CN102535187A - Production method of crease-free microfiber mirror-surface synthetic leather - Google Patents

Abstract

The invention relates to the technical field of leather production, in particular to a production method of non-crease superfiber mirror surface synthetic leather. The invention provides a method for making non-creased microfiber mirror surface synthetic leather which can restore to its original state after the external force is removed and does not leave creases. The process steps are as follows: the microfiber substrate is combined with the hot-melt adhesive TPU film through the mirror embossing roller, and a layer of non-crease film is formed on the surface of the microfiber, and the superfiber semi-finished product is obtained → the mirror release paper is sequentially passed through a No., No. 2 and No. 3 coating heads, coat a layer of fabric, middle layer and primer on the surface in sequence → preheat the mirror release paper coated with fabric, middle layer and primer, and then process The finished microfiber semi-finished product is combined with the release paper coated with fabric, middle layer material and base material, and then dried in an oven to obtain a finished product.

Description

A kind of preparation method of non-crease microfiber mirror surface synthetic leather

technical field

The invention relates to the technical field of leather production, in particular to a method for producing non-creased superfiber mirror synthetic leather.

Background technique

In China, people are used to calling the artificial leather produced with PU resin and non-woven fabric as PU synthetic leather (synthetic leather for short). After continuous research and development, PU synthetic leather has grown rapidly in terms of product quality, variety, and output. Its performance is getting closer and closer to natural leather, and some properties even exceed natural leather, reaching the same level as natural leather. The degree of indistinguishability occupies a very important position in human daily life. PU synthetic leather is closer to leather fabrics in terms of chemical structure. It does not use plasticizers to achieve softness, so it will not become hard and brittle. At the same time, it has the advantages of rich colors and various patterns, and the price is cheaper than leather fabrics. , so it is very popular among consumers. But the existing PU synthetic leather that is mainly used for sports shoes still has deficiencies, mainly in that the products of PU synthetic leather will leave obvious creases or wrinkles on its surface after being bent or deformed, and when its After the external force is removed, it cannot fully return to the original state of the imitation leather, which affects the appearance of the product.

Contents of the invention

Therefore, in view of the above-mentioned problems, the present invention provides a method for making a non-crease microfiber mirror surface, and the non-crease microfiber mirror surface synthetic leather can be restored to its original state after the external force is removed without leaving creases.

In order to achieve the above object, the present invention is achieved through the following technical solutions: a method for making non-creased microfiber mirror surface synthetic leather, comprising the following process steps:

(1) Laminate the microfiber substrate with the hot-melt adhesive TPU film through the mirror embossing roller at a linear speed of 5-6 m/min, and form a non-crease film on the surface of the microfiber to obtain a semi-finished superfiber;

(2) Pass the mirror release paper through the No. 1 coating head, and coat a layer of fabric with a viscosity of 2500-3000cps on its surface. The fabric is made of PU resin with a weight ratio of 100:70-80:10-15: Dimethylformamide: toner composition;

(3) Pass the mirror release paper of the coated fabric in step (2) through the No. 2 coating head, and coat a layer of middle layer material with a viscosity of 3000-4000cps on the surface of the fabric, and the weight ratio of the middle layer material is 100 : 60～70: PU resin of 10～15: dimethylformamide: composition of toner;

(4) Pass the mirror release paper coated with the middle layer material in step (3) through the No. 3 coating head, and coat a layer of primer with a viscosity of 5000-6000cps on the middle layer material. The weight ratio of the primer is 100:40～50:10～15:5:2 PU resin: dimethylformamide: toner: crosslinking agent: accelerator;

(5) Preheat the mirror release paper coated with fabric, middle material and base material, then combine the treated microfiber semi-finished product with the release paper coated with fabric, middle material and base material, and then pass through the oven Finished products are obtained by drying.

A further improvement is: the temperature of the mirror embossing roller in the step (1) is controlled at 200-220°C.

A further improvement is: the preheating temperature in the step (5) is 60-80° C., the preheating time is 1 minute, and during the drying treatment, the oven temperature is 120-130° C., and the drying time is 6-7 minutes.

By adopting the aforementioned technical scheme, the beneficial effect of the present invention is: the present invention makes the hot melt adhesive TPU film cast on the surface of the microfiber by changing the proportion of the fabric, the middle layer material, and the prescription of the bottom material, and adopting a special process. A layer of crease-free film is formed on the surface of the microfiber. When it is combined with the mirror release paper coated with the fabric, the middle layer and the bottom material, the leather can return to the state before the deformation after the external force is removed without leaving creases. mark.

Detailed ways

The implementation of the present invention will be described in detail below in conjunction with specific examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention.

Embodiments of the present invention are:

A method for making non-crease microfiber mirror surface synthetic leather, comprising the following process steps:

(1) Laminate the microfiber substrate with the hot-melt adhesive TPU film through the mirror embossing roller at a line speed of 5.5m/min to form a non-crease film on the surface of the microfiber. The temperature of the mirror embossing roller is controlled at 210°C , to produce microfiber semi-finished products;

(2) Pass the mirror release paper through the No. 1 coating head, and coat a layer of fabric with a viscosity of 2750cps on its surface. The fabric is made of PU resin with a weight ratio of 100:75:12: dimethylformamide: toner Composition, the thickness of the coated fabric is 0.15mm;

(3) Pass the mirror surface release paper of the coated fabric in step (2) through the No. 2 coating head, and coat a layer of middle layer material with a viscosity of 3500cps on the fabric, and the weight ratio of the middle layer material is 100:65 : 13 PU resin: dimethylformamide: composed of toner, the thickness of the coated middle layer is 0.20mm;

(4) Pass the mirror-surface release paper coated with the middle layer material in step (3) through the No. 3 coating head, and coat a layer of primer with a viscosity of 5500cps on the middle layer material. The weight ratio of the primer is 100: 45:13:5:2 PU resin: dimethylformamide: toner: crosslinking agent: accelerator composition, the thickness of the coated primer is 0.18mm;

(5) Preheat the mirror release paper coated with fabric, middle material and bottom material. The preheating temperature is 70°C and the preheating time is 1min. The middle layer material and the mirror surface release paper of the bottom material are combined, and then dried in an oven to obtain a finished product. The oven temperature is 125°C, and the drying time is 6 minutes.

Among them, in step (1), the line speed of the microfiber substrate passing through the mirror embossing roller can be 5-6m/min, and the temperature of the mirror embossing roller can be controlled at 200-220°C; in step (2), the viscosity of the fabric can be 2500 ～3000cps, the weight ratio of PU resin: dimethylformamide: toner for the fabric can be 100:70～80:10～15; the viscosity of the middle layer material in step (3) can be 3000～4000cps, the middle layer material The prescription PU resin: dimethylformamide: toner weight ratio can be 100:60-70:10-15; the viscosity of the primer in step (4) can be 5000-6000cps, the prescription resin of the primer: two The weight ratio of methyl formamide: toner: crosslinking agent: accelerator can be 100:40-50:10-15:5:2.

The temperature involved in the above specific steps, the linear velocity, the weight ratio of various substances, and the viscosity range actually limit a feasible and ideal range, and the purpose of the invention can be achieved by using any numerical value in each value range. , The equipment involved in each process step, such as oven, mirror embossing roller, coating head, etc., belongs to known technology, so its structure will not be described in detail.

In the present invention, by changing the proportion of the fabric, the middle material and the bottom material, and adopting a special process, the hot melt adhesive TPU film is cast on the surface of the microfiber, and a layer of non-crease film is formed on the surface of the superfiber. Combined with the mirror release liner coated face, mid-layer and base material, the leather can return to its pre-deformed state after the external force is removed without leaving creases.

The above records are only examples of using the technical content of this creation. Any modifications and changes made by those who are familiar with this technology using this creation belong to the scope of patents claimed by this creation, and are not limited to those disclosed in the examples.

Claims (3)

1. a preparation method of not having the ultra fine mirror face synthetic leather of folding line is characterized in that, comprises following processing step:

(1) will ultra fine base compound through minute surface knurling rolls and PUR TPU film with the linear velocity of 5～6 m/min, there is not the folding line epithelium at ultra fine surperficial formation one deck, make ultra fine semi-finished product;

(2) mirror surface release paper being passed through a dispense tip, is the lining of 2500～3000cps in its surface coated one deck viscosity, and said lining is the PU resin of 100:70～80:10～15 by weight ratio: dimethyl formamide: toner is formed;

(3) mirror surface release paper that has been coated with lining in the step (2) is passed through No. two dispense tips; Its above lining coating one deck viscosity be the middle material of 3000～4000cps, middle material is the PU resin of 100:60～70:10～15 by weight ratio: dimethyl formamide: toner is formed;

(4) mirror surface release paper that has been coated with middle material in the step (3) is passed through No. three dispense tips; Coating one deck viscosity is the bed material of 5000～6000cps on the layered material therein, and bed material is the PU resin of 100:40～50:10～15:5:2 by weight ratio: dimethyl formamide: toner: crosslinking agent: promoter is formed;

The mirror surface release paper that (5) will scribble lining, middle material and bed material carries out The pre-heat treatment, and the ultra fine semi-finished product that will handle then combine with the release liners that scribbles lining, middle material and bed material, dries to handle through baking oven again to make finished product.

2. a kind of preparation method of not having the ultra fine mirror face synthetic leather of folding line according to claim 1 is characterized in that: the minute surface knurling rolls temperature in the said step (1) is controlled at 200～220 ℃.

3. a kind of preparation method of not having the ultra fine mirror face synthetic leather of folding line according to claim 1; It is characterized in that: the The pre-heat treatment temperature in the said step (5) is 60～80 ℃, and be 1min preheating time, when oven dry is handled; Oven temperature is 120～130 ℃, and drying time is 6～7min.