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Biomass polyacid modified polyester resin and preparation method thereof

A technology of modifying polyester and polyacid, applied in polyester coatings, coatings, anti-corrosion coatings, etc., can solve the problems of small molecular weight and simple structure, improve acid and alkali resistance and water resistance, and improve impact strength and toughness, good aging resistance effect

Pending Publication Date: 2021-06-18
安庆瑞泰化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, in patent CN 110396182 A, polybasic acids and polyhydric alcohols from bio-based materials are combined with 7-oxabicyclo[2.2.1]heptane-2,3-dicarboxylic anhydride, isosorbide, and 1,3-propanediol Copolymerization is carried out under the protection of a nitrogen atmosphere, and a polyester with a higher glass transition temperature and resistance is synthesized. Another example is the patent CN 1071236234 A through bio-based polyacids, including itaconic acid, succinic acid, and furandicarboxylic acid. et al. synthesized a bio-based polyester for powder coatings with good storage performance, good leveling performance, and excellent mechanical properties with polyols and acidolytic agents. Simple, can only improve a certain performance of polyester

Method used

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  • Biomass polyacid modified polyester resin and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0020] In the present embodiment, prepare materials: get 100 parts by weight of oleic acid dimer acid monomer, 10 parts by weight of ethylene glycol monomer, an appropriate amount of dibutyltin dilaurate and 100 parts by weight of xylene solvent, a pH regulator and an appropriate amount of cooling water, Synthesized as follows:

[0021] 1) The reaction kettle is ventilated with nitrogen and preheated;

[0022] 2) Add alcohol monomer, acid monomer, solvent and catalyst in sequence, raise the temperature to 120 degrees, and keep it warm for 1 hour;

[0023] 3) Heat up to 230 degrees again, keep warm until the solution is transparent;

[0024] 4) Add a pH regulator to neutralize the remaining acid, cool down and add water, cool and discharge.

Embodiment 2

[0026] The difference between the biomass polyacid-modified polyester resin in this example and Example 1 is that in this example, oleic acid dimer acid is replaced with oleic acid trimer acid.

Embodiment 3

[0028] The difference between the biomass polyacid-modified polyester resin in this example and that in Example 1 is that in this example, the polyol monomer ethylene glycol is replaced with propylene glycol.

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Abstract

The invention discloses biomass polyatomic acid modified polyester resin and a preparation method thereof, and the biomass polyatomic acid modified polyester resin comprises the following components: 100 parts by weight of an acid monomer, 10-30 parts by weight of an alcohol monomer, 1-5 parts by weight of a catalyst, 100-200 parts by weight of a solvent, 1-5 parts by weight of a pH regulator and 100-200 parts by weight of water. The bio-based polybasic acid used in the present invention is the dimer acid or trimer acid of oleic acid. Compared with the traditional micromolecular bio-based polybasic acid, the long main chain can improve the mechanical properties such as impact strength and toughness of a polyester paint film, the long alkyl side chain can improve the acid and alkali resistance and water resistance of the paint film, and the introduced unsaturated double bonds can provide more crosslinking points, so that the crosslinking strength of the resin is improved. The biomass polybasic acid is synthesized through oleic acid, acid monomers generally including phthalic anhydride, terephthalic acid, trimellitic anhydride and the like used in traditional polyester resin are replaced, no unsaturated aromatic ring structure is contained, and good aging resistance is achieved.

Description

technical field [0001] The invention mainly relates to the technical field of coating resin synthesis, in particular to a biomass polyacid-modified polyester resin and a preparation method thereof. Background technique [0002] Polyester resin is a polymer compound with ester bonds and double bonds formed by polycondensation of unsaturated dibasic acids (anhydrides) and saturated dibasic acids (anhydrides) and diols. It has the advantages of good mechanical properties, excellent corrosion resistance, rapid curing and molding at room temperature, and the synthesis process is relatively simple and the price is low. However, its products also have the disadvantages of being hard and brittle, and the impact strength is not high, especially the aging resistance of aromatic polyester is not good, which limits its application to a certain extent, so it is very important to modify it. necessary. [0003] Most biomass polyacids are a mixture of oligomers formed by the addition and ...

Claims

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Application Information

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IPC IPC(8): C08G63/52C09D167/06C09D5/08
CPCC08G63/52C09D167/06C09D5/08
Inventor 胡善君王景军
Owner 安庆瑞泰化工有限公司
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