A kind of high closed cell rate melamine foam prepolymer and preparation method thereof
A closed-cell rate, prepolymer technology, applied in the field of high closed-cell rate melamine foam prepolymer and its preparation, can solve the problems of high closed-cell rate, high matching, limited range, etc., and achieve high closed-cell rate. Effect
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Embodiment 1
[0019] A kind of preparation method of high closed cell ratio melamine foam prepolymer, comprises the following steps:
[0020] 1) Add 100g of water, 135g of 37% formaldehyde solution, 50g of paraformaldehyde and 0.6g of hydrochloric acid into a 250ml three-neck flask, stir, and dissolve at 80°C for 20 minutes to obtain an aqueous solution of formaldehyde;
[0021] 2) Add 100g of the formaldehyde aqueous solution prepared in step 1) and 0.3g of sodium hydroxide into a 500ml three-necked flask. Under stirring conditions, add 50g of melamine at one time, stir, and react at 50°C for 1.5 h; add 6.5g of boric acid, 1g of Phenylboronic acid and 1g of boric acid ester were reacted at 60°C for 0.5 h; 0.8g of hexamethylenetetramine was added, stirred, reacted at 65°C for 30 minutes, and at 80°C for 5 minutes; after the reaction, added 0.8g of sodium tetraborate and cooled to At room temperature, the prepolymer of melamine foam with high closed cell rate is obtained.
[0022] The visco...
Embodiment 2
[0024] A kind of preparation method of high closed cell ratio melamine foam prepolymer, comprises the following steps:
[0025] 1) Add 100g of water, 50g of paraformaldehyde, 50g of paraformaldehyde and 0.8g of formic acid into a 250ml three-neck flask, stir, and dissolve at 90°C for 30min to obtain an aqueous solution of formaldehyde;
[0026] 2) Add 100g of formaldehyde aqueous solution and 0.3g of potassium hydroxide to a 500ml three-necked flask, and add 40g of melamine at one time under stirring conditions, and react at 55°C for 1.5 h; add 13.8g of boric acid, 1g Phenylboronic acid and 0.5g boric acid ester were reacted at 40°C for 1 h; 0.8g ammonia water was added, stirred, reacted at 70°C for 30 minutes, and reacted at 85°C for 5 minutes; after the reaction was completed, 1.2 g of sodium tetraborate was added and cooled to room temperature to obtain Prepolymer for closed cell melamine foam.
[0027] The viscosity of the prepared high-closed-cell melamine foam prepolyme...
Embodiment 3
[0029] A kind of preparation method of high closed cell ratio melamine foam prepolymer, comprises the following steps:
[0030] 1) Add 100g of water, 125g of 40% formaldehyde solution, 50g of paraformaldehyde and 0.6g of hydrochloric acid into a 250ml three-neck flask, stir, and dissolve at 85°C for 15 minutes to obtain an aqueous solution of formaldehyde;
[0031] 2) Add 100g of the formaldehyde aqueous solution prepared in step 1) and 0.3g of sodium hydroxide into a 500ml three-necked flask. Under stirring conditions, add 40g of melamine at one time, stir, and react at 45°C for 1 hour; add 2.25g of boric acid, 0.5g of Phenylboronic acid and 1g of boric acid ester were reacted at 50°C for 0.5 h; added 0.8g of hexamethylenetetramine, stirred, reacted at 65°C for 25 minutes, and reacted at 80°C for 10 minutes; after the reaction, added 0.3g of sodium tetraborate and cooled to At room temperature, the prepolymer of melamine foam with high closed cell rate is obtained.
[0032] ...
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