 1,6 hexamethylenediamine and p-phenylenediamine) with an acid value of 64mgKOH / g, and then add 18 grams of propylene glycol monobutyl ether and 6 g of propylene glycol monomethyl et...

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Abstract

The invention relates to polyamide wax for water-based paint, in particular to a water-based polyamide wax rheological additive with improved thermal stability and a preparation method thereof. The water-based polyamide wax rheological additive with improved thermal stability comprises the following components in parts by mass: 10-20 parts of water-based polyamide wax resin, 0.1-6 part of a thermal stability additive, 2-5 parts of a surfactant, 2-5 parts of organic amine, 6-15 parts of an organic solvent and 50-80 parts of water. According to the invention, the thermally stable auxiliary agentcomponent is introduced in the pulping process, so that the water-based paint is endowed with excellent thermal storage performance, and the anti-settling and anti-sagging properties of the water-based paint are hardly influenced after thermal storage.

Description

technical field [0001] The invention relates to a polyamide wax used for water-based coatings, in particular to a water-based polyamide wax rheological additive with improved thermal stability and a preparation method thereof, belonging to the technical field of water-based rheological additives of coating additives. Background technique [0002] To improve the performance of water-based coatings, the use of coating additives is indispensable, especially high-performance water-based rheological additives. High-performance water-based rheology additives can not only adjust the rheological properties of water-based coatings, improve their pseudoplasticity, but also make the mechanical and physical and chemical properties of water-based coatings more excellent and stable, and make water-based coatings have excellent construction performance and storage performance. [0003] Water-based polyamide wax is a commonly used water-based rheology additive, which is usually used as a wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/65C08L77/06C08L77/00
CPCC09D7/65C08L77/06C08L2201/08C08L2205/02C08L2205/24C08L77/00
Inventor 罗军刘金玲赵静王春伟
Owner ZHEJIANG FENGHONG NEW MATERIAL
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