Water-based polyurethane varnish and method for preparing same

A water-based polyurethane and varnish technology, applied in the chemical field, can solve the problems of poor dry and wet rub resistance, increased film hardness, unsatisfactory light resistance, yellowing resistance and other physical properties, and achieve narrow molecular weight distribution and excellent mechanical properties. , Excellent photostability effect

Inactive Publication Date: 2012-10-17
SHANDONG TIANQING TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the water-based polyurethane varnishes used by tanneries are foreign products. Domestically produced water-based polyurethane varnishes still have the disadvantages of poor hand feeling, solvent resistance, heat resistance, and poor resistance to dry and wet rubbing.
[0004] Chinese patent CN101717488A discloses a preparation method of epoxy resin modified water-based polyurethane emulsion: by using epoxy resin as a macromolecular chain extender, epoxy groups and hydroxyl groups participate in the reaction to form multiple crosslinks, although the polyurethane has improved Water resistance, solvent resistance, and heat resistance, but the hardness of the film increases, the hand feel becomes worse, and the film has cracks and the leveling property deteriorates
However, the mechanical stability of this modified emulsion is not very good, and the emulsion is prone to thickening, precipitation, and polymerization after being placed at room temperature for several months
[0006] Chinese patent CN1847277A discloses a preparation method of anionic self-emulsifying water-based polyurethane emulsion: the application of methylene dimethyl diisocyanate in water-based polyurethane is proposed in this patent, although methylene dimethyl diisocyanate is used as raw material Water-based polyurethane can meet many requirements of leather finishing, but as a water-based varnish on the top layer of high-grade leather, it cannot meet the requirements of light resistance, yellowing resistance and other physical properties

Method used

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  • Water-based polyurethane varnish and method for preparing same
  • Water-based polyurethane varnish and method for preparing same
  • Water-based polyurethane varnish and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Taking the production of 475 kg of water-based polyurethane varnish as an example, the raw material formula ratio adopts the lower limit value, and the product brand of Asahi Kasei, polycarbonate diol PCDL-T4671 (molecular weight 1000), dihydroxy Methylpropionic acid, 1.6-hexanediol, dimethylaminoethanol, and isophoronediamine subspecies.

[0044] Raw material components and formula: polycarbonate diol PCDL-T4671 (molecular weight: 1000): 57.28 kg, H 12 DMI: 36 kg, bismuth sulfonic acid-based catalyst: 0.126 kg, dimethylolpropionic acid: 4.64 kg, 1,6-hexanediol: 0.4 kg, acetone: 48 kg, dimethylaminoethanol: 3.08 kg, antioxidant Agent 1010: 0.28 kg, deionized water: 364 kg, isophorone diamine: 0.8 kg, propylene glycol carbonate: 8 kg, double-terminated hydroxyl polyether modified silicone oil: 0.8 kg.

[0045] Its preparation method steps are as follows:

[0046] 1. Dehydration treatment of polycarbonate diol PCDL-T4671 (molecular weight: 1000)

[0047] Add polycarbonat...

Embodiment 2

[0059] Taking the production of 422 kg of water-based polyurethane varnish as an example, the ratio of raw materials adopts the upper limit value, and the product brand of Asahi Kasei, polycarbonate diol PCDL-T4672 (molecular weight: 2000), dihydroxy Methyl butyric acid, ethyl butyl propylene glycol, dimethylaminoethanol, isophorone diamine sub-species.

[0060] Formula: polycarbonate diol PCDL-T4672 (molecular weight: 2000): 62.8 kg, H 12 DMI: 31.2 kg, bismuth sulfonic acid catalyst: 0.252 kg, dimethylol butyric acid: 5.12 kg, ethyl butyl propylene glycol: 1.90 kg, acetone: 57.6 kg, dimethylaminoethanol: 3.40 kg, antioxidant 1010 : 0.32 kg, deionized water: 304 kg, isophorone diamine: 1.6 kg, propylene glycol carbonate: 12 kg, double-terminated hydroxyl polyether modified silicone oil: 0.8 kg.

[0061] Its preparation method steps are as follows:

[0062] 1. Dehydration treatment of polycarbonate diol PCDL-T4672 (molecular weight: 2000)

[0063] Add polycarbonate diol PCDL...

Embodiment 3

[0075] Taking the production of 476 kg of water-based polyurethane varnish as an example, the raw material formula ratio adopts the middle value, and the product brand of Asahi Kasei, polycarbonate diol PCDL-T4691 (molecular weight: 1000), dimethylol Propionic acid, 1,10-decanediol, triethylamine, diethylenetriamine lower species.

[0076] formula:

[0077] Polycarbonate diol PCDL-T4691 (molecular weight 1000): 60.04 kg, H 12 DMI: 33.6 kg, bismuth sulfonic acid catalyst: 0.189 kg, dimethylolpropionic acid: 4.88 kg, 1,10-decanediol: 0.59 kg, acetone: 52.8 kg, triethylamine: 3.68 kg, antioxidant 1010: 0.54 kg, deionized water: 364 kg, diethylenetriamine: 0.48 kg, propylene glycol carbonate: 8 kg, double-terminated hydroxyl polyether modified silicone oil: 0.8 kg.

[0078] Its preparation method steps are as follows:

[0079] 1. Dehydration treatment of polycarbonate diol PCDL-T4691 (molecular weight: 1000)

[0080] Add the polycarbonate diol PCDL-T4691 into a dry stainless s...

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Abstract

The invention relates to a water-based polyurethane varnish and a method for preparing the same. The Water-based polyurethane varnish is prepared from the following raw materials: polycarbonate diol, diisocyanate, bismuth sulfonic acid based catalyst, carboxyl-containing diol, small-molecule diol, a tertiary-amine compound, acetone, antioxidant 1010, deionized water, an amine chain extender, propylene glycol carbonate and bis-terminal hydroxyl-polyether modified silicone oil. The process for preparing the water-based polyurethane varnish comprises the following steps: (1) dehydrating the polycarbonate diol; (2) synthesizing a prepolymer; (3) neutralizing the prepolymer; (4) extending chains and emulsifing; (5) distilling; and (6) compounding: adding and stirring the propylene glycol carbonate or bis-terminal hydroxyl-polyether modified silicone oil into the obtained water-based polyurethane emulsion to obtain the water-based polyurethane varnish coated on the surface of leather.

Description

technical field [0001] The invention belongs to the technical field of chemistry and relates to a leather surface finishing agent. Background technique [0002] Finishing is an important link in the leather manufacturing process. Finishing can increase the beauty and durability of leather, improve the grade of leather, increase the variety of designs and colors and expand the scope of use. [0003] Since water-based polyurethane uses water as the medium, it has the advantages of non-toxic, non-flammable, non-polluting, energy-saving, safe and reliable. Therefore, in recent years, water-based polyurethane emulsion has gained widespread attention and rapid development. Water-based polyurethane emulsion can make the surface of finished leather bright and smooth, water-resistant, solvent-resistant, friction-resistant, cold-resistant, and tortuous-resistant. It is currently a high-grade water-based varnish used by domestic tanneries. However, most of the water-based polyurethan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/653C08G18/76C08G18/66C08G18/44C08G18/61C08G18/12C08G18/22
Inventor 刘杰华刘文峰闫克辉张福义胡新霞马福兰刘娅林孙海园李扬
Owner SHANDONG TIANQING TECH DEV
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