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Preparation method for nitrated cellulose-modified waterborne polyurethane resin

A technology of water-based polyurethane and nitrocellulose, which is applied in the field of preparation of water-based polyurethane resin, to achieve the effects of good physical properties, improved grades, and increased appearance and feel

Active Publication Date: 2012-06-20
JIAXING HEXIN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The application of nitrocellulose to waterborne polyurethane resin has not been reported yet

Method used

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  • Preparation method for nitrated cellulose-modified waterborne polyurethane resin

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[0009] The preparation method of this nitrocellulose modified waterborne polyurethane resin comprises the following steps:

[0010] (1) After heating and stirring excess diisocyanate and polyglycol in a reaction vessel for a period of time, add an organotin catalyst and heat up to 85-100° C. for 1.5-3 hours;

[0011] (II) After the first step reaction is completed, add low molecular weight non-hydrophilic chain extender and hydrophilic chain extender to carry out the chain extension reaction, the reaction temperature is 75 ~ 80 ° C; as the viscosity of the reaction system increases, Add acetone solvent to reduce the viscosity, maintain the viscosity at 3000-4000cps, keep the temperature of the reaction system at 60-75°C, and control the reaction time to 3-6h;

[0012] (III) After the above-mentioned prepolymerization reaction is finished, add the acetone solution of nitrocellulose in it, after stirring evenly, then add neutralizer, water and diamines rear chain extender succes...

Embodiment 1

[0019] (a) Raw material ratio

[0020] Isocyanate: toluene diisocyanate 60g;

[0021] Polyol: polyoxypropylene diol (molecular weight 2000) 200g;

[0022] Chain extender: dimethylolpropionic acid 14g;

[0023] Neopentyl glycol 2g;

[0024] Trimethylolpropane 1g;

[0025] Solvent: acetone 120g;

[0026] Modifier: nitrocellulose 3g;

[0027] Neutralizer: 10g of triethylamine;

[0028] Post-chain extender: 6.4g of isophorone diamine;

[0029] Water: 685g.

[0030] (b) Preparation process

[0031] (1) drop into polyoxypropylene glycol 200g in four-necked reaction flask, heat to 65 ℃ under stirring condition; Drop into toluene diisocyanate 60g, add 0.15g stannous octoate catalyst after stirring for 10min, prepolymerization temperature is controlled at 90 ℃ reaction 2 hours;

[0032] (II) Add 14g of 2,2-dimethylolpropionic acid, 2g of neopentyl glycol, and 1g of trimethylolpropane, and control the reaction temperature at 80°C for 1 hour;

[0033] (III) add...

Embodiment 2

[0036] (a) Raw material ratio

[0037] Isocyanate: diphenylmethane diisocyanate 97.5g;

[0038] Polyol: polytetrahydrofuran diol (molecular weight 2000) 210g;

[0039] Chain extender: Dimethylolpropionic acid 16.98g;

[0040] Diethylene glycol 7.28g;

[0041] Solvent: acetone 160g;

[0042] Modifier: nitrocellulose 2.65g;

[0043] Neutralizer: 13.55g of triethylamine;

[0044] Post-chain extender: 8.46g of isophorone diamine;

[0045] Water: 823g.

[0046] (b) Preparation process

[0047] (1) drop into polytetrahydrofuran diol 210g in the reactor, be heated to 70 ℃ under stirring condition; Drop into diphenylmethane diisocyanate 97.5g, add 0.15g stannous octoate catalyst after stirring 10min, prepolymerization temperature is controlled at 95 ℃ React for 1.5 hours;

[0048] (II) Add 16.98g of dimethylolpropionic acid and 7.28g of diethylene glycol, and control the reaction temperature at 78°C for 1h;

[0049] (III) add 160g acetone to reduce viscosity; Tempera...

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Abstract

The invention discloses a preparation method for nitrated cellulose-modified waterborne polyurethane resin. The preparation method comprises the following steps of: (I) adding excessive diisocyanate and poly-dibasic alcohol into an organic tin catalyst, heating, and reacting; (II) after a reaction in the step (I) is completed, adding a non-hydrophilic chain extender and a hydrophilic chain extender with low molecular weights for reacting, adding acetone solvent for lowering viscosity along with continuous increase in the viscosity of the reaction system, and keeping the viscosity at 3000-4000cps; and (III) after the prepolymerization reaction is completed, adding an acetone solution of nitrated cellulose, uniformly stirring, adding a neutralizing agent, water and a post chain extender, emulsifying under the action of high-speed stirring shearing force to form an emulsion, and distilling for removing acetone to obtain the nitrated cellulose-modified waterborne polyurethane resin. The prepared waterborne polyurethane resin has high physical performance, hydrolysis resistance and solvent resistance; and when the waterborne polyurethane resin is taken as a coating agent, the attractiveness and handfeel of leather are enhanced, and the level of the leather is raised.

Description

technical field [0001] The invention relates to a preparation process of water-based polyurethane resin, and a preparation method of nitrocellulose-modified water-based polyurethane resin. Background technique [0002] Water-based polyurethane, also known as water-based polyurethane, is a polyurethane resin that introduces hydrophilic groups into the polyurethane molecular chain, so it has a strong affinity with water. It is a secondary component of polyurethane particles dispersed in the continuous phase (water). metacolloid system. Compared with solvent-based polyurethane, it has excellent properties such as solvent-free, pollution-free, and flame-retardant, and has gradually become an important direction for the development of the polyurethane industry. In recent years, with people's continuous research, water-based polyurethanes with various properties have been developed, which are widely used in adhesives, coatings, fabric finishing agents, etc. Among them, finishing ...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/32C08G18/34C08G18/12C08L75/04C08L1/18
Inventor 牛瑞媛石磊沈连根徐欣欣纪尚超沈海忠文远海
Owner JIAXING HEXIN CHEM IND