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Aqueous polyurethane-acrylate resin for use as foaming material for synthetic leather and preparation method thereof

A technology of water-based polyurethane and acrylate, which is applied in the direction of textiles and papermaking, can solve the problems of environmental and human health hazards, low solid content of water-based polyurethane, process procedures, equipment and cost increase, etc., and achieve good mechanical foaming performance, The effect of stable emulsion performance and excellent mechanical properties

Active Publication Date: 2011-08-03
兰州科天水性科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the preparation process of most water-based polyurethane resins, the viscosity increase of the reaction system affects the polymerization stirring and the molecular weight of the polymer, so a certain amount of organic solvents such as acetone and methyl ethyl ketone must be added for dilution. In the subsequent process, although it can be Removal under reduced pressure, but the process, equipment and cost will increase, and the organic solvent recovery process will cause certain environmental pollution, and the solvent residue in the synthetic leather products will cause poor product quality, and the environmental protection standards will not meet the international high-grade synthetic leather. Require
[0004] Chinese Patent Application No. 200910131348.3 proposes high-solid foaming polyurethane resin for synthetic leather and its preparation method. Although a special sealing agent is added to improve the solid content of polyurethane, organic solvents such as butanone and DMF are added in the polymerization process. These organic solvents will bring certain harm to the environment and human health
In addition, DMF has a high boiling point, and incomplete removal will seriously affect the performance of the synthetic leather foam layer and the quality of synthetic leather products.
The foaming resin for synthetic leather proposed by Chinese Patent Announcement No. CN101705622A and Chinese Patent Publication No. CN101408001A all uses water as a solvent to avoid the use of organic solvents. It is environmentally friendly and low-toxic, but the solid content of water-based polyurethane is not high, and the emulsion itself foams The capacity is not high, need to add foaming agent

Method used

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  • Aqueous polyurethane-acrylate resin for use as foaming material for synthetic leather and preparation method thereof
  • Aqueous polyurethane-acrylate resin for use as foaming material for synthetic leather and preparation method thereof
  • Aqueous polyurethane-acrylate resin for use as foaming material for synthetic leather and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0022] 26 grams of castor oil-based polysiloxane polyol (Mn=2000) and 64 grams of polypropylene oxide polyol (Mn=2000) were dehydrated at 120° C. for 1 hour, added 23.5 grams of TDI, and reacted at 90° C. 4 hours; Add 6.8 grams of dimethylol propionic acid and 0.7 grams of ethylene glycol, react for 3 hours at 80 ° C, add 30 grams of hydroxypropyl acrylate and 15 grams of methyl methacrylate and 5 The acrylic acid dilution of gram, obtains the polyurethane prepolymer that end group is NCO group; The polyurethane prepolymer is transferred to the high-speed shear disperser, adds 5.2 grams of triethylene glycol under 800 rev / min high-speed shear and 20 ℃ of conditions The amine reacts for 2 minutes, increase the speed to 2500-4000 rpm and then add 340 grams of water. After 5 minutes, a polyurethane emulsion with NCO group as the end group is obtained; under the condition of stirring below 20 °C and 1000-1500 rpm , slowly add 19 grams of α, ω-amino-terminated polyoxypropylene (Mn=...

Embodiment 2

[0026] 16 grams of castor oil-based polysiloxane polyol (Mn=2000) and 74 grams of PTMG (Mn=2000) were dehydrated at 120°C for 1 hour, added 23.5 grams of MDI, and reacted at 90°C for 4 hours; gram of dimethylol butyric acid and 0.9 gram of butanediol, reacted for 3 hours at 80°C, added 30 grams of methyl methacrylate and 30 grams of butyl acrylate for dilution during the reaction, and the end group was NCO group Polyurethane prepolymer of agglomerate; Transfer the polyurethane prepolymer into high-speed shear disperser, add 5.2 grams of triethylamine to react for 2 minutes under high-speed shear of 800 rpm and 20°C, and increase the speed to 2500-4000 Then add 340 grams of water after 5 minutes to obtain a polyurethane emulsion with NCO groups at the end; slowly add 19 grams of α, ω-terminated amino groups under the condition of stirring below 20°C and 1000-1500 rpm After polyoxypropylene (Mn=600) carried out chain extension, after stirring for 5 minutes, water-based polyureth...

Embodiment 3

[0029]16 grams of castor oil-based polysiloxane polyol (Mn=2000) and 74 grams of PCL (Mn=2000) were dehydrated at 120°C for 1 hour, added 23.5 grams of HTDI, and reacted at 90°C for 4 hours; adding 6.8 The dimethylol valeric acid of 1 gram and the dimethylol cyclohexane of 0.9 gram were reacted at 80 ℃ for 3 hours, and 30 gram of hydroxyethyl acrylate and 30 gram of methacrylonitrile were added in the reaction process to dilute to obtain terminal The base is the polyurethane prepolymer of NCO group; The polyurethane prepolymer is transferred to a high-speed shear disperser, and 5.2 grams of triethylamine are added to react for 2 minutes at 800 rpm high-speed shear and 20°C, and the rotating speed is increased. Add 340 grams of water to 2500-4000 rpm and then add 340 grams of water. After 5 minutes, a polyurethane emulsion with NCO group as the end group is obtained; under the stirring condition of 1000-1500 rpm below 20 ° C, slowly add 24 grams of α , ω-amino-terminated polyox...

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Abstract

The invention discloses an aqueous polyurethane-acrylate resin for use as a foaming material for synthetic leather and a preparation method thereof. The aqueous polyurethane-acrylate resin has the structural characteristics that: the content of organosilicon element in the side chain of the molecule of the polyurethane is 3 to 7 percent; the content of a hydrophilic group in the side chain of the polyurethane is 1 to 3.5 percent; the content of a polyether and / or polyester and / or polybutadiene chain segment is 30 to 52 percent; and the content of a polyacrylate segment is 30 to 60 percent. The aqueous polyurethane-acrylate resin has the preparation characteristics that: a polymer material prepared by introducing siloxane into the side chain has high mechanical performance and high water resistance; and the use of alpha, omega-terminated amino polyoxypropylene as a chain extender improves the solid content of emulsion and the molecular weight of polyurethane- at the same time, and the introduced polyoxypropylene has high mechanical foaming performance. The aqueous polyurethane-acrylate resin prepared by the method disclosed by the invention is safe and environment-friendly, the emulsion is stable in performance and easy to foam, the foaming performance of the emulsion is high, and the aqueous polyurethane-acrylate resin is suitable for making the foamed layer of synthetic leather.

Description

technical field [0001] The invention belongs to the technical field of water-based polyurethane foaming materials, in particular to a water-based polyurethane-acrylate resin used for synthetic leather foaming materials and a preparation method thereof. Background technique [0002] The polymer chain of water-based polyurethane can make the resin have multiple functions: water resistance, solvent resistance, abrasion resistance, scratch resistance, wrinkle resistance, moisture permeability, air permeability and hand feeling are all better than those made of solvent-based resin Synthetic leather is closer to real leather. The use of water-based polyurethane resin to produce synthetic leather not only meets international environmental protection standards in terms of chemical properties, but also greatly improves the performance of synthetic leather in terms of physical properties. [0003] At present, in the preparation process of most water-based polyurethane resins, the vis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06N3/14C08G18/50C08G18/67C08G18/12C08G18/61
Inventor 戴家兵李维虎
Owner 兰州科天水性科技有限公司
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