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Skin-touch polyurethane leather surface treating agent and preparation method thereof

A technology of polyurethane leather and surface treatment agent, applied in the direction of fiber treatment, textile and papermaking, etc., to achieve the effect of strong skin feel and thick feeling, improving wear resistance and enhancing touch feeling

Active Publication Date: 2013-07-17
JIAXING HEXIN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing polyurethane treatment agents are mainly used to improve the appearance and feel of synthetic leather, such as improving the blackness, haze, and glossy surface of synthetic leather, and improving the waxy and smooth feeling of synthetic leather. There is no report on the polyurethane treatment agent for improving the skin feel of synthetic leather.

Method used

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  • Skin-touch polyurethane leather surface treating agent and preparation method thereof

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preparation example Construction

[0033] The preparation method of this skin feeling polyurethane leather surface treatment agent is as follows:

[0034] (1) Weigh the wax, silicone and solvent according to the proportion, add them into the reactor, and stir at room temperature for 20-40 minutes;

[0035] (2) Add 40% of the total amount of solvent-based PU resin, and stir at room temperature for 50-70 minutes;

[0036] (3) Add the remaining solvent-based PU resin and stir at room temperature for 50-70 minutes;

[0037] (4) Filtrate with a 120-mesh polypropylene net to obtain the finished product;

[0038] Described solvent type PU resin synthesis technique is:

[0039] (a) Add polyols, antioxidants and some solvents into the reaction kettle, raise the temperature to 50°C, and stir for 20-40 minutes;

[0040] (b) Add 70% of the total amount of diisocyanate according to the proportion, and react at 70-80°C for 1.5-3 hours;

[0041] (c) Add chain extender and reactive silicone, react at 70-80°C for 1-1.5 hour...

Embodiment 1

[0046] (1) Preparation of solvent-based PU: Add 150 g of polyols (50% by weight of polytetrahydrofuran diol, 25% of poly-1,4-butylene adipate diol, poly Caprolactone diol 25%, ), solvent (dimethylformamide) 225g, antioxidant (antioxidant 1010) 0.5g, heat up to 50°C, stir for 30min; add diisocyanate 49g (accounting for 70% of the total amount added %) (by weight isophorone diisocyanate 30%, hydrogenated diphenylmethane diisocyanate 70%), react at 70-80°C for 1h; add chain extender (1.4-butanediol) 16g and silicone ( Dihydroxy silicone) 10g, add 0.1g of catalyst stannous octoate, react at 70-80°C for 2h; cool down to 65°C, gradually add 21g of diisocyanate (diphenylmethane diisocyanate) (accounting for 30% of the total amount), to the resin Viscosity reached 120,000 cps / 25°C, and then 350.2g of solvent was added (including 30% dimethylformamide and 70% methyl ethyl ketone by weight), and finally 821.3g of polyurethane resin was obtained, with a solid content of 30% and a viscosi...

Embodiment 2

[0049](1) Preparation of solvent-based PU: Add 150 g of polyols (50% by weight of polyethylene adipate diol, 30% of polyoxypropylene diol, polyethylene adipate Diol-1,4-butanediol ester diol 20%, ), solvent (dimethylformamide) 225g, antioxidant (antioxidant 1010) 0.5g, heat up to 50°C, stir for 30min; add diisocyanate 56g (Diphenylmethane diisocyanate), react at 70-80°C for 2 hours; add 21.5g of chain extender (30% by weight of ethylene glycol, 30% of 1,6-hexanediol, 40% of neopentyl glycol) React with 7.5g of silicone (diamino silicone) at 70-80°C for 2h; add 0.1g of catalyst stannous octoate and react at 75°C for 1h; at 65°C, gradually add 24g of diisocyanate (diphenylmethane diisocyanate) to Resin viscosity reaches 118,000 cps / 25°C, then add (dimethylformamide) 369.3g. Finally, 863.4g of polyurethane resin was obtained, with a solid content of 30% and a viscosity of 67,000 cps / 25°C.

[0050] (2) Preparation of surface treatment agent: Add 6g of wax (including 3g of polyte...

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Abstract

The invention discloses a skin-touch polyurethane leather surface treating agent which is formed by mixing 30-40 parts by weight of solvent type PU (Polyurethane), 4-9 parts by weight of additive type organic silicon, 3-6 parts by weight of wax and 45-60 parts by weight of a solvent, wherein the solvent type PU is prepared from diisocyanate, polyhydric alcohols, an chain extender, reaction type organic silicon, an antioxidant and a catalyst at the presence of an organic solvent. The molar ratio of the diisocyanate, the polyhydric alcohols, the chain extender and the reaction type organic silicon used for preparing the solvent type PU is (3.5-4.5): (2-3.5): 1: (0.1-0.2). When used in synthetic leather, the skin-touch polyurethane leather surface treating agent can improve touch feeling of the synthetic leather obviously so that the synthetic leather has a very strong skin-touch performance and can improve scraping resistance, abrasion resistance and the like of the synthetic leather.

Description

technical field [0001] The invention relates to a surface treatment agent for synthetic leather, in particular to a skin-feeling polyurethane leather surface treatment agent and a preparation method thereof. Background technique [0002] As a class of synthetic polymer materials, synthetic leather can obtain various excellent properties by adjusting its chemical composition, and is widely used in the fields of automobiles, aviation and clothing. In recent years, with the improvement of people's living standards and aesthetic needs, synthetic leather products not only need to be durable, but also need to have a good appearance and touch, which makes people have higher requirements for polyurethane synthetic leather. Polyurethane treatment agent can closely bond with synthetic leather, and endow synthetic leather with uniform color, soft touch and high aesthetic feeling, making synthetic leather closer to genuine leather. Therefore, polyurethane treatment agents are increasin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/653D06M13/02D06M15/227D06M13/402D06M15/256D06M15/643D06M15/647D06M15/65D06M15/657C08G18/66C08G18/32
Inventor 陈利江雄知魏建平薛振华朱叶佳
Owner JIAXING HEXIN CHEM IND
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