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A low modulus waterborne polyurethane material

A water-based polyurethane, low-modulus technology, applied in the field of polyurethane materials, can solve the problems of the adverse effect of product elongation at break, lack of strength and elongation at break, glove feel hard, and achieve soft feel, prevent back-sticking, Easy to wear effect

Active Publication Date: 2017-12-26
山东惠沃盛健康科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

Although the modulus of this polyurethane has been greatly reduced, compared with rubber products, there is still a big gap. The gloves made of this polyurethane feel hard, and the strength and elongation at break are also lacking.
[0005] CN101585903A (disclosure date is November 25, 2009) discloses a kind of preparation method of the polyurethane material of low modulus, and it uses cycloaliphatic diisocyanate and polyester polyol to carry out the preparation of prepolymer, and the obtained dispersion Overcomes the disadvantages of traditional low modulus back tack
However, this method requires three chain extensions, the process is complex, and the polyester polyol used will adversely affect the elongation at break of the product

Method used

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  • A low modulus waterborne polyurethane material
  • A low modulus waterborne polyurethane material

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preparation example Construction

[0035] (1) Preparation of polyurethane dispersion (by the material of mass parts shown in Table 1)

[0036] Step 1, put polymer diol (polytetrahydrofuran diol 3000, polypropylene glycol 2000), hydrophilic monomer dimethylolpropionic acid (DMPA) and cosolvent N-methylpyrrolidone (NMP) into the reaction kettle , Vacuum dehydration above 100℃ for more than 1h;

[0037] Step 2, the temperature of the reactor is lowered to below 90°C, adding toluene diisocyanate (TDI), adding catalyst organotin, raising the temperature, and reacting;

[0038] Step 3, cooling down to below 55°C, adding neutralizing agent triethylamine and diluting solvent acetone;

[0039] Step 4: Place in a stirring line with a linear speed of 8m / s, add deionized water, add chain extender ethylenediamine, continue to stir for 10min, heat up to 60°C, vacuum the solvent for more than 1h, cool, filter, pack, and obtain Polyurethane dispersions, that is, low modulus waterborne polyurethane materials (such as figure ...

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Abstract

The invention relates to a novel low-modulus waterborne polyurethane material. The material is prepared according to the following steps: step (1), putting polymer diol, a hydrophilic monomer and a cosolvent in a reaction kettle, and dehydrating in vacuum; step (2), cooling the reaction kettle, adding diisocyanate, heating and reacting; step (3), cooling and adding a neutralizing agent and a diluting solvent; step (4), stirring and adding deionized water, stirring continuously, heating, pumping the solvent in vacuum, cooling and filtering to obtain a polyurethane dispersoid, namely obtaining the novel low-modulus waterborne polyurethane material. The polyurethane dispersoid is used for preparing gloves of which the modulus is lower than that of a product prepared by the prior art; the prepared gloves are approximate to a rubber product, easy to wear, soft in hand feeling, good in air permeability, higher than an existing product and the rubber product in breaking strength, better than the existing technical products in rebound resilience and larger than the rubber product in elongation at break; therefore, the novel low-modulus waterborne polyurethane material provided by the invention can be totally used as a potential substitute product for the rubber product in performance.

Description

technical field [0001] The invention relates to a polyurethane material, in particular to a low-modulus water-based polyurethane material. Background technique [0002] Glove products include medical gloves, examination gloves, household gloves, industrial gloves and fabric gloves, which are mainly made of natural rubber, neoprene rubber, nitrile rubber and polyisoprene rubber as raw materials. Natural rubber has always dominated the market due to its cost advantage, but the protein in natural rubber is likely to cause allergies to some people during use, especially Caucasians, so for scientific and technological workers, it is particularly important to develop materials that replace natural rubber urgent. Compared with nitrile rubber, polyurethane material not only has simple molding process, but also has excellent performance; compared with neoprene rubber and polymerized isoprene, polyurethane material has cost advantages. Therefore, polyurethane materials have certain ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/34C08G18/12C08G18/08C08L75/08
Inventor 陈强
Owner 山东惠沃盛健康科技有限公司
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