Preparation method of high-solid hydroxyl resin

A hydroxyl resin, high solid technology, applied in coating, organic chemistry, fireproof coating, etc., can solve problems such as low hardness and slow drying speed of coating

Active Publication Date: 2020-10-27
QINGYUAN HUAYUAN INST OF SCI & TECH COLLABORATIVE INNOVATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the related art, after reducing the glass transition temperature and molecular weight of the resin at the same time, the drying speed of the coating prepared by the hydroxyl resin is slow and the final hardness is low

Method used

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  • Preparation method of high-solid hydroxyl resin

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preparation example Construction

[0025] Please refer to the attached figure 1 As shown, the present invention provides a kind of preparation method of high solid content hydroxyl resin, and this preparation method all comprises the following steps.

[0026] Step S1, preparing a reaction kettle, adding an antioxidant and triglycidyl isocyanurate into the reaction kettle, heating to 110-130° C. to melt the antioxidant and triglycidyl isocyanurate, Then stir the melted antioxidant and triglycidyl isocyanurate to make them evenly mixed.

[0027] Wherein, the antioxidant includes trinonylphenyl phosphite (i.e. antioxidant TNPP), tris[2.4-di-tert-butylphenyl] phosphite (i.e. antioxidant 168), tetrakis[β-( 3, at least one of 5-di-tert-butyl-4-hydroxyphenyl)propionic acid] pentaerythritol ester (i.e. antioxidant 1010), the triglycidyl isocyanurate refers to commercially available various industrial grades, electronic Grade triglycidyl isocyanurate.

[0028] Step S2, drop monobasic acid into the uniformly mixed ant...

Embodiment 1

[0035] The present embodiment provides a kind of preparation method of high solid content hydroxyl resin, and this preparation method all comprises the following steps:

[0036] Step S1, preparing a reaction kettle, adding 297.3g (ie 1mol) of triglycidyl isocyanurate and 3.0g of antioxidant TNPP into the reaction kettle, heating to 125°C so that the antioxidant TNPP and the Said triglycidyl isocyanurate melts, then stirs said antioxidant TNPP after melting and said triglycidyl isocyanurate makes it mix evenly;

[0037] Step S2, slowly drop 346.1 g (ie 2.4 mol) of isooctanoic acid into the homogeneously mixed antioxidant TNPP and the triglycidyl isocyanurate; keep the internal temperature of the reactor at 125° C., and Make the chemical reaction of the isooctanoic acid, the antioxidant TNPP and the triglycidyl isocyanurate for 4-6h;

[0038] Step S3, detecting the acid value inside the reactor after the chemical reaction occurs, if the acid value inside the reactor is less tha...

Embodiment 2

[0041] This embodiment provides a kind of preparation method of high solid content hydroxyl resin, and its steps are roughly the same as the steps of embodiment 1, and its difference is:

[0042] When performing step S1, the antioxidant added to the reactor is composed of 2.0 g of antioxidant TNPP and 2.0 g of antioxidant 168, heated to 120° C. to melt;

[0043] When performing step S2, the monobasic acid added is 185.0 g (2.5 mol) of propionic acid, and the internal temperature of the reactor is kept at 120° C.;

[0044] When carrying out step S3, the added solvent is 85.1 g of butyl acetate.

[0045] The high solid hydroxyl resin obtained by the above steps contains a triazine ring structure, its solid content is 85.0%, the hydroxyl content is 8.8% (based on solid), and its viscosity is 7200mPa·s (25°C). The high-solid hydroxyl resin, hexamethylene diisocyanate trimer, butyl acetate, dibutyltin dilaurate, and leveling agent are formulated into a varnish. The solid content o...

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Abstract

The invention provides a preparation method of high-solid hydroxyl resin. The preparation method comprises the following steps: preparing a reaction kettle, adding an antioxidant and triglycidyl isocyanurate into the reaction kettle, heating to 110-130 DEG C to melt, and stirring; dropwise adding monobasic acid into the antioxidant and the triglycidyl isocyanurate, wherein the molar ratio of the monobasic acid to the triglycidyl isocyanurate is 2.1: 1 to 3.0: 1; keeping the internal temperature of the reaction kettle at 110-130 DEG C, and carrying out chemical reaction on monobasic acid, the antioxidant and triglycidyl isocyanurate for 4-6 hours; detecting the acid value in the reaction kettle after the chemical reaction, and adding a solvent into the reaction kettle for dilution to form hydroxyl resin; cooling and filtering the hydroxyl resin to form a high solids hydroxyl resin. Compared with the prior art, the high-solid hydroxyl resin prepared by the preparation method is low in VOC content, high in drying speed and good in hardness.

Description

【Technical field】 [0001] The invention relates to the field of hydroxyl resins, in particular to a preparation method of high-solid hydroxyl resins. 【Background technique】 [0002] High-solid coatings are one of the varieties of low-volatile organic compounds (volatile organic compounds, VOC) environmentally friendly coatings, and they are also environmentally friendly coatings that the country is vigorously advocating for use. Compared with water-based coatings, high-solid coatings can not only greatly reduce VOC emissions, but also have better appearance, chemical resistance and better construction performance, and can be used without modification of the production line, so they are widely used in automobiles, Favored in the painting fields of buses, rail transit, and industrial equipment. [0003] In the related art, the glass transition temperature and the molecular weight of the resin are generally lowered at the same time to obtain a hydroxyl resin with a high solid c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D251/34C08G18/32C09D175/04
CPCC07D251/34C08G18/3853C09D175/04C09D5/18
Inventor 马晓阳汤汉良黎家强陈之善刘林羊陈君华李满林
Owner QINGYUAN HUAYUAN INST OF SCI & TECH COLLABORATIVE INNOVATION CO LTD
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