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Preparation method of polysiloxane modified polyurethane water dispersion

A polyurethane water dispersion and polysiloxane technology, which is applied in the field of preparation of modified polyurethane materials, can solve the problems of lack of chemical crosslinking, poor mechanical properties of water-based polyurethane, water resistance, solvent resistance, heat resistance, and unsatisfactory gloss, etc. problem, to achieve the effect of good bending resistance and good water resistance

Active Publication Date: 2014-05-28
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when water-based polyurethane is synthesized, hydrophilic groups are introduced into the macromolecular structure. In addition, most water-based polyurethanes are linear polymers. Although there are physical cross-links formed by hydrogen bonds inside, they lack chemical cross-links. Therefore, the mechanical properties of water-based polyurethane are relatively poor. Poor, water resistance, solvent resistance, heat resistance and gloss are not ideal

Method used

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  • Preparation method of polysiloxane modified polyurethane water dispersion
  • Preparation method of polysiloxane modified polyurethane water dispersion
  • Preparation method of polysiloxane modified polyurethane water dispersion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Synthesis of prepolymer: In a three-necked flask equipped with a stirrer and a thermometer, 100 g of isophorone diisocyanate (IPDI) was added, and the temperature was raised until it melted. Then, add 1g of polyether 210 and polyether 220 that have been dehydrated, react at about 70°C for 30 minutes, add 3g of α-hydrogen-ω-hydroxyl-polydimethylsiloxane (M=1000), and react at the same temperature 30min. Then add 3.18g of dimethylolpropionic acid (dissolved in 10g N,N-dimethylformamide) into the reaction system, react at 70°C for 30min, then add 15g of ethylene glycol and react for 40min, take a sample, and use a standard The NCO content in the prepolymer was analyzed by di-n-butylamine back titration. When the isocyanate content reaches the set value (when the isocyanate content in the prepolymer reaches 40-80% of the initial value), the reaction is terminated to obtain an isocyanate group-terminated polyurethane prepolymer.

[0024] Preparation of aqueous dispersion: ...

Embodiment 2

[0030] Synthesis of prepolymer: In a three-necked flask equipped with a stirrer and a thermometer, 100 g of isophorone diisocyanate (IPDI) was added, and the temperature was raised until it melted. Then, add 3g of polyether 210 and polyether 220 that have been dehydrated, react at about 70°C for 30 minutes, add 5g of α-hydrogen-ω-hydroxyl-polydimethylsiloxane (M=2000), and react at the same temperature 30min. Then add 3.18g of dimethylolpropionic acid (dissolved in 10g N,N-dimethylformamide) into the reaction system, react at 70°C for 30min, then add 20g of ethylene glycol and react for 40min, take a sample, and use a standard The NCO content in the prepolymer was analyzed by di-n-butylamine back titration. When the isocyanate content reaches the set value (when the isocyanate content in the prepolymer reaches 40-80% of the initial value), the reaction is terminated to obtain an isocyanate group-terminated polyurethane prepolymer.

[0031] Preparation of aqueous dispersion: ...

Embodiment 3

[0036]The synthesis of prepolymer: in the there-necked flask that stirrer and thermometer are equipped with, add the isophorone diisocyanate (IPDI) of 100g, be heated to its fusing. Then, add 5g of polyether 210 and polyether 220 that have been dehydrated, react at about 70°C for 30 minutes, add 7g of α-hydrogen-ω-hydroxyl-polydimethylsiloxane (M=2000), and react at the same temperature 30min. Then add 3.18g of dimethylolpropionic acid (dissolved in 10g N,N-dimethylformamide) into the reaction system, react at 80°C for 25min, then add 25g of ethylene glycol and react for 40min, take a sample, and use a standard The NCO content in the prepolymer was analyzed by di-n-butylamine back titration. When the isocyanate content reaches the set value (when the isocyanate content in the prepolymer reaches 40-80% of the initial value), the reaction is terminated to obtain an isocyanate group-terminated polyurethane prepolymer.

[0037] Preparation of aqueous dispersion: cool the prepoly...

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Abstract

The invention relates to a preparation method of polysiloxane modified polyurethane water dispersion. According to the preparation method, IPDI (isophorone diisocyanate) is melted, then, polyether 210 and polyether 220 are added, and the mixture reacts for 25-30 min at the temperature of 70 DEG C-80 DEG C; a polysiloxane modifying agent is added, and the mixture reacts for 30 min; a dimethylol propionic acid solution is added, and the mixture reacts for 25-30 min at the temperature of 70 DEG C-80 DEG C; ethylene glycol is added, the mixture reacts for 40-60 min, and a modified polyurethane prepolymer is obtained; and the prepolymer is cooled to the room temperature, acetone is added, the mixture is uniformly stirred at the normal temperature, then, triethylamine is added, an acetone solution of the prepolymer is obtained and added into a water solution of diethylenetriamine after 15-30 minutes, the mixture is stirred and subjected to emulsification chain extension, acetone is removed, and the polysiloxane modified polyurethane water dispersion is obtained. The prepared polysiloxane modified polyurethane water dispersion has excellent water resistance, ageing resistance, weather resistance, high-low temperature resistance and chemical solvent resistance.

Description

technical field [0001] The invention belongs to the field of preparation of modified polyurethane materials, in particular to a preparation method of polysiloxane modified polyurethane water dispersion. Background technique [0002] Polyurethane (PU) is the abbreviation of polyurethane (polyurethane), and this type of polymer compound material contains a considerable number of carbamate groups (-NHCOO-). Polyurethane has the characteristics of good wear resistance, tear resistance, flex resistance, and excellent processing performance, and can be widely used in transportation, home appliances, machinery, construction, textiles, shoemaking, sports equipment and venues, agriculture, national defense It is a multifunctional polymer material. [0003] Polyurethane is divided into two categories: solvent-based polyurethane and water-based polyurethane. Solvent-based polyurethane is used in the textile industry. Some properties are better than water-based polyurethane, such as f...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/66C08G18/48C08G18/61C08G18/34C08G18/32C08G18/12C08G18/08
CPCC08G18/0823C08G18/12C08G18/4804C08G18/61C08G18/6692C08G18/755C08G18/3228
Inventor 蔡再生冯磊王俊刘惠林徐海明陈立文周归归李燕龙
Owner DONGHUA UNIV
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