Silicone modified weak zwitterionic polyurethane emulsion and preparation method thereof

A technology of polyurethane emulsion and zwitterion, which is applied in the direction of improved hand-feeling fibers, wear-resistant fibers, textiles and papermaking, and can solve problems such as poor compatibility and compatibility, low stability, and large particle size of the emulsion, and achieve Easy to disperse and emulsify, good emulsion stability, good film elasticity

Active Publication Date: 2019-07-05
WUHAN TEXTILE UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0012] This method uses completely non-hydrophilic polybutadiene diol as polyurethane soft monomer and adopts non-ionic trifunctional small molecular monomer trimethylol propane as chain extender, which causes the product to be difficult to emulsify, and the emulsion particle size is relatively small. Large, wide particle size distribution and low stability; due to the poor hydrophilicity of the selected

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  • Silicone modified weak zwitterionic polyurethane emulsion and preparation method thereof

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preparation example Construction

[0066] The preparation method of the silicone-modified weak zwitterionic polyurethane emulsion of the present invention comprises the following steps:

[0067] (1) Prepolymerization: Prepolymerize diisocyanate with polyester polyol and / or polyether polyol, polymerization catalyst and optional hydroxyl-terminated polysiloxane to prepare a weakly zwitterionic polyurethane prepolymer;

[0068] (2) Chain extension: reacting the weak zwitterionic polyurethane prepolymer with a nonionic chain extender, an anionic chain extender, and some diluents to prepare a weak zwitterionic polyurethane intermediate;

[0069] (3) Capping: reacting the weak zwitterionic polyurethane intermediate with a silane coupling agent to obtain a silicone-modified weak zwitterionic polyurethane polymer;

[0070] (4) Emulsification: Mix and emulsify the silicone-modified weakly zwitterionic polyurethane polymer, neutralizer, remaining diluent, cationic chain extender, and water to prepare silicone-modified we...

Embodiment 1

[0117] (1) Prepolymerization

[0118] (1.1) Put polyester polyol and hydroxyl-terminated polysiloxane into the reactor and heat up to 75°C;

[0119] (1.2) Put in diisocyanate and keep stirring, control the temperature of the reaction system to 80°C, and react for 20 minutes;

[0120] (1.3) Maintain the temperature of the reaction system at 80°C, and put in the polymerization catalyst at a constant speed within 15 minutes;

[0121] (1.4) Raise the temperature and control the temperature of the reaction system to 92° C., and keep it warm for 90 minutes to prepare a silicone-modified weakly zwitterionic polyurethane prepolymer.

[0122] (2) Chain extension

[0123] (2.1) cooling the reaction system in step (1.4) to 85°C;

[0124] (2.2) Evenly add non-ionic chain extenders and anionic chain extenders within 20 minutes, and maintain the temperature at 85°C;

[0125] (2.3) Control the reaction temperature to 85°C and continue to stir the reaction for 170min. During this period, ...

Embodiment 2

[0138] (1) Prepolymerization

[0139] (1.1) Put the polyether polyol into the reactor and heat up to 80°C;

[0140] (1.2) Put in diisocyanate and keep stirring, control the temperature of the reaction system to 85°C, and react for 20 minutes;

[0141] (1.3) Maintain the temperature of the reaction system at 85°C, and put in the polymerization catalyst at a constant speed within 20 minutes;

[0142] (1.4) Raise the temperature and control the temperature of the reaction system to 89° C., and keep the temperature for 100 minutes to prepare a weakly zwitterionic polyurethane prepolymer.

[0143] (2) Chain extension

[0144] (2.1) cooling the reaction system in step (1.4) to 80°C;

[0145] (2.2) Evenly add non-ionic chain extender and anionic chain extender within 30 minutes, and maintain the temperature at 80°C;

[0146] (2.3) Control the reaction temperature to 80° C. and continue stirring for 150 minutes. During this period, add diluent not exceeding 80% of the total amount...

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Abstract

The invention relates to the field of textiles, and discloses a silicone modified weak zwitterionic polyurethane emulsion and a preparation method thereof. The preparation method comprises the following steps of raw material preparation including a polymerizing monomer, a modifying monomer, an auxiliary agent and water, pre-polymerization, chain extension, end-capping and emulsification to obtainthe siliconemodified weak zwitterionic polyurethane emulsion product. The preparation method has strong controllability and smooth process. The silicone modified weak zwitterionic polyurethane emulsion prepared by the method can be widely used for the function finishing processing of various textile products such as style hand feeling, surface decoration and anti-pilling performance. A polyurethane polymer has an appropriate amount of polyether side chain and a small amount of anionic and cationic groups, has excellent compatibility with various common textile chemicalsand is convenient and safe to use. A polyurethane polymer tail group is also introduced with an appropriate amount of cross-linking type active end capping, rubber film is elastic, a hand feeling is smooth and delicate, andthe silicone modified weak zwitterionic polyurethane emulsionhas a silicone style.

Description

technical field [0001] The invention relates to a weakly zwitterionic polyurethane emulsion for the finishing and processing of various textiles, such as style feel, surface finish, anti-pilling, etc., in particular to a silicone-modified weakly zwitterionic polyurethane emulsion and a preparation method thereof. Background technique [0002] Waterborne polyurethane polymers are more and more used in the finishing and processing of various textile products, such as style, surface finishing and anti-pilling surface effects. It is one of the most important development directions of textile auxiliaries in recent years. Due to the smoothness and softness of silicone polymers and the high elasticity and high elongation of polyurethane polymers, silicone-modified polyurethane polymers have become one of the most widely used water-based polymer materials in the field of textile processing. However, related products based on the prior art all have strong ionic properties, and are al...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/66C08G18/61C08G18/42C08G18/12C08G18/48C08G18/34C08G18/32D06M15/568D06M15/572
CPCC08G18/12C08G18/425C08G18/4829C08G18/4833C08G18/61C08G18/755D06M15/568D06M15/572D06M2200/35D06M2200/50C08G18/6692C08G18/48C08G18/348C08G18/3275
Inventor 权衡吴越李祥杨明星李青李时伟倪丽杰毕曙光熊伟
Owner WUHAN TEXTILE UNIV
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