Preparation method of polyurethane curing agent intermediate and curing agent
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A technology of polyurethane curing agent and intermediate, which is applied in the field of polyurethane materials and can solve problems such as poor compatibility
Active Publication Date: 2016-09-21
JIANGMEN SANMU CHEM
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Problems solved by technology
[0006] The technical problem to be solved by the present invention is to provide an intermediate for polyurethane curing agent, which can obviously improve the problem of poor compatibility when used in coatings, and improve the flexibility, tolerance and gloss of coatings. At the same time, the intermediate for polyurethane curing agent Abundant raw materials and low production costs
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Embodiment 1
[0024] A kind of intermediate for polyurethane curing agent, its composition component is as follows by mass percentage:
[0025]
[0026] The preparation method of the intermediate for the polyurethane curing agent of this embodiment:
[0027] Step 1, venting nitrogen, first putting the liquid material glycerin, hypophosphorous acid and refluxed xylene into the reaction kettle successively, and then dropping into the solid material dodecanoic acid, benzoic acid, phthalic anhydride, pentaerythritol;
[0028] Step 2, start to heat up slowly, and turn on the reflux cooling water, when most of the materials melt, start stirring, continue to heat up after the stirring starts, and stop nitrogen after the reflux is stable;
[0029] Step 3: Slowly increase the reaction temperature to 190°C, and at a reaction temperature of 190°C to 215°C, reflux esterification for 2 hours and then take a sample to titrate the solid acid value. When the solid acid value is 2.0-3.0mgKOH / g, blow nitr...
Embodiment 2
[0031] A kind of intermediate for polyurethane curing agent, its composition component is as follows by mass percentage:
[0032]
[0033] The preparation method is the same as in Example 1.
Embodiment 3
[0035] A kind of intermediate for polyurethane curing agent, its composition component is as follows by mass percentage:
[0036]
[0037] The preparation method is the same as in Example 1.
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Abstract
The invention discloses a polyurethane curing agent intermediate, which comprises the following components by mass percentage: 21%-26.74% of phthalic anhydride, 5.93%-9.21% of benzoic acid, 0%-20.19% of dodecanoic acid, 0%-25.84% of hexadecanoic acid, 0%-10.01% of pentaerythritol, 0.16%-0.18% of hypophosphorous acid, 20.19%-26.00% of glycerol, 8.01%-25.83% of xylene, and 0%-19.69% of ethyl acetate. The invention also discloses a making method of the intermediate and a polyurethane curing agent made from the intermediate. The polyurethane curing agent intermediate provided by the invention uses alcohol glycerin or pentaerythritol to substitute active TMP, the reaction is mild and easy to control, dodecanoic acid or hexadecanoic acid of monacid is employed to substitute part of phthalic anhydride, in the synthesis process the reaction speed can be effectively controlled, the free TDI content can be lowered, and the solubility and gloss of the intermediate can be improved.
Description
technical field [0001] The invention relates to the field of polyurethane materials, in particular to an intermediate for a polyurethane curing agent and a preparation method thereof, and also relates to a curing agent made from the intermediate for a curing agent and a preparation method thereof. Background technique [0002] Polyurethane coatings have excellent performance and have rapidly become the most important and widely used coating varieties since their birth. Widely used in various coating fields, polyurethane coatings are widely used as automotive coatings, wood coatings, architectural exterior wall coatings, and metal anti-corrosion coatings. [0003] The paint film of polyurethane coatings has the advantages of high hardness, good flexibility, strong wear resistance and chemical resistance, and fast drying. Therefore, polyurethane is developing rapidly in China and is one of the important varieties of solvent-based coatings. Polyurethane coatings have always be...
Claims
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