Normal-temperature curing type metal primer and preparation method thereof

A room temperature curing, metal bottom technology, applied in coatings, epoxy resin coatings, polyurea/polyurethane coatings, etc., can solve the problems of difficult pre-treatment production lines, time-consuming and energy-consuming

Pending Publication Date: 2021-06-22
苏州市陆氏新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The pre-coating of metal coils usually adopts the above-mentioned comprehensive treatment process. This comprehensive treatment requires a complete pre-treatment production line, which is time-consuming and energy-consuming. For requirements such as small quantity and many varieties, on-site coating, and on-site composite bonding, a pre-treatment production line is required. often difficult to achieve

Method used

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  • Normal-temperature curing type metal primer and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment provides a solvent-based metal primer, which is prepared through the following steps:

[0026] (a) 100 parts by weight of high molecular weight epoxy resin (usually bisphenol A type, with a softening point of 140°C-155°C) and 20 parts by weight of heat-activated TPU resin (heat activation temperature of 50°C-60°C) are dissolved In 680 parts by weight of a mixed solvent (butanone: ethyl acetate: butyl acetate = 2:1:1, volume ratio), stir and dissolve to obtain component A, with a solid content of 15%, marked as: A1 (Example);

[0027] (b) Dissolve 100 parts by weight of polyisocyanate (polyphenyl polyisocyanate) in 100 parts by weight of ethyl acetate to obtain the first mixture; dissolve 10 parts by weight of silane coupling agent (aminosilane) in 40 parts by weight of ethyl acetate The second mixture was obtained in the ester; under the high-speed stirring state, the second mixture was added dropwise to the first mixture, and the B component was obtaine...

Embodiment 2

[0029] This embodiment provides a solvent-based metal primer, which is prepared through the following steps:

[0030] Basically consistent with that in Example 1, the difference is: in A2 (embodiment), the ratio of macromolecular epoxy resin and TPU is 100:30; Among the B2 (embodiment), the ratio of isocyanate and silane coupling agent is 100 :20.

Embodiment 3

[0032] This embodiment provides a solvent-based metal primer, which is prepared through the following steps:

[0033] Basically consistent with that in Example 1, the difference is: in A3 (embodiment), the ratio of polymer epoxy resin and TPU is 100:40; among the B3 (embodiment), the ratio of isocyanate and silane coupling agent is 100 :30.

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Abstract

The invention provides a normal-temperature curing type metal primer and a preparation method thereof. The preparation method comprises the following steps: dissolving high-molecular-weight epoxy resin and thermoplastic TPU resin in a mixed solvent to obtain a component A of the metal primer; dissolving polyisocyanate in ethyl acetate to obtain a first mixture; dissolving a silane coupling agent in ethyl acetate to obtain a second mixture; under a stirring state, dropwise adding the second mixture into the first mixture, and fully reacting to obtain a component B of the metal primer; and mixing the metal primer component A with the metal primer component B to obtain the normal-temperature curing type metal primer. The normal-temperature curing type metal primer prepared by the preparation method is uniformly brushed on the metal surface subjected to oil removal and rust removal, natural drying is performed for 6 hours, and pretreatment is not needed.

Description

technical field [0001] The invention belongs to the technical field of composite reagents, and relates to a metal primer, in particular to a normal temperature curing metal primer and a preparation method thereof. Background technique [0002] During the mechanical processing of metal materials, lubricating oil is usually used, finished products and semi-finished products stored for a long time, or pre-coated with anti-rust oil between processes with a long processing cycle; metal parts are exposed to oily grinding fluid, oily Grinding paste, etc.; during transportation and storage, surface oxidation produces metal oxides and rust with different properties and thicknesses. These pollutants seriously affect the surface coating quality and composite bonding strength of metal materials. [0003] There are many methods for surface treatment of metal materials, which can be summed up as mechanical treatment and chemical treatment. Generally, oil is removed first, then rust is re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D175/04C09D7/63
CPCC08L2207/04C09D163/00C09D7/63C08L75/04C08K5/29C08K5/544
Inventor 陆建明
Owner 苏州市陆氏新材料有限公司
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