Preparation method of plant fiber toughened phenolic foam

A technology of phenolic foam and plant fiber, applied in the field of composite materials, to achieve the effects of improving mechanical properties, reducing costs, and reducing the content of free phenolic formaldehyde

Inactive Publication Date: 2018-09-14
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the unused reed wadding and a large amount of seed hair produced when the seeds of Platanus tribulus are propagated are recycled, which is expected to solve the recycling of various plant fibers and the environmental problems caused by them.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Mix the plant fiber and 0.01mol / L HCl solution at a ratio of 1:100, let it stand for 30 minutes, filter and dry the plant fiber, mix the plant fiber and 0.01mol / L NaOH solution at a ratio of 1:100, and then add 0.1 part of hydrogen peroxide in the Stir at 15°C for 40 minutes, dry at 60°C, and prepare chopped fibers with a length of about 1mm;

[0029] Mix phenol and formaldehyde in a molten state at a molar ratio of 1:1.2 and stir evenly. Add the catalyst at 60°C and keep it warm for 30 minutes, then raise the temperature to 75°C and react for 210 minutes. After the reaction, cool the reaction solution to below 70°C. mol / L dilute hydrochloric acid to adjust the pH of the solution to 9. The moisture in the solution was removed by vacuum distillation or rotary evaporation to obtain an expandable resole phenolic resin with a solid content of 80%.

[0030] Get 100 parts of expandable resins, 3 parts of Tween-803 parts, 5 parts of n-pentane, 0.5 parts of chopped fibers, 10 ...

Embodiment 2

[0033] Mix the plant fiber and 0.01mol / L HCl solution at a ratio of 1:100, let it stand for 30 minutes, filter and dry the plant fiber, mix the plant fiber and 0.01mol / L NaOH solution at a ratio of 1:100, and then add 0.1 part of hydrogen peroxide in the Stir at 15°C for 40 minutes, dry at 60°C, and prepare chopped fibers with a length of about 1mm;

[0034] Mix phenol and formaldehyde in a molten state at a molar ratio of 1:1.5 and stir evenly. Add the catalyst at 60°C and keep it warm for 30 minutes, then raise the temperature to 80°C and react for 180 minutes. After the reaction, cool the reaction solution to below 70°C. mol / L dilute hydrochloric acid to adjust the pH of the solution to 9. The moisture in the solution was removed by vacuum distillation or rotary evaporation to obtain an expandable resole phenolic resin with a solid content of 80%.

[0035] Take 100 parts of expandable resin, 4 parts of Tween-804 parts, 8 parts of n-pentane, 4 parts of chopped fiber, and 10...

Embodiment 3

[0038] Mix the plant fiber and 0.01mol / L HCl solution at a ratio of 1:100, let it stand for 30 minutes, filter and dry the plant fiber, mix the plant fiber and 0.01mol / L NaOH solution at a ratio of 1:100, and then add 0.1 part of hydrogen peroxide in the Stir at 15°C for 40 minutes, dry at 60°C, and prepare chopped fibers with a length of about 1 mm;

[0039] Mix phenol and formaldehyde in a molten state at a molar ratio of 1:1.8 and stir evenly. Add the catalyst at 60°C and keep it warm for 30 minutes, then raise the temperature to 85°C and react for 150 minutes. After the reaction, cool the reaction solution to below 70°C. mol / L dilute hydrochloric acid to adjust the pH of the solution to 9. The moisture in the solution was removed by vacuum distillation or rotary evaporation to obtain an expandable resole phenolic resin with a solid content of 80%.

[0040] Take 100 parts of expandable resin, 5 parts of Tween-805 parts, 10 parts of n-pentane, 10 parts of chopped fiber, and 1...

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Abstract

The invention discloses a preparation method of plant fiber toughened phenolic foam. The preparation method comprises the following steps: infiltrating natural plant fibers under an acidic condition,then soaking the natural plant fibers in an alkaline solution, finally carrying out drying, cutting the natural plant fibers to chopped fibers of 1-3 mm for standby, preparing expandable resol, uniformly mixing 100 parts of the expandable resol, 3-8 parts of a surfactant, 5-12 parts of a foaming agent, 0.5-20 parts of the chopped fibers and 8-15 parts of a curing agent, carrying out foaming at anenvironment of 50-70 DEG C for 30-60 minutes, and then carrying out demoulding to obtain the plant fiber toughened phenolic foam. According to the invention, phenolic foam is toughened by using platanus orientalis flower flocks by the road side in spring and reed catkins which are not recycled in autumn as modifying agents, the mechanical property of the phenolic foam is improved, the content of free phenolic aldehyde is reduced, natural materials are used, and a new method is provided for solving the environmental problems and recycling biomass materials.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a preparation method of plant fiber toughened phenolic foam. Background technique [0002] Phenolic foam is a cheap and good-quality lightweight thermal insulation material. It is known as the "King of Thermal Insulation" because of its own performance characteristics. It can be seen from the molecular structure of phenolic resin that there are a large number of benzene rings in the phenolic resin molecule, and the methylene free radicals generated when the foam is burned are easily absorbed by the benzene ring molecules, which makes the foam structure have a high carbon content and the material is stable. Evaporation is reduced, so that the phenolic foam has a good thermal insulation effect. The test results show that the oxygen index of ordinary phenolic foam is around 40, and its combustion performance is B1 level. If it is modified, its oxygen index c...

Claims

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Application Information

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IPC IPC(8): C08L61/06C08L1/02C08G8/10C08J9/14
CPCC08G8/10C08J9/0033C08J9/0061C08J9/0066C08J9/0085C08J9/141C08J2203/14C08J2361/06C08J2401/02
Inventor 刘生鹏万梦秋许莉莉孙国锋熊芸吴晓宇丁一刚
Owner WUHAN INSTITUTE OF TECHNOLOGY
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