Synthesis method of isocyanate curing agent
An isocyanate and synthesis method technology, applied in polyurea/polyurethane coatings, coatings, fire-retardant coatings, etc., can solve the problems of less obvious coupling effect, insufficient cross-linking strength of paint film, and short operating time, etc. Large market prospects and economic value, speed controllable, and the effect of improving high temperature resistance
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Embodiment 1
[0018] Embodiment 1 This embodiment discloses a kind of synthetic method of isocyanate curing agent, and described method step is as follows:
[0019] 1) Prepare a silicone-modified isocyanate with an NCO% (NCO% refers to the isocyanate group content in the polyisocyanate, ie the NCO content) of 8.6%.
[0020] Put aminopropyltriethoxysilane in a 250ml four-neck flask 110.5g, add diethyl maleate in a 250ml constant pressure dropper 86g, add diethyl maleate dropwise at room temperature, control the temperature below 45°C and add dropwise with nitrogen protection. After the dropwise addition, the temperature was raised to 70°C, and the material was kept for 48 hours to obtain a siloxane prepolymer with secondary amino groups.
[0021] (Reaction description: one molecule of aminopropyltriethoxysilane is added to one molecule of diethyl maleate to generate aspartic acid ester).
[0022] 2) Add 39.3g of the prepolymer to a 250ml constant pressure dropper, and add NCO%=21.7% h...
Embodiment 2
[0024] Embodiment 2 This embodiment discloses a kind of synthetic method of isocyanate curing agent, and described method step is as follows:
[0025] 1) Prepare a silicone-modified isocyanate with an NCO% (NCO% refers to the isocyanate group content in the polyisocyanate, ie the NCO content) of 12%.
[0026] Put 89.5g of aminopropyltrimethoxysilane into a 250ml four-neck flask, add 86g of diethyl maleate into a 250ml constant pressure dropper, add diethyl maleate dropwise at room temperature, and control the temperature at 50°C Add dropwise and protect with nitrogen. After the dropwise addition, the temperature was raised to 70° C., and the material was kept for 48 hours to obtain a siloxane prepolymer with secondary amino groups.
[0027] 2) Add 35.1g of the prepolymer to a 250ml constant pressure dropper, add 87.4g of hexamethylene diisocyanate trimer with NCO%=21.7% to a 250ml four-necked flask, and dropwise add prepolymer.
[0028] After dropping, the temperature was r...
Embodiment 3
[0029] Embodiment 3 This embodiment discloses a synthetic method of an isocyanate curing agent, and the steps of the method are as follows:
[0030] 1) Prepare a silicone-modified isocyanate with an NCO% (NCO% refers to the isocyanate group content in the polyisocyanate, ie the NCO content) of 8.5%.
[0031] Put 89.5g of aminopropyltrimethoxysilane into a 250ml four-neck flask, add 114g of dibutyl maleate into a 250ml constant pressure dropper, add dibutyl maleate dropwise at room temperature, and control the temperature at 50°C Add dropwise and protect with nitrogen.
[0032] After the dropwise addition, the temperature was raised to 70° C., and the material was kept for 48 hours to obtain a siloxane prepolymer with secondary amino groups.
[0033] 2) Add 101g of the prepolymer to a 250ml constant pressure dropper, add 145g of hexamethylene diisocyanate trimer with NCO%=21.7% to a 250ml four-necked flask, and add the prepolymer dropwise below 20°C body.
[0034] After drop...
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