阅读说明：本技术 一种水性聚氨酯合成革面料及其制备方法 (Waterborne polyurethane synthetic leather fabric and preparation method thereof ) 是由 郑重 刘爱明 罗志清 梁勇劲 刘格 于 2019-11-01 设计创作，主要内容包括：本发明公开了一种水性聚氨酯合成革面料,其包括基布(1)和涂覆在该基布(2)上的水性聚氨酯贝斯涂料层(2)；所述水性聚氨酯贝斯涂料层(2)由水性聚氨酯贝斯涂料涂覆在基布层(1)上制成,其厚度为基布层(1)的2～5倍。本发明还提供其制备方法。本发明通过同步改进配方及工艺,达到简化制备工艺,并使面料显著提升贝斯层厚度其面料综合性能的目的。本发明制备的水性聚氨酯合成革面料,气泡细密均匀且大小一致,稳定性好,有良好的抗拉伸和耐磨性能,手感柔软、丰满轻盈,具有良好的透湿透气性能,且制备工艺紧凑、简洁,易于连续化生产,适合工业化大生产。(The invention discloses a waterborne polyurethane synthetic leather fabric, which comprises a base fabric (1) and a waterborne polyurethane bass coating layer (2) coated on the base fabric (2); the waterborne polyurethane base coating layer (2) is formed by coating waterborne polyurethane base coating on the base cloth layer (1), and the thickness of the waterborne polyurethane base coating layer (2) is 2-5 times that of the base cloth layer (1). The invention also provides a preparation method of the composition. According to the invention, the purposes of simplifying the preparation process and obviously improving the comprehensive performance of the fabric by the thickness of the shell fabric are achieved by synchronously improving the formula and the process. The waterborne polyurethane synthetic leather fabric prepared by the invention has the advantages of fine, uniform and uniform bubbles, good stability, good tensile resistance and wear resistance, soft, plump and light hand feeling, good moisture permeability and air permeability, compact and simple preparation process, easy continuous production and suitability for industrial mass production.)

1. The water-based polyurethane synthetic leather fabric is characterized in that: the waterproof coating comprises a base cloth (1) and a waterborne polyurethane base coating layer (2) coated on the base cloth (2); the waterborne polyurethane base coating layer (2) is formed by coating waterborne polyurethane base coating on the base cloth layer (1), and the thickness of the waterborne polyurethane base coating layer (2) is 2-5 times that of the base cloth layer (1).

2. The preparation method of the water-based polyurethane synthetic leather fabric is characterized by comprising the following steps of:

step one, preprocessing base cloth; step two, preparing aqueous polyurethane slurry; step three, preparing the waterborne polyurethane base coating; step four, preparing the water-based polyurethane synthetic leather fabric; wherein:

in the first step, 3-5 parts of acetic acid and 1-3 parts of oxalic acid are dissolved by 80-100 parts of water to prepare an acidic treatment solution, the acidic treatment solution is uniformly stirred and then is filled into a dipping tank, the base fabric is dipped into the treatment solution through the dipping tank, the dipping amount is 70% -90% of the weight of the base fabric, and then the base fabric is sequentially rolled, ironed, calendered and dried to obtain a pretreated base fabric;

in the second step, 70-90 parts of waterborne polyurethane is added into a blending kettle, 0.1-1 part of dispersing agent, 4-15 parts of polypropylene powder and 4-15 parts of talcum powder are added under the stirring condition, the mixture is stirred and dispersed for more than 30 minutes under the condition of 1000-1500 revolutions per minute, and 1-5 parts of thickening agent are added and stirred to prepare waterborne polyurethane slurry;

before coating, adding 3-10 parts of foam stabilizer into the waterborne polyurethane slurry under a stirring condition, and bubbling the waterborne polyurethane slurry by adopting compressed air, wherein the bubbling rate is 0.2-0.8 m for each hour, and stirring and foaming are carried out at 600-1000 r/min for 5-10 minutes to prepare the waterborne polyurethane synthetic leather fabric foaming slurry;

in the third step, the waterborne polyurethane slurry is coated on the pretreated base cloth by scraping, and then the waterborne polyurethane base cloth is dried to obtain a waterborne polyurethane base cloth coating layer;

and in the fourth step, carrying out surface treatment and vacuum grain absorption on the waterborne polyurethane bass coating layer to obtain the waterborne polyurethane synthetic leather fabric.

3. The method for preparing the aqueous polyurethane synthetic leather fabric according to claim 2, wherein the method comprises the following steps: in the first step, six rollers are adopted for heating and ironing, the ironing temperature is 140-160 ℃, the calendaring temperature is 140-160 ℃, and the pressure is 2-4 MPa.

4. The method for preparing the aqueous polyurethane synthetic leather fabric according to claim 2, wherein the method comprises the following steps: in the second step, the solid content of the waterborne polyurethane is not less than 60%.

5. The method for preparing the aqueous polyurethane synthetic leather fabric according to claim 2, wherein the method comprises the following steps: in the second step, the dispersing agent is sodium dodecyl sulfate or polyacrylamide surfactant, the foam stabilizer is fatty amide surfactant or sulfonate surfactant, the thickener is water-soluble associated polyurethane thickener or water-soluble cellulose thickener, the talcum powder is talcum powder with mesh number larger than 1000, and the wetting agent is anionic organosilicon wetting agent.

6. The method for preparing the aqueous polyurethane synthetic leather fabric according to claim 2, wherein the method comprises the following steps: in the third step, the blade coating amount of the waterborne polyurethane slurry is 230-480 g/m.

7. The method for preparing the aqueous polyurethane synthetic leather fabric according to claim 2, wherein the method comprises the following steps: in the fourth step, the aqueous surface treatment is to uniformly roll coat the aqueous surface treatment agent on the surface of the aqueous polyurethane bass coating, wherein the roll coat amount is 35-50 g/m, and then the aqueous surface treatment agent is dried under the condition of 80-120 ℃.

8. The method for preparing the aqueous polyurethane synthetic leather fabric according to claim 2, wherein the method comprises the following steps: in the fourth step, the water-based surface treating agent is obtained by uniformly mixing 30-50 parts of water-based polyurethane, 1-3 parts of nano silicon dioxide, 1-3 parts of sodium alginate and 50-100 parts of water.

9. The method for preparing the aqueous polyurethane synthetic leather fabric according to claim 2, wherein the method comprises the following steps: in the fourth step, the waterborne polyurethane base coating after the waterborne surface treatment is preheated for 1-2 min at the temperature of 150-180 ℃ before the vacuum line absorption.

Technical Field

The invention relates to the technical field of high molecular compounds, in particular to a water-based polyurethane synthetic leather fabric and a preparation method thereof.

Background

Polyurethanes are known under the full name of polyurethane. A polymer compound. This was produced in 1937 by o. Polyurethanes fall into the two main categories of polyester and polyether. Polyurethane is widely known for its advantages of wide adjustable range of hardness, low temperature resistance, good flexibility, etc. Therefore, the foamed materials, coatings and adhesives based on polyurethane elastomers are used more and more widely.

The development of polyurethane can be roughly divided into two stages. The first stage is mainly solvent polyurethane; the second stage is the development stage of the aqueous polyurethane. The reasons for the rapid development of aqueous polyurethanes are manifold. Firstly, organic solvents are flammable and explosive, have high volatility and high odor, and are even toxic and harmful. The waterborne polyurethane takes water as a solvent, and hardly has any pollution. From the aspects of safety and environmental protection, the rapid development of waterborne polyurethane is a necessary trend.

Base is a semi-finished product in a leather making process, and generally refers to a semi-finished product formed after base cloth is soaked in a wet method. The bass can be further made into finished products. According to different processes, suede leather such as cow leather, common synthetic leather, microfiber and the like can be made.

The waterborne polyurethane dispersion liquid for the waterborne polyurethane synthetic leather fabric has good intermiscibility and compatibility with various additives, color pastes and the like, is easy to use, the prepared slurry cannot have layering or emulsion breaking phenomenon in a storage period and has a long storage period, the existing preparation method of the waterborne polyurethane synthetic leather fabric is complex in process, and the prepared waterborne polyurethane synthetic leather fabric is poor in tensile resistance, wear resistance and stability and difficult to meet market requirements.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides the waterborne polyurethane synthetic leather fabric and the preparation method thereof, which simplify the preparation process and obviously improve the comprehensive performance of the fabric by synchronously improving the components and the process, so as to solve the problems that the existing preparation method of the waterborne polyurethane synthetic leather fabric is complex in process, and the prepared waterborne polyurethane synthetic leather fabric is poor in tensile resistance, wear resistance and stability and difficult to meet the market demand.

(II) technical scheme

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

the water-based polyurethane synthetic leather fabric is characterized in that: the coating comprises a base cloth and a water-based polyurethane bass coating layer coated on the base cloth; the waterborne polyurethane base coating layer is formed by coating waterborne polyurethane base coating on the base cloth layer, and the thickness of the waterborne polyurethane base coating layer is 2-5 times of that of the base cloth layer.

A preparation method of a water-based polyurethane synthetic leather fabric comprises the following steps:

step one, preprocessing base cloth; step two, preparing aqueous polyurethane slurry; step three, preparing the waterborne polyurethane base coating; step four, preparing the water-based polyurethane synthetic leather fabric; wherein:

in the first step, 3-5 parts of acetic acid and 1-3 parts of oxalic acid are dissolved by 80-100 parts of water to prepare an acidic treatment solution, the acidic treatment solution is uniformly stirred and then is filled into a dipping tank, the base fabric is dipped into the treatment solution through the dipping tank, the dipping amount is 70% -90% of the weight of the base fabric, and then the base fabric is sequentially rolled, ironed, calendered and dried to obtain a pretreated base fabric;

in the second step, 70-90 parts of waterborne polyurethane is added into a blending kettle, 0.1-1 part of dispersing agent, 4-15 parts of polypropylene powder and 4-15 parts of talcum powder are added under the stirring condition, the mixture is stirred and dispersed for more than 30 minutes under the condition of 1000-1500 revolutions per minute, and 1-5 parts of thickening agent are added and stirred to prepare waterborne polyurethane slurry;

before coating, adding 3-10 parts of foam stabilizer into the waterborne polyurethane slurry under a stirring condition, and bubbling the waterborne polyurethane slurry by adopting compressed air, wherein the bubbling rate is 0.2-0.8 m for each hour, and stirring and foaming are carried out at 600-1000 r/min for 5-10 minutes to prepare the waterborne polyurethane synthetic leather fabric foaming slurry;

in the third step, the waterborne polyurethane slurry is coated on the pretreated base cloth by scraping, and then the waterborne polyurethane base cloth is dried to obtain a waterborne polyurethane base cloth coating layer;

and in the fourth step, carrying out surface treatment and vacuum grain absorption on the waterborne polyurethane bass coating layer to obtain the waterborne polyurethane synthetic leather fabric.

Further, in the first step, six rollers are adopted for heating and ironing, the ironing temperature is 140-160 ℃, the calendaring temperature is 140-160 ℃, and the pressure is 2-4 MPa.

Further, in the second step, the solid content of the aqueous polyurethane is not less than 60%.

Further, in the second step, the dispersing agent is sodium dodecyl sulfate or polyacrylamide surfactant, the foam stabilizer is fatty amide surfactant or sulfonate surfactant, the thickener is water-soluble associated polyurethane thickener or water-soluble cellulose thickener, the talc powder is talc powder with the mesh number greater than 1000, and the wetting agent is anionic organosilicon wetting agent.

Further, in the third step, the blade coating amount of the aqueous polyurethane slurry is 230-480 g/m.

Further, in the fourth step, the aqueous surface treatment is to uniformly roll coat the aqueous surface treatment agent on the surface of the aqueous polyurethane bass coating, wherein the roll coat amount is 35 to 50g/m, and then the obtained product is dried under the condition of 80 to 120 ℃.

Further, in the fourth step, the aqueous surface treating agent is obtained by uniformly mixing 30-50 parts of aqueous polyurethane, 1-3 parts of nano silicon dioxide, 1-3 parts of sodium alginate and 50-100 parts of water.

Further, in the fourth step, the waterborne polyurethane base coating after the waterborne surface treatment is preheated for 1-2 min at the temperature of 150-180 ℃ before the vacuum line absorption.

(III) advantageous effects

The waterborne polyurethane synthetic leather fabric and the preparation method thereof provided by the invention have the following beneficial effects:

(1) the invention provides a water-based polyurethane synthetic leather fabric and a preparation method thereof, and aims to simplify the preparation process and obviously improve the comprehensive performance of the fabric by synchronously improving the formula and the process. The waterborne polyurethane synthetic leather fabric prepared by the invention has the advantages of fine, uniform and uniform bubbles, good stability, good tensile resistance and wear resistance, soft, plump and light hand feeling, good moisture permeability and air permeability, compact and simple preparation process, easy continuous production and suitability for industrial mass production.

(2) The method and the materials of the invention can obtain environment-friendly products because all the environment-friendly raw materials are adopted, various chemical indexes of the products can reach the standard of ecological synthetic leather, and the whole production process can not generate waste gas and waste water, thus being a clean and environment-friendly production process.

(3) The invention adopts the surface treatment and the vacuum pattern absorption post-finishing process, and the obtained water-based polyurethane synthetic leather fabric has good hand feeling and mechanical property.

Drawings

Fig. 1 is a schematic view of a layered structure of a water-based polyurethane synthetic leather fabric provided by the invention.

In the figure: 1. a base cloth; 2. and the waterborne polyurethane Bass coating layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention will be further described with reference to fig. 1 and the examples.