Preparation of polyurethane curing agent with low free toluene diisocyanate

A technology of toluene diisocyanate and polyurethane curing agent, which is applied in the field of preparation of polyurethane curing agent, can solve the problems of unstable adducts and impracticality, and achieve the effects of good stability, unchanged paint film performance and low viscosity

Inactive Publication Date: 2003-06-18
SHENZHEN FEIYANG IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lower the feed ratio of NCO/OH, the lower the toluene diisocyanate monomer content of the final adduct, but the greater the visc

Method used

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  • Preparation of polyurethane curing agent with low free toluene diisocyanate

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] Example one:

[0026] In one equipped with a stirrer, thermometer and N 2 Add 325 grams of TDI and 295 grams of butyl acetate into a protected 1000ml four-necked flask. Heat and increase the temperature. Put 71 grams of trimethylolpropane and 43 grams of 2-octanol into the reaction in five batches at 65°C. Incubate for 4 hours and check the weight percentage of NCO. When it is 11.1%, the solid content is 60%. Cool down to 55°C, add 0.48 g of AC960-1, and keep the temperature between 50°C and 60°C. 1 hour, check the weight percentage of free NCO groups and free toluene diisocyanate once. When the weight percentage of NCO is 9.3% and the weight percentage of free toluene diisocyanate is 0.89%, immediately add 0.92 g of chlorine It can be discharged after cooling to 25℃.

Example Embodiment

[0027] Embodiment two:

[0028] In one equipped with a stirrer, thermometer and N 2 Add 318 grams of TBI and 420 grams of butyl acetate into a protected 1000ml four-necked flask. The temperature is raised to 60°C. 72 grams of trimethylolpropane and 31 grams of n-octanol are put into the reaction in five batches and kept at 70°C for 3 hours. , When the weight percentage of NCO is 9.5%, the solid content is 50%, the temperature is reduced to 60℃, 0.3g AC960-1 is added, the reaction is kept at 60℃, and NCO and free toluene diisocyanate are detected every 1 hour. When the weight percentage of NCO is 8.0% and the weight percentage of free toluene diisocyanate is 1.68%, immediately add 0.57 g of benzoyl chloride, and cool to 25°C. material. Embodiment three:

Example Embodiment

[0023] TDI: 2,4-toluene diisocyanate;

[0029] In one equipped with a stirrer, thermometer and N 2In a protected 1000ml four-neck flask, add 478 grams of TDI and 210 grams of ethyl acetate. The temperature is raised to 55°C, 110 grams of trimethylolpropane and 27 grams of 1-butanol are put into the reaction in six batches, and the reaction is kept at 65°C. 4 hours, when the weight percentage of NCO is 13.65%, the solid content is 75%. Cool down to 55°C, add 0.25 g of AC960-1, react at 50-60°C, check NCO every 1 hour And the weight percentage of free toluene diisocyanate. When the weight percentage of NCO is 11.6% and the weight percentage of free toluene diisocyanate is 0.95%, immediately add 0.53 g of benzoyl chloride and cool to 25 ℃, the material can be discharged.

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PUM

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Abstract

A low-free toluene diisocyanate as the solidifying agent of polyurethane is prepared from toluene diisocyanate, ester-type solvent, trihydroxymethyl propane, aliphatic compound, trimerizing catalyst of isocyanate, and trimerizing inhibitor of isocyanate through two-step reaction including addition reaction to obtain TDI/TMP. Its advantages are low viscosity and high stability.

Description

technical field [0001] The invention relates to a preparation method of a polyurethane curing agent. Background technique [0002] Common polyurethane curing agents in the market are adducts of toluene diisocyanate (TDI for short) and trimethylolpropane (TMP for short), referred to as TDI / TMP adducts. The reaction principle is to use the characteristics of the 4-NCO group on the benzene ring of toluene diisocyanate to have higher activity and faster reaction than the 2-NCO group to prepare TDI / TMP adducts, so that the 4-position NCO on the benzene ring is reserved. group to form a TDI / TMP adduct curing agent containing a certain free NCO group, the reaction formula is as follows (reaction of 3 molecules of toluene diisocyanate and 1 molecule of trimethylolpropane): This reaction is a one-step process. [0003] In order to be able to cure the prepolymer with -OH groups of resins such as polyester, polyether, alkyd, epoxy, acrylic, etc., it must contain a certain amount of ...

Claims

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Application Information

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IPC IPC(8): C08K5/29C08L75/04
Inventor 肖增钧邓锦新
Owner SHENZHEN FEIYANG IND CO LTD
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