High hydroxy alkyd resin for polyurethane curing agent and preparation method thereof

A technology of polyurethane curing agent and high-hydroxy alkyd, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of reduced effective NCO group content, reduced cross-linking reactivity, and reduced hardness of curing agent to achieve effective NCO Increased content, good cross-linking density, and increased hardness

Active Publication Date: 2011-08-17
CARPOLY CHEM GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when using the existing hydroxyl-containing alkyd resin and the isocyanate monomer containing NCO group to add reaction under certain reaction conditions to generate a two-component modified polyurethane curing agent containing active NCO group, the hardness of the curing agent itself is reduced, The effective NCO group content is reduced, and the crosslinking reaction activity is reduced, the crosslinking density is reduced, and the hardness is reduced when forming a film with a hydroxyl-containing paint component.

Method used

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  • High hydroxy alkyd resin for polyurethane curing agent and preparation method thereof
  • High hydroxy alkyd resin for polyurethane curing agent and preparation method thereof

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[0045] The present invention will be described in detail below in conjunction with specific embodiments. The description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the present invention.

[0046] It should be noted that: the lauric acid, benzoic acid, phthalic anhydride, pentaerythritol, glycerol, hypophosphorous acid, 2,6-di-tert-butyl-4-methylphenol, xylene and ethyl acetate used in the following examples are domestic Industrial grade raw materials.

[0047] The preparation method of the high hydroxyl alkyd resin of following embodiment all adopts the identical process that comprises following steps, just the proportioning difference of each raw material:

[0048] 1. Pre-pass N into a clean reactor 2 ↑5min (flow: 4m 3 / h);

[0049] 2. Add lauric acid, glycerin, benzoic acid, phthalic anhydride, pentaerythritol, hypophosphorous acid, 2,6-di-tert-butyl-4-methylphenol, xylene in sequence according to the...

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Abstract

The invention discloses a high hydroxy alkyd resin for modifying a polyurethane curing agent, which is prepared from the following raw materials in parts by weight: 9-15 parts of lauric acid, 8-14 parts of benzoic acid, 16-22 parts of phthalic anhydride, 6-10 parts of pentaerythritol, 9-15 parts of glycerol, 0.05-0.1 part of hypophosphorous acid, 0.05-0.1 part of 2,6-ditertiary butyl-4-methylphenol, 9-13 parts of xylene and 22-28 parts of ethyl acetate. According to the formula, a small amount of lauric acid, and large amounts of aromatic polybasic acids containing benzene ring structure (benzoic acid and phthalic anhydride) are added to the alkyd resin, so that the resin has high glass transition temperature; and in addition, excessive polybasic alcohols are added to the resin, so that the content of effective hydroxyl groups in the molecular structure of the resin is high.

Description

technical field [0001] The invention relates to the technical field of curing agents, in particular to high-hydroxyl alkyd resins used for preparing polyurethane curing agents, and a preparation method thereof. Background technique [0002] At present, some alkyd resin manufacturers use hydroxyl-containing alkyd resins for the manufacture of two-component modified polyurethane curing agents. Due to the addition of a large amount of saturated fatty acids, such as lauric acid, and aromatic hard monomer polyacids The addition amount is small, so that the glass transition temperature of this type of hydroxyl-containing alkyd resin itself is low; and the excess of polyhydric alcohol in the resin formula is small, so that the effective hydroxyl content in the molecular structure of the resin is low. Therefore, when using the existing hydroxyl-containing alkyd resin and the isocyanate monomer containing NCO group to add reaction under certain reaction conditions to generate a two-c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/47C08G18/42C09D175/06
Inventor 朱建锋
Owner CARPOLY CHEM GRP
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