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Polyurethane resin-based metal heat treatment protective paint and preparation method thereof

A polyurethane resin and protective coating technology, applied in anti-corrosion coatings, fire-retardant coatings, coatings, etc., can solve the problems of oxidation and decarburization, and achieve the effect of excellent adhesion and good toughness

Inactive Publication Date: 2016-09-28
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a polyurethane resin-based protective coating for metal thermal processing in order to solve the problems of oxidation and decarburization during metal thermal processing and the deficiencies of existing inorganic non-metallic metal thermal processing protective coatings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Component A material: put 60 parts of EG, 121 parts of DY-120 parts, and 120 parts of DMTDA into the reactor and stir at a speed of 60-80 rpm, and stir for 0.5-1 hour to prepare the component A material.

[0028] Component B material: First, dehydrate the polyoxypropylene glycol at 110°C for 1 to 2 hours under vacuum, and the vacuum degree is less than 1kPa. Then 100 parts of polyoxypropylene glycol after dehydration, TDI (measured according to the molar ratio of hydroxyl groups in polyether polyols to isocyanate groups in isocyanate 1: 1.8), and 30 parts of cyclodextrin-coated ammonium polyphosphate microcapsules Put it into the reaction kettle, start stirring, and react at 80°C for 1 to 2 hours. When the content of isocyanic acid groups is basically unchanged, cool down to room temperature to prepare component B material.

[0029] When using, mix components A and B according to the mass ratio of A:B=10:100, and then spray or hand-paste on the metal surface.

[0030] ...

Embodiment 2

[0032] Component A material: put 100 parts of EG, 10 parts of DY-1210 parts, and 100 parts of DMTDA into the reactor and stir at a speed of 60-80 rpm, and stir for 0.5-1 hour to prepare the component A material.

[0033] Component B material: First, dehydrate the polyoxypropylene glycol at 110°C for 1 to 2 hours under vacuum, and the vacuum degree is less than 1kPa. Then 100 parts of polyoxypropylene glycol after dehydration, TDI (measured according to the molar ratio of hydroxyl groups in polyether polyols to isocyanate groups in isocyanates at 1:2), and 50 parts of melamine formaldehyde-coated ammonium polyphosphate microcapsules were dropped into In the reaction kettle, start stirring, and react at 80°C for 1 to 2 hours. When the content of isocyanate groups is detected to be basically unchanged, cool down to room temperature to prepare component B material.

[0034] When using, mix components A and B according to the mass ratio of A:B=20:100, and then spray or hand-paste o...

Embodiment 3

[0037] Component A material: Put 120 parts of BDO, 15 parts of DY-1215 and 60 parts of DMTDA into the reactor and stir at a speed of 60-80 rpm, and stir for 0.5-1 hour to prepare the component A material.

[0038] Component B material: First, dehydrate the polytetrahydrofuran diol under vacuum at 110°C for 1-2 hours, and the vacuum degree is less than 1kPa. Then 100 parts of polytetrahydrofuran diol after dehydration, NBDI (measured according to the molar ratio of hydroxyl groups in polyether polyols to isocyanate groups in isocyanates at 1:2), and 30 parts of epoxy rubber-coated ammonium polyphosphate microcapsules were dropped into In the reaction kettle, start stirring, and react at 80°C for 1 to 2 hours. When the content of isocyanate groups is detected to be basically unchanged, cool down to room temperature to prepare component B material.

[0039] When using, mix components A and B according to the mass ratio of A:B=30:100, and then spray or hand-paste on the metal surf...

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Abstract

The invention discloses polyurethane resin-based metal heat treatment protective paint which comprises a component A and a component B. The component A comprises the following ingredients in parts by weight: 60-120 parts of a small-molecular alcohol compound, 1-20 parts of a catalyst and 60-120 parts of a chain extender. The component B comprises the following ingredients in parts by weight: 100 parts of polyether polyol, isocyanate and 30-60 parts of an inrumescent flame retardant. The mole ratio of a hydroxide radical in polyether polyol to an isocyanate group in isocyanate is 1:(1.8-2.5). The component A and the component B are uniformly mixed according to the mass ratio being (10-30):100. The storage requirements of billets can be met under different process conditions by using high adhesion between a polyurethane resin matrix and the surface of a metal material. The polyurethane resin can also be cured at 0 DEG C, can meet the requirement of spraying the billets in a extreme climate, is high in toughness, and can effectively avoid paint falling due to collision and friction during the billet piling process. In the relatively low temperature period, the polyurethane resin forms the continuous paint, and protects the metal surface; and in the high temperature period, the inrumescent flame retardant is decomposed to form a dense carbon layer to protect the metal surface.

Description

technical field [0001] The invention belongs to the field of coatings, and relates to a metal coating, in particular to a polyurethane resin-based metal thermal processing protective coating. Background technique [0002] Thermal processing of metal materials usually requires heating and heat preservation in air medium. With the increase of temperature, the metal will undergo oxidative decarburization. During the oxidation of metals, oxide scales are usually formed. Analyzing the structure of the oxide scale, it can be found that the structure is loose and cracked, and the thickness is very thick, resulting in the loss of metal materials and the reduction of mechanical properties; at the same time, it takes manpower, material and financial resources to remove the oxidized and decarburized layer. [0003] Measures to reduce high-temperature oxidative decarburization include vacuum protection heating, salt bath heating, controllable atmosphere protection, heating parts coate...

Claims

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Application Information

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IPC IPC(8): C09D175/08C09D5/18C09D5/08C08G18/66C08G18/48C08G18/32
CPCC09D175/08C08G18/3206C08G18/3868C08G18/48C08G18/6674C08G18/6685C09D5/08C09D5/185
Inventor 朱治愿徐进张竞汤继俊李照磊陈斌
Owner JIANGSU UNIV OF SCI & TECH
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