Method for preparing embossable solvent-free synthetic leather

A manufacturing method and a solvent-free technology, applied in the field of synthetic leather manufacturing, can solve the problems of low production efficiency, inability to produce, poor hydrolysis resistance and aging resistance, etc.

Active Publication Date: 2014-09-10
ZHEJIANG HEXIN NEW MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, my country's organic-solvent-free synthetic leather technology is in the ascendant. The Chinese invention patent application number 201110254065.5 discloses a method for producing polyurethane synthetic leather by a solvent-free two-component polyurethane scraping method, but this method can only produce lines with release paper. Cross-linked, thermoset, solvent-free synthetic leather, while embossed products with a wider market cannot be produced
The Chinese invention patent with the

Method used

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  • Method for preparing embossable solvent-free synthetic leather
  • Method for preparing embossable solvent-free synthetic leather
  • Method for preparing embossable solvent-free synthetic leather

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] a) Manufacture of embossable solvent-free synthetic leather dry-laid semi-finished products:

[0027] Unwinding of release paper → first coating surface layer (scraper gap 10 wires, water-based polyurethane slurry) → drying and cooling → second coating of thermoplastic foaming intermediate layer (scraper gap 20 wires, water-based polyurethane mechanical foaming slurry, foaming Density 500g / l) → drying and cooling → three-coat thermosetting foam bonding bottom layer (squeegee gap 40 wires, using two-component reactive solvent-free slurry) → pre-baking semi-crosslinked semi-foaming (oven temperature 80 ° C, Dwelling time 60s) → lamination substrate (0.55mm, plain gray black woven fabric) → cross-linking curing (oven temperature 140°C, dwelling time 120s; aging room temperature 90°C, aging time 32 hours) → peel off the release paper → Embossable solvent-free synthetic leather dry-laid semi-finished products.

[0028] b) Embossing, post-processing:

[0029] Embossable sol...

Embodiment 2

[0031] a) Manufacture of embossable solvent-free synthetic leather dry-laid semi-finished products:

[0032] Unwinding of release paper → first coating surface layer (scraper gap 0 wire, solvent-based polyurethane slurry) → drying and cooling → second coating of thermoplastic foaming intermediate layer (scraper gap 20 wire, water-based polyurethane mechanical foaming slurry, foaming Foam density 600g / l) → drying and cooling → three-coat thermosetting foam bonding bottom layer (squeegee gap 30 wires, using two-component reactive solvent-free slurry) → pre-baking semi-crosslinked semi-foaming (oven temperature 70°C , residence time 50s)→lamination substrate (1.2mm, white superfine fiber synthetic leather semi-finished product)→cross-linking curing (oven temperature 150°C, residence time 150s; aging room temperature 80°C, aging time 48 hours)→peel off Pattern paper → Embossable solvent-free synthetic leather dry-laid semi-finished product.

[0033] b) Embossing, post-processing:...

Embodiment 3

[0036] a) Manufacture of embossable solvent-free synthetic leather dry-laid semi-finished products:

[0037] Unwinding of release paper → first coating surface layer (scraper gap 30 wires, solvent-based polyurethane slurry) → drying and cooling → second coating of thermoplastic foaming intermediate layer (scraper gap 20 wires, water-based polyurethane mechanical foaming slurry, foaming Foam density 700g / l) → drying and cooling → three-coat thermosetting foaming adhesive bottom layer (blade gap 80 wires, using three-component reactive solvent-free paste (isocyanate component, polyol component and colorant component) → Pre-baking semi-crosslinked semi-foaming (oven temperature 150°C, residence time 100s) → bonding substrate (0.95mm, double-sided fleece warp knitted fabric) → crosslinking curing (oven temperature 180°C, residence time 600s; Aging room temperature 100°C, aging time 72 hours) → Peel off the release paper → Embossable solvent-free synthetic leather dry process semi-...

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Abstract

The invention discloses a method for preparing embossable solvent-free synthetic leather. The method comprises the following steps: (a) preparing an embossable solvent-free synthetic leather dry-method half-finished product, namely, uncoiling a piece of release paper, coating a surface layer, drying, cooling, coating a thermoplastic foaming middle layer, drying, cooling, coating a thermoplastic foaming adhesive bottom layer, pre-drying, semi-crosslinking, semi-foaming, adhering to a substrate, cross-linking, solidifying, and peeling off the release paper, so as to obtain an embossable solvent-free synthetic leather dry-method finished product; and (b) embossing and performing aftertreatment, namely, uncoiling the embossable solvent-free synthetic leather dry-method finished product, embossing, and performing other aftertreatment, so as to prepare an embossable solvent-free synthetic leather finished product. The made synthetic leather is of a two-layer foaming structure, the upper layer is a relatively thin thermoplastic foaming middle layer which can be softened, cooled and reformed and deforms at certain temperature, so that the synthetic leather has the characteristic of embossability; the lower layer is a relatively thick thermoplastic foaming bottom layer which can show main physical properties and the hand feeling of the synthetic leather. The synthetic leather can be produced by using an ordinary synthetic leather production line.

Description

technical field [0001] The invention belongs to the field of synthetic leather manufacture, and relates to a method for manufacturing PU synthetic leather, and a method for manufacturing embossable solvent-free synthetic leather. Background technique [0002] The traditional synthetic leather production process needs to use a large amount of organic solvents, which will seriously damage the ecological environment. The use of organic solvent-free synthetic leather production processes is conducive to environmental protection. At present, my country's organic-solvent-free synthetic leather technology is in the ascendant. The Chinese invention patent application number 201110254065.5 discloses a method for producing polyurethane synthetic leather by a solvent-free two-component polyurethane scraping method, but this method can only produce lines with release paper. The cross-linked thermosetting solvent-free synthetic leather of the body shape, while the embossed products of the...

Claims

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Application Information

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IPC IPC(8): D06N3/14B32B37/02B32B37/15
Inventor 周志军汪旗陈永陈明磊张玉洲
Owner ZHEJIANG HEXIN NEW MATERIAL CO LTD
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