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Organic silicon modified waterborne polyurethane leather coating agent and preparation method

A leather finishing agent, water-based polyurethane technology, applied in the direction of polyurea/polyurethane coating, leather surface treatment, small raw hide/large raw hide/leather/fur treatment, etc. Significant changes, etc., to achieve the effect of uniform and stable emulsion, improved water resistance, and convenient operation

Inactive Publication Date: 2015-02-18
FOSHAN CENT FOR FUNCTIONAL POLYMER MATERIALS & FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, although the amount of siloxane added can reach more than 70%, the stability of the emulsion after modification is good, but the siloxane chain segment is soft, and the mechanical properties of the material do not change significantly, so it is difficult to meet the wear-resistant and durable requirements of leather finishing.

Method used

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  • Organic silicon modified waterborne polyurethane leather coating agent and preparation method
  • Organic silicon modified waterborne polyurethane leather coating agent and preparation method
  • Organic silicon modified waterborne polyurethane leather coating agent and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0121]Add 16.05g of IPDI, 40.00g of PPG2000, 4.61g of castor oil, and 2.12g of hydroxypropyl silicone oil after dehydration into a four-necked flask equipped with an electric stirrer and a reflux condenser, and add 3 to 5 drops of dilauric acid dilaurate Butyl tin, react at 80°C for 2~3h to obtain a siloxane-modified prepolymer. Add 3.87g of DMPA and 15g of acetone to the prepolymer, and continue to react at 80°C for 3~4h to obtain a prepolymer with hydrophilic terminal isocyanate groups. Then lower the temperature to 50°C, add 2.92gTEA to neutralize and form a salt, and stir for 30min. Dissolve 1.00 g of ethylenediamine in 164.66 g of deionized water, slowly add it to the high-speed shear prepolymer, emulsify and disperse for 30 minutes, and finally distill off the acetone under reduced pressure to obtain a silicone-modified water-based polyurethane emulsion.

[0122] The appearance of the prepared emulsion is milky white with slight bluish light. After being centrifuged in...

Embodiment 2

[0125] Add 16.05g of IPDI, 40.00g of PPG2000, 4.61g of castor oil, and 3.60g of hydroxypropyl silicone oil after dehydration into a four-necked flask equipped with an electric stirrer and a reflux condenser, and add 3 to 5 drops of dilauric acid dilaurate Butyl tin, react at 80°C for 2~3h to obtain a siloxane-modified prepolymer. Add 3.87g of DMPA and 15g of acetone to the prepolymer, and continue to react at 80°C for 3~4h to obtain a prepolymer with hydrophilic terminal isocyanate groups. Then lower the temperature to 50°C, add 2.92gTEA to neutralize and form a salt, and stir for 30min. Dissolve 1.00 g of ethylenediamine in 168.13 g of deionized water, slowly add it to the high-speed shear prepolymer, emulsify and disperse for 30 minutes, and finally distill off the acetone under reduced pressure to obtain a silicone-modified water-based polyurethane emulsion.

[0126] The appearance of the prepared emulsion is milky white with slight bluish light. After being centrifuged i...

Embodiment 3

[0128] Add 16.05g of IPDI, 40.00g of PPG2000, 4.61g of castor oil, and 5.15g of hydroxypropyl silicone oil after dehydration into a four-necked flask equipped with an electric stirrer and a reflux condenser, and drop 3 to 5 drops of dilauric acid dilaurate Butyl tin, react at 80°C for 2~3h to obtain a siloxane-modified prepolymer. Add 3.87g of DMPA and 15g of acetone to the prepolymer, and continue to react at 80°C for 3~4h to obtain a prepolymer with hydrophilic terminal isocyanate groups. Then lower the temperature to 50°C, add 2.92gTEA to neutralize and form a salt, and stir for 30min. Dissolve 1.00 g of ethylenediamine in 171.75 g of deionized water, slowly add it to the high-speed shear prepolymer, emulsify and disperse for 30 minutes, and finally distill off the acetone under reduced pressure to obtain a silicone-modified water-based polyurethane emulsion.

[0129] The appearance of the prepared emulsion is milky white with bluish light. After being centrifuged in a de...

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Abstract

The invention discloses an organic silicon modified waterborne polyurethane leather coating agent which comprises the following raw materials in parts by weight: 30-50 parts of polyether polyol, 10-30 parts of isocyanate, 1-8 parts of castor oil, 0.1-11 parts of end hydroxyalkyl polydimethylsiloxane, 0.01-1 part of a catalyst, 1-10 parts of a hydrophilic chain extender, 5-25 parts of an organic solvent, 1-5 parts of a salt-forming agent, 1-3 parts of a small-molecule chain extender and 120-250 parts of deionized water. Correspondingly, the invention further provides a method for preparing the organic silicon modified waterborne polyurethane leather coating agent. By adopting the organic silicon modified waterborne polyurethane leather coating agent, properties such as the water resistance, the cold resistance, the solvent resistance and the surface property of synthesized waterborne polyurethane are all remarkably improved, the process is simple, the operation is convenient, the prepared emulsion is uniform and stable, no sediment is generated in the water dispersion and storage process, a coating film is transparent and bright, and the application prospect in leather coating is wide.

Description

technical field [0001] The invention relates to the technical field of leather finishing agents, in particular to an organosilicon-modified waterborne polyurethane leather finishing agent and a preparation method thereof. Background technique [0002] Finishing is an important process in the leather manufacturing process. Finishing can increase the appearance of leather, protect leather, prolong the service life and improve the grade of leather. Among all kinds of finishing agents, water-based polyurethane leather finishing agents have the advantages of non-toxicity, safety, and environmental friendliness. They have good leveling properties during finishing, good film-forming performance, and strong covering ability. After finishing, the leather surface is smooth, bright and comfortable, which can greatly improve the grade of finished leather and is widely used. Due to the hydrophilic groups on the molecular chain and the characteristics of its own structure, the one-compon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/67C08G18/66C08G18/48C08G18/61C08G18/34C08G18/12C09D175/14C09D175/08C14C11/00
CPCC08G18/12C08G18/3206C08G18/3228C08G18/348C08G18/36C08G18/61C08G18/6674C08G18/6685C08G18/6692C08G18/6696C14C11/006
Inventor 庞浩李海涛廖兵李朋娟马哲董楠蔡嘉莉黄晓琳梁锦华
Owner FOSHAN CENT FOR FUNCTIONAL POLYMER MATERIALS & FINE CHEM
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