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Method for synthesizing cellulose nitrate-polyurethane-polyacrylic acid(polyacrylate) composite emulsion

A technology of nitrocellulose and polyacrylate, which is applied in the direction of latex paint, etc., can solve the problems of single water-based nitrocellulose emulsion products, poor water resistance, and many homogeneous products

Inactive Publication Date: 2010-10-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of a large amount of surfactants, the water resistance of the coating film of the nitrocellulose composite emulsion prepared by this method is relatively poor, and the flexibility of the coating film needs to be improved.
At present, judging from the actual situation at home and abroad, the water-based nitrocellulose emulsion products are relatively single, and there are many homogeneous products, and they are mainly used in the field of leather finishing agents and other occasions that do not require high performance. Performance The synthesis method of nitrocellulose composite emulsion has not been reported at home and abroad

Method used

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  • Method for synthesizing cellulose nitrate-polyurethane-polyacrylic acid(polyacrylate) composite emulsion
  • Method for synthesizing cellulose nitrate-polyurethane-polyacrylic acid(polyacrylate) composite emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The raw materials and consumption of synthetic water-based nitrocellulose-polyurethane-polyacrylate composite emulsion are as follows:

[0035] Toluene diisocyanate (TDI) 39.2 kg

[0036] Polyoxypropylene glycol (PPG) 50.2 kg

[0037] 1,4-butanediol (BDO) 6.3 kg

[0038] Dimethylolpropionic acid (TMPA) 6.2 kg

[0039] Nitrocellulose (70%, acetone solvent) 121.1 kg

[0040] Triethylamine (TEA) 4.1 kg

[0041] Methyl methacrylate (MMA) 14.0 kg

[0042] Butyl acrylate (BA) 7.0 kg

[0043] Acrylic acid (AA) 0.2 kg

[0044] Azobisisobutyronitrile (AIBN) 0.2 kg

[0045] Acetone 20.9 kg

[0046] Isooctyl acetate 7.0kg

[0047] Water 337.6 kg

[0048] Total 642.4 kg

[0049] The synthesis steps are:

[0050] (1) Preparation of prepolymer: according to the above formula, 39.2 kg of TDI and 50.2 kg of dehydrated polyether glycol PPG are added to a 1000L reactor, and the material is stirred at a speed of 300 rpm and gradually Raise the temperature to 65°C, keep the re...

Embodiment 2

[0056] The raw materials and consumption of synthetic water-based nitrocellulose-polyurethane-polyacrylate composite emulsion are as follows:

[0057] Toluene diisocyanate (TDI) 53.0 kg

[0058] Polyoxypropylene glycol (PPG) 66.1 kg

[0059] 1,4-butanediol (BDO) 9.8 kg

[0060] Dimethylolpropionic acid (TMPA) 7.3 kg

[0061] Nitrocellulose (70%, acetone solvent) 38.0 kg

[0062] Triethylamine (TEA) 5.5 kg

[0063] Methyl methacrylate (MMA) 60.0 kg

[0064] Butyl acrylate (BA) 30.0 kg

[0065] Acrylic acid (AA) 4.5 kg

[0066] Azobisisobutyronitrile (AIBN) 0.5 kg

[0067] Acetone 89.2 kg

[0068] Isooctyl acetate 12.0 kg

[0069] Water 375.4 kg

[0070] Total 751.3 kg

[0071] The synthesis steps are:

[0072] (1) Preparation of prepolymer: according to the above formula, 53.0 kg of TDI and 66.1 kg of dehydrated polyether glycol PPG are added to a 1000L reactor, and the material is stirred at a speed of 30 rpm and gradually Raise the temperature to 60°C, keep the r...

Embodiment 3

[0078] The raw materials and consumption of synthetic water-based nitrocellulose-polyurethane-polyacrylate composite emulsion are as follows:

[0079] Toluene diisocyanate (TDI) 24.5 kg

[0080] Polyoxypropylene glycol (PPG) 30.6 kg

[0081] 1,4-butanediol (BDO) 3.2 kg

[0082] Dimethylolpropionic acid (TMPA) 11.1 kg

[0083] Nitrocellulose (70%, acetone solvent) 150.0 kg

[0084] Triethylamine (TEA) 7.3 kg

[0085] Methyl methacrylate (MMA) 90.0 kg

[0086] Butyl acrylate (BA) 30.0 kg

[0087] Acrylic acid (AA) 3.0 kg

[0088] Azobisisobutyronitrile (AIBN) 0.5 kg

[0089] Acetone 25.0 kg

[0090] Isooctyl acetate 4.0kg

[0091] Water 396.0 kg

[0092] Total 775.2 kg

[0093] The synthesis steps are:

[0094] (1) Preparation of prepolymer: According to the above formula, 24.5 kg of TDI and 30.6 kg of dehydrated polyether glycol PPG are added to a 1000L reactor, and the material is stirred at a speed of 100 rpm and gradually Raise the temperature to 65°C, keep the ...

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Abstract

The invention discloses a preparation method of cellulose nitrate-polyurethane-polyacrylic acid (ester) composite emulsion, which comprises using toluene diisocyanate, dealcoholized cellulose nitrate, polyether polyol, butanediol, dimethylol propionic acid and triethylamine as main raw materials, using step addition polymerization to synthesize anion polyurethane-cellulose nitrate water disperser, using the water disperser as seed emulsion, without any surface activator, via adding inducer to process in-site emulsion polymerization with polymer emulsion and emulsified acroleic acid monomer, to process polymerization and / or crosslink of pre-emulsified acroleic acid(ester) monomer in the seed emulsion seed and at surface, thereby preparing aqueous cellulose nitrate-polyurethane-polyacrylic acid (ester) composite latex particle with core-shell structure or interpenetrating polymer which can be used as filming polymer of high-performance aqueous wood dye.

Description

technical field [0001] The invention relates to the preparation of water-based coatings, more specifically, to a method for synthesizing water-based film-forming polymers for water-based wood coatings. Background technique [0002] In the field of wood coatings, solvent-based nitrocellulose lacquers with cellulose nitrate as a film-forming polymer have dominated wood coatings for many years, and are now widely used in wood coating industries at home and abroad. However, the volatile organic compounds (VOC) released during its production and construction seriously not only destroy the environment on which human beings live, but also waste precious resources. As a main environment-friendly coating, water-based coatings have increasingly become a research hotspot. Since the Second World War in the 20th century, the preparation technology of water-based nitrocellulose emulsion has been deeply studied and practically applied to the protection and finishing of porous substrates s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F285/00C08F2/38C08G18/10C08G18/76C08G18/48C08G81/00C09D5/02
Inventor 夏正斌叶代勇张心亚沈慧芳陈焕钦
Owner SOUTH CHINA UNIV OF TECH
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