Preparation method of sulfonate type water-based polyester-acrylic resin hybrid

A technology of acrylic resin and water-based polyester, applied in the field of coatings, can solve the problems of poor weather resistance and chemical resistance.

Pending Publication Date: 2021-05-18
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polyester coatings are widely used, with full coating film and excellent mechanical properties, but relatively poor weather resistance and chemical resistance

Method used

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  • Preparation method of sulfonate type water-based polyester-acrylic resin hybrid
  • Preparation method of sulfonate type water-based polyester-acrylic resin hybrid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1, the preparation of polyester intermediate

[0032] Add 62.00 g of isophthalic acid-5-sodium sulfonate, 48.00 g of neopentyl glycol, and 0.200 g of catalyst into a four-necked flask with a stirrer, condenser, water separator, thermocouple and nitrogen inlet. Nitrogen protection, heat up to 160°C for 2 hours, then raise the temperature by 10°C every 0.5h, collect distillates in the water separator until the temperature reaches 200-210°C, keep warm, take samples regularly to measure the acid value, when the acid value drops to 0-5mgKOH / g to stop the reaction, pour the mixed material into a mortar while hot and grind it to powder, and store it under dry conditions to obtain a polyester intermediate.

[0033] Step 2, the synthesis of water-based unsaturated polyester

[0034] Under the protection of nitrogen, 18.00g polyester intermediate, 8.200g neopentyl glycol, 1.900g trimethylolpropane, 6.200g 2-butyl-2 ethyl-1,3-propanediol, 4.600g Phthalic anhydride, 1.390 g...

Embodiment 2

[0038] Step 1, the preparation of polyester intermediate

[0039] Add 62g of isophthalic acid-5-sodium sulfonate, 41.64g of 1,4-butanediol, and 0.0200g of catalyst in a four-necked flask with agitator, condenser, water separator, thermocouple and nitrogen inlet, Introduce nitrogen protection, heat up to 160°C for 2 hours, then raise the temperature by 10°C every 0.5h, collect fractions in the water separator until the temperature reaches 200-210°C, keep warm, take samples regularly to measure the acid value, when the acid value drops to 0 The reaction is stopped at ~5mgKOH / g, and the mixed material is poured into a mortar while it is hot and ground to powder, and stored under dry conditions to obtain a polyester intermediate.

[0040] Step 2, the synthesis of sulfonate type water-based unsaturated polyester

[0041]Under the protection of nitrogen, 30.00g polyester intermediate, 1.900g trimethylolpropane, 6.200g 2-butyl-2 ethyl-1,3-propanediol, 4.600g phthalic anhydride, 1.39...

Embodiment 3

[0045] Step 1, the preparation of polyester intermediate

[0046] Add dimethyl isophthalate-5-sodium sulfonate 62.00g, 1,6-hexanediol 54.60g in the four-necked flask with stirrer, condenser, water separator, thermocouple and nitrogen inlet, Catalyst 0.200g, nitrogen protection, heat up to 160°C for 2 hours, then raise the temperature by 10°C every 0.5h, collect fractions in the water separator until the temperature reaches 200-210°C, keep warm, take samples regularly to measure the acid value, when the acid When the value drops to 0-5mgKOH / g, the reaction is stopped, and the mixed material is poured into a mortar while it is hot, and ground to powder, and stored in a dry condition to obtain a polyester intermediate.

[0047] Synthesis of step disulfonate type water-based unsaturated polyester

[0048] Under the protection of nitrogen, 18.00g polyester intermediate, 9.300g1, 6-hexanediol, 1.900g trimethylolpropane, 6.200g 2-butyl-2 ethyl-1,3-propanediol, 4.600 g of phthalic a...

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Abstract

The invention discloses a preparation method of a sulfonate type water-based polyester-acrylic resin hybrid. The preparation method comprises the following steps: adding obtained sulfonate type water-based unsaturated polyester into a reactor, and heating to 90-140 DEG C; uniformly mixing an acrylic monomer and an initiator, filling the mixture into a dropping funnel, dropwise adding the mixture into the reactor at a constant speed for 2-5 hours, and then carrying out heat preservation reaction for 0.5-2 hours; supplementing a small amount of initiator and solvent to improve the conversion rate and adjust the solid content to 70wt%, keeping the temperature for 1-3 hours, cooling, measuring the acid value, and keeping the acid value at 0-5mgKOH / g; and adding deionized water for high-speed dispersion, adjusting the solid content to 30-40wt%, filtering with a 400-mesh nylon net, and discharging to obtain the aqueous dispersion of the sulfonate type water-based polyester-acrylic resin hybrid. According to the invention, the sulfonate group in the unsaturated polyester chain provides hydrophilicity, and the use of amine neutralizers is reduced, so that the purposes of energy conservation and emission reduction are achieved. Meanwhile, the compatibility of the two is optimal, the heat storage stability and the water resistance are excellent, and the heat storage stability can reach 14 days or above.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a preparation method of a sulfonate-type water-based polyester-acrylic resin hybrid. Background technique [0002] Polyester-based coatings are widely used, with full coating film and excellent mechanical properties, but relatively poor weather resistance and chemical resistance. Acrylic-based coatings have excellent lightfastness, outdoor aging performance and chemical corrosion resistance, etc. Modification of unsaturated polyester with acrylic resin can achieve the advantages of both, and also has the advantage of reducing costs. [0003] In recent years, in order to meet the requirements of relevant environmental protection standards at home and abroad, water-based polyester resins have been widely developed, but it is difficult for the domestically developed water-based polyester resins to be widely used in industry. The preparation method of ester resin mainl...

Claims

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Application Information

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IPC IPC(8): C08F283/01C08F220/14C08F220/20C08F220/18C08F212/08C09D175/04C09D7/20C08G18/63
CPCC08F283/01C09D175/04C09D7/20C08G18/635
Inventor 闫福安许洋周勇
Owner WUHAN INSTITUTE OF TECHNOLOGY
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