阅读说明：本技术 一种阻燃型苯乙烯-丁二烯嵌段共聚物基超细纤维合成革及其生产方法 (Flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather and production method thereof ) 是由 陆毅 马兴元 严荣华 陈建邦 于 2020-12-07 设计创作，主要内容包括：本发明公开了一种阻燃型苯乙烯-丁二烯嵌段共聚物基超细纤维合成革及其生产方法,涉及超细纤维合成革技术领域。通过淋涂和挤压的方式,将溴化苯乙烯-丁二烯嵌段共聚物熔融浆料与海岛纤维非织造布基材渗入复合得到复合材料；通过蒸汽碱减量技术处理所得复合材料得到溴化苯乙烯-丁二烯嵌段共聚物/超细纤维复合材料；对溴化苯乙烯-丁二烯嵌段共聚物/超细纤维复合材料进行后整理工艺,得到绒面型苯乙烯-丁二烯嵌段共聚物基超细纤维合成革。该技术生产过程清洁环保,产品手感柔软丰满,雾化值小于4mg,气味小于3级,与SBS注塑鞋底具有很好的粘合强度,可作为鞋面材料,阻燃性能够达到美国汽车材料FMVSS302阻燃测试标准,可用作高级汽车座椅蒙皮材料。(The invention discloses flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather and a production method thereof, and relates to the technical field of superfine fiber synthetic leather. By means of curtain coating and extrusion, the brominated styrene-butadiene block copolymer molten slurry and the sea-island fiber non-woven fabric base material are infiltrated and compounded to obtain a composite material; treating the obtained composite material by a steam alkali reduction technology to obtain a brominated styrene-butadiene block copolymer/superfine fiber composite material; and (3) carrying out after-finishing process on the brominated styrene-butadiene block copolymer/superfine fiber composite material to obtain the suede type styrene-butadiene block copolymer-based superfine fiber synthetic leather. The technology has the advantages of clean and environment-friendly production process, soft and full hand feeling of the product, atomization value less than 4mg, smell less than 3 grade, good bonding strength with SBS injection molded sole, capability of being used as vamp material, capability of reaching the flame retardant test standard of American automobile material FMVSS302, and capability of being used as high-grade automobile seat skin material.)

1. A production method of flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather is characterized by comprising the following steps: firstly, adopting a curtain coating technology and an extrusion technology to curtain coat and permeate brominated styrene-butadiene block copolymer materials into the sea-island fiber non-woven fabric base material, and cooling to obtain a composite material; treating the obtained composite material by adopting a steam alkali reduction technology to obtain a brominated styrene-butadiene block copolymer/superfine fiber composite material; and carrying out after-finishing process on the obtained brominated styrene-butadiene block copolymer/superfine fiber composite material to obtain the flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather.

2. The production method of the flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather according to claim 1, wherein the brominated styrene-butadiene block copolymer material has a formula of: the adhesive comprises, by mass, 50-80 parts of brominated styrene-butadiene block copolymer, 5-10 parts of antimony oxide, 1-5 parts of toner, 0.2-1.8 parts of AC foaming agent, 5-15 parts of No. 10 white oil, 1-3 parts of titanium dioxide and 0.1-0.2 part of pentaerythritol phosphite.

3. The method for producing the flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather according to claim 1, wherein the sea-island fiber nonwoven fabric base material is a nylon 6/alkali-soluble polyester sea-island fiber nonwoven fabric or a polyester/alkali-soluble polyester sea-island fiber nonwoven fabric.

4. The production method of the flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather according to claim 1, wherein the specific operation of the curtain coating technology is as follows: extruding the brominated styrene-butadiene block copolymer through a material screw machine from a slit die head, and curtain-coating the brominated styrene-butadiene block copolymer on the sea-island fiber non-woven fabric base material;

the specific operation of the extrusion technology is realized by rolling and extruding through a rolling rod.

5. The production method of the flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather according to claim 4, wherein the temperature of the screw machine is 160-190 ℃.

6. The production method of the flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather according to claim 1, wherein the specific operation of the steam alkali deweighting technology comprises the following steps:

soaking the obtained composite material in an alkali liquor tank, extruding the composite material through a roll, then performing reduction operation through a steam oven, neutralizing the composite material through a neutralization tank after the reduction operation, washing the composite material through a washing tank after the neutralization, obtaining a composite material intermediate product after the washing is finished, and drying the composite material intermediate product through an oven to obtain the styrene-butadiene block copolymer/superfine fiber composite material.

7. The production method of the flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather according to claim 6, wherein the alkali solution tank contains 5-10% of sodium hydroxide, and the impregnation amount of the alkali solution in the alkali solution tank is 80-90% of the mass of the obtained composite material.

8. The production method of the flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather according to claim 6, wherein the temperature of the steam oven is 90-95 ℃, and the decrement time is 20-40 min.

9. The production method of the flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather according to claim 6, wherein the pH value of the obtained composite material intermediate product is 6.5-7.5.

10. The flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather prepared by the production method of any one of claims 1 to 9.

Technical Field

The invention belongs to the technical field of superfine fiber synthetic leather, and relates to flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather and a production method thereof.

Background

Because the raw leather resources for producing the natural leather are limited, and the production of the natural leather is a process with high energy consumption and high pollution, the production method can bring great pollution load to the environment. In recent years, new standards have been proposed for the safety of natural leather itself, and toxic chemicals such as Cr (vi), azo dyes, pentachlorophenol (PCP), and free formaldehyde, which are present in natural leather, are strictly limited. The production and use of natural leather face significant challenges from the standpoint of hide resources, environmental protection, product safety, and the market.

For the above reasons, development of new materials to replace natural leather is accelerated in all countries of the world. Wherein the development of the superfine fiber synthetic leather can be regarded as a model of the mutual combination of new materials. The superfine fiber synthetic leather is prepared by using superfine fiber non-woven as a base material, soaking polyurethane slurry with an open pore structure and processing through a series of complex processes. The superfine fiber has nanometer size and great specific surface area, and is similar to the fascicular collagen fiber in natural leather, and has physical performance similar to that of natural leather.

However, the continuous decline of the leather industry has been inevitable due to the shortage of raw hides and environmental pollution problems. Therefore, the development of high-performance superfine fiber synthetic leather is the research focus of research and development workers in the industry. At present, the sports shoe material is one of the largest application fields of superfine fiber synthetic leather, especially the antiskid high-grade sports shoes which are made up in recent years adopt SBS injection moulding sole, the superfine fiber synthetic leather of the existing polyurethane surface is difficult to be adhered with SBS sole, and the technical problem of bottleneck is formed.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide the flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather and the production method thereof, and solves the problem that the existing polyurethane-surfaced superfine fiber synthetic leather is difficult to be effectively bonded with the styrene-butadiene block copolymer-based material.

In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:

the invention discloses a production method of flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather, which comprises the following steps: firstly, adopting a curtain coating technology and an extrusion technology to curtain coat and permeate brominated styrene-butadiene block copolymer materials into the sea-island fiber non-woven fabric base material, and cooling to obtain a composite material; treating the obtained composite material by adopting a steam alkali reduction technology to obtain a brominated styrene-butadiene block copolymer/superfine fiber composite material; and carrying out after-finishing process on the obtained brominated styrene-butadiene block copolymer/superfine fiber composite material to obtain the flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather.

Preferably, the formulation of the brominated styrene-butadiene block copolymer material is: the adhesive comprises, by mass, 50-80 parts of brominated styrene-butadiene block copolymer, 5-10 parts of antimony oxide, 1-5 parts of toner, 0.2-1.8 parts of AC foaming agent, 5-15 parts of No. 10 white oil, 1-3 parts of titanium dioxide and 0.1-0.2 part of pentaerythritol phosphite.

Preferably, the sea-island fiber nonwoven fabric substrate is a nylon 6/alkali-soluble polyester sea-island fiber nonwoven fabric or a polyester/alkali-soluble polyester sea-island fiber nonwoven fabric.

Preferably, the curtain coating technology comprises the following specific operations: extruding the brominated styrene-butadiene block copolymer through a material screw machine from a slit die head, and curtain-coating the brominated styrene-butadiene block copolymer on the sea-island fiber non-woven fabric base material; the specific operation of the extrusion technology is realized by rolling and extruding through a rolling rod.

Further preferably, the temperature of the screw machine is 160 ℃ to 190 ℃.

Preferably, the specific operations of the steam alkali deweighting technique include: soaking the obtained composite material in an alkali liquor tank, extruding the composite material through a roll, then performing reduction operation through a steam oven, neutralizing the composite material through a neutralization tank after the reduction operation, washing the composite material through a washing tank after the neutralization, obtaining a composite material intermediate product after the washing is finished, and drying the composite material intermediate product through an oven to obtain the styrene-butadiene block copolymer/superfine fiber composite material.

Further preferably, the lye tank contains 5 to 10 percent of sodium hydroxide, and the impregnation amount of the lye in the lye tank is 80 to 90 percent of the mass of the obtained composite material.

More preferably, the neutralization tank contains 5% to 10% formic acid.

Further preferably, the temperature of the steam oven is 90-95 ℃, and the decrement time is 20-40 min.

Further preferably, the pH value of the obtained composite material intermediate product is 6.5-7.5.

The invention also discloses the flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather prepared by the production method.

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

the invention discloses a production method of flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather, which comprises the steps of adopting a flow coating and extruding mode to infiltrate and compound brominated styrene-butadiene block copolymer (brominated SBS for short) molten slurry and sea-island fiber non-woven fabric base materials to obtain a composite material; and then the flame-retardant SBS-based superfine fiber synthetic leather is obtained by a steam alkali reduction technology and an after-finishing process. The technical production process is clean and environment-friendly, and is suitable for being applied to the enlarged industrial production.

Furthermore, the screw machine and the slit die head are adopted to implement the curtain coating composite technology, so that the difficult problem of compounding the high-viscosity slurry and the fiber base material is effectively solved.

The invention also discloses the flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather prepared by the production method, and the flame-retardant SBS superfine fiber synthetic leather product is soft and full in hand feeling, has an atomization value of less than 4mg and a smell of less than 3 grades, and is a novel flexible composite material. In addition, the styrene-butadiene block copolymer component contained in the product has the same main chain structure composition with the prior styrene-butadiene block copolymer-based product and has high compatibility, thereby effectively solving the problem that the prior polyurethane-made superfine fiber synthetic leather is difficult to be effectively bonded with the styrene-butadiene block copolymer, being capable of being used as a vamp material and having good bonding strength with an SBS injection-molded sole, and being capable of producing high-performance anti-skidding sports shoes; meanwhile, the flame retardance of the flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather can reach the flame retardance test standard of American automobile material FMVSS302, and the flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather can be used as a high-grade automobile seat skin material and can also be used as an interior trim skin material of an automobile.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution 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.

It is noted that the terms first, second and the like in the description and in the claims of the present invention are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The present invention will be described in detail with reference to the following specific examples:

example 1

1) Preparation of brominated styrene-butadiene Block copolymer (SBS) materials

Weighing 50 parts of SBS, 5 parts of antimony oxide, 1 part of toner, 0.2 part of AC foaming agent, 5 parts of No. 10 white oil, 1 part of titanium dioxide and 0.1 part of pentaerythritol phosphite by mass parts, and mixing to obtain the brominated SBS material.

2) Preparation of flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather

Flow coating and compounding: controlling the temperature in a screw machine and a slit die head to be 160 ℃, extruding the brominated SBS material obtained in the step 1) from the slit die head after passing through the screw machine, coating the brominated SBS material on nylon 6/alkali-soluble polyester island fiber non-woven fabric (nylon 6(PA 6)/alkali-soluble polyester (COPET) island fiber non-woven fabric) in a spraying manner, extruding the brominated SBS material into the nylon 6/alkali-soluble polyester island fiber non-woven fabric through a pair of rollers, and cooling to obtain a composite material;

steam alkali decrement: extruding the composite material obtained in the step I through a lye tank containing 5% (w/w) of sodium hydroxide by a rolling rod, wherein the impregnation amount of lye in the lye tank is controlled to be 80% of the mass of the composite material obtained in the step I; then continuously passing through a steam oven, controlling the steam temperature at 90 ℃, reducing the steam temperature for 20min, continuously passing through a neutralization tank containing 5% (w/w) formic acid after the reduction is finished, neutralizing, then washing with water in a washing tank to obtain a composite material intermediate product, reducing the pH value of the composite material intermediate product to 6.5, and continuously passing through the oven for drying to obtain the brominated styrene-butadiene block copolymer/superfine fiber composite material (SBS/PA6 superfine fiber composite material);

thirdly, after finishing: and (4) carrying out after-finishing processes such as splitting, grinding, milling and the like on the brominated styrene-butadiene block copolymer/superfine fiber composite material (SBS/PA6 superfine fiber composite material) obtained in the step two to obtain the flame-retardant SBS-based superfine fiber synthetic leather.

The flame-retardant styrene-butadiene block copolymer (SBS) based superfine fiber synthetic leather prepared by the embodiment is soft and full in hand feeling, the atomization value of the synthetic leather is less than 4mg, the smell of the synthetic leather is less than 3 grades, the synthetic leather is a novel flexible composite material, the synthetic leather not only can be used as a vamp material and an SBS injection molded sole to be well adhered, but also can be used as a flame-retardant test standard of an American automobile material FMVSS302, and can be used as a high-grade automobile seat skin material and an interior trim skin material of an automobile.

Example 2

1) Preparation of brominated styrene-butadiene Block copolymer (SBS) materials

Weighing 56 parts of SBS, 7 parts of antimony oxide, 2.4 parts of toner, 0.48 part of AC foaming agent, 6.7 parts of No. 10 white oil, 1.4 parts of titanium dioxide and 0.12 part of pentaerythritol phosphite by mass parts, and mixing to obtain the brominated SBS material.

2) Preparation of flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather

Flow coating and compounding: controlling the temperature in a screw machine and a slit die head at 168 ℃ by adopting the screw machine, extruding the brominated SBS material obtained in the step 1) from the slit die head after passing through the screw machine, coating the brominated SBS material on polyester/alkali-soluble polyester sea-island fiber non-woven fabric (polyester (PET)/alkali-soluble polyester (COPET) sea-island fiber non-woven fabric), extruding the brominated SBS material into the polyester/alkali-soluble polyester sea-island fiber non-woven fabric through a pair of rollers, and cooling to obtain a composite material;

steam alkali decrement: extruding the composite material obtained in the step I through a lye tank containing 6.5% (w/w) of sodium hydroxide by a rolling rod, wherein the impregnation amount of lye in the lye tank is controlled to be 82% of the mass of the composite material obtained in the step I; then continuously passing through a steam oven, controlling the steam temperature at 92 ℃, reducing the steam temperature for 27min, continuously passing through a neutralization tank containing 6.5% (w/w) formic acid after the reduction is finished, washing the neutralized product by a washing tank to obtain a composite material intermediate product, reducing the pH value of the composite material intermediate product to 6.8, and continuously passing through the oven for drying to obtain the brominated styrene-butadiene block copolymer/superfine fiber composite material (SBS/PET superfine fiber composite material);

thirdly, after finishing: and (4) carrying out after-finishing processes such as splitting, grinding, milling and the like on the brominated styrene-butadiene block copolymer/superfine fiber composite material (SBS/PET superfine fiber composite material) obtained in the step two to obtain the flame-retardant SBS-based superfine fiber synthetic leather.

The flame-retardant styrene-butadiene block copolymer (SBS) based superfine fiber synthetic leather prepared by the embodiment is soft and full in hand feeling, the atomization value of the synthetic leather is less than 4mg, the smell of the synthetic leather is less than 3 grades, the synthetic leather is a novel flexible composite material, the synthetic leather not only can be used as a vamp material and an SBS injection molded sole to be well adhered, but also can be used as a flame-retardant test standard of an American automobile material FMVSS302, and can be used as a high-grade automobile seat skin material and an interior trim skin material of an automobile.

Example 3

1) Preparation of brominated styrene-butadiene Block copolymer (SBS) materials

Weighing 55 parts of SBS, 7.1 parts of antimony oxide, 2.5 parts of toner, 0.7 part of AC foaming agent, 6.7 parts of No. 10 white oil, 1.6 parts of titanium dioxide and 0.17 part of pentaerythritol phosphite by mass parts, and mixing to obtain the brominated SBS material.

2) Preparation of flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather

Flow coating and compounding: controlling the temperature in a screw machine and a slit die head to be 180 ℃, extruding the brominated SBS material obtained in the step 1) from the slit die head after passing through the screw machine, coating the brominated SBS material on the nylon 6/alkali-soluble polyester island fiber non-woven fabric in a spraying manner, extruding the brominated SBS material into the nylon 6/alkali-soluble polyester island fiber non-woven fabric through a pair of rollers, and cooling to obtain a composite material;

steam alkali decrement: extruding the composite material obtained in the step I through a rolling rod after passing through a lye tank containing 8.6% (w/w) of sodium hydroxide, wherein the impregnation amount of lye in the lye tank is controlled to be 88% of the mass of the composite material obtained in the step I; then continuously passing through a steam oven, controlling the steam temperature at 92 ℃, reducing the steam temperature for 36min, continuously passing through a neutralization tank containing 8.2% (w/w) formic acid after the reduction is finished, washing the neutralized product by a water washing tank to obtain a composite material intermediate product, reducing the pH value of the composite material intermediate product to 7.2, and continuously passing through the oven for drying to obtain the brominated styrene-butadiene block copolymer/superfine fiber composite material (SBS/PA6 superfine fiber composite material);

thirdly, after finishing: and (4) carrying out after-finishing processes such as splitting, grinding, milling and the like on the brominated styrene-butadiene block copolymer/superfine fiber composite material (SBS/PA6 superfine fiber composite material) obtained in the step two to obtain the flame-retardant SBS-based superfine fiber synthetic leather.

The flame-retardant styrene-butadiene block copolymer (SBS) based superfine fiber synthetic leather prepared by the embodiment is soft and full in hand feeling, the atomization value of the synthetic leather is less than 4mg, the smell of the synthetic leather is less than 3 grades, the synthetic leather is a novel flexible composite material, the synthetic leather not only can be used as a vamp material and an SBS injection molded sole to be well adhered, but also can be used as a flame-retardant test standard of an American automobile material FMVSS302, and can be used as a high-grade automobile seat skin material and an interior trim skin material of an automobile.

Example 4

1) Preparation of brominated styrene-butadiene Block copolymer (SBS) materials

Weighing 80 parts of SBS, 10 parts of antimony oxide, 5 parts of toner, 1.8 parts of AC foaming agent, 15 parts of No. 10 white oil, 3 parts of titanium dioxide and 0.2 part of pentaerythritol phosphite by mass parts, and mixing to obtain the brominated SBS material.

2) Preparation of flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather

Flow coating and compounding: controlling the temperature in a screw machine and a slit die head to be 190 ℃, extruding the brominated SBS material obtained in the step 1) from the slit die head after passing through the screw machine, coating the brominated SBS material on polyester/alkali-soluble polyester island fiber non-woven fabric in a spraying manner, extruding the brominated SBS material into the polyester/alkali-soluble polyester island fiber non-woven fabric through a pair of rollers, and cooling to obtain a composite material;

steam alkali decrement: extruding the composite material obtained in the step I through a lye tank containing 10% (w/w) of sodium hydroxide by a rolling rod, wherein the impregnation amount of lye in the lye tank is controlled to be 90% of the mass of the composite material obtained in the step I; then continuously passing through a steam oven, controlling the steam temperature to be between 95 ℃, reducing for 40min, continuously passing through a neutralization tank containing 10% (w/w) formic acid after the reduction is finished, washing with water in a washing tank after the neutralization to obtain a composite material intermediate product, reducing the pH value of the composite material intermediate product to 7.5, and continuously passing through the oven for drying to obtain the brominated styrene-butadiene block copolymer/superfine fiber composite material (SBS/PET superfine fiber composite material);

thirdly, after finishing: and (4) carrying out after-finishing processes such as splitting, grinding, milling and the like on the brominated styrene-butadiene block copolymer/superfine fiber composite material (SBS/PET superfine fiber composite material) obtained in the step two to obtain the flame-retardant SBS-based superfine fiber synthetic leather.

The flame-retardant styrene-butadiene block copolymer (SBS) based superfine fiber synthetic leather prepared by the embodiment is soft and full in hand feeling, the atomization value of the synthetic leather is less than 4mg, the smell of the synthetic leather is less than 3 grades, the synthetic leather is a novel flexible composite material, the synthetic leather not only can be used as a vamp material and an SBS injection molded sole to be well adhered, but also can be used as a flame-retardant test standard of an American automobile material FMVSS302, and can be used as a high-grade automobile seat skin material and an interior trim skin material of an automobile.

Example 5

1) Preparation of brominated styrene-butadiene Block copolymer (SBS) materials

Weighing 60 parts of SBS, 7 parts of antimony oxide, 2.5 parts of toner, 1.1 parts of AC foaming agent, 10 parts of No. 10 white oil, 2 parts of titanium dioxide and 0.15 part of pentaerythritol phosphite by mass parts, and mixing to obtain the brominated SBS material.

2) Preparation of flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather

Flow coating and compounding: controlling the temperature in a screw machine and a slit die head to 170 ℃, extruding the brominated SBS material obtained in the step 1) from the slit die head after passing through the screw machine, coating the brominated SBS material on the nylon 6/alkali-soluble polyester island fiber non-woven fabric in a spraying manner, extruding the brominated SBS material into the nylon 6/alkali-soluble polyester island fiber non-woven fabric through a pair of rollers, and cooling to obtain a composite material;

steam alkali decrement: extruding the composite material obtained in the step I through a lye tank containing 7% (w/w) of sodium hydroxide by a rolling rod, wherein the impregnation amount of lye in the lye tank is controlled to be 82% of the mass of the composite material obtained in the step I; then continuously passing through a steam oven, controlling the steam temperature at 91 ℃, reducing the steam for 35min, continuously passing through a neutralization tank containing 7% (w/w) formic acid after the reduction is finished, neutralizing, then washing with water in a washing tank to obtain a composite material intermediate product, reducing the pH value of the composite material intermediate product to 7, and continuously passing through the oven for drying to obtain the brominated styrene-butadiene block copolymer/superfine fiber composite material (SBS/PA6 superfine fiber composite material);

thirdly, after finishing: and (4) carrying out after-finishing processes such as splitting, grinding, milling and the like on the brominated styrene-butadiene block copolymer/superfine fiber composite material (SBS/PA6 superfine fiber composite material) obtained in the step two to obtain the flame-retardant SBS-based superfine fiber synthetic leather.

The flame-retardant styrene-butadiene block copolymer (SBS) based superfine fiber synthetic leather prepared by the embodiment is soft and full in hand feeling, the atomization value of the synthetic leather is less than 4mg, the smell of the synthetic leather is less than 3 grades, the synthetic leather is a novel flexible composite material, the synthetic leather not only can be used as a vamp material and an SBS injection molded sole to be well adhered, but also can be used as a flame-retardant test standard of an American automobile material FMVSS302, and can be used as a high-grade automobile seat skin material and an interior trim skin material of an automobile.

Example 6

1) Preparation of brominated styrene-butadiene Block copolymer (SBS) materials

Weighing 72 parts of SBS, 7.6 parts of antimony oxide, 3.3 parts of toner, 1.6 parts of AC foaming agent, 12 parts of No. 10 white oil, 2 parts of titanium dioxide and 0.18 part of pentaerythritol phosphite by mass parts, and mixing to obtain the brominated SBS material.

2) Preparation of flame-retardant styrene-butadiene block copolymer-based superfine fiber synthetic leather

Flow coating and compounding: controlling the temperature in a screw machine and a slit die head to be 165 ℃ by adopting the screw machine, extruding the brominated SBS material obtained in the step 1) from the slit die head after passing through the screw machine, spraying the brominated SBS material on the polyester/alkali-soluble polyester island fiber non-woven fabric, extruding the brominated SBS material into the polyester/alkali-soluble polyester island fiber non-woven fabric through a pair of rollers, and cooling to obtain a composite material;

steam alkali decrement: extruding the composite material obtained in the step I through a lye tank containing 8% (w/w) of sodium hydroxide by a rolling rod, wherein the impregnation amount of lye in the lye tank is controlled to be 83% of the mass of the composite material obtained in the step I; then continuously passing through a steam oven, controlling the steam temperature at 93 ℃, reducing the steam temperature for 28min, continuously passing through a neutralization tank containing 6% (w/w) formic acid after the reduction is finished, neutralizing, then washing with water in a washing tank to obtain a composite material intermediate product, reducing the pH value of the composite material intermediate product to 7.1, and continuously passing through the oven for drying to obtain the brominated styrene-butadiene block copolymer/superfine fiber composite material (SBS/PET superfine fiber composite material);

thirdly, after finishing: and (4) carrying out after-finishing processes such as splitting, grinding, milling and the like on the brominated styrene-butadiene block copolymer/superfine fiber composite material (SBS/PET superfine fiber composite material) obtained in the step two to obtain the flame-retardant SBS-based superfine fiber synthetic leather.

The flame-retardant styrene-butadiene block copolymer (SBS) based superfine fiber synthetic leather prepared by the embodiment is soft and full in hand feeling, the atomization value of the synthetic leather is less than 4mg, the smell of the synthetic leather is less than 3 grades, the synthetic leather is a novel flexible composite material, the synthetic leather not only can be used as a vamp material and an SBS injection molded sole to be well adhered, but also can be used as a flame-retardant test standard of an American automobile material FMVSS302, and can be used as a high-grade automobile seat skin material and an interior trim skin material of an automobile.

In conclusion, the invention relates to the technical field of superfine fiber synthetic leather, and particularly relates to flame-retardant SBS (styrene butadiene styrene) based superfine fiber synthetic leather and a production method thereof. The invention takes nylon 6(PA 6)/alkali soluble polyester (COPET) sea-island fiber non-woven fabric or polyester/alkali soluble polyester sea-island fiber non-woven fabric as the sea-island fiber non-woven fabric base material, and adopts the modes of curtain coating and extrusion to compound the brominated styrene-butadiene block copolymer (brominated SBS for short) molten slurry and the base material to obtain the brominated SBS/sea-island fiber non-woven fabric fine composite material. And then the flame-retardant SBS-based superfine fiber synthetic leather is obtained by a steam alkali reduction technology and an after-finishing process. The flame-retardant SBS-based superfine fiber synthetic leather product prepared by the invention is soft and full in hand feeling, the atomization value is less than 4mg, the smell is less than 3 grades, the flame-retardant SBS-based superfine fiber synthetic leather product can be used as a vamp material, has good bonding strength with an SBS injection molded sole, can be used for producing high-performance antiskid sneakers, has flame retardance reaching the flame-retardant test standard of American automobile material FMVSS302, and can be used as a high-grade automobile seat skin material and an interior trim skin material of an automobile.

The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.