High-stripping hydrolysis-resistant polyurethane resin and preparation method thereof

Abstract

The invention discloses high-stripping hydrolysis-resistant polyurethane resin which is prepared from the following raw materials in parts by weight: 15-25 parts of polyadipic acid 1,6-hexanediol ester glycol, 20-27 parts of polytetrahydrofuran glycol PTMEG-3000, 50-70 parts of polyethylene glycol, 5.5-8.5 parts of trimethylolpropane, 10-12 parts of 4,4'-diphenylmethane diisocyanate, 5-6.5 parts of benzene dimethyl diisocyanate, 0.2-0.35 part of an organic bismuth catalyst, 3.5-4.5 parts of isophorone diamine, 2.5-3.5 parts of KH-560 and 0.5-0.8 part of an organic silicon anti-sticking agent.The high-stripping hydrolysis-resistant polyurethane resin disclosed by the invention is high in peel strength and good in hydrolysis resistance, and has high stripping and good hydrolysis resistance;the high-stripping hydrolysis-resistant polyurethane resin disclosed by the invention can be directly coated on a textile fabric or a non-woven fabric, a formed film has high stripping and good hydrolysis resistance, and a coated textile fabric or non-woven fabric finished product also has high stripping and good hydrolysis resistance.

Description

technical field [0001] The invention relates to the technical field of polyurethane and its production equipment, in particular to a high-peeling hydrolysis-resistant polyurethane resin and a preparation method thereof. Background technique [0002] The full name of polyurethane is polyurethane, a polymer compound. Polyurethane has two types: polyester type and polyether type. They can be made into polyurethane plastics (mainly foam plastics), polyurethane fibers (called spandex in China ), polyurethane rubber and elastomers. [0003] The main raw materials of polyurethane include diphenylmethane diisocyanate (MDI), toluene diisocyanate (TDI), and polypropylene glycol (PPG), all of which have become international commodities. The production technology and equipment of these raw materials are very complicated. [0004] Polyurethane resin is generally formed by the reaction of polyisocyanate and polyol containing active hydrogen atoms and groups. The reaction between the two...

AI Technical Summary

Problems solved by technology

The production technology and equipment of these raw materials are very complicated

[0004]Polyurethane resin is generally formed by the reaction of polyisocyanate and polyols containing active hydrogen atoms and groups, and the reaction between the two is a reaction between solutions. Sufficient stirring and uniformity in the reactor has a great influence on the degree of its reaction; the existing industrial reactors are generally equipped with stirring devices in actual production, but eddy currents will be generated during the stirring, so that the reactants The mixing direction is the same, resulting in insufficient mixing of the reactants and slow reaction speed; the application number is CN209680089U, which discloses a stirring reactor of polyurethane, which includes a kettle body, a feed port, a discharge port, and a supporting foot. The periphery of the kettle body is provided with an insulating jacket, and the kettle body is a cavity. The top of the kettle body is provided with a stirring mechanism, which includes a stirring motor and a stirring shaft connected to the stirring motor; The first stirring blade and the second stirring blade, the number of the first stirring blade is at least one, and the number of the second stirring blade is one. The polyurethane reaction kettle provided by the present invention has good mixing uniformity of materials, and is not easy to accumulate material at the bottom of the kettle. It has the advantages of high mixing efficiency and not easy to stick to the wall, but its stirring device has certain disadvantages. Since the stirring device rotates and stirs through the vertical direction, the liquid will follow the overall rotation of the stirring device due to the influence of gravity and inertia, resulting in a gap between the liquids. Insufficient reaction, which affects the quality of polyurethane production, there is a certain inconvenience

[0005] In the process of polyurethane production, raw materials need to be loaded. The existing publication number is CN209934543U, which discloses a feeding device for the production of water-based polyurethane paint. The device discharges the raw materials into the mixing tank through the pump to realize feeding, but this feeding device cannot adjust the height of the feeding device according to the height of different mixing tanks, and the heat resistance of polyurethane is poor. When making raw materials, the temperature of the raw materials is not cooled, because the temperature will affect the chemical properties of the raw materials, if the temperature of the raw materials is not controlled, the production quality may be affected

[0006] Publication No. CN205953901U The stirring mixer and the cyclone reactor in the polyurethane resin production device are all traditional parts, because they are divided into two processing steps, so they occupy The ground space is large, and it is difficult to improve the efficiency of mixing and reaction

[0007] Chinese Patent Invention Application No. CN201720241412.3 discloses a polyurethane heating device, including a temperature controller, an oven, a water bath, a mold temperature controller and a circulating oil circuit. The mold temperature machine is connected to the circulating oil circuit, the oven is provided with an opening, the circulating oil circuit includes a first circulating oil circuit and a second circulating oil circuit, a fan is provided at the opening, and the first circulating oil circuit There is a first solenoid valve located in front of the opening, and the second circulating oil circuit is provided with a second solenoid valve in front of the entrance of the water bath, but the temperature in this structure is difficult to control

There are the following problems in the current heating reaction device for polyurethane production: 1. The current heating reaction device for polyurethane production can only be heated in a single mode, causing the heating rate and stability to fail to meet the needs of the reaction; 2. The heat conduction efficiency of the polyurethane raw material inside the container of the heating reaction device for polyurethane production is low, and the production quality is poor due to uneven heating

But existing nitrogen filling device has the following problems: 1, when using, it is inconvenient to fix it, so that when using, because of shaking, normal use is affected; 2, when using, there is no When the amount of nitrogen in the nitrogen bottle is insufficient, the device needs to be stopped for replacement before it can continue to be used

However, the existing high-viscosity pumps have the following problems: 1. The existing high-viscosity pumps are too complicated to be disassembled as a whole, which is not convenient for transportation and quick maintenance, and reduces the overall use efficiency; 2. The existing high-viscosity pumps High-viscosity pumps have low overall corrosion resistance, wear resistance and high temperature resistance, so they are prone to damage and reduce the overall service life

[0011]1. The peel strength is low, and the bonding fastness between the polyurethane resin and the base fabric is not enough; the hydrolysis resistance is poor, and the surface is stained with alkaline substances, which easily leads to peel strength Great loss, or even no peel strength;

[0012]2. There is a lack of small and medium-sized continuous production equipment in the production of polyurethane resin, and it is impossible to properly mix, feed, prepolymerize, polymerize, and discharge Combined with storage, it is impossible to form a complete continuous polyurethane production equipment;

[0013]3. The above-mentioned defects still exist in the links of mixing, feeding, prepolymerization, polymerization, discharging and storage of polyurethane production equipment, which cannot satisfy the requirements of polyurethane The production requirements cannot guarantee the quality of the produced polyurethane

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