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Waterborne polyurethane grouting material and preparation method thereof

A hydrophilic polyurethane and grouting technology, applied in chemical instruments and methods, other chemical processes, etc., can solve problems such as harming the health of construction workers, and achieve good results, avoid poison, and be environmentally friendly.

Inactive Publication Date: 2011-06-15
SHANGHAI DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect that the existing hydrophilic polyurethane grout contains a large amount of polyurethane prepolymer, organic solvent and free toluene diisocyanate belonging to hazardous chemicals, which endanger the health of construction workers, and provides a Environmentally-friendly hydrophilic polyurethane grout that does not contain organic solvents, is harmless to the human body, and can still ensure low viscosity, good permeability, and waterproof and plugging effect, and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 50g (0.2mol) of MDI-50 and 0.0037g of phosphoric acid (10ppm) into a reactor equipped with a stirring system and a thermometer. After starting stirring (stirring speed 150r / min), 320g (0.04mol) of hydrophilic Polyether polyol (using ethylene glycol as the initiator, EO / PO is 85 / 15, molecular weight Mn is 8000, functionality is 2) is gradually added into the reactor, the heating system is turned on, the temperature is raised to 80°C, and the pressure is Under the reaction 3h. The molar ratio of the isocyanate group in the isocyanate to the hydroxyl group in the hydrophilic polyether polyol is 1:0.2. The obtained product is liquid at room temperature, its isocyanate mass percentage content is 3.5%, and its viscosity is 300 mPa.s, which is the target product hydrophilic polyurethane grouting material.

Embodiment 2

[0021] Add 50g (0.2mol) of MDI-100 and 0.013g of phosphoric acid (20ppm) into a reactor equipped with a stirring system and a thermometer. After starting stirring (stirring speed 180r / min), 600g (0.1mol) of hydrophilic Add polyether polyol (using propylene glycol as the initiator, EO / PO is 80 / 20, molecular weight Mn is 6000, functionality is 2) into the reactor gradually, turn on the heating system, raise the temperature to 70°C, and react under normal pressure 4h. The molar ratio of the isocyanate group in the isocyanate to the hydroxyl group in the hydrophilic polyether polyol is 1:0.5. The obtained product is liquid at room temperature, its isocyanate content is 1.1%, and its viscosity is 500 mPa.s, which is the target product hydrophilic polyurethane grouting material.

Embodiment 3

[0023] Add 50g (0.2mol) of MDI-50 and 0.012g of acetic acid (50ppm) into a reactor equipped with a stirring system and a thermometer. After starting stirring (stirring speed 250r / min), 200g (0.02mol) of hydrophilic Non-reactive polyether polyol (using butylene glycol as the initiator, EO / PO is 75 / 25, molecular weight is 10000, functionality is 2) is gradually added into the reactor, filled with nitrogen for protection, the heating system is turned on, and the temperature is raised to 50°C , Reaction under normal pressure for 6h. The molar ratio of the isocyanate group in the isocyanate to the hydroxyl group in the hydrophilic polyether polyol is 1:0.1. The obtained product is liquid at room temperature, its isocyanate content is 6.0%, and its viscosity is 460 mPa.s, which is the target product hydrophilic polyurethane grouting material.

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Abstract

The invention discloses a preparation method of a waterborne polyurethane grouting material. The method is as follows: isocyanate, retarding agent and hydrophilic polyether polyol are mixed to react and obtain the finished product, wherein isocyanate is selected from diphenylmethane diisocyanate, liquefied diphenylmethane diisocyanate, polymethylene polyphenyl isocyanate isophorone diisocyanate, dicyclohexylmethylmethane-4,4'-diisocyanate, hexamethylene diisocyanate and polymethylene polyphenyl isocyanate or the mixture of toluene diisocynate and the isocyanates; and the degree of functionality of hydrophilic polyether polyol is 2-6, the ratio of ethylene oxide to propylene oxide is 99 / 1-60 / 40 and the molecular weight is 1000-20000. The invention also relates to the hydrophilic polyurethane grouting material prepared by the method. The preparation method of the invention is simple and convenient and has wide raw material sources; the prepared hydrophilic polyurethane grouting material does not contain organic solvent, thus avoiding the damage on the health of the constructor and promoting environmental protection; and the grouting material can have lower viscosity and good permeability and waterproof and leaking stoppage effect.

Description

technical field [0001] The invention relates to a hydrophilic polyurethane grouting material and a preparation method thereof. Background technique [0002] Polyurethane material is the fastest-growing polymer material after entering the 21st century. It is known as the "fifth largest plastic". Because of its excellent performance and adjustable properties, it is widely used in furniture and mattress industries, automobile industries, equipment Manufacturing industry, construction industry and other fields. Among them, the application development in the field of construction industry has attracted the most attention from the society, and it is widely used in the fields of building interior and exterior wall insulation, waterproof coatings, paving materials, construction adhesives, polyurethane grouting materials, etc. In recent years, domestic polyurethane grouting materials have been developed at an annual increment of 50%, and mainly hydrophilic polyurethane grouting mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/75C08G18/73C08G18/48C09K3/12
Inventor 杜辉王振波董建国于鹏程马立青
Owner SHANGHAI DONGDA CHEM
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