Modified nylon powder coating and preparation method thereof

A powder coating and modified nylon technology, applied in powder coating, polyamide coating, coating, etc., can solve the problems of reducing nylon powder coating, high health and environmental protection costs, unfavorable promotion, etc., and achieve poor fluidity and easy implementation application, environment-friendly effect

Inactive Publication Date: 2013-01-30
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the high melting point of the above-mentioned nylon 6 and nylon 66 powder coatings, large smoke will be generated in the production process of the open system, which will have a negative impact on the health and environmental protection of operators, and the cost of nylon 11 and nylon 12 series powder coatings is relatively high. The disadvantages such as being beneficial to popularization, the object of the present invention is to provide modified nylon powder coat

Method used

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  • Modified nylon powder coating and preparation method thereof

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preparation example Construction

[0027] combine figure 1 , modified nylon powder coating of the present invention and preparation method thereof, its steps are as follows:

[0028] When using hexamethylenediamine and adipic acid in an equimolar ratio as raw materials in the preparation process, it is necessary to form a salt first.

[0029] Salt formation: Weigh hexamethylenediamine and adipic acid in an equimolar ratio, put them into a high-pressure reactor, use demineralized water as a solvent, and the quality of softened water is 50% of the total mass of hexamethylenediamine and adipic acid, and keep warm at 75°C for 1 hours, adjust the pH value to 7.0-7.2, the pre-salt formation is completed, and the salt-formation product is obtained.

[0030] When the raw material does not contain hexamethylene diamine, it can directly start from the polymerization step.

[0031]Polymerization: adding 50-80 parts by mass of caprolactam or nylon 6 resin, 50-80 parts by mass of nylon 66 salt, nylon 66 resin or the salt...

Embodiment 1

[0034] Modified nylon powder coating of the present invention and preparation method thereof, its steps are as follows:

[0035] When using hexamethylenediamine and adipic acid in an equimolar ratio as raw materials in the preparation process, it is necessary to form a salt first.

[0036] Salt formation: Weigh hexamethylenediamine and adipic acid in an equimolar ratio, put them into a high-pressure reactor, use demineralized water as a solvent, and the quality of softened water is 50% of the total mass of hexamethylenediamine and adipic acid, and keep warm at 75°C for 1 hours, adjust the pH value to 7.0-7.2, the pre-salt formation is completed, and the salt-formation product is obtained.

[0037] Polymerization: Adding 60 parts by mass of caprolactam and 40 parts of the salt-forming product of hexamethylenediamine and adipic acid in an equimolar ratio to the autoclave, adding additives, including antioxidants, nucleating agents and molecular weight regulators, respectively I...

Embodiment 2

[0040] Modified nylon powder coating of the present invention and preparation method thereof, its steps are as follows:

[0041] When the raw material does not contain hexamethylene diamine, it can directly start from the polymerization step.

[0042] Polymerization: 80 parts by mass of caprolactam and 20 parts of nylon 66 salt were added to the autoclave, and additives, including antioxidants, nucleating agents and molecular weight regulators, were respectively 0.2 parts of antioxidant 1098 and 0.1 parts of gas phase II Silicon oxide, 0.1 part of adipic acid. Replace the air in the autoclave twice with carbon dioxide, then turn on the electricity to heat, and start stirring at the same time. When the temperature in the autoclave reaches 180°C and the pressure reaches 1.2MPa, start to maintain the pressure. At the same time, the temperature of the material should not be higher than 230°C. hour, and then within 2 hours, the pressure in the kettle was uniformly reduced to norma...

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Abstract

The invention discloses a modified nylon powder coating and a preparation method thereof. The preparation method comprises the following steps of: firstly preparing a polymerization product by performing polymerization reaction on the following main synthetic materials in parts by mass: 50 to 80 parts of caprolactam or nylon 6 resin, 20 to 50 parts of nylon 66 salt, nylon 66 resin or equal mole ratio of hexamethylene diamine and hexanedioic acid, and 0.02 to 1.7 parts of an auxiliary agent; and then preparing the modified nylon powder coating through the processes of extrusion modification, deep cooling crushing and treatment with a powder surface treatment agent. The auxiliary agent comprises an antioxidant, a nucleating agent and a molecular weight adjusting agent. The modified nylon powder coating prepared by the method is lower in melting point, simple in process control and stable in product quality, can partially substitute nylon 11 and nylon 12 powder products, can effectively reduce the using cost of nylon powder, is favorable for application popularization of the nylon powder, and has a great market potential.

Description

technical field [0001] The invention relates to powder coatings in the field of polymer materials, in particular to a modified nylon powder coating and a preparation method thereof. Background technique [0002] Nylon powder has been widely used in powder coatings, fillers, adhesives and other fields due to its excellent friction properties and wide range of operating temperature characteristics. The melted nylon powder has good leveling properties, especially the low melting point nylon powder is in contact with the metal after melting, which can form a good interfacial force, which can effectively improve the surface properties and friction properties of metal materials. The most used varieties of nylon products are nylon 6 and nylon 66. The melting point of nylon 6 is 220~230°C, and the melting point of nylon 66 is 260~270°C. Nylon powder coating to use. In addition, when heated in an open system production process, nylon 6 and nylon 66 will produce relatively large smo...

Claims

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Application Information

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IPC IPC(8): C09D177/02C09D177/06C09D5/03C09D7/12
Inventor 韩冰冯志明张春祥张声春张克杰周明徐良潘吴彬吴玉成
Owner NANJING INST OF TECH
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