High hydroxyl polyester resin for polyurethane elastic solidifying agent and preparation method thereof
A high hydroxyl polyester and polyurethane elasticity technology, applied in the resin field, can solve the problems of reducing NCO content, flexibility, reducing the reactivity of hydroxyl-containing paint components and flexibility of film-forming materials, etc. The effect of improving flexibility and high hardness
Active Publication Date: 2013-01-23
CARPOLY CHEM GRP
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Problems solved by technology
Therefore, when using this hydroxyl-containing alkyd resin to synthesize a two-component polyurethane curing agent, the effective NCO content of the two-component polyurethane curing agent is reduced, the flexibility is reduced, and the reactivity with the hydroxyl-containing paint component and the film-forming substance are reduced. flexibility
Method used
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[0048] 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.
[0049] It should be noted that: adipic acid, phthalic anhydride, glycerin, neopentyl glycol, ethylene glycol, hypophosphorous acid, dibutylhydroxytoluene, xylene, and ethyl acetate used in the following examples are all domestic industrial grades raw material.
[0050] The preparation process of following embodiment product is similar, only there is difference in the proportioning of raw material, and the steps that preparation process comprises are:
[0051] 1. Pre-pass N in a clean reactor 2 ↑5min (flow: 4m 3 / h);
[0052] 2. Add glycerin, ethylene glycol, neopentyl glycol, adipic acid, phthalic anhydride, hypophosphorous acid, BHT, xylene in sequence according to the formula, and then heat up the oil;
[0053] 3. ...
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Abstract
The invention discloses a high hydroxyl polyester resin for a polyurethane elastic solidifying agent and a preparation method thereof. The high hydroxyl polyester resin is prepared from the following raw materials in parts by weight: 10-18 parts of hexane diacid, 18-27 parts of phthalic anhydride, 9-15 parts of glycerol, 5-8 parts of neopentyl glycol, 5-8 parts of ethylene glycol, 0.05-0.2 part of hypophosphorous acid, 0.05-0.2 part of dibutyl hydroxy toluene, 9-13 part of dimethylbenzene and 22-28 parts of ethyl acetate. A molecular chain of the high hydroxyl polyester resin is in a long chain linear structure and has active hydroxyl groups with higher content, therefore, an addition reaction between the high hydroxyl polyester resin and an isocyanate monomer containing an NCO (isocyanate) group can be carried out under certain reaction conditions to generate the polyurethane elastic solidifying agent which contains the NCO group and has the molecular chain in the long chain linear structure.
Description
technical field [0001] The invention relates to the technical field of resins, in particular to high-hydroxyl polyester resins used for preparing polymeric polyurethane curing agents, and a preparation method thereof. Background technique [0002] At present, some enterprises that produce modified polyurethane curing agents generally use alkyd resins containing hydroxyl groups, and areocyanate monomers containing isocyanate groups (NCO groups) to react under certain conditions to form two-components containing active NCO groups. Modified polyurethane curing agent. Due to the need to add a large amount of monobasic saturated fatty acids, such as lauric acid, to the formula of this type of alkyd resin, and the amount of aromatic hard monomers containing a benzene ring structure is small, the glass transition temperature of the hydroxyl-containing alkyd resin itself is low, and the molecules Small, short molecular chain; and the polyol excess in this type of alkyd resin formul...
Claims
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IPC IPC(8): C08G63/20C08G18/42
Inventor 朱建锋
Owner CARPOLY CHEM GRP