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A kind of anti-hydrolysis water-soluble polyester coating composition and preparation method thereof

A technology of water-soluble polyester and composition, applied in the field of polymers, can solve the problems of etherification side reaction, side reaction, low solid content of sulfonate, etc., to improve water resistance, reduce the possibility of fracture, and improve water resistance sexual effect

Active Publication Date: 2021-05-14
中瀚新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Generally, the carboxylic acid type uses multifunctional monomers such as: dimethylolpropionic acid, trimellitic anhydride, etc. to synthesize and introduce a large number of carboxyl groups, but these functional groups have relatively high requirements for reaction conditions in the process of preparing polyester, and may occur Side reaction, resulting in gelation of the product
The molecular weight of the product is generally very low, below 5000, and because the carboxyl group is close to the ester bond, the product is easily hydrolyzed and has poor water resistance
[0005] Sulfonate polyesters can obtain polyester resins with higher molecular weight, but due to the strong ion effect of sulfonate, the melt viscosity of the melt is particularly high during the synthesis process, which requires high equipment, and the sulfonate The salt monomer is acidic, which leads to serious side reactions in the reaction process, and a large number of etherification side reactions will occur, which will have a great impact on industrial synthesis control and subsequent use of products
At the same time, there are many factors affecting the solubility of sulfonate polyesters, and the solid content is low.
[0006] In summary, carboxylic acid products have low molecular weight, low cohesion, and poor water resistance
The sulfonate product has low solid content, many side reactions, and poor product stability.
As a result, the existing water-based polyesters are greatly limited in the application of coatings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Synthesis of Waterborne Polyester Resin

[0026] 4kg 2-methylene-4-phenyl-1,3-dioxolane, 1.4kg 2-methylene-1,3-dioxetane, 2.4kg maleic anhydride, 5.9kg methyl Butyl acrylate and 16g of initiator azobisisobutyronitrile were dissolved in 50L of toluene, added into the reaction kettle, mixed evenly, and then heated to 60-70°C for 2 hours under the protection of nitrogen. Precipitation and purification with n-hexane, and vacuum drying to obtain epoxy-modified polyester resin.

[0027] Preparation of water-based paint:

[0028] Dissolve the obtained water-based polyester in water with a solid content of 40%, then add triethylamine to neutralize to a pH of 6-8, then add a leveling agent (BYK381) with a mass of 0.2% of the resin solution, and a leveling agent with a mass of 0.1% of the resin solution Antifoaming agent (BYK031), curing agent (Bayhydur305) with 5% resin solution mass, after mixing evenly, the product is obtained.

Embodiment 2

[0030] Synthesis of Waterborne Polyester Resin

[0031] 5.7kg 2-methylene-4-phenyl-1,3-dioxolane, 1.7kg 2-methylene-1,3-dioxetane, 1.5kg maleic anhydride, 8.9kg formaldehyde Butyl acrylate and 16g of initiator azobisisobutyronitrile were dissolved in 50L of toluene, added into the reaction kettle, mixed evenly, and heated to 60-70°C for 2 hours under the protection of nitrogen. Precipitation and purification with n-hexane, and vacuum drying to obtain epoxy-modified polyester resin.

[0032] Preparation of water-based paint:

[0033] Dissolve the obtained water-based polyester in water with a solid content of 40%, then add triethylamine to neutralize to a pH of 6-8, then add a leveling agent (BYK381) with a mass of 0.2% of the resin solution, and a leveling agent with a mass of 0.1% of the resin solution Antifoaming agent (BYK031), curing agent (Bayhydur305) with 5% resin solution mass, after mixing evenly, the product is obtained.

Embodiment 3

[0035] Synthesis of Waterborne Polyester Resin

[0036] 5.7kg 2-methylene-4-phenyl-1,3-dioxolane, 1.7kg 2-methylene-1,3-dioxetane, 1.5kg maleic anhydride, 8.9kg formaldehyde Lauryl acrylate and 16g of initiator azobisisobutyronitrile were dissolved in 50L of toluene, added to the reaction kettle, mixed evenly, and then heated to 60-70°C for 2 hours under the protection of nitrogen. Precipitation and purification with n-hexane, and vacuum drying to obtain epoxy-modified polyester resin.

[0037] Preparation of water-based paint:

[0038] Dissolve the obtained water-based polyester in water with a solid content of 40%, then add triethylamine to neutralize to a pH of 6-8, then add a leveling agent (BYK381) with a mass of 0.2% of the resin solution, and a leveling agent with a mass of 0.1% of the resin solution Antifoaming agent (BYK031), curing agent (Bayhydur305) with 5% resin solution mass, after mixing evenly, the product is obtained.

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Abstract

The invention provides a hydrolysis-resistant water-soluble polyester coating composition and a preparation method thereof. The coating consists of 2-methylene-4-phenyl-1,3-dioxolane, 2-methylene ‑1,3‑Dioxetane, unsaturated acid, and other acrylic monomers are polymerized, neutralized, and mixed with paint additives. The main chain of the water-soluble polyester in the present invention contains many ester bonds, which can provide adhesion to substrates such as metal, PET, and paper. At the same time, the large benzene ring next to the ester bond provides steric protection and strength, which can well protect the ester bond and improve water resistance. The more carboxyl groups in the resin structure are not directly connected to the ester bond. Compared with ordinary polyester, it reduces the possibility of breaking the ester bond when it is attacked, and can further improve the water resistance of the product.

Description

technical field [0001] The invention belongs to the technical field of macromolecules, and in particular relates to a hydrolysis-resistant water-soluble polyester coating composition and a preparation method thereof. Background technique [0002] Polyester refers to a polymer compound containing a large number of ester bonds on the main chain of a macromolecule, which is formed by direct esterification or transesterification of a dibasic (or polybasic) acid (or its ester) and a dibasic (or polybasic) alcohol. One of the synthetic resins with excellent comprehensive properties. Water-based polyester is a new type of water-soluble polymer, which introduces ionic structural units into the molecular structure. The ionic functional group provides polyester with water solubility and also brings hygroscopicity and ionic conductivity. [0003] Currently commonly used water-based polyesters are mainly divided into two types, one is the carboxylic acid type, which is obtained by firs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D133/10C08F220/18C08F222/06
CPCC08F220/18C09D133/10
Inventor 宁珅许峰付静童军
Owner 中瀚新材料科技有限公司