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Method for developing low-density high-strength phenolic foam

A phenolic foam, high-strength technology, applied in the field of building exterior wall materials, can solve problems such as brittleness, ineffective toughening effect of phenolic foam, and limited application range of phenolic foam

Inactive Publication Date: 2017-07-25
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, phenolic resin also has fatal shortcomings: brittle, easy to slag, low strength, etc.
At present, there are many phenolic foam manufacturers in China, but the phenolic foam insulation boards produced by these manufacturers generally have problems such as high brittleness, poor mechanical properties, and strong acidity.
The phenolic foam with poor mechanical properties is easy to crack, which brings inconvenience to the construction, and the strong acidic phenolic foam board will corrode the wall and metal materials in the external wall insulation and cause damage to the building. To a certain extent, the application range of phenolic foam is limited
Although many experts have researched some methods to improve the shortcomings of phenolic foam, these methods are still immature, either the process is complicated and difficult to implement, or the toughening effect of phenolic foam is not obvious, or the cost is high, so it is necessary for the large-scale promotion of phenolic foam brings difficulties
People have been actively looking for ways to modify phenolic foam, such as the modified phenolic foam products introduced in patents such as patent application No. 95224169.2 and 201410341475.7. The loss and other aspects are still not up to the application standards of building exterior wall insulation materials, and the production cost is relatively high

Method used

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  • Method for developing low-density high-strength phenolic foam
  • Method for developing low-density high-strength phenolic foam
  • Method for developing low-density high-strength phenolic foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 94 parts of phenol, 3 parts of catalyst (50% sodium hydroxide solution), 6 parts of urea and 2 parts of modified molybdenum disulfide into the four-necked bottle, raise the temperature to 50~70°C, add 20 parts of formaldehyde, and react for a while Then add 80 parts of paraformaldehyde, react for a period of time and then add 3 parts of catalyst, raise the temperature to 80~85°C and react for 2~3 hours, when the viscosity of the resin reaches 2000~8000 mPa·S, cool down to 70°C, and then add formic acid to adjust pH to neutral, cooled and discharged to obtain the required phenolic resin; in the four-necked bottle, add 100 parts of the phenolic resin modified by the coupling agent grafted molybdenum disulfide in proportion, and then add 4 parts of surfactant, 4 parts of foaming agent and 20 parts of curing agent are mixed evenly and then poured into the mold and placed in a drying oven at 70°C for foaming. After meeting the foaming requirements, take out the mold and c...

Embodiment 2

[0026] Add 90 parts of phenol, 3 parts of catalyst (50% sodium hydroxide solution), 5 parts of urea and 2 parts of modified molybdenum disulfide into a four-necked bottle, raise the temperature to 50~70°C, add 26 parts of formaldehyde, and react for a period of time Finally, add 74 parts of paraformaldehyde, react for a period of time, then add 3 parts of catalyst, raise the temperature to 80~85°C and react for 2~3 hours, when the viscosity of the resin reaches 2000~8000 mPa·S, cool down to 73°C, and then add formic acid to adjust pH to neutral, cooled and discharged to obtain the required phenolic resin; in the four-necked bottle, add 100 parts of the phenolic resin modified by the coupling agent grafted molybdenum disulfide in proportion, and then add 4 parts of surfactant, 5 parts of foaming agent and 22 parts of curing agent are mixed evenly and then poured into the mold and placed in a drying oven at 70°C for foaming. After meeting the foaming requirements, take out the mo...

Embodiment 3

[0028] Add 98 parts of phenol, 4 parts of catalyst (50% sodium hydroxide solution), 7 parts of urea and 3 parts of modified molybdenum disulfide into the four-necked bottle, raise the temperature to 50~70°C, add 30 parts of formaldehyde, and react for a period of time Then add 70 parts of paraformaldehyde, react for a period of time and then add 4 parts of catalyst, raise the temperature to 80~85°C and react for 2~3 hours, when the viscosity of the resin reaches 2000~8000 mPa·S, cool down to 74°C, and then add formic acid to adjust pH to neutral, cooling and discharging to obtain the required phenolic resin; in a four-necked bottle, add 100 parts of the phenolic resin modified by the coupling agent grafted molybdenum disulfide in proportion, and then add 6 parts of surfactant, 5 parts of foaming agent and 25 parts of curing agent are mixed evenly and poured into the mold, and foamed in a drying oven at 70°C. After meeting the foaming requirements, the mold is taken out and cool...

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Abstract

The invention relates to a method for developing low-density high-strength phenolic foam. The method comprises the following steps of using molybdenum disulfide to modify the phenolic resin, foaming, curing and forming, so as to obtain the low-density high-strength phenolic foam, thereby overcoming the disadvantages of brittleness, easiness in slag falling, low strength and the like of the phenolic resin. The method has the advantages that a silane coupling agent is grafted with the molybdenum disulfide, so as to improve the dispersivity of the molybdenum disulfide in the phenolic resin and the compatibility with the resin; after treating by the silane coupling agent, the molybdenum disulfide can be grafted with amino groups, and the phenolic resin contains hydroxymethyl groups, so that under the reaction action of the amino groups and hydroxymethyl groups, the effect of increasing viscosity is realized, and the mechanical, water-resistant and anti-aging properties are improved; by adding the molybdenum disulfide, the heat conduction coefficient of the phenolic foam is reduced, the mechanical property of the phenolic foam is improved, and the low-density high-strength phenolic foam with water-resistant, heat-insulation and toughening properties can be obtained for building projects.

Description

technical field [0001] The invention belongs to the technical field of building exterior wall materials, and in particular relates to a method for developing low-density and high-strength phenolic foam. Background technique [0002] Compared with some developed countries, despite the rapid economic development of our country in recent years, the cost of economic resources invested in a unit of construction project is obviously 3-5 times higher. Although our country has a large amount of economic investment, some developers still use substandard flammable insulation materials in order to earn high profits. The series of fires that have occurred in recent years are all frightening. Fire sites are increasing year by year, such as: the new site of the CCTV building, construction sites in Shanghai, Nanjing Central Plaza, Jinan Olympic Sports Center, etc., so it is imperative to use safe and energy-saving materials. [0003] Phenolic foam has gradually entered people's field of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/14C08G14/08C08L61/34C08K9/06C08K3/30
CPCC08J9/141C08G14/08C08J2361/34C08K3/30C08K9/06C08K2003/3009C08L2201/02C08L2201/08C08L61/34
Inventor 孔祥坤周春华刘建国
Owner UNIV OF JINAN
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