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Preparation method of anionic aqueous polyurethane dispersoid for fabric coating and decoration
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A water-based polyurethane, anionic technology, applied in textiles, papermaking, fiber processing, etc., can solve the problems of deepening yellowing of color and yellowing of products
Inactive Publication Date: 2013-09-04
JIAXING UNIV +1
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However, aromatic ring diamines are easy to cause yellowing of the product, which is mainly due to the fact that the benzene ring is an electron-rich conjugated structure, which is easily oxidized into quinones and causes the color to deepen and yellow.
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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
[0033] Polytetrahydrofuran ether glycol 2000 (that is, the number average molecular weight is 2000, referred to as PTMEG2000, the same below) 42.9g, polytetrahydrofuran ether glycol 1000 (that is, the number average molecular weight is 1000, referred to as PTMEG1000, the same below) 21.5g, polycarbonate Ester diol 2000 (that is, the number average molecular weight is 2000, referred to as PCD2000, the same below) 14.4g, dicyclohexylmethane diisocyanate (abbreviated as H 12 MDI, hereinafter the same) 35.3g, catalyst stannous octoate (abbreviated as T-9, hereinafter the same) 0.05g, in a 500mL four-neck flask, heated to 70°C, reacted for 2.5h, cooled to 60°C, added 2-(( 3.3 g of sodium 2-aminoethylamino)methyl)pyridine-4-carboxylate and 80.0 g of acetone were reacted for 25 minutes to prepare a polyurethane prepolymer. Then cool down to 40°C, add ethylenediamine 2.2g, water 120.0g, emulsify under high-speed stirring for 0.5h, and finally, evaporate the solvent acetone under reduc...
Embodiment 2
[0035] PTMEG200087.5g, PCD200014.4g, H 12 MDI 28.2g, catalyst T-90.06g, in a 500mL four-necked flask, heated to 70°C, reacted for 3h, cooled to 60°C, added 2-((2-aminoethylamino)methyl)pyridine-4-sodium carboxylate 3.3 g and 70.0 g of acetone were reacted for 25 minutes to obtain a polyurethane prepolymer. Then lower the temperature to 40°C, add 0.9g of ethylenediamine and 120.0g of water, emulsify for 0.5h under high-speed stirring, and finally, evaporate the solvent acetone under reduced pressure to obtain the pyridinecarboxylic acid type anionic waterborne polyurethane dispersion WPU2.
Embodiment 3
[0037] PTMEG2000 80.0g, PCD2000 20.0g, H 12 MDI 35.3g, catalyst T-90.13g, in a 500mL four-necked flask, heated to 75°C, reacted for 2h, cooled to 60°C, added 2-((2-aminopropylamino)methyl)pyridine-4-sodium carboxylate 3.7 g and 80.0 g of acetone were reacted for 25 minutes to obtain a polyurethane prepolymer. Then lower the temperature to 35°C, add ethylenediamine 2.2g, water 120.0g, emulsify under high speed stirring for 0.5h, finally, distill off the solvent acetone under reduced pressure to obtain pyridine carboxylic acid type anionic waterborne polyurethane dispersion WPU3.
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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Abstract
The invention relates to a preparation method of an anionic aqueous polyurethane dispersoid for fabric coating and decoration. The preparation method is operated according to the following steps that: (a) polyether polyol, polyester polyol and diisocyanate are subjected to polymerization reaction for 2 to 4 hours at 70 to 90 DEG C under the effect of catalysts; (b) acetone solvents and diamine hydrophilic chain extenders containing picolinic acid structures are added for taking reaction for 5 to 30 minutes at 40 to 65 DEG C, and polyurethane prepolymers are prepared; (c) the temperature is lowered to 20 to 40 DEG C, low-molecular-weight chain extenders and water are added and are emulsified through being stirred at high speed; (d) the acetone solvents are removed through reduced pressure distillation, and the anionic aqueous polyurethane dispersoid for fabric coating and decoration is obtained. Because diamine containing the picolinic acid structures is used as hydrophilic chain extenders, the regular pyridine ring structure is contained, the crystallization performance and the initial bonding intensity can be improved, meanwhile, a pyridine ring is an electron deficiency system, the color deepening caused by oxidation cannot easily occur, and the product has the yellowing resistance performance.
Description
technical field [0001] The invention relates to a preparation method of a pyridine carboxylic acid type anionic fabric finishing agent, and a preparation method of an anionic aqueous polyurethane dispersion for fabric finishing. Background technique [0002] Waterborne polyurethane has the advantages of non-combustibility, low odor, no pollution to the environment and easy operation and processing. It is an environmentally friendly polymer material and is widely used in coatings, adhesives, leather and fabric coatings and other fields. In the application of fabric coating, water-based polyurethane is mainly used in the coating of nylon, silk, cotton, canvas, polyester-cotton and other fabrics. After coating, the fabric has the advantages of waterproof and moisture-permeable, soft surface, high elasticity, and full hand feeling. [0003] As a water-based polyurethane for fabric coating, it is generally required to have good softness and smoothness after drying and curing, but...
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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Application Information
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