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Preparation method of lignin phenolic foams

A technology of phenolic foam and phenolic foam, which is applied in the field of catalyst selection in the resin preparation process, can solve problems such as low reactivity, reduced molecular weight, and high viscosity of foamed resins, and achieve simplified operation steps, improved resin activity, and shorter production cycles. shortened effect

Active Publication Date: 2014-03-05
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few studies on the application of replacing phenol in phenolic foams. The main reason is that the lignin composition is complex and the reactivity is low. The application of lignin or waste wood in foaming resin retrieved from the literature is liquefied with phenol. Then react with formaldehyde (mostly liquid formaldehyde). Since the molecular weight of lignin or wood does not decrease significantly, the foaming resin has a high viscosity and is difficult to foam. The catalyst used is generally sodium hydroxide aqueous solution, or sodium hydroxide aqueous solution and dihydrogen. Compounding of valent basic oxides, or barium hydroxide, but it still takes a long time to cure the resin when applied to lignin-modified foaming resin. It takes 0.5h-2h for frame foaming
Some use organic solvents to purify papermaking waste, and the obtained lignin is used to replace phenol to prepare foaming resin, which increases the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 280kg dilute acid (concentrated acid) hydrolyzed lignin degradation mixture (about 50% lignin content), 590kg phenol, 1% phenol quality catalyst compound (zinc oxide: trisodium phosphate mass ratio 1:1) into the kettle After mixing, maintain the temperature at 70 °C, add paraformaldehyde five times, every 10 minutes, then heat up to 80 °C for 35 minutes, continue to heat up to 98 °C for 1 hour, then add a metered amount of urea, and cool to 60 °C Discharge. Take by weighing the resin that 150kg is cooled to room temperature, 4.5kg Tween-80, foaming agent n-pentane 6kg, in stirring tank, stir at high speed, with solidifying agent (10kg, phosphoric acid, p-toluenesulfonic acid and water mass ratio are 30: 95:20) High-speed stirring and blending at the pouring head, then pouring on the non-woven fabric, entering the 68 ℃ assembly line, foaming and curing, the foam density is 63-65kg / m 3 .

Embodiment 2

[0031] Add 300kg lignosulphate / alkali lignin / lignosulfonate degradation mixture (lignin content about 50%wt), 590kg phenol, 1.5% phenol quality catalyst complex (calcium oxide: dihydrogen phosphate) into the kettle. Sodium mass ratio 1:2), after mixing, maintain the temperature at 70 °C, add paraformaldehyde five times, with an interval of 15 minutes each time, and then heat up to 83 °C for 40 minutes, continue to heat up to 96 °C for 1.2 hours, and then add The metered urea is cooled to 60°C and discharged. Take by weighing the resin that 150kg is cooled to room temperature, 4.5kg Tween-80, foaming agent n-pentane 6.75kg, stirs at high speed in stirring tank, and solidifying agent (11kg, phosphoric acid, p-toluenesulfonic acid and water mass ratio are 25 :95:22) High-speed stirring and blending at the pouring head, then pouring on the non-woven fabric, entering the 68 ℃ assembly line, foaming and curing, the foam density is 60-63kg / m 3 .

Embodiment 3

[0033] Add 320kg lignin sulfate / alkali lignin / lignosulfonate degradation mixture (about 50% lignin content), 590kg phenol, 2.0% phenolic quality catalyst compound (magnesium oxide: sodium tripolyphosphate) to the kettle mass ratio of 2:1), after mixing, maintain the temperature at 70 °C, add paraformaldehyde five times, every 20 minutes, and then heat up to 85 °C for 50 minutes, continue to heat up to 96 °C for 1.5 hours, and then add metered The urea is cooled to 60°C for discharge. Take by weighing the resin that 150kg is cooled to room temperature, 4.5kg Tween-80, foaming agent n-pentane 7.5kg, in stirring tank, stir at high speed, and solidifying agent (11.5kg, phosphoric acid, p-toluenesulfonic acid and water mass ratio are 24:92:26) High-speed stirring and blending at the pouring head, then pouring on the non-woven fabric, entering the 68 ℃ assembly line, foaming and curing, the foam density is 60-63kg / m 3 .

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Abstract

The invention relates to a preparation method of lignin phenolic foams. Lignin is used for partially replacing phenol through chemical degradation and is subjected to an addition polycondensation reaction with paraformaldehyde in the presence of a basic catalyst which is compounded from a basic oxide and a phosphorated sodium salt. The prepared resin is relatively high in activity, and conventional foaming agents, curing agents and surfactants are adopted to meet requirements for the curing speed of a phenolic foam production line, so that the industrial production can be performed. The preparation method disclosed by the invention not only can reduce the cost of the phenolic foams but also can alleviate the environmental pollution.

Description

technical field [0001] The present invention relates to a method for preparing foamed resin modified by lignin and phenolic foam thereof. In particular, it relates to the selection of catalysts in the resin preparation process, which is suitable for industrial continuous production. Background technique [0002] my country is the second largest energy consumer in the world, among which the energy consumption of buildings is relatively high, and the energy consumption per unit building area is more than 2-3 times that of developed countries. The energy consumption of building materials and buildings accounts for 47.3% of the total energy consumption, exceeding all developed countries. Sum. Phenolic foam is known as the "king of thermal insulation materials" due to its excellent properties. At present, my country has set two goals in building energy conservation: first, by 2010, the energy saving rate of all urban buildings should reach 50%, with megacities and some cities ta...

Claims

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Application Information

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IPC IPC(8): C08G8/28C08J9/14C08H7/00
Inventor 胡立红周永红周静杨晓慧
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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