Method for preparing biodegradable polyurethane foam by liquefied modification of bark powder and lignin

A foamed plastic and lignin technology is applied in the field of bark powder and lignin liquefaction modification to prepare degradable polyurethane foamed plastics. , good flame retardant performance, the effect of saving resources

Inactive Publication Date: 2012-09-19
BEIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to study the low reactivity of lignin in polyurethane, mainly through liquefaction of phenol to increase its methylol and phenolic hydroxyl content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for preparing degradable polyurethane foam by bark powder and lignin liquefaction modification, comprising the following steps:

[0030] Step 1: After mixing 10 g of larch bark powder and 10 g of alkali lignin, add it to 20 g of alkaline phenol solution, raise the temperature to 120° C., and react for 3 hours.

[0031] The second step: heating 40 g of liquefied product to 80° C., adding 40 g of formaldehyde and 20 g (30%) sodium hydroxide, and reacting for 4 hours to obtain modified lignin and tannin.

[0032] Step 3: 100 g of modified lignin and tannin, 10 g of polyether polyol, 10 g of methyl silicone oil, and 10 g of potassium oleate were mixed and foamed with 100 g of diphenylmethane diisocyanate to obtain a rigid foam.

Embodiment 2

[0034] Step 1: Mix 100g of larch bark powder and 100g of alkali lignin, add to 200g of alkaline phenol solution, heat up to 140°C, and react for 5h.

[0035] Step 2: heat 200 g of liquefied product to 90° C., add 800 g of formaldehyde and 40 g (30%) sodium hydroxide, and react for 6 hours to obtain modified lignin and tannin.

[0036] Step 3: 800g of modified lignin and tannin, 20g of polyether polyol, 20g of methyl silicone oil, and 20g of potassium oleate were mixed and foamed with 200g of diphenylmethane diisocyanate to obtain a rigid foam.

Embodiment 3

[0038] Step 1: After mixing 50 g of larch bark powder and 50 g of alkali lignin, add them to 110 parts by mass of alkaline phenol solution, raise the temperature to 130° C., and react for 4 hours.

[0039] Step 2: heat 120 g of liquefied product to 80° C., add 200 g of formaldehyde and 30 g (30%) sodium hydroxide, and react for 5 hours to obtain modified lignin and tannin.

[0040] Step 3: 300g of modified lignin and tannin, 15g of polyether polyol, 15g of methyl silicone oil, and 15g of potassium oleate were mixed and foamed with 150g of diphenylmethane diisocyanate to obtain a rigid foam.

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Abstract

The invention relates to a method for preparing biodegradable polyurethane foam by liquefied modification of bark powder and lignin. The method comprises the following steps: 1. adding phenol into alkaline solution, heating, then adding larch bark powder and the lignin, stirring evenly, carrying out reaction adequately, and cooling for use; 2. heating liquefied product, adding formaldehyde and catalyst to obtain methylolated lignin, phenolic hydroxyl lignin and methylolated tannin; 3. mixing above modified product, polyether, a foam homogenizing agent and catalyst according to a certain proportion, and mixing with isocyanate for foaming. The rigid foam material foamed by mixing, provided by the invention, has an apparent density of 0.03-0.05g/cm<3>, compressive strength greater than 0.15MP, thermal conductivity of 0.023W/(M.K), and water absorption of 3%. The method provided by the invention can improve the utilization of lignin, save resources, does not cause environmental pollution, and is high in production efficiency. The foam is good in lame retardant property.

Description

technical field [0001] The invention relates to a method for preparing degradable polyurethane foam through liquefaction modification of bark powder and lignin. Background technique [0002] Polyurethane (PUR) is a polymer with repeating structural units of urethane chain segments produced by the reaction of isocyanate (MDI, TDI) and polyol (polyester, polyether polyol). At present, the raw materials for producing polyester and polyether polyols are petrochemical products with strong toxicity and corrosion. The extensive use of these fossil resources has caused increasingly serious environmental problems, such as global warming, damage to the ozone layer, destruction of the carbon balance of the ecosystem, release of harmful substances, and natural disasters such as acid rain. Exploitation and search for new alternative resources The development of energy and chemicals has become a major issue that human society must solve in the new century. [0003] Lignin is a natural m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/64C08G18/54C08G18/48
Inventor 姜贵全庞久寅
Owner BEIHUA UNIV
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