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Cellulose foam material

A technology of cellulose foaming and cellulose solution, which is applied in the field of cellulose foaming materials, can solve the problem of insufficient foaming materials, achieve strong solubility, improve tensile strength and tear strength

Inactive Publication Date: 2019-12-17
淮安市冰青建设工程管理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are not many reports on the preparation of foam materials from cellulose solutions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Preparation of cellulose solution: Dissolve cellulose pulp in a mixed aqueous solution composed of urea, sodium hydroxide and water to obtain a cellulose solution; wherein, the mass percent concentration of pulp is 6%, and the mass percent concentration of urea is 12%, and the mass percentage concentration of sodium hydroxide is 6%;

[0023] 2) Preparation of cellulose foam material: add 40 g of pore-forming agent sodium sulfate (particle size less than 5 microns) to 100 g of cellulose solution and stir to obtain a mixed slurry, pour the mixed slurry into a mold for low-temperature molding for 72 hours; After molding, it was put into a coagulation bath of sulfuric acid and sodium sulfate for 1 hour immersion at 70°C (the mass percentage of sulfuric acid in the coagulation bath was 12%, and the concentration of sodium sulfate was 220 g / L). Cellulose foam.

Embodiment 2

[0025] 1) Preparation of cellulose solution: Dissolve cellulose pulp in a mixed aqueous solution composed of thiourea, sodium hydroxide and water to obtain a cellulose solution; wherein, the mass percentage concentration of pulp is 8%, and the mass percentage of urea is 8%. The concentration is 10%, and the mass percentage concentration of sodium hydroxide is 6%;

[0026] 2) Preparation of cellulose foam material: add 40 g of pore-forming agent sodium sulfate (particle size less than 5 microns) to 100 g of cellulose solution and stir to obtain a mixed slurry, pour the mixed slurry into a mold for low-temperature molding for 72 hours; After molding, it was put into a coagulation bath of sulfuric acid and sodium sulfate for 1 hour immersion at 70°C (the mass percentage of sulfuric acid in the coagulation bath was 12%, and the concentration of sodium sulfate was 220 g / L). Cellulose foam.

[0027] The mechanical properties of the cellulose foams prepared in Examples 1 and 2 were ...

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Abstract

The invention belongs to the technical field of celluloses, and particularly relates to a cellulose foam material. The cellulose foam material is prepared by adding a pore-forming agent sodium sulfateinto a cellulose solution and carrying out aging, regeneration, washing and drying processes, and the cellulose solution is prepared by dissolving a cellulose pulp in a mixed solution composed of urea / thiourea, sodium hydroxide and water. The cellulose foam material has the advantages of low production cost, low environmental protection pressure, good mechanical properties and high water absorption rate. Low-temperature molding selected in the invention facilitates the formation of a Na2SO4 crystal compound. The added Na2SO4 can inhibit the activity of hydrogen ions by utilizing the common ion effect of Na2SO4 and sulfuric acid so as to prevent excessive degradation of the cellulose. The elongation at break of the prepared cellulose foam material reaches 2.2% or above, the tensile strength is about 0.25 MPa, and the tearing strength is 0.2 KN.m.

Description

technical field [0001] The invention belongs to the technical field of cellulose foam materials, in particular to a cellulose foam material. Background technique [0002] As a daily necessities and industrial supplies, foam plastics have appeared for decades and become an indispensable item in industrial production and people's lives. The foam products on the market today are mainly made of polyurethane and polystyrene derived from petroleum products. It not only pollutes the environment in the production process, but also the waste is difficult to degrade, especially when it is used for human hygiene, household washing and makeup, long-term use will cause certain harm to people. With the continuous reduction of oil resources, the source of its raw materials will also be a serious problem. After entering the 21st century, people have a further understanding of environmental protection, and there is bound to be a new environmentally friendly foam material. [0003] Cellulo...

Claims

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Application Information

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IPC IPC(8): C08L1/02C08J9/26
CPCC08J9/26C08J2201/0444C08J2205/05C08J2301/02
Inventor 刘传礼
Owner 淮安市冰青建设工程管理有限公司
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