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Melamine foam prepolymer with high closed-cell percentage and preparation method thereof

A technology of prepolymer and closed cell rate, 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

Active Publication Date: 2017-04-26
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the type and amount of foaming agent remain unchanged, the curing rate can be changed by changing the type and amount of curing agent, but the range of changing the curing rate by changing the curing agent is limited. For a specific system, when the amount of curing agent After reaching a certain value, change the amount of curing agent, and the curing rate will no longer change greatly. Even if the type and amount of blowing agent are changed, it is difficult to make the two highly match, and it is not easy to obtain a foam material with a high closed cell rate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a melamine foam prepolymer with high closed-cell percentage and a preparation method thereof, and belongs to the technical field of polymer materials. A boron modifier is added during the preparation process of the melamine foam prepolymer. Hydroxymethyl functionality degree of the melamine foam prepolymer modified by the boron modifier is increased. Electron deficiency of boron increases dehydration and condensation activity of hydroxymethyl functional groups. In the foaming process of melamine resin, the melamine prepolymer modified by boron can react quickly. A polymer with high crosslinking density can be formed rapidly around cells formed by a foaming agent and the cells are stabilized and maintained so that melamine foam with high closed-cell percentage is prepared, and the closed-cell percentage of the melamine foam reaches 95% or above.

Description

technical field [0001] The invention relates to a melamine foam prepolymer with a high closed cell rate and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] Melamine formaldehyde foam, also known as melamine foam, is a thermosetting material with a three-dimensional network structure with an opening rate of more than 99%. The melamine foam with a high open cell ratio has internal cells connected by ribs and interpenetrates each other, so liquids such as water can easily enter the interior of the foam, and its water absorption rate is high, which is not conducive to the long-term use of the foam and reduces the service life of the foam. ; and a large number of open-pore structures inside the foam make the air convection serious, and its thermal conductivity is relatively large, making it difficult to be used as a thermal insulation material. [0003] In order to prepare thermal insulation foam materials with l...

Claims

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Application Information

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IPC IPC(8): C08G12/32C08K5/55
CPCC08G12/32C08K5/55
Inventor 马海红王雪帆宋聪强周正发徐卫兵任凤梅杨子征
Owner HEFEI UNIV OF TECH
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