Preparation method of waterborne polyurethane coating and adhesive modified by graphene and rare earth
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A water-based polyurethane and rare earth modification technology, used in polyurea/polyurethane coatings, adhesives, fire-retardant coatings, etc.
Inactive Publication Date: 2015-07-22
段宝荣
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In the field of flame retardants, there is no precedent for the application of rare earth elements. How to combine rare earth elements and halogen-free flame retardants to meet the requirements of low toxicity, low smoke and harmlessness while taking into account the flame retardant effect is an update. research direction
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[0021] detailed description Below in conjunction with example further illustrate the present invention.
example 1
[0023] (1) In a 500ml four-necked flask equipped with a stirring blade, a thermometer, and a condenser tube, add 92g of tetrakis hydroxymethylphosphorus sulfate and 44g of aqueous sodium hydroxide solution with a mass fraction of 20%, react at 80°C for 2h, and then Add 272 g of ytterbium chloride aqueous solution and 2 g of pentoxyverine with a mass fraction of 20%, adjust the pH value of the solution to 7-8 with a mass fraction of 20% sodium hydroxide solution, stir at 20° C. for 3 h, and after the reaction, Filtration, drying, and crushing to more than 3000 meshes, 96.2g of ytterbium phosphorus flame retardant can be obtained;
[0024] (2) Put 60g of the above-mentioned (1) ytterbium phosphorus flame retardant and 30g of hexamethylene diisocyanate into a 500ml four-neck flask equipped with a stirring blade, a thermometer, and a condenser tube. Under the conditions, react at 70°C for 2 hours, then add 0.1 g of sodium glucoheptonate, and react at 70°C for 30 minutes to obtain ...
example 2
[0029] (1) In a 500ml four-necked flask equipped with a stirring blade, a thermometer, and a condenser tube, add 92g of tetrakis hydroxymethyl phosphorus sulfate and 44g of aqueous sodium hydroxide solution with a mass fraction of 20%, react at 80°C for 2h, and then Add 272g of 20% ytterbium chloride aqueous solution and 2g of pentoxyverine, then use 20% sodium hydroxide to adjust the pH value of the solution to 7-8, stir at 30°C for 3h, and filter after the reaction , dried, crushed to more than 3000 mesh, 96.2g of ytterbium phosphorus flame retardant can be obtained;
[0030] (2) Put 60g of the above-mentioned (1) ytterbium phosphorus flame retardant and 15g of hexamethylene diisocyanate into a 500ml four-neck flask with a stirring blade, a thermometer, and a condenser tube, and put them in the presence of 0.53g of dibutyltin dilaurate Under the conditions, react at 90°C for 3 hours, then add 0.15 g of sodium glucoheptonate, and react at 90°C for 30 minutes to obtain 75.1 g ...
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Abstract
The invention discloses a preparation method of waterborne polyurethane coating and adhesive which are modified by graphene and rare earth. The preparation method of the waterborne polyurethane coating and adhesive which are modified by graphene and rare earth comprises the following steps: in presence of a dibutyltin dilaurate catalyst, mixing a ytterbium phosphorus flame retardant with hexamethylene diisocyanate, carrying out reaction for 2-3 hours at the temperature of 70-90 DEG C, adding sodium glucoheptonate, and carrying out reaction for 30 minutes at the temperature of 70-90 DEG C, so that a polyurethane prepolymer is obtained; adding a hydrophilic chain extender and butanone into the polyurethane prepolymer, carrying out reaction for 1-3 hours at the temperature of 70-80 DEG C, adding triethylamine for carrying out reaction for 30-60 minutes, and adding water for emulsifying, so that hydrophilic polyurethane is formed; adding a graphene dispersion liquid and phospholipid into the hydrophilic polyurethane, and shearing and stirring for 60-90 minutes under the condition that pH value is 7, so that the waterborne polyurethane coating and adhesive which are modified by graphene and rare earth are obtained, and fire resistance and mechanical properties of the obtained polyurethane coating and adhesive are greatly improved.
Description
[0001] Technical field The present invention relates to a preparation method of water-based polyurethane coating and adhesive, in particular to a preparation method of graphene and rare earth modified water-based polyurethane coating and adhesive, the main purpose of which is to improve the flame retardancy of water-based polyurethane . Background technique [0002] Water-based polyurethane (also known as water-based polyurethane) is a polyurethane resin containing hydrophilic groups in the molecular chain of polyurethane, which has a strong affinity with water. It can be dispersed in water and formed by using a specific process. stable system. Water-based polyurethane is mainly used in leather finishing, textile printing and dyeing, papermaking, architectural coatings, adhesives, etc. Almost all of the materials involved are flammable materials. If these materials are not treated with flame retardant, they will inevitably become a fire hazard. . The flame retardancy of wate...
Claims
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Application Information
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