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Low-free-TDI (toluene diisocyanate) polyurethane polyester curing agent and preparation method thereof

A polyurethane, low-free technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of expensive equipment, large solvent consumption, complicated operation, etc., achieve good film-forming performance and wide application, reduce pollution Harmful and economical effects

Active Publication Date: 2015-04-29
ZHEJIANG TIANNU GROUP PAINT MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods of removing free monomers are roughly divided into three types, molecular distillation, solvent extraction and chemical catalysis, the first two of which are physical methods, the advantages of which are the low viscosity of the curing agent after treatment, which is convenient for construction and relatively long storage period And the removal of free monomers is thorough, but the disadvantages are expensive equipment, complicated operation, long production cycle and large solvent consumption, which are rarely used in domestic industries

Method used

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  • Low-free-TDI (toluene diisocyanate) polyurethane polyester curing agent and preparation method thereof
  • Low-free-TDI (toluene diisocyanate) polyurethane polyester curing agent and preparation method thereof
  • Low-free-TDI (toluene diisocyanate) polyurethane polyester curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A kind of low free TDI polyurethane polyester resin curing agent described in the present embodiment, it is made of containing weight ratio 14.53g polyester resin, 0.98g trimethylolpropane, 3.66g neopentyl glycol, 0.05g phosphoric acid, 0.26gK54, 0.3g ethanol, 24g toluene diisocyanate, 0.5g phosphorous acid and 60g butyl acetate.

[0018] A kind of preparation method of low free TDI polyurethane polyester resin curing agent is: with 0.98g trimethylol propane, 3.66g neopentyl glycol, 14.53g polyester resin, 0.5g phosphorous acid, 0.3g ethanol, 24.0g toluene Mix diisocyanate and 60g butyl acetate into the pot, dehydrate under reduced pressure for 0.5h, heat up to 58°C, keep warm for 1 hour, cool down to 55°C, then add 0.03g phosphoric acid, 0.2g K54, heat up to 60°C and keep the temperature. After keeping warm for 4 hours, take samples to measure viscosity, NCO and TDI, continue to keep warm until the TDI content is 2.0%, add the remaining 0.06g K5 after cooling down, kee...

Embodiment 2

[0023] A kind of low free TDI polyurethane polyester resin curing agent described in the present embodiment, it is made of containing weight ratio 14.53g polyester resin, 1.96g trimethylol propane, 2.53g neopentyl glycol, 0.05g phosphoric acid, 0.26gK54, 0.3g ethanol, 24g toluene diisocyanate, 0.5g phosphorous acid and 60g butyl acetate.

[0024] A kind of preparation method of low free TDI polyurethane polyester resin curing agent is: with 1.96g trimethylol propane, 2.53g neopentyl glycol, 14.53g polyester resin, 0.5g phosphorous acid, 0.3g ethanol, 24.0g toluene Mix diisocyanate and 60g butyl acetate into the pot together, dehydrate under reduced pressure for 0.5h, heat up to 58°C, keep warm for 1 hour, cool down to about 55°C, add 0.03g phosphoric acid, 0.2gK54, heat up to 60°C, keep warm After 4 hours, take samples to measure viscosity, NCO, and TDI, continue to keep warm until the TDI content is 3%, cool down and add 0.06g K54, keep warm at 62°C until the measured free TD...

Embodiment 3

[0029] A kind of low free TDI polyurethane polyester resin curing agent described in the present embodiment, it is made of containing weight ratio 29.06g polyester resin, 0.98g trimethylol propane, 2.83g neopentyl glycol, 0.05g phosphoric acid, 0.26gK54, 0.3g ethanol, 24g toluene diisocyanate, 0.5g phosphorous acid and 68g butyl acetate.

[0030] A kind of preparation method of low free TDI polyurethane polyester resin curing agent is: with 0.98g trimethylol propane, 2.83g neopentyl glycol, 29.06g polyester resin, 0.5g antioxidant, 0.3g dehydrating agent, 24.0 Put gTDI and 68g of butyl acetate into the pot together, after dehydration under reduced pressure for 0.5h, heat up to 58°C, keep warm for 1 hour, cool down to about 55°C, add 0.03g phosphoric acid, 0.2gK54, heat up to 60°C and keep warm for 4 Hours later, take samples to measure viscosity, NCO, and TDI, continue to keep warm until the TDI content is 2%, cool down and add 0.06g K54, keep warm at 62°C until the measured f...

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Abstract

The invention discloses a low-free-TDI (toluene diisocyanate) polyurethane polyester curing agent and a preparation method thereof. The invention aims to provide a low-free-TDI polyurethane polyester resin curing agent with better film forming property and lower environmental pollution hazards, of which the free TDI content is less than 0.15% after paint preparation, and a preparation method thereof. The curing agent is composed of the following components in percentage by weight: 12.5-16.5% of polyester resin, 3.5-5.5% of polyalcohol, 20-25% of TDI, 0.3-0.7% of antioxidant, 0.2-0.6% of dehydrating agent, 0.05-0.15% of polymerization inhibitor, 0.15-0.45% of trimer catalyst and 58-65% of solvent, totaling 100%. The polyester resin is composed of 6-10% of bean oil acid, 15-19% of castor oil, 19-23% of rosin, 15-18% of phthalic anhydride, 15-18% of glycerol, 0.25-0.65% of antioxidant and 16-20% of xylene, totaling 100%.

Description

technical field [0001] The invention relates to a low-free TDI polyurethane polyester resin curing agent and a preparation method thereof. Background technique [0002] Polyurethane curing agent is mostly used in combination with other resins in the form of two components. Usually polyurethane exists in the form of curing agent prepolymer; when used, the curing agent and hydroxyl resin are mixed, and cross-linked and cured at room temperature or high temperature to form membrane. [0003] The main hazards of free TDI to the human body are sensitization and irritation, irritant to the eyes, and symptoms of cough and asthma after respiratory inhalation. Free TDI is an important environmental indicator of polyurethane coatings. With the continuous enhancement of social environmental protection awareness, the content of free TDI is becoming more and more stringent. At present, the methods of removing free monomers are roughly divided into three types: molecular distillation, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/79C08G18/76C08G18/68C09D175/14
CPCC08G18/092C08G18/683C08G18/794C09D175/14C08G2115/02
Inventor 姚飞杨立峰庄国强姚莉
Owner ZHEJIANG TIANNU GROUP PAINT MFG
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