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Preparation and use of cation aqueous polyurethane emulsion

A water-based polyurethane, cationic technology, applied in the direction of water repellent addition, pulp raw material addition process, textiles and papermaking, etc., can solve the problems of limiting the application of cationic polymers, and achieve good sizing effect, related performance improvement, and energy saving. Effect

Inactive Publication Date: 2009-05-27
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, cationic polymers cannot exist stably in the presence of acidic papermaking conditions and metal ions, which greatly limits the application of cationic polymers in paper surface sizing.

Method used

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  • Preparation and use of cation aqueous polyurethane emulsion
  • Preparation and use of cation aqueous polyurethane emulsion
  • Preparation and use of cation aqueous polyurethane emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add 60% (accounting for solid mass) of polyester diol (CMA-1024), 5% (accounting for solid mass) polyethylene glycol and 35% (accounting for solid mass) toluene diisocyanate (TDI) to the belt in a certain proportion In a reactor with a stirring and reflux device, under the protection of high-purity nitrogen, a prepolymerization reaction is carried out to prepare a prepolymer. The reaction time is 0.5h, and the reaction temperature is 45°C. Raise the temperature to 60°C, add 1,4-butanediol, react for 2 hours, detect the NCO-content of the system, when the NCO-content reaches the theoretical value, cool down to 50°C, add 5% (accounting for monomer mass) amount of pro- Add the water chain extender MDEA within 1 hour, and the chain extension reaction takes 2 hours. Chain extension reaction until the NCO- content reaches the theoretical value. After cooling to 20°C, add glacial acetic acid to neutralize and dilute with acetone. After the viscosity is suitable, add water and ...

Embodiment 2

[0042] The preparation of prepolymer, chain extension reaction and neutralization and emulsification steps, are identical with embodiment 1, difference is, in prepolymer preparation, the ratio of the substance amount of polyester diol and Polyethylene Glycol is 10 : 1, prepolymerization reaction temperature is 50 ℃, and reaction time 0.5h, chain extension reaction, is identical with embodiment 1, and difference is, heating up temperature is 55 ℃, is cooled to 55 ℃, and addition consumption 8% (accounting for monomer quality ) of the hydrophilic chain extender MDEA.

Embodiment 3

[0044] Prepolymer preparation, chain extension reaction and neutralization and emulsification steps, embodiment 1 is the same, difference is, in prepolymer preparation, the ratio of the substance amount of polyester diol and polyethylene glycol is 9:1 , the prepolymerization reaction temperature is 55°C, the reaction time is 2h, the reaction is 2.5h, and the chain extension reaction is the same as in Example 1, the difference is that the heating temperature is 60°C, and the temperature is lowered to 50°C, and the addition amount is 8% (accounting for a unit body weight) of the hydrophilic chain extender MDEA.

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Abstract

The invention relates to a method for preparing cationic waterborne polyurethane surface sizing agent capable of being used as paper and paperboard surface sizing agent. Toluene di-isocyanate (TDI), polyester dibastic alcohol, polyethylene glycol, 1,4-butanediol and N-methyldiethanolamine as a hydrophilic chain extender are selected to synthesize a cationic waterborne polyurethane emulsion by an internal emulsification method. The prepared polyurethane emulsion can be well used in cooperation with aluminum sulfate, poly aluminum and other aluminum salts. When the prepared polyurethane emulsion is used in cooperation with starch, aluminum salts and the like for the surface sizing of paper and paperboards, good sizing effects can be obtained, and the correlation of the paper and the paperboards can be greatly improved.

Description

technical field [0001] The invention relates to a preparation method of a cationic water-based polyurethane emulsion, in particular to a preparation method of a cationic water-based polyurethane surface sizing agent which can be used as a paper surface sizing agent. Background technique [0002] Known polyurethane is the product of the addition polymerization reaction of diisocyanate and polyol. With its non-toxic, non-flammable, oil resistance, high strength and film-forming properties, it is widely used in plastics, coatings, It has been widely used in many fields such as pigments and architecture, which has attracted the attention of the paper industry. [0003] At present, the known water-based polyurethane (WPU) is a water-based polyurethane dispersion system, and its water-based transformation can be mainly realized by two methods: forced emulsification and self-emulsification. The self-emulsification method is to introduce a hydrophilic group into the polyurethane pr...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/12C08J3/03C08L75/04D21H21/16D21H23/04
Inventor 胡惠仁徐建蜂查瑞涛
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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