Preparation method of polyurethane modified non-ironing resin with improved strong hand feeling
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A polyurethane modified, non-ironing resin technology, applied in the direction of improved hand feel fiber, textile and paper making, fiber treatment, etc.
Inactive Publication Date: 2020-10-20
ZIBO LURUI FINE CHEM CO LTD
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[0003] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art, to provide a method for preparing a strong handle-improved polyurethane-modified non-ironing resin, to modify the 2D resin by using polyurethane, and to overcome the disadvantages of the existing etherified 2D resin defects, giving the fabric a relatively soft feel and better strength, while having the non-iron effect of traditional resins
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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Embodiment 1
[0031] (1) Add 70.0g of urea and 189.2g of 37% formaldehyde to a container equipped with a thermometer, agitator, reflux device, and pH probe, raise the temperature and keep it at 50°C, and maintain pH 7.5 with 4.3g of 20% sodium hydroxide solution React under the condition of ~8.0 for 4 hours to obtain a colorless solution; the solution crystallizes at a low temperature of <10°C, filters and dries to obtain dimethylolurea;
[0032] (2) In a container equipped with a thermometer, a stirrer, and a reflux device, add 225.0 g of isophorone diisocyanate, 89.9 g of methyl ethyl ketone oxime, and 19.2 g of acetone, and react at 50° C. for 5 hours to obtain a polyurethane prepolymer;
[0033] (3) In a container equipped with a thermometer, a stirrer, and a distillation device, add 2900.0g propylene glycol polyoxyethylene polyoxypropylene ether (the polyoxyethylene ether part accounts for 60% of the total polyether moles), heat to 160°C and Vacuum distillation for 4 hours, then lower ...
Embodiment 2
[0038] (1) Add 70.0g of urea and 189.2g of 37% formaldehyde to a container equipped with a thermometer, stirrer, reflux device, and pH probe, raise the temperature and keep it at 45°C, and maintain pH 8.0 with 4.6g of 20% sodium hydroxide solution Reaction under the condition of ~8.5 for 5 hours, a colorless solution was obtained; the solution was crystallized at a low temperature <10°C, filtered and dried to obtain dimethylolurea;
[0039] (2) Add 170.0g of hexamethylene diisocyanate, 99.1g of 3,5-dimethylpyrazole, and 33.2g of acetone into a container equipped with a thermometer, a stirrer, and a reflux device, and react at 50°C for 4 hours to obtain Polyurethane prepolymer;
[0040] (3) In a container equipped with a thermometer, a stirrer, and a distillation device, add 4000.0 g of propylene glycol polyoxyethylene polyoxypropylene ether (the polyoxyethylene ether part accounts for 70% of the total polyether moles), heat to 160 ° C and Vacuum distillation for 3 hours, then...
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Abstract
The invention belongs to the technical field of preparation of textile assistants, and particularly relates to a preparation method of polyurethane modified non-ironing resin with improved strong handfeeling. The preparation method comprises the following steps: preparing dimethylol urea from urea and formaldehyde; preparing a polyurethane prepolymer from aliphatic diisocyanate and a sealing agent, carrying out a reaction on propylene glycol polyoxyethylene polyoxypropylene ether, the polyurethane prepolymer and a catalyst, adding the dimethylol urea and dioxane, and carrying out a reaction;and finally adding glyoxal, continuously reacting, and adding water to adjust the water content after the reaction is finished so as to obtain the product. According to the invention, the product of areaction of a polyoxyethylene polyoxypropylene ether block copolymer and isocyanate is cross-linked with a traditional 2D resin, wherein the polyether block is attached to the surface of the fiber soas to enhance the lubricity of the fiber, improve the hand feeling of the fabric and make the fiber slide within a limited range when being stressed to achieve the purpose of reducing strength loss,and the effectiveness of cross-linking of resin and cellulose is ensured through polyhydroxy structures at the two ends, so that the non-ironing property is still good.
Description
technical field [0001] The invention belongs to the technical field of preparation of textile auxiliaries, and in particular relates to a preparation method of a strong handle-improving polyurethane modified non-ironing resin. Background technique [0002] Non-ironing resin is widely used in cotton fabrics such as shirt fabrics and denim fabrics, which can endow garments with non-ironing and anti-wrinkle properties. However, traditional non-ironing resins mostly use 2D urea-formaldehyde resin (dimethylol dihydroxyethylene urea). The hydroxyl groups in this resin can react with the hydroxyl groups of cellulose to form a cross-linked network structure on the surface of the fabric to prevent the relative slippage of cellulose. , so that wrinkles are not easy to form. However, when the cellulose is subjected to an external force, it cannot pass the relative slip dispersion force, resulting in a decrease in the strength of the fabric. At the same time, the rigid urea-formaldehy...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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