A sound-absorbing agent for synthetic leather and artificial leather surface and preparation method thereof

Abstract

The present invention discloses a silencing treatment agent and a preparation method for the surface of synthetic leather and artificial leather, comprising a polyester polyether copolymer resin, a microsphere intermediate, a solvent and ethyl acetate; wherein the microsphere intermediate is prepared by dispersing silicone elastic microspheres into a cellulose solution made of cellulose acetate butyrate and ethyl acetate. The silencing treatment agent of the present invention solves the problem that the surface of ordinary resin is dry and the scratch resistance and hydrolysis resistance are not enough, and has good leveling dispersion stability, excellent silencing effect (the volume of leather surface rubbing is less than 15 decibels), surface scratch resistance (the leather surface after 500 times of rubbing with a grinding wheel of the wear tester with a weight of 1kg H-188 model has no trace), and excellent rubbing performance.

Description

Technical Field

[0001] The invention belongs to the technical field of synthetic leather or artificial leather, and relates to a sound-absorbing treatment agent, in particular to a sound-absorbing treatment agent applied to the surface of synthetic leather or artificial leather and a preparation method thereof. Background Art

[0002] Synthetic leather is the term used in contrast to "leather" (i.e. genuine leather). It is also called artificial leather or synthetic leather. There is no standard term for synthetic leather in my country. Generally, it is divided into PVC artificial leather and PU synthetic leather according to the type of surface resin.

[0003] According to the resin classification, including polyvinyl chloride artificial leather

[0004] It is a plastic product made of a mixture of polyvinyl chloride resin, plasticizer and other ingredients, coated or laminated on fabric, and processed through a certain process. In addition, there is also double-sided polyvinyl chloride artificial leather with plastic layers on both sides of the substrate.

[0005] Polyamide artificial leather

[0006] It is made by coating nylon 6 or nylon 66 solution on the fabric and using the wet film-forming method to make a plastic product with a continuous cellular structure.

[0007] Polyolefin artificial leather

[0008] Polyethylene artificial leather is a kind of foam artificial leather. It is a product made of low-density polyethylene resin as the main raw material, mixed with modified resin, cross-linking agent, lubricant, foaming agent and other components.

[0009] Polyurethane artificial leather

[0010] Polyurethane artificial leather is divided into dry-process polyurethane artificial leather and wet-process polyurethane artificial leather. The so-called dry-process polyurethane artificial leather refers to a multi-layer structure composed of a multi-layer film obtained by volatilizing the solvent of a solvent-based polyurethane resin solution and a base fabric. The wet-process polyurethane artificial leather is a multi-layer structure with good air permeability and moisture permeability and a continuous porous layer obtained by using a solvent-based polyurethane resin in an underwater film-forming method.

[0011] In addition to the above four main types of artificial leather, there are also polyurethane-polyvinyl chloride composite artificial leather, rubber-plastic nylon canvas leather, etc.

[0012] In the prior art, surface treatment agents are often used to treat the surface of artificial leather (or directly scrape and apply), and then the properties of the leather surface are further treated to meet market demand. Among the existing leather surface treatment agents, the leather surface treated with the surface treatment agent has a loud friction sound when pressed; it is not scratch-resistant, and the Martindale wear resistance is 30,000 times; and it has a strong odor and is not environmentally friendly.

[0013] For example, a large amount of emulsified silicone is dispersed in ordinary polyurethane resin and then ordinary silica is added for treatment. However, this method has the following defects:

[0014] (1) If the amount of silicone oil added is too large, it is easy to cause the silicone oil to precipitate on the surface, affecting the surface gloss, oil spots and other problems. If the amount of silicone oil added is too small, the leather surface noise reduction effect cannot be achieved, and the stability of the emulsified silicone is poor.

[0015] (2) The surface of ordinary polyurethane resin is dry and has poor leveling properties, poor scratch resistance, and poor hydrolysis resistance.

[0016] (3) Ordinary silica matting powder has poor dispersibility, coarse particle size, and excessive friction, resulting in a loud rubbing sound when the leather surface is rubbed. Summary of the invention

[0017] In order to solve the above problems, the present invention provides a sound-absorbing treatment agent applied to the surface of synthetic leather and artificial leather and a preparation method thereof. The present invention adopts a polyurethane resin obtained by copolymerization of polyester and polyether to solve the problem that the surface of ordinary resin is dry and the scratch resistance and hydrolysis resistance are insufficient. The prepared sound-absorbing treatment agent applied to the surface of synthetic leather and artificial leather has good leveling, dispersibility and stability, excellent sound-absorbing effect (the rubbing volume of the leather surface is less than 15 decibels), surface scratch resistance (the leather surface has no trace after 500 frictions with a grinding wheel of model H-188 with a weight of 1 kg in a wear resistance tester), and excellent rubbing performance.

[0018] In order to achieve the above object, the present invention adopts the following technical solutions:

[0019] The present invention first provides a sound-absorbing treatment agent applied to the surface of synthetic leather and artificial leather, wherein the raw materials of the sound-absorbing treatment agent include polyester polyether copolymer resin, microsphere intermediate, solvent and ethyl acetate; wherein the microsphere intermediate is prepared by dispersing organic silicon elastic microspheres into a cellulose solution prepared by cellulose acetate butyrate and ethyl acetate.

[0020] As a preferred solution of the present invention, the polyester polyether copolymer resin has a solid content of 30% and a viscosity of 100,000 cps.

[0021] As a preferred embodiment of the present invention, the solvent is DMF; and the particle size of the microsphere intermediate is 1 μm-2 μm.

[0022] In the present invention, the cellulose acetate butyrate used in the present invention has the structural formula [C 6 H 7 O 2 (OCOCH 3 ) x (OH) 3-x ] n, (n=200-400, x=2), the silicone elastic microspheres are dispersed therein to prepare the microsphere intermediate. Compared with the currently existing method of adding a large amount of silicone oil and ordinary silicon dioxide, it has the advantages of good dispersibility and compatibility, and will not cause the problem of instability of emulsified silicone oil.

[0023] The present invention also provides a method for preparing the above-mentioned silencing treatment agent applied to the surface of synthetic leather and artificial leather, and the preparation method comprises the following steps:

[0024] 1) Preparation of cellulose solution: uniformly mixing part of the solvent and part of ethyl acetate, stirring at a first stirring speed at room temperature to obtain a mixed solvent, adding cellulose acetate butyrate to the mixed solvent, and stirring at a second stirring speed to obtain a cellulose solution;

[0025] 2) adding the organosilicon elastic microspheres and the cellulose solution obtained in step 1) into a container, and stirring at a third stirring speed at room temperature to obtain a microsphere intermediate;

[0026] 3) adding the microsphere intermediate obtained in step 2), the polyester polyether copolymer resin, the remaining solvent and the remaining ethyl acetate into a container, stirring at a second stirring speed at room temperature to obtain a sound-absorbing agent for use on the surface of synthetic leather or artificial leather.

[0027] As a preferred embodiment of the present invention, in step 1), the mass ratio of the solvent to ethyl acetate is 44:50; the mass ratio of cellulose acetate butyrate to the mixed solvent is 6:94.

[0028] As a preferred embodiment of the present invention, in step 1), the first stirring speed is 500 r / min, and the stirring time is 5 min; the second stirring speed is 1000 r / min, and the stirring time is 20 min.

[0029] As a preferred embodiment of the present invention, in step 2), the third stirring speed is 1500 / min and the stirring time is 25 min.

[0030] As a preferred embodiment of the present invention, in step 2), the mass ratio of the silicone elastic microspheres to the cellulose solution obtained in step 1) is 8:92.

[0031] As a preferred embodiment of the present invention, in step 3), the stirring time is 20 minutes.

[0032] As a preferred embodiment of the present invention, in step 3), the mass ratio of the microsphere intermediate, the polyester polyether copolymer resin, the solvent and ethyl acetate is 30:9:20:41.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1) The present invention adopts a polyester-polyether copolymerized polyurethane resin to solve the problem that the surface of ordinary resin is dry and has insufficient scratch resistance and hydrolysis resistance. The prepared silencing treatment agent for the surface of synthetic leather and artificial leather has good leveling, dispersibility and stability, excellent silencing effect (the volume of leather surface rubbing is less than 15 decibels), surface scratch resistance (the leather surface is rubbed 500 times with a grinding wheel of model H-188 with a weight of 1 kg in an abrasion tester without any trace), and excellent rubbing performance.

[0035] 2) The present invention first pre-disperses ultrafine silicone elastic microspheres in cellulose acetate butyrate to prepare a microsphere intermediate, and then adds the microsphere intermediate to the synthesized polyester polyether copolymer polyurethane resin for high-speed dispersion. No silicone oil needs to be added during the entire process, thereby solving the problems of oil spots caused by silicone oil and poor dispersion of ordinary matting powder and coarse particle size. DETAILED DESCRIPTION

[0036] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the present invention, the raw materials, reagents or equipment used can be purchased from the market.

[0038] In the present invention, the polyester polyether copolymer resin is purchased from Zhejiang Hexin New Materials Co., Ltd., model HX-9512.

[0039] Example 1

[0040] This example provides the preparation of a cellulose solution:

[0041] First, DMF and ethyl acetate are uniformly mixed in a ratio of 44:50, and mechanically stirred at room temperature at a stirring speed of 500 r / min for 5 minutes to obtain a mixed solvent. Then, cellulose acetate butyrate is added to the stirred mixed solvent in a ratio of 6:94, and the stirring speed is increased to 1000 r / min for 20 minutes. The temperature during stirring should not exceed 45°C. If the temperature is too high, the stirring speed can be reduced to 300 r / min or cooled in a water bath to obtain a cellulose solution.

[0042] Example 2

[0043] This example provides the preparation of microsphere intermediates:

[0044] Commercially available silicone elastic microspheres and the cellulose solution obtained in Example 1 were added into a container in a mass ratio of 8:92, and mechanical high-speed stirring was performed at room temperature at a stirring speed of 1500 r / min for 25 min. The stirring temperature was also controlled below 45° C. to avoid damaging the organizational structure of the cellulose solution, to obtain a microsphere intermediate.

[0045] Example 3

[0046] This embodiment provides a method for preparing a sound-absorbing agent for use on the surface of synthetic leather and artificial leather:

[0047] The synthesized polyester polyether copolymer resin with a solid content of 30% and a viscosity of 100000 cps and the microsphere intermediate obtained in Example 2, DMF, and ethyl acetate are added into a container in a mass ratio of 30:9:20:41, respectively. The mixture is stirred at room temperature at a stirring speed of 1000 r / min for 20 min to obtain a sound-absorbing agent for the surface of synthetic leather and artificial leather.

[0048] Comparative Example 1

[0049] Commercially available silicone elastic microspheres, synthesized polyester polyether copolymer resin with a solid content of 30% and a viscosity of 100,000 cps, DMF, and ethyl acetate are directly added into a container at a mass ratio of 0.7:30:20:49.3, stirred at room temperature, at a stirring speed of 1000 r / min, and for 20 min to obtain a treating agent.

[0050] The treatment agent obtained in Comparative Example 1 and the silencing treatment agent obtained in Example 3 were placed in a transparent glass container at room temperature for comparison. After 12 hours, the treatment agent prepared in Comparative Example 1 showed obvious precipitation.

[0051] The silencing treatment agent of Example 3 and the treatment agent of Comparative Example 1 were treated on the leather surface by 150 mesh double engraving printing, and then rubbed on the leather surface using a decibel tester. The value of the product treated with Example 3 was lower than 15 decibels, achieving a silent effect, while the value of the product treated with Comparative Example 1 was higher than 15 decibels, which did not achieve the expected effect.

[0052] The silencing treatment agent of Example 3 and the treatment agent of Comparative Example 1 were treated on the leather surface by 150 mesh double engraving printing, and then treated by a wear tester (500 friction times of a grinding wheel of model H-188 with a weight of 1 kg). The surface of the product treated with Example 3 had no marks, while the product treated with Comparative Example 1 had more marks.

[0053] The above is only a preferred embodiment of the present invention, and is not any formal or substantial limitation of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the method of the present invention, and these improvements and supplements should also be regarded as the protection scope of the present invention. Any technician familiar with this profession, without departing from the spirit and scope of the present invention, can make some changes, modifications and evolutions of the technical content disclosed above, which are equivalent embodiments of the present invention; at the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the essential technology of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A sound-absorbing agent for use on the surface of synthetic leather. It is characterized in that The raw materials of the noise-absorbing treatment agent include polyester polyether copolymer resin, microsphere intermediate, solvent and ethyl acetate; wherein the microsphere intermediate is prepared by dispersing silicone elastic microspheres into a cellulose solution made of cellulose acetate butyrate and ethyl acetate, wherein the mass ratio of the microsphere intermediate, polyester polyether copolymer resin, solvent and ethyl acetate is 30:9:20:

41.

2. A sound-absorbing agent for use on the surface of synthetic leather according to claim 1, It is characterized in that The polyester polyether copolymer resin has a solid content of 30% and a viscosity of 100,000 cps.

3. A sound-absorbing agent for use on the surface of synthetic leather according to claim 1, It is characterized in that The solvent is DMF; the particle size of the microsphere intermediate is 1 μm-2 μm.

4. A method for preparing a sound-absorbing agent for use on the surface of synthetic leather as claimed in any one of claims 1 to 3, It is characterized in that The preparation method comprises the following steps: 1) Preparation of cellulose solution: uniformly mixing part of the solvent and part of ethyl acetate, stirring at a first stirring speed at room temperature to obtain a mixed solvent, adding cellulose acetate butyrate to the mixed solvent, and stirring at a second stirring speed to obtain a cellulose solution; 2) adding the organosilicon elastic microspheres and the cellulose solution obtained in step 1) into a container, and stirring at a third stirring speed at room temperature to obtain a microsphere intermediate; 3) adding the microsphere intermediate obtained in step 2), the polyester polyether copolymer resin, the remaining solvent and the remaining ethyl acetate into a container, stirring at a second stirring speed at room temperature to obtain a sound-absorbing agent for use on the surface of synthetic leather.

5. The method for preparing the sound-absorbing agent for use on the surface of synthetic leather according to claim 4, It is characterized in that In step 1), the mass ratio of the solvent to ethyl acetate is 44:50; the mass ratio of cellulose acetate butyrate to the mixed solvent is 6:

94.

6. The method for preparing the sound-absorbing agent for use on the surface of synthetic leather according to claim 4, It is characterized in that In step 1), the first stirring speed is 500 r / min, and the stirring time is 5 min; the second stirring speed is 1000 r / min, and the stirring time is 20 min.

7. The method for preparing the sound-absorbing agent for use on the surface of synthetic leather according to claim 4, It is characterized in that In step 2), the third stirring speed is 1500 / min and the stirring time is 25 min.

8. The method for preparing the sound-absorbing agent for use on the surface of synthetic leather according to claim 4, It is characterized in that In step 2), the mass ratio of the silicone elastic microspheres to the cellulose solution obtained in step 1) is 8:

92.

9. The method for preparing the sound-absorbing agent for use on the surface of synthetic leather according to claim 4, It is characterized in that In step 3), the stirring time is 20 min.

10. The method for preparing the sound-absorbing agent for use on the surface of synthetic leather according to claim 4, It is characterized in that In step 3), the mass ratio of the microsphere intermediate, the polyester polyether copolymer resin, the solvent and ethyl acetate is 30:9:20:41.