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Phenol modified urea-formaldehyde foam and preparation method thereof

A technology for modifying urea-formaldehyde and phenol, which is applied in the field of phenol-modified urea-formaldehyde foam and its preparation, which can solve the problems of weak aging resistance, low stability, and poor water resistance, and achieve the effect of improved water resistance and good heat insulation performance

Active Publication Date: 2013-09-18
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 1933, a German company developed and researched "urea-formaldehyde foam" for the first time. After five years of research, it was successfully developed in 1938. After 1940, "urea-formaldehyde foam" was put into production by BASF in the Federal Republic of Germany. Due to the poor water resistance of urea-formaldehyde foam, Low stability, weak aging resistance and high formaldehyde release, so its application is limited

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  • Phenol modified urea-formaldehyde foam and preparation method thereof
  • Phenol modified urea-formaldehyde foam and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0065] Embodiment 1, preparation phenol modified urea-formaldehyde (PUF) resin

[0066] Mix 65 parts of formaldehyde solution with a mass percent concentration of 37% and 10 parts of phenol, adjust the pH value of the system to 8 with 2mol / L sodium hydroxide aqueous solution, raise the temperature to 75°C and keep it warm for 1.5 hours, then add the first batch of 11 parts of urea (55%), warming up to 85°C and insulated for 30 minutes;

[0067] Then lower the temperature to 70°C and add 7 parts (35%) of the second batch of urea, then raise the temperature to 98°C for 30 minutes, and then add 15% aqueous formic acid to adjust the pH value to 6 and react to the system When it is white and turbid, it reaches the end point;

[0068] Afterwards, quickly adjust the pH value to 8 with 2mol / L aqueous sodium hydroxide solution, then add 2 parts (10%) of the third batch of urea, rapidly cool down to 65°C, and keep the temperature for 50 minutes to obtain the phenol-modified urea-formal...

Embodiment 2

[0072] Embodiment 2, preparation phenol modified urea-formaldehyde (PUF) resin

[0073] According to the steps of Example 1, only 55 parts by mass of the formaldehyde solution with a mass percent concentration of 37% was replaced to obtain the phenol-modified urea-formaldehyde resin provided by the present invention.

[0074] The phenol-modified urea-formaldehyde resin has a viscosity of 24cp at 25°C, a water content of 45.9%, a solid content of 48.6%, a free phenol content of 4.90%, a free aldehyde content of 0.63%, and a pH value of 6.8.

Embodiment 3

[0075] Embodiment 3, preparation phenol modified urea-formaldehyde (PUF) resin

[0076] Mix 55 parts of formaldehyde solution with a mass percent concentration of 37% and 10 parts of phenol, adjust the pH value of the system to 7 with 2mol / L sodium hydroxide aqueous solution, raise the temperature to 70°C and keep it warm for 2 hours, then add the first batch of 11 parts of urea (55%), the temperature was raised to 100° C. and the heat preservation reaction was carried out for 15 minutes;

[0077] Then cool down to 60°C and add 7 parts (35%) of the second batch of urea, then raise the temperature to 100°C for 15 minutes of heat preservation reaction, then add a 15% formic acid aqueous solution to adjust the pH value to 5, and react to the system When it is white and turbid, it reaches the end point;

[0078] Afterwards, quickly adjust the pH value to 7 with 2mol / L aqueous sodium hydroxide solution, then add 2 parts (10%) of the third batch of urea, rapidly cool down to 50°C, ...

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Abstract

The invention discloses a phenol modified urea-formaldehyde foam and a preparation method thereof as well as application. The method comprises the following steps of: firstly, mixing formaldehyde with phenol for reaction to a certain extent under an alkaline condition, regulating the PH value of the system by using an alkaline liquor to an alkaline value, and then adding urea in batches according to process requirements, and carrying out a temperature-increased reaction, thereby obtaining white, thick phenol modified urea-formaldehyde resin; stirring a foam liquid diluted 5-15 times by a high-speed stirrer at a rate ranging from 1000 to 5000 r / min at a room temperature, and simultaneously, blasting compressed air of 0.1-0.4 MPa through an air compressor, stirring for 30-120 s, adding the prepared phenol modified urea-formaldehyde resin and continuously stirring for 30-60 seconds, and then rapidly transferring the stirred mixture into a die and curing for 24-48 hours at a temperature ranging from 35 to 55 DEG C, thereby obtaining white phenol modified urea-formaldehyde (PUF) foam. The PUF foam is characterized in that while the advantages of low light, high flame resistance, low heat conductivity, low cost and the like of the urea-formaldehyde foam are maintained, the introduction of a benzene ring structure is advantageous for improving the defects of poor waterproofness and the like of the urea-formaldehyde foam; and the product has good heat insulation performance.

Description

technical field [0001] The invention relates to a phenol-modified urea-formaldehyde foam and a preparation method thereof. Background technique [0002] Urea-formaldehyde resin is produced by polycondensation of urea and formaldehyde under acid or alkaline conditions. It is low in cost, light in color, high in hardness, oil-resistant, mildew-resistant, and has good insulation and temperature resistance. It is an earlier developed thermosetting resin. one. The urea-formaldehyde resin for foam is generally prepared under alkaline conditions, and the molar ratio of formaldehyde / urea is 1.5-2.0 to ensure that the resin can be thermally cured. In 1933, a German company developed and researched "urea-formaldehyde foam" for the first time. After five years of research, it was successfully developed in 1938. After 1940, "urea-formaldehyde foam" was put into production by BASF in the Federal Republic of Germany. Due to the poor water resistance of urea-formaldehyde foam, Low stabil...

Claims

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Application Information

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IPC IPC(8): C08G14/08C08J9/30C08L61/34
Inventor 赵彤郑鲲李昊王娟刘哲
Owner INST OF CHEM CHINESE ACAD OF SCI
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