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Mixed prepolymer of solidifying agent methyl diphenylene diisocyanate and 1,6-hexamethylene diisocyanate and its preparation method

A technology of hexamethylene diisocyanate and diphenylmethane, which is applied in the field of adhesive curing agent prepolymer and its preparation, polyurethane coatings, and can solve the problems of complex manufacturing process and low yield

Inactive Publication Date: 2012-01-11
FOSHAN JINGXIN HUIMING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, HDI is made into biuret triisocyanate and HDI trimer in foreign countries. These two HDI prepolymers have high strength and are non-toxic and pollution-free when used, but their manufacturing process is very complicated. The efficiency is low, and it is necessary to use expensive thin film evaporation equipment to recover excessive HDI. At present, the technical level of the domestic polyurethane manufacturing industry is still difficult to manufacture them, mainly relying on imports. Many scientific research units and enterprises are exploring the relatively simple processing of HDI prepolymers. method

Method used

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  • Mixed prepolymer of solidifying agent methyl diphenylene diisocyanate and 1,6-hexamethylene diisocyanate and its preparation method
  • Mixed prepolymer of solidifying agent methyl diphenylene diisocyanate and 1,6-hexamethylene diisocyanate and its preparation method
  • Mixed prepolymer of solidifying agent methyl diphenylene diisocyanate and 1,6-hexamethylene diisocyanate and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] a. Add 100 grams of molten MDI-100 and 100 grams of ethyl acetate in the No. 1 reaction kettle, stir evenly, heat up to 65°C, add 30 grams of polyε-caprolactone diol dehydrated by vacuum, at 65 React at ~75°C for 2 hours to obtain the modified MDI; b. Add 180 grams of HDI and 100 grams of ethyl acetate to the No. For ester diol, stir coldly at room temperature for 1.5 hours, raise the temperature to 70-80°C for 2 hours, and react for 1 hour at 85-90°C to obtain HDI modified products; lower the temperature of the material to below 70°C, add 57 A mixed solution composed of 1 gram of trimethylolpropane and 50 grams of ethyl acetate was reacted below 70°C for 3 hours, at 70-80°C for 2 hours, and at 85-95°C for 1 hour to obtain a HDI prepolymer; c , Then lower the temperature of the material in the No. 2 reactor to below 70°C, add the MDI modified product made in the No. 1 reactor, react at 70-80°C for 2 hours, react at 80-90°C for 1.5 hours, and cool down to 60°C; D, add 3...

Embodiment 2

[0059] a. Add 110 grams of melted MDI-100 and 60 grams of ethyl acetate into the No. 1 reaction kettle, stir evenly, heat up to 70°C, add 40 grams of polycarbonate diol that has been dehydrated in a vacuum, and heat it at 70-80°C React for 2 hours at 80-90°C for 1 hour to obtain a modified MDI; b. Add 250 grams of HDI and 60 grams of butanone to the No. 2 reactor, stir well, and add 80 grams of dehydrated MDI Polycarbonate diol, cold stirring at room temperature for 1 hour, heating up to 60-70°C for 2 hours, 80-90°C for 2.5 hours to obtain HDI modified products; lower the temperature of the material to below 70°C, Add a mixture of 64 grams of trimethylolpropane and 50 grams of ethyl acetate, react below 70°C for 2 hours, react at 70-75°C for 3 hours, and react at 80-90°C for 1 hour to obtain HDI prepolymer ; c, then lower the material temperature of the No. 2 reactor to below 70°C, add the MDI modified product made from the No. 1 kettle, react at 65-75°C for 3 hours, react at ...

Embodiment 3

[0062] a. Add 210 grams of melted MDI-100 and 80 grams of ethyl acetate into the No. 1 reactor, stir well, heat up to 75°C, add 60 grams of alkyd resin dehydrated by vacuum, and react at 70-80°C 1.5 hours, react at 85-95°C for 1 hour to obtain modified MDI; b. Add 90 grams of HDI and 30 grams of cyclohexanone into the No. 2 reaction kettle, stir evenly, and add 20 grams of alcohol dehydrated by vacuum Acid resin, cold stirring at room temperature for 0.5 hours, heated to 65-75°C for 2 hours, 80-90°C for 3 hours to obtain HDI modified product; lower the temperature of the material to below 70°C, add 48 grams A mixed solution composed of trimethylolpropane and 33 grams of ethyl acetate was reacted below 70°C for 4 hours, at 65-75°C for 1 hour, and at 80-90°C for 1 hour to obtain a HDI prepolymer; c, Then lower the material temperature of the No. 2 reactor to below 70°C, add the MDI prepolymer made from the No. 1 reactor, react at 65-75°C for 3 hours, react at 85-95°C for 1.5 hou...

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Abstract

The invention relates to a curing agent compound prepolymer composed of diphenylmenthane diisocyanate and 1, 6-hexamethylene diisocyanate and a preparation method thereof. The method comprises the following steps: MDI and an organic solvent are added and heated to 65 DEG C, polybasic alcohol is added and reacts with the mixture for 2 hours to 4 hours to obtain an MDI modifier; HID, an organic solvent and polybasic alcohol are added, heated and react for 2 hours to 5 hours, then the temperature is reduced below 70 DEG C, a TMP and organic solvent mixture is added, reaction at 70 DEG C lasts for 1 hour to 4 hours and 1 hour to 4 hours when the temperature is between 60 DEG C and 100 DEG C so as to obtain an HDI-MDI compound prepolymer curing agent. The method mixes and pre-polymerizes MDI and HDI, integrates the excellent performance of the two, produces a series of polyurethane curing agents with wide application range, high strength, good yellow-changing resistance, high curing speed,low toxicity, good storage stability and high solid content and has simple production technique.

Description

technical field [0001] The invention relates to a polyurethane coating, an adhesive curing agent prepolymer and a preparation method thereof, in particular to a diphenylmethane diisocyanate and 1,6-hexamethylene diisocyanate mixed prepolymer and a preparation method thereof. Background technique [0002] Polyurethane materials have many advantages and are used more and more widely in various industries. Toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI) and hexamethylene diisocyanate (HDI) are isocyanates with different structures. They each endow products with different properties and play unique advantages in different application fields. There are certain limitations of use. TDI and MDI belong to aromatic isocyanate, the NCO group is directly connected to the benzene ring, and it is easy to form a quinone-type chromogenic group under ultraviolet irradiation. Its itself and its polyurethane products will yellow when exposed to natural light for a long time. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/10C08G18/76C09D175/04
Inventor 周建明何绍群
Owner FOSHAN JINGXIN HUIMING TECH CO LTD
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