阅读说明：本技术 一种聚氨酯浸渍液及其制备的超厚型高克重超细纤维合成革基布 (Polyurethane impregnating solution and super-thick high-gram-weight superfine fiber synthetic leather base cloth prepared from same ) 是由 杨银龙 赵鸿凯 孙向浩 赵明 李相锐 杜明兵 刘国 于 2019-11-20 设计创作，主要内容包括：本发明公开了一种聚氨酯浸渍液及其制备的超厚型高克重超细纤维合成革基布,一方面,本发明的聚氨酯浸渍液包含高低粘度的聚氨酯树脂A和B,在确保产品的生产过程、物性符合要求的前提下,确保了浸渍充分。另一方面,通过外喷油剂,使得海岛纤维在针刺时能够更加润滑,从而在高克重下获得更高密度的无纺布,能够为获得高密度烫平布及提高基布厚度和克重打下基础,同时,避免了基布中含有大量的断针,提高产品质量。本发明突破性地实现了厚度大于3.0mm、克重高于1300g/㎡的超细纤维合成革基布的制备,进一步提高了产品生产效率,降低了生产成本。(The invention discloses a polyurethane impregnating solution and an ultra-thick high-gram-weight superfine fiber synthetic leather base cloth prepared from the same. On the other hand, the sea-island fibers can be lubricated more during needling by the external oil spraying agent, so that a non-woven fabric with higher density can be obtained under high gram weight, a foundation can be laid for obtaining high-density ironing cloth and improving the thickness and the gram weight of the base cloth, and meanwhile, a large number of broken needles contained in the base cloth are avoided, and the product quality is improved. The invention realizes the preparation of the superfine fiber synthetic leather base cloth with the thickness of more than 3.0mm and the gram weight of more than 1300 g/square meter in a breakthrough manner, further improves the production efficiency of products and reduces the production cost.)

1. The polyurethane impregnating solution for the ultra-thick high-gram-weight superfine fiber synthetic leather base cloth is characterized by comprising the following components in parts by weight:

30-60 parts of polyurethane resin A

60-30 parts of polyurethane resin B

135 parts of N, N-Dimethylformamide (DMF)

The total amount of the polyurethane resin A and the polyurethane resin B is 90 parts;

the polyurethane resin A and the polyurethane resin B are respectively polyurethane resins with the viscosity of 10-15 Pa.S @25 ℃ and the viscosity of 80-120 Pa.S @25 ℃ when the solid content in DMF solvent is 30%.

2. The polyurethane impregnating solution according to claim 1, wherein the 100% tensile strength of the polyurethane resin A and the polyurethane resin B is 10-15 MPa.

3. The polyurethane impregnation fluid of claim 1, wherein the components further comprise a release agent.

4. The polyurethane impregnating solution according to claim 3, wherein the weight part of the release agent is 1.5-3.0 parts; the release agent is common polyether modified silicone oil type release agent, such as ADDITIVINENO.10 of Shanghai Nippon polymer materials Co.

5. The super-thick high-gram-weight superfine fiber synthetic leather base cloth prepared by using the polyurethane impregnation liquid of claim 1 is characterized in that the thickness is 3.0mm or more and the gram weight is 1300 g/square meter or more.

6. The ultra-thick high-gram-weight superfine fiber synthetic leather base cloth according to claim 5, wherein the thickness is 3.3-3.7mm, and the gram weight is 1350-.

7. The preparation method of the ultra-thick high-gram-weight superfine fiber synthetic leather base cloth according to claim 5, characterized by comprising the following steps:

(1) spraying the sea-island fibers with an oiling agent, and then carding, lapping and needling to obtain a non-woven fabric;

(2) ironing the non-woven fabric prepared in the step (1), and cooling to obtain ironed fabric;

(3) putting the ironing cloth prepared in the step (2) into polyurethane impregnation liquid, and carrying out impregnation, solidification, washing and toluene reduction to obtain wet base cloth;

(4) and (4) drying the wet base cloth prepared in the step (3) to obtain the super-thick high-gram-weight superfine fiber synthetic leather base cloth.

8. The method of claim 7, wherein in step (1), the sea-island fiber is sprayed with an oiling agent at the outlet of the hopper in the nonwoven fabric production line.

9. The method of claim 7, wherein the sea-island fiber is a fixed-island or indefinite-island fiber prepared by polyethylene/nylon 6 composite spinning, and has a fineness of 5 to 10dtex and a length of 4 to 6 cm;

the needling density of the non-woven fabric is 1000-²；

The lapping gram weight of the non-woven fabric is 1400-1600 g/square meter;

the density of the non-woven fabric is 0.24-0.26g/cm³。

10. The method of claim 7, wherein in step (2), ironing is performed in an oven, wherein the ironing length is 25 meters, and the vehicle speed is 3-7 meters/min;

the radius of the cooling roller and the rolling core of the ironing cloth is more than or equal to 0.5m during production;

the density of the ironing flat cloth is 0.30-0.34g/cm³；

In the step (4), the wet base cloth is dried on the mesh cloth at the temperature of 130-150 ℃, and the drying time is 25-35 minutes.

Technical Field

The invention relates to a polyurethane impregnating solution and super-thick high-gram-weight superfine fiber synthetic leather base cloth prepared from the same, and belongs to the technical field of superfine fiber synthetic leather.

Background

The superfine fiber synthetic leather is a composite material composed of superfine fibers and polyurethane, has the characteristics of structural simulation, air permeability, flexibility and the like, is one of ideal substitute materials of genuine leather, and is widely applied to the fields of sofas, automobiles, cases, shoes and the like.

The thickness range of the superfine fiber synthetic leather base cloth product is generally 0.5-3.0mm, and the product with the thickness exceeding 3.0mm cannot be prepared due to the reasons of non-woven fabric preparation, ironing and rolling crease, resin viscosity, impregnation difficulty and the like. Meanwhile, the restriction of the thickness further causes the grammage of the product to be unable to be raised. This limits the range of application of the product, such as not meeting the requirements of making special rugby balls, not being able to slice the skin many times, etc.

Disclosure of Invention

The invention aims to provide a polyurethane impregnating solution and an ultra-thick high-gram-weight superfine fiber synthetic leather base cloth prepared from the same, so as to overcome the defects in the prior art.

The polyurethane impregnating solution for the ultra-thick high-gram-weight superfine fiber synthetic leather base cloth comprises the following components in parts by weight:

30-60 parts of polyurethane resin A

60-30 parts of polyurethane resin B

135 parts of N, N-Dimethylformamide (DMF)

The total amount of the polyurethane resin A and the polyurethane resin B is 90 parts;

the polyurethane resin A and the polyurethane resin B are respectively polyurethane resins with the viscosity of 10-15 Pa.S @25 ℃ and the viscosity of 80-120 Pa.S @25 ℃ when the solid content in a DMF solvent is 30%;

the 100% tensile strength of the polyurethane resin A and the polyurethane resin B is 10-15 MPa; the polyurethane resin A and the polyurethane resin B can be the same polyurethane resin, are different in molecular weight, so that the viscosity is different under the same solid content, and the polyurethane resin in JF-W-TL4100, JF-W-TL4120 and JF-W-TL4150 high and low viscosity versions of Zhejiang Huafeng synthetic resin Co.

The weight portion of the N, N-dimethylformamide is preferably 210-360 portions.

The polyurethane impregnating solution can also comprise a release agent;

1.5-3.0 parts of release agent;

the release agent is common polyether modified silicone oil type release agent, such as ADDITIVE No.10 of Shanghai Nippon Polymer materials Co.

The super-thick high-gram-weight superfine fiber synthetic leather base cloth has the thickness of 3.0mm or more, the gram weight of 1300 g/square meter or more, preferably the thickness of 3.3-3.7mm, and the gram weight of 1350/square meter of 1570 g;

the preparation method of the super-thick high-gram-weight superfine fiber synthetic leather base cloth comprises the following steps:

(1) spraying the sea-island fibers with an oiling agent, and then carding, lapping and needling to obtain a non-woven fabric;

preferably, the sea-island fiber is firstly sprayed with an oiling agent at the outlet of a cotton bin in the non-woven fabric production line;

the sea-island fiber is a fixed island or indefinite island fiber prepared by polyethylene/nylon 6 composite spinning, the titer is 5-10dtex, and the length is 4-6 cm;

the oil agent is common spinning oil agent, such as HRD-2008 of Nantong Hengrun new material science and technology Limited company, and the oil agent spraying amount of each kilogram of sea-island fibers is 10-15 g;

the needling density of the non-woven fabric is 1000-²；

The lapping gram weight of the non-woven fabric is 1400-1600 g/square meter;

the density of the non-woven fabric is 0.24-0.26g/cm³；

(2) Ironing the non-woven fabric prepared in the step (1), cooling to obtain ironing cloth, wherein the ironing temperature is 110-;

the ironing cloth is characterized in that the radius of the cooling roller and the rolling core is more than or equal to 0.5 m;

the density of the ironing flat cloth is 0.30-0.34g/cm³；

(3) Putting the ironing cloth prepared in the step (2) into the polyurethane impregnation liquid, and carrying out impregnation, solidification, washing and toluene reduction to obtain wet base cloth;

(4) and (4) drying the wet base cloth prepared in the step (3) on a mesh cloth at the temperature of 130-150 ℃, wherein the drying time is 25-35 minutes, and thus obtaining the super-thick high-gram-weight superfine fiber synthetic leather base cloth.

Except for the specific description of the invention, the carding, lapping, coagulation, washing and weight reduction related to the invention are conventional, and the skilled person in the art can carry out the method according to the literature (such as the literature: Qujia wave. synthetic leather technology [ M ]. chemical industry Press, 2010.).

The technical principle of the invention is as follows:

firstly, in order to ensure sufficient impregnation, a method of compounding high-low viscosity polyurethane resin is utilized, and the sufficient impregnation is ensured on the premise of ensuring that the production process and physical properties of a product meet requirements, wherein the mechanism is that the low-viscosity polyurethane resin is easier to permeate into micropores of the non-woven fabric, and the high-viscosity polyurethane resin is more favorable for being adhered to the surface of the non-woven fabric; secondly, the sea-island fibers can be lubricated more during needling by additionally spraying an oiling agent at the outlet of the cotton bin, on one hand, the fibers are easy to tangle, and on the other hand, the felting needles are easy to reciprocate, so that a non-woven fabric with higher density can be obtained under high gram weight, a foundation can be laid for obtaining high-density ironing cloth and improving the thickness and the gram weight of the base cloth, meanwhile, a large number of broken needles in the base cloth are avoided, and the product quality is improved; and finally, by utilizing the principle that polyurethane and fibers shrink under the heating in a wet state, the polyurethane and the fibers freely shrink when heated and dried, so that higher thickness and gram weight are obtained.

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

the polyurethane impregnating solution disclosed by the invention is utilized to realize the preparation of the superfine fiber synthetic leather base cloth with the thickness of more than 3.0mm and the gram weight of more than 1300 g/square meter in a breakthrough manner, and further expand the application range of the superfine fiber synthetic leather. Meanwhile, the ultra-thick high-gram-weight product can be subjected to skin splitting for many times to obtain a thinner product, so that the production efficiency of the product is further improved, and the production cost is reduced.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention. In practice, the technical personnel according to the invention make improvements and modifications, which still belong to the protection scope of the invention.