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Polyurethane synthetic leather release paper release layer hot-melt resin composition and release paper using the release layer and preparation method

A resin composition, polyurethane technology, applied in the direction of paper, etc., can solve the problems of poor solvent resistance polyurethane coating coloring migration, brittle large release layer easy to break, complex manufacturing process, etc., to achieve good repeated use performance, excellent resistance. Solvent properties, effect of improving gloss

Active Publication Date: 2015-10-07
ZHEJIANG KAREN SPECIALTY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The high-gloss release paper used above is mainly a silicon-containing release layer coated with epoxy acrylic resin. The coating has high hardness, high brittleness, complicated manufacturing process, and high cost. Only a few foreign suppliers can produce it.
Color migration of polyurethane coating due to poor solvent resistance during production and use
Due to the brittle and large release layer is easily broken and cannot be used, the number of repeated uses is small, resulting in high production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The resin coating modification formula is 100 parts by mass of polypropylene (PP) material, 5 parts of poly-4-methylpentene (TPX), 0 part of polyethylene (PE) material, 0.1 part by mass of 2,2′ After -methylene-bis-(4,6-di-tert-butylphenoxy)sodium phosphate, 0.1 part of calcium stearate, 0.1 part of zinc glycerate, the resin mixing sequence is: first add polypropylene, poly-4 -Methylpentene, polyethylene, and zinc glycerate were stirred with a high-speed mixer for 4 minutes, and then 2,2'-methylene-bis-(4,6-di-tert-butylphenoxy)sodium phosphate, hard Calcium fatty acid was stirred for 5 minutes. Stir evenly and enter the hot-melt extruder to extrude and coat on the fiber base paper in a molten state at 270°C. The coating amount is 10g / m 2 . Calendering was then carried out with a calender at a temperature of 110° C. and a linear pressure of 90 kg / cm. After calendering, the gloss of the product reaches 92 degrees, the surface peel strength is 6.77N / m, the heat distort...

Embodiment 2

[0033] The modified resin coating formula is 100 parts by mass of polypropylene (PP) material, 20 parts of poly-4-methylpentene (TPX), 3 parts of polyethylene (PE) material, 0.2 part by mass of 2,2′ - After methylene-bis-(4,6-di-tert-butylphenoxy)sodium phosphate, 0.2 parts of calcium stearate, and 0.2 parts of zinc glycerate, the resin mixing sequence is as in Example 1. Stir evenly and enter the hot-melt extruder to extrude and coat on the fiber base paper in a molten state at 280°C, and the coating amount is 30g / m 2 . Calendering was then carried out with a 5-roll calender at a temperature of 115° C. and a linear pressure of 100 kg / cm. After calendering, the gloss of the product reaches 94 degrees, the surface peel strength is 6.0N / m, the heat distortion temperature is 132°C, the bending strength is 35.8MPa, the number of times of reuse is 60 times, and the solvent resistance is excellent.

Embodiment 3

[0035] The modified resin coating formula is 100 parts by mass of polypropylene (PP) material, 20 parts of poly-4-methylpentene (TPX), 3 parts of polyethylene (PE) material, 0.3 part by mass of 2,2′ After -methylene-bis-(4,6-di-tert-butylphenoxy)sodium phosphate, 0.3 parts of calcium stearate, 0.3 parts of zinc glycerate, the resin mixing sequence is as in Example 1 and stirred evenly before entering the hot melt The extruder is extruded and coated on the fiber base paper in a molten state at 290°C, and the coating amount is 35g / m 2 . Calendering was then carried out with a calender at a temperature of 120° C. and a linear pressure of 105 kg / cm. After calendering, the gloss of the product reaches 95 degrees, the surface peel strength is 3.5N / m, the heat distortion temperature is 135°C, the bending strength is 37.6MPa, the number of times of reuse is 45 times, and the solvent resistance is excellent.

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Abstract

The invention relates to the field of synthetic leather production and especially relates to a release layer hot-melt resin composition of a release paper for polyurethane synthetic leather, the release paper with the release layer and a preparation method of the release paper. The hot-melt resin composition comprises polypropylene, poly-4-methylpentene and polyethylene. The preparation method comprises the following steps of 1, by a hot-melting extruder coating method, extruding the hot-melt resin composition in a melt state at a temperature of 270 to 300 DEG C and coating the hot-melt resin composition on a fiber base paper, and fast cooling for 1-5s to a normal temperature, and 2, carrying out press polishing by a press polishing machine under the conditions of a temperature of 90-130 DEG C and linear pressure of 90-120kg / cm to obtain the release paper for polyurethane synthetic leather. The preparation method has simple processes, can be controlled easily, has a low cost and can produce products having good performances.

Description

technical field [0001] The invention relates to the field of synthetic leather production, in particular to a release paper release layer hot-melt resin composition for polyurethane synthetic leather, a release paper using the release layer and a preparation method thereof. Background technique [0002] In the production of polyurethane synthetic leather, the dry method (also known as transfer coating) production process is to apply the coating agent (polyurethane) on the release paper, form a continuous and uniform film after drying, and then coat the film on the film. The upper adhesive and the fabric (or wet bottom skin) are laminated, and then dried, the release paper and the leather are peeled off, and the coating agent (including the adhesive layer) film will be transferred from the release paper to the fabric ( or leather). Make it with a high gloss on the release liner on the surface of the release paper. [0003] A Chinese invention patent application (application...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H19/22D21H23/46
Inventor 叶慧仁
Owner ZHEJIANG KAREN SPECIALTY MATERIALS
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