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Method for preparing PU (polyurethane) synthetic leather additive

A synthetic leather and additive technology, applied in textiles and papermaking, raw material separation, paper recycling, etc., can solve problems such as price reduction, and achieve the effect of low price, wide source and lower production cost

Active Publication Date: 2013-03-06
SHANGHAI TONNOR MATERIAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, this product is completely comparable to imported products in terms of main technical indicators and performance, but the price is greatly reduced

Method used

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  • Method for preparing PU (polyurethane) synthetic leather additive
  • Method for preparing PU (polyurethane) synthetic leather additive
  • Method for preparing PU (polyurethane) synthetic leather additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of PU nubuck leather cellulose powder additive: it is characterized in that the following steps are completed:

[0024] A. Raw material screening: After treating waste sulfuric acid velvet with ZL200620031728 patented technology of Zhang Nan, the obtained ash content is 0.4-1.5%, whiteness ≥ 65, cellulose content ≥ 98%, polymerization degree of about 300, and fineness of 60 mesh Cotton pulp powder industrial raw material left and right.

[0025] B. High-temperature drying: use drying equipment to dry the purified cotton pulp powder industrial raw materials at high temperature, and the moisture content of the dried cotton pulp powder must not exceed 10%;

[0026] C, extruding, shearing and grinding: select roller mill and shearing fine mill, after mixing 65% of cotton pulp powder and 35% of poplar wood pulp (powder), physically extrude and shear together. Cut and grind to 325-1000 mesh to prepare cellulose fine powder additive with fiber length 16-1...

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Abstract

The invention provides a method for preparing a PU (polyurethane) synthetic leather additive, and the method is characterized in that the PU synthetic leather additive is prepared by using pure cotton-pulp fiber powder prepared by using a processing unit for castoff of cotton seed shedded by vitriol (patent number: ZL200620031728.1) as a main industrial raw materials through following the steps: mixing fibrous powder such as wood pulp (powder), boony pulp (powder), bamboo pulp (powder), and the like in certain proportion according to the different requirements for leather-making types of PU synthetic leather-making enterprises; and then directly carrying out physical squashing, stretching, shearing and levigating machining on the obtained mixture so as to obtain extra-fine powder (more than 325-1000 meshes). The method provided by the invention has the characteristics of low cost, high performance / price ratio and popularization facilitation, and provides a choice for the manufacturing and innovative solutions of PU synthetic leathers.

Description

[0001] 1. Field [0002] The invention belongs to the technical field of PU synthetic leather chemical industry, and in particular relates to a preparation method of a multifunctional cellulose fine powder additive used in the production of PU resin synthetic leather. 2. Background technology [0003] The domestic synthetic leather industry selects PU resin, DMF, auxiliary agent and cellulose powder additive mixed slurry to coat on the base cloth, and it is a known method to manufacture synthetic leather with different properties. At present, the additives are mainly microcrystalline cellulose prepared from pulp by chemical methods, and wood powder and bamboo powder, which are ground and pulverized after poplar wood chips are bleached with hydrogen oxide. Among them, high-end products still rely on imported foreign products. [0004] Before the 1980s, the vitamin products used for PU leather additives in my country mainly relied on imports, and the standards were also formulat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21B1/34D21B1/32D06N3/14
CPCY02W30/64
Inventor 张楠崔永坤
Owner SHANGHAI TONNOR MATERIAL SCI
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