阅读说明：本技术 一种pvc人造革用耐刮擦表面涂饰剂 (Scratch-resistant surface coating agent for PVC artificial leather ) 是由 梅子能 关仲翔 姚文佩 于 2021-07-22 设计创作，主要内容包括：本发明公开了一种PVC人造革用耐刮擦表面涂饰剂,所述涂饰剂以重量份计,包括如下组分：多异氰酸酯15-45重量份、含活泼氢的化合物与树脂5-20重量份、去离子水10-30重量份、催化剂5-15重量份和助剂5-15重量份。该PVC人造革用耐刮擦表面涂饰剂以多异氰酸酯和含活泼氢的化合物与树脂为主要原料,合成PVC人造革用耐刮擦表面涂饰剂,采用了适当的聚酯多元醇、催化剂、助剂可以提高聚氨酯面料树脂的耐磨耗耐刮擦性能。(The invention discloses a scratch-resistant surface finishing agent for PVC artificial leather, which comprises the following components in parts by weight: 15-45 parts of polyisocyanate, 5-20 parts of compound containing active hydrogen and resin, 10-30 parts of deionized water, 5-15 parts of catalyst and 5-15 parts of auxiliary agent. The scratch-resistant surface finishing agent for the PVC artificial leather is synthesized by taking polyisocyanate, a compound containing active hydrogen and resin as main raw materials, and the wear resistance and scratch resistance of polyurethane fabric resin can be improved by adopting proper polyester polyol, a catalyst and an auxiliary agent.)

1. The scratch-resistant surface finishing agent for the PVC artificial leather is characterized by comprising the following components in parts by weight: 15-45 parts of polyisocyanate, 5-20 parts of compound containing active hydrogen and resin, 10-30 parts of deionized water, 5-15 parts of catalyst and 5-15 parts of auxiliary agent.

2. The scratch-resistant surface finishing agent for PVC artificial leather according to claim 1, characterized in that: the polyisocyanate is one or a mixture of more than one of aromatic diisocyanate and aliphatic diisocyanate, the aromatic diisocyanate comprises toluene diisocyanate and 4, 4-diphenylmethane diisocyanate, and the aliphatic diisocyanate comprises hexamethylene diisocyanate, isophorone diisocyanate and tetramethylxylene diisocyanate.

3. The scratch-resistant surface finishing agent for PVC artificial leather according to claim 1, characterized in that: the compound containing active hydrogen and the resin are one or more of a mixture of polyol and polyhydroxy resin, the polyol comprises polyester polyol, polyether polyol, alkyd resin and acrylic resin polyol, and the polyhydroxy resin comprises castor oil and alcoholysis products thereof, alkyd resin, polyester resin, polyether resin, hydroxy acrylic resin and epoxy resin.

4. The scratch-resistant surface finishing agent for PVC artificial leather according to claim 1, characterized in that: the catalyst comprises a resin synthesis catalyst and a paint film curing catalyst.

5. The scratch-resistant surface finishing agent for PVC artificial leather according to claim 1, characterized in that: the auxiliary agent comprises a water removing agent, a color reducing agent, a flatting agent, a defoaming agent and a delustering agent.

6. The scratch-resistant surface coating agent for PVC artificial leather according to claim 1, wherein the preparation method of the scratch-resistant surface coating agent for PVC artificial leather comprises the steps of:

(1) pre-polymerization: at normal temperature and normal pressure, pumping polyisocyanate, a compound containing active hydrogen and resin into a polyurethane resin reaction kettle according to a process ratio, and starting a stirring device to stir materials;

(2) refluxing: adding an auxiliary agent and a catalyst into the prepolymer, and carrying out reflux reaction for 3-5 hours at the temperature of 60 ℃;

(3) and (3) neutralization reaction: when the content of the isocyanic acid radical reaches a specified value, cooling to below 50 ℃, transferring into a high-speed dispersion machine, and adding triethylamine at a medium speed for neutralization;

(4) dispersing, emulsifying and chain extending: adding deionized water at a high speed for emulsification, dispersing the prepolymer in water under the action of shearing force, wherein the dispersing process needs to be carried out at a low temperature to reduce the reaction activity of-NCO and water, the water participating in the reaction is used as a chain extender, and then ethylenediamine and dimethylolbutyric acid with high reaction activity are used for chain extension in water to rapidly promote the chain growth reaction to generate the waterborne polyurethane with high molecular weight;

(5) packaging a finished product: when the polymer reaches a certain viscosity, cooling the materials to 40 ℃ by introducing cooling water into the jacket, opening a nitrogen control valve to introduce nitrogen into the kettle, opening a kettle bottom valve, filtering the materials, and discharging.

7. The scratch-resistant surface finishing agent for PVC artificial leather according to claim 4, characterized in that: the rotating speed of the stirring in the step (1) is 500-800r/min, and the stirring time is 25-30 min.

8. The scratch-resistant surface finishing agent for PVC artificial leather according to claim 4, characterized in that: and (5) filtering by using a filter bag with 100 meshes and 200 meshes.

Technical Field

The invention relates to the technical field of coatings, in particular to a scratch-resistant surface finishing agent for PVC artificial leather.

Background

Artificial leather is a plastic product that looks and feels like leather and can replace it. Usually, the fabric is used as a substrate and coated with synthetic resin and various plastic additives. Mainly comprises PVC artificial leather and PU synthetic leather. The leather finishing agent is a general name of leather auxiliary agents for leather surface finishing protection and leather beautification, and is prepared by a film forming substance, a coloring material, a solvent and the auxiliary agents according to a certain proportion, wherein the film forming substance is the basis of the leather finishing agent. The leather finishing agent also has very important function in the leather manufacturing industry, can improve the leather beauty, prolong the leather using time, obviously improve the quality and grade of leather products and increase the trade value.

However, the existing artificial leather is easy to have creases, and burrs or scratches are easy to appear after the surface of the artificial leather is scraped, so that the integral aesthetic degree is influenced. Therefore, there is a need for a scratch-resistant crease-resistant finishing agent for PVC artificial leather.

Disclosure of Invention

The invention aims to provide a scratch-resistant surface coating agent for PVC artificial leather, aiming at overcoming the defects of the prior art, and solving the problems that the prior artificial leather is easy to have creases and burrs or scratches are easy to appear after the surface of the artificial leather is scratched, and the integral attractiveness is affected.

In order to achieve the purpose, the invention provides the following technical scheme: the scratch-resistant surface finishing agent for the PVC artificial leather comprises the following components in parts by weight: 15-45 parts of polyisocyanate, 5-20 parts of compound containing active hydrogen and resin, 10-30 parts of deionized water, 5-15 parts of catalyst and 5-15 parts of auxiliary agent.

Further, the polyisocyanate is one or more of a mixture of aromatic diisocyanate and aliphatic diisocyanate, the aromatic diisocyanate comprises toluene diisocyanate and 4, 4-diphenylmethane diisocyanate, and the aliphatic diisocyanate comprises hexamethylene diisocyanate, isophorone diisocyanate and tetramethylxylylene diisocyanate.

Further, the compound and the resin containing active hydrogen are one or a mixture of more than one of polyol and polyhydroxy resin, the polyol comprises polyester polyol, polyether polyol, alkyd resin and acrylic resin polyol, and the polyhydroxy resin comprises castor oil and alcoholysis products thereof, alkyd resin, polyester resin, polyether resin, hydroxy acrylic resin and epoxy resin.

Further, the catalyst includes a resin synthesis catalyst and a paint film curing catalyst.

Furthermore, the auxiliary agent comprises a water removing agent, a color reducing agent, a flatting agent, a defoaming agent and a delustering agent.

Further, the preparation method of the scratch-resistant surface finishing agent for PVC artificial leather comprises the following steps:

(1) pre-polymerization: at normal temperature and normal pressure, pumping polyisocyanate, a compound containing active hydrogen and resin into a polyurethane resin reaction kettle according to a process ratio, and starting a stirring device to stir materials;

(2) refluxing: adding an auxiliary agent and a catalyst into the prepolymer, and carrying out reflux reaction for 3-5 hours at the temperature of 60 ℃;

(3) and (3) neutralization reaction: when the content of the isocyanic acid radical reaches a specified value, cooling to below 50 ℃, transferring into a high-speed dispersion machine, and adding triethylamine at a medium speed for neutralization;

(4) dispersing, emulsifying and chain extending: adding deionized water at a high speed for emulsification, dispersing the prepolymer in water under the action of shearing force, wherein the dispersing process needs to be carried out at a low temperature to reduce the reaction activity of-NCO and water, the water participating in the reaction is used as a chain extender, and then ethylenediamine and dimethylolbutyric acid with high reaction activity are used for chain extension in water to rapidly promote the chain growth reaction to generate the waterborne polyurethane with high molecular weight;

(5) packaging a finished product: when the polymer reaches a certain viscosity, cooling the materials to 40 ℃ by introducing cooling water into the jacket, opening a nitrogen control valve to introduce nitrogen into the kettle, opening a kettle bottom valve, filtering the materials, and discharging.

Further, the rotation speed of the stirring in the step (1) is 500-.

Further, the filtration in the step (5) is performed by using a 100-200-mesh filter bag.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention takes polyisocyanate, compound containing active hydrogen and resin as main raw materials to synthesize the scratch-resistant surface finishing agent for PVC artificial leather, and adopts proper polyester polyol, catalyst and auxiliary agent to improve the wear resistance and scratch resistance of polyurethane fabric resin;

2. the polyurethane prepared by the invention is a novel polyurethane system which takes water as a dispersing medium instead of an organic solvent, takes water as a solvent, has no pollution, is safe and reliable, has excellent mechanical property and good compatibility, and is easy to modify; when the coating is used for coating leather, the leveling property is good, the film forming property is good, the covering power is strong, the bonding is firm, and the coated leather has the advantages of folding resistance and scraping resistance.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows: in this example, the scratch-resistant surface finishing agent for PVC artificial leather was prepared from the following raw materials in parts by weight:

wherein, the polyisocyanate is toluene diisocyanate, and the compound containing active hydrogen and the resin are polyester polyol.

The preparation method comprises the following steps:

(1) pre-polymerization: at normal temperature and normal pressure, pumping polyisocyanate, a compound containing active hydrogen and resin into a polyurethane resin reaction kettle according to a process ratio, and starting a stirring device to stir materials;

(2) refluxing: adding an auxiliary agent and a catalyst into the prepolymer, and carrying out reflux reaction for 3-5 hours at the temperature of 60 ℃;

(3) and (3) neutralization reaction: when the content of the isocyanic acid radical reaches a specified value, cooling to below 50 ℃, transferring into a high-speed dispersion machine, and adding triethylamine at a medium speed for neutralization;

(4) dispersing, emulsifying and chain extending: adding deionized water at a high speed for emulsification, dispersing the prepolymer in water under the action of shearing force, wherein the dispersing process needs to be carried out at a low temperature to reduce the reaction activity of-NCO and water, the water participating in the reaction is used as a chain extender, and then ethylenediamine and dimethylolbutyric acid with high reaction activity are used for chain extension in water to rapidly promote the chain growth reaction to generate the waterborne polyurethane with high molecular weight;

(5) packaging a finished product: when the polymer reaches a certain viscosity, cooling the materials to 40 ℃ by introducing cooling water into the jacket, opening a nitrogen control valve to introduce nitrogen into the kettle, opening a kettle bottom valve, filtering the materials, and discharging.

Example two: in this example, the scratch-resistant surface finishing agent for PVC artificial leather was prepared from the following raw materials in parts by weight:

wherein the polyisocyanate is a mixture of 4, 4-diphenylmethane diisocyanate and hexamethylene diisocyanate, and the active hydrogen-containing compound and resin are a mixture of polyether polyol and epoxy resin. The preparation method is the same as the steps of the embodiment.

Example three: in this example, the scratch-resistant surface finishing agent for PVC artificial leather was prepared from the following raw materials in parts by weight:

wherein, the polyisocyanate is hexamethylene diisocyanate, and the compound containing active hydrogen and the resin are epoxy resin. The preparation method is the same as the steps of the embodiment.

Example four: in this example, the scratch-resistant surface finishing agent for PVC artificial leather was prepared from the following raw materials in parts by weight:

wherein, the polyisocyanate is selected from the mixture of toluene diisocyanate and 4, 4-diphenylmethane diisocyanate and hexamethylene diisocyanate, and the compound and resin containing active hydrogen are selected from the mixture of alkyd resin, acrylic resin polyol and polyester resin. The preparation method is the same as the steps of the embodiment.

Example five: in this example, the scratch-resistant surface finishing agent for PVC artificial leather was prepared from the following raw materials in parts by weight:

wherein, the polyisocyanate is selected from the mixture of toluene diisocyanate and 4, 4-diphenylmethane diisocyanate, and the compound containing active hydrogen and the resin are selected from the mixture of polyether glycol and epoxy resin. The preparation method is the same as the steps of the embodiment.

Comparative example one: the feed is prepared from the following raw materials in parts by weight:

wherein, the polyisocyanate is selected from tetramethylxylylene diisocyanate, the compound containing active hydrogen and the resin are selected from epoxy resin, and the preparation method is the same as the steps of the embodiment.

In addition, the testing method of the scratch-resistant surface finishing agent for PVC artificial leather comprises the following steps:

and (3) measuring the crease: the coating agents of the examples were each scraped off the wood board with a film scraper to a film thickness of 20 μm, the wet film was cured by a high-pressure mercury lamp, and after curing, the cured film was refrigerated in a low-temperature cabinet and folded, and the number of folds corresponding to the occurrence of unrecoverable creases was recorded.

Determination of scratch resistance: the coating agents in examples were each scraped off a wood board with a film scraper to a film thickness of 20 μm, the wet film was cured by a high-pressure mercury lamp, and the surface of the cured film was rubbed with sandpaper to observe the amount of burrs on the surface.

The test results are shown in the following table:

detecting items

Example one

Example two

EXAMPLE III

Example four

EXAMPLE five

Comparative example 1

Low temperature crease mark (times)

80

120

50

60

40

20

Amount of burr

Chinese character shao (a Chinese character of 'shao')

Chinese character shao (a Chinese character of 'shao')

Chinese character shao (a Chinese character of 'shao')

Chinese character shao (a Chinese character of 'shao')

Chinese character shao (a Chinese character of 'shao')

Chinese character shao (a Chinese character of 'shao')

As can be seen from the table, the scratch resistant surface finishing agent for PVC artificial leather (examples 1-5) prepared by the present invention can obtain a finishing agent which can be pulled and folded 40 times at a low temperature without crease, is abrasion resistant and has less burr after abrasion, by curing directly. Therefore, the artificial leather has the advantages of folding resistance and scraping resistance, and the problems that the conventional artificial leather is easy to have creases, and burrs or scratches are easy to appear after the surface of the artificial leather is scraped once, so that the overall attractiveness is affected are solved.

The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.