Preparation method of cellulose modified phenolic foams

A technology of phenolic foam and cellulose, applied in the field of cellulose phenolic foam, to achieve the effects of promoting efficient utilization, improving activity, and broad market prospects

Active Publication Date: 2015-01-28
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology has achieved good results by using filling modifiers, urea modified resins, and toughening agents. However, there are few studies on the use of natural biomass to enhance foam applications, especially the use of cellulose. The main reason is that fiber The molecular structure of the element is stable, insoluble in common solvents, and it is difficult to cross-link with the phenolic resin to achieve the purpose of modification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Prepare 7wt% NaOH / 12wt% urea aqueous solution and pre-cool it to -12°C, add crushed cotton, and stir at high speed for 2 minutes to obtain a cellulose solution; mix phenol with the cellulose solution, and the volume of the cellulose solution is 10% of the phenol , to obtain biophenol. Mix biomass phenol and formaldehyde at a molar ratio of 1:1.5, add NaOH to catalyze, fully stir at 80°C for 90 minutes to carry out polycondensation reaction, then dehydrate under reduced pressure, cool and discharge, and obtain a flowable cellulose phenolic resin;

[0033] Get 100 parts of flowable cellulose phenolic resin, Tween-804 parts, 5 parts of n-pentane, 10 parts of curing agent, described curing agent is phosphoric acid, p-toluenesulfonic acid and water mixed in a mass ratio of 3:10:2 The mixture was fully stirred at room temperature 25°C for 60s, and then foamed at 70°C for 15min to obtain a solid cellulose phenolic foam.

[0034] The apparent density of the obtained phenolic f...

Embodiment 2

[0036] Prepare 7wt% NaOH / 12wt% urea aqueous solution and pre-cool to -12°C, add crushed cotton, stir at high speed for 5 minutes to obtain cellulose solution; mix phenol with cellulose solution, the volume of cellulose solution is 20% of phenol , to obtain biophenol. Mix biomass phenol and formaldehyde at a molar ratio of 1:2.0, add ammonia water to catalyze, fully stir at 80°C for 120 minutes to carry out polycondensation reaction, then dehydrate under reduced pressure, cool and discharge, and obtain a flowable cellulose phenolic resin;

[0037] Get 100 parts of flowable cellulose phenolic resin, 4 parts of silicone oil, 10 parts of n-pentane, and 15 parts of curing agent. The curing agent is a mixture of hydrochloric acid, acetic acid and water in a mass ratio of 3:10:2. Fully stir at 30°C for 40s, then foam at 75°C for 10min to prepare solid cellulose phenolic foam.

[0038] The apparent density of the obtained phenolic foam is 56kg / m 3 , the compressive strength is 138kp...

Embodiment 3

[0040] Prepare 7wt% NaOH / 12wt% urea aqueous solution and pre-cool to -12°C, add crushed cotton, stir at high speed for 3 minutes to obtain cellulose solution; mix phenol with cellulose solution, the volume of cellulose solution is 15% of phenol , to obtain biophenol. Mix biomass phenol and formaldehyde at a molar ratio of 1:1.8, add NaOH to catalyze, fully stir at 85°C for 100 minutes to carry out polycondensation reaction, then dehydrate under reduced pressure, cool and discharge to obtain a flowable cellulose phenolic resin;

[0041] Get 100 parts of flowable cellulose phenolic resin, Tween-806 parts, 3 parts of sherwood oil, 20 parts of curing agent, described curing agent is phosphoric acid, p-toluenesulfonic acid and water mixed by mass ratio 3:10:2 The mixture was fully stirred at room temperature of 20°C for 60s, and then foamed at 60°C for 20min to obtain a solid cellulose phenolic foam.

[0042] The apparent density of the obtained phenolic foam is 69kg / m 3 , the co...

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Abstract

The invention discloses a preparation method of cellulose phenolic foams. The preparation method comprises the following steps: preparing a mixed aqueous solution containing 7wt% of sodium hydroxide and 12wt% of urea, precooling the mixed aqueous solution to -12 DEG C, adding crushed cellulose, and stirring for 2-5 minutes to obtain a transparent cellulose solution; adding the cellulose solution into phenol to obtain biomass phenol; mixing the biomass phenol with formaldehyde according to a mole ratio of 1:1.5-1:2.0, adding a catalyst to perform condensation polymerization, performing reduced pressure dehydration, cooling and discharging to obtain fluid cellulose phenolic resin; and uniformly mixing 100 parts of fluid cellulose phenolic resin, 4-8 parts of surfactant, 3-10 parts of foaming agent and 10-20 parts of curing agent in parts by weight, foaming for 10-20 minutes at 60-80 DEG C to obtain the cellulose modified phenolic foams. By adopting the preparation method disclosed by the invention, cellulose replaces part of phenol, so that the production cost of the phenolic foams is reduced, and meanwhile, efficient utilization of biomass resources is promoted.

Description

technical field [0001] The invention relates to the technical field of polymer flame-retardant materials, in particular to a cellulose phenolic foam. Background technique [0002] In recent years, fires have occurred frequently in our country, and more than 90% of the fires are due to the burning of indoor combustibles caused by inadvertent use of fire, which seriously threatens people's property and life safety; The demand for flame-retardant building materials will further increase, and it is imperative to carry out fire-retardant and flame-retardant research on new energy-saving and thermal insulation materials. Phenolic foam plastic is a kind of high-quality and cheap light-weight flame-retardant material. It has the advantages of heat resistance, flame retardant, self-extinguishing, low smoke and low toxicity, flame penetration resistance, and no dripping in case of fire. It is very suitable for construction insulation material. However, its application is limited due...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/14C08L61/14C08G8/28
Inventor 刘生鹏黄普林许莉莉樊庆春丁一刚
Owner WUHAN INSTITUTE OF TECHNOLOGY
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