阅读说明：本技术 仿真皮超纤革的制备方法、仿真皮超纤革及仿真皮产品 (Preparation method of imitated leather microfiber leather, imitated leather microfiber leather and imitated leather product ) 是由 王乐智 冯国飞 马金美 王霏霏 徐涛 于 2019-11-06 设计创作，主要内容包括：本发明公开了仿真皮超纤革的制备方法、仿真皮超纤革及仿真皮产品,涉及皮革技术领域。仿真皮超纤革的制备方法包括：在底胚上形成粘结涂层,然后在粘结涂层上涂覆发泡树脂浆料,经高温发泡后进行表面打磨。仿真皮超纤革由上述仿真皮超纤革的制备方法制备而得,具有细腻毛感的效果,接近真皮毛感,利用该仿真皮超纤革制备得到的仿真皮产品具有很好的市场推广价值。(The invention discloses a preparation method of artificial leather microfiber leather, artificial leather microfiber leather and an artificial leather product, and relates to the technical field of leather. The preparation method of the imitated leather microfiber leather comprises the following steps: forming a bonding coating on the base blank, then coating foaming resin slurry on the bonding coating, foaming at high temperature and then polishing the surface. The imitated leather microfiber leather is prepared by the preparation method of the imitated leather microfiber leather, has the effect of fine hair feeling, is close to real leather hair feeling, and has good market popularization value.)

1. A preparation method of the artificial leather microfiber leather is characterized by comprising the following steps:

forming a bonding coating on the base blank, then coating foaming resin slurry on the bonding coating, foaming at high temperature and then polishing the surface.

2. The method for preparing the artificial leather with microfiber according to claim 1, wherein the high temperature foaming process is performed at 165-185 ℃ for 2-4 min;

preferably, the high-temperature foaming process is carried out for 2-3min at the temperature of 170-185 ℃;

preferably, the base blank is a dummy-head-layer microfiber base blank.

3. The method for preparing the artificial leather with the microfiber according to claim 2, wherein the foamed resin slurry is polyurethane foamed resin slurry;

preferably, the polyurethane foaming resin slurry comprises Yangbuck resin and crude Yangbuck powder, and the mass ratio of the Yangbuck resin to the crude Yangbuck powder is 100: 2-8; preferably 100: 3-5;

preferably, the viscosity of the polyurethane foaming resin slurry is 1200-1600 cps;

preferably, the viscosity of the polyurethane foaming resin slurry is adjusted by using an organic solvent; more preferably, the organic solvent is selected from any one of butanone, methyl acetate and toluene; butanone is more preferable.

4. The preparation method of the imitated dermal microfiber leather according to claim 3, wherein the polyurethane foaming resin slurry is coated in a roll coating manner;

preferably, the sizing amount of the roller coating process is 200-240g/m, preferably 210-230 g/m;

preferably, the speed of the roller coating process is 10-18m/min, preferably 14-16 m/min;

preferably, the drying temperature after the completion of the roll coating is 70 to 130 ℃, preferably 90 to 110 ℃.

5. The method for preparing the imitated dermal microfiber leather according to claim 3, wherein ironing is performed to form a flat coating layer before the polyurethane foaming resin slurry is applied after the adhesive coating layer is applied;

preferably, the ironing temperature is 80-100 ℃, the calender speed is 2-4m/min, and the pressure is 3-5 kg.

6. The method for preparing the artificial leather with the microfiber according to claim 1, wherein the raw material for coating the bonding coating is aqueous polyurethane resin;

preferably, the aqueous polyurethane resin is of a hot-melt type;

preferably, the solid content of the waterborne polyurethane resin is more than or equal to 25 percent, and more preferably, the solid content is 27-30 percent.

7. The method for preparing the artificial leather with the microfiber according to claim 6, wherein the bonding coating is applied by direct coating;

preferably, the coating gap is 0.1-0.2mm, the sizing amount is 190g/m, the speed of the direct coating machine is 7-9m/min, and the drying temperature after coating is 70-90 ℃.

8. The method for preparing the artificial leather with the microfiber according to claim 1, wherein the surface polishing process is performed by using a sanding machine;

preferably, the thickness is reduced by 0.1-0.15mm before and after sanding in the sanding process;

preferably, the sanding process adopts 100-140-mesh sand paper, the rotating speed is 900-1200r/min, and the speed of the sanding machine is 4-6 m/min.

9. The artificial leather microfiber leather is characterized by being prepared by the method for preparing the artificial leather microfiber leather according to any one of claims 1 to 8.

10. A simulated leather product prepared by applying the simulated dermal microfiber leather of claim 9;

preferably, the imitation leather product is a shoe or a case.

Technical Field

The invention relates to the technical field of leather, in particular to a preparation method of imitated leather microfiber leather, imitated leather microfiber leather and an imitated leather product.

Background

The artificial leather is a plastic product similar to leather, is similar to natural leather, and has the characteristics of softness, wear resistance and the like. Depending on the type of the cover, there are polyvinyl chloride artificial leather (PVC), polyurethane artificial leather (PU), and the like. Artificial leather is classified into general artificial leather and foamed artificial leather according to whether the covering layer is foamed or not.

The existing foamed artificial leather has the following disadvantages: (1) the simulation effect is not good, and the effect of real leather hair feeling cannot be achieved; (2) poor air permeability and less foaming.

Disclosure of Invention

The invention aims to provide a preparation method of imitated leather microfiber leather, which aims to enable foaming to be larger, and a material obtained after treatment has better hair feeling, and has good air permeability and bonding strength.

The invention also aims to provide the artificial leather with the microfiber, which has a real leather hair feeling and can achieve a fine hair feeling of a ground real leather.

The third purpose of the invention is to provide a simulated leather product which has a hand feeling close to the real leather effect and has good market application value.

The technical problem to be solved by the invention is realized by adopting the following technical scheme.

The invention provides a preparation method of artificial leather microfiber leather, which comprises the following steps:

forming a bonding coating on the base blank, then coating foaming resin slurry on the bonding coating, foaming at high temperature and then polishing the surface.

The invention also provides the artificial leather microfiber leather which is prepared by applying the preparation method of the artificial leather microfiber leather.

The invention also provides a simulated leather product which is prepared by applying the simulated leather microfiber leather; preferably, the imitation leather product is a shoe or a case.

The embodiment of the invention provides a preparation method of artificial leather microfiber leather, which has the beneficial effects that: the bonding coat is coated on the base blank to play a role in improving the bonding fastness of the base blank and the surface layer resin, then the foaming resin slurry is coated to form an even foam layer after high-temperature foaming, and fine hair feeling can be formed by damaging the foam layer in the polishing process and is close to real leather hair feeling. The function of the bonding coat is to improve the bonding fastness on one hand, and on the other hand, the bonding coat is directly coated on the base blank, so that the ventilation effect is better, the foaming is larger, and the formed fluffy feeling is better.

The invention also provides the artificial leather microfiber leather and an artificial leather product, the artificial leather microfiber leather is prepared by the preparation method of the artificial leather microfiber leather, has the effect of fine hair feeling, is close to the hair feeling of real leather, and the artificial leather product prepared by the artificial leather microfiber leather has good market popularization value.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

The preparation method of the artificial leather microfiber leather, the artificial leather microfiber leather and the artificial leather product provided by the embodiment of the invention are specifically described below.

The preparation method of the artificial leather microfiber leather provided by the embodiment of the invention comprises the following steps:

s1, coating and forming of adhesive coating

And a bonding coating is coated on the bottom blank, and the bonding coating mainly plays a role in improving bonding fastness. In the prior art, the adhesive coating is coated on another paper, and then the paper is connected with a base blank, so that the air permeability is poor. The inventor finds that the foaming effect can be further improved by directly coating the bonding coating on the base blank, the foaming is larger, and the finally formed fluffy feeling is better.

Preferably, the base blank is a dummy layer microfiber base blank, and the microfiber base blank can be a commercially available material or a material produced by the factory. The microfiber blank is used as an excellent raw material of synthetic leather, and is favorable for further processing to form the imitated leather microfiber leather with better fur feeling. In other embodiments, other blanks besides microfiber blanks may be used, such as stretch cloth, space leather, and imitation super base cloth.

Specifically, the coating raw material of the bonding coating is water-based polyurethane resin; preferably, the aqueous polyurethane resin is of a hot melt type. The waterborne polyurethane resin can have a good bonding effect on the foaming layer, and the raw materials are easy to obtain. The waterborne polyurethane resin adopted in the embodiment of the invention is waterborne aliphatic high-solid-content hot-melt resin PUD-066 produced by Shijiazhu Xin chemical technology limited. The solid content of the waterborne polyurethane resin is more than or equal to 25, more preferably 27-30, and the high solid content is used for increasing the surface density of the base fabric.

Furthermore, the coating mode of the bonding coating is carried out in a direct coating mode, namely a direct coating machine is adopted for coating, the direct coating mode is simple, convenient and easy to implement, and a smooth coating is easy to form, so that the foaming uniformity of the subsequent foaming process is facilitated. Preferably, the coating gap is 0.1-0.2mm, the sizing amount is 190g/m, the speed of the direct coating machine is 7-9m/min, and the drying temperature after coating is 70-90 ℃. The inventor optimizes specific process parameters of the direct coating process, and the process parameters are preferably controlled within the range in the coating process, so that the uniform and flat coating can be formed, and the uniformity of the subsequent foaming process can be facilitated.

In order to further improve the flatness of the bond coat, ironing is performed after the bond coat is applied and before the polyurethane foaming resin is applied. Preferably, the ironing temperature is 80-100 ℃, the calender speed is 3-4m/min, and the pressure is 3-5 kg. The bonding coating is more positive through the ironing process, and the uniformity of subsequent foaming is further improved. The technological parameters of the ironing process are optimized according to the material of the bonding coating, and the technological efficiency is improved as much as possible while the bonding performance is not damaged.

S2, coating and foaming of polyurethane foaming resin

And (3) coating foaming resin and foaming at high temperature, wherein the foaming resin can be common polyurethane foaming resin, the foaming effect is better, and the fineness of the hair feeling after polishing is high.

The polyurethane foaming resin may be a commercially available material, but since long-term storage may affect the foaming effect to some extent, it is preferable to use a method which is currently used. Preferably, the polyurethane foaming resin slurry comprises Yangbuck resin and crude Yangbuck powder, and the mass ratio of the Yangbuck resin to the crude Yangbuck powder is 100: 2-8; preferably 100: 3-5. The Yangbuck resin and the crude Yangbuck powder are foaming resin formulas which are continuously optimized by the inventor, and the proportion of the Yangbuck resin and the crude Yangbuck powder is preferably controlled within the range, so that the foaming effect is further improved, and the formed wool feeling is more exquisite.

Preferably, the viscosity of the polyurethane foaming resin slurry is 1200-1600cps, which affects the coating uniformity and the film forming effect, and the viscosity can be controlled within the above range after mixing according to the proportion of the raw materials. If the viscosity is not within the above range, the adjustment is carried out by using an organic solvent, and the organic solvent is selected from any one of butanone, methyl acetate and toluene, and butanone is preferred.

In some embodiments, the polyurethane foaming resin slurry is coated by a roll coating method, that is, a roll coater is used for coating, so that the coating uniformity and the subsequent foaming effect can be better ensured. Specifically, the sizing amount in the roller coating process is 200-240g/m, preferably 210-230 g/m; the speed of the roller coating process is 10-18m/min, preferably 14-16 m/min; the drying temperature after the roller coating is finished is 70-130 ℃, and preferably 90-110 ℃. The process parameters are preferably controlled within the above ranges during the roll coating process to further improve the coating uniformity and to make the subsequent foaming uniform.

The high-temperature foaming process is carried out for 2-4min under the conditions of 165-185 ℃; preferably, the high temperature foaming process is carried out at 170-185 ℃ for 2-3 min. The inventor finds that the temperature and the treatment time in the high-temperature foaming process have obvious influence on the foaming effect, and if the foaming temperature is too low, the foaming cannot be fully performed, and the foaming is small; if the foaming temperature is too high, the foam will be broken and a smaller foam layer will be formed. The control principle of the treatment time is similar to that of the temperature, and the control principle is to ensure that the foaming is sufficient and prevent the foaming from being too large and broken.

S3, grinding

And (3) polishing the surface of the material after the high-temperature foaming is finished, and destroying a foam layer formed by foaming so as to obtain fine hair feeling close to the frosted leather. The surface is polished by a sanding machine in the polishing process, and the thickness before and after sanding is controlled to be reduced by 0.1-0.15mm in the sanding process; the sanding process adopts 100-140-mesh sand paper, the rotating speed is 900-1200r/min, and the speed of the sanding machine is 4-6 m/min. The technological parameters of the polishing process are strictly controlled, and the polishing force is too large or too small, so that the fur feeling of the surface layer of the synthetic leather base cloth is influenced.

The embodiment of the invention also provides the leather-imitated microfiber leather which is prepared by applying the preparation method of the leather-imitated microfiber leather, and the leather-imitated microfiber leather is prepared by improving a synthesis process, adopting a sequence of firstly coating a bonding coating and then coating a foaming layer, directly forming the foaming layer on a bottom blank without using auxiliary materials such as paper and the like, is larger and uniform in foaming, and forms a finer hair feeling after being polished.

The embodiment of the invention also provides a simulated leather product which is prepared by applying the simulated leather microfiber leather; preferably, the imitation leather product is a shoe or a case.

The features and properties of the present invention are described in further detail below with reference to examples.