JPS599278A - Method for manufacturing suede-like synthetic leather - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the ability to produce synthetic leather having a suede-like texture and a slimy feel.

Suede and silky obtained by processing natural leather are used for many purposes such as clothing, furniture, accessories, and shoe material (A), but due to lack of resources, material heterogeneity, and yield. Because natural resources have problems such as poor quality, various attempts have been made to develop synthetic materials to replace them.

- In general, the production of suede-like synthetic leather consists of exposing a synthetic resin layer that gives the appearance and feel of natural leather and a suede-like feather-like fibrous body on top of the base fabric, which is profitable. Traditionally, this method involves (a) forming a porous polyurethane layer on the raised cloth 1-, and then polishing it to remove the skin layer;
Raw cloth or synthetic resin sheet 1- with short fibers flocked,
(c) There are 11 known methods in which fabrics that have been brushed and sheared are treated with a resin and softened by dipping in hot water, finishing agents, forced fabric shrinkage means, etc. However, for some reason,
In the case of b), D+ in the polyurethane layer formation period.
Since strong solvents such as a F (dimethylformamide) are used, color fastness is poor, there are technical problems in creating and maintaining the design color, and the resin layer tends to fall off during the polishing process. Porous pores tend to become uneven,
There is a problem that it is difficult to obtain homogeneity in appearance, and in the case of (b) above, there is a problem that the flocked short fibers are easy to pull out and the appearance is easily damaged. Because stress is generated internally during the shrinkage process, its use is limited to items that are not subject to external forces, such as clothing and furniture, and materials for items that are subject to severe usage conditions such as shoes are used for strength reasons and suede-like appearance. There were problems with maintainability, and it was difficult to obtain a product that could be used for general purposes.

In view of the above problems, the present invention has excellent strength.

This was done with the aim of providing a method for manufacturing suede-like synthetic leather that is versatile, inexpensive, and easy to manufacture, and involves impregnating a fluffy base material with plastisol.

The plastisol is gelatinized and foamed at the same time, the single fluff fiber buried in the plastisol resin layer is made to stand up three-dimensionally by foaming, and then the surface is ground and the surface of the resin layer is subjected to surface treatment. It is characterized by exposing the fibers inside.

The present invention will be explained below with reference to diagrams showing the process.

The method for producing suede-like synthetic leather (FIG. 1) of the present invention is a woven or non-woven fabric made of synthetic fibers such as polyamide fiber, polyester, fiber 7R, and natural fibers such as cotton, alone or in a blend, A foaming agent is mixed and dispersed in the group 4: A1 having fluff IA obtained by raising or shearing, and plastisol 2 is impregnated and penetrated (A) in Fig. 1. This is gelled and foamed at the same time to form a plastisol resin. The fluff fibers IA buried in the layer 2A are made to stand up three-dimensionally by foaming (B in Figure 1), and then the surface of the resin layer 2 is subjected to puffing, slicing, grinding, polishing, and surface treatment. It is configured to obtain suede-like synthetic leather by exposing the fibers IA in the foam cells 2 A' (O in FIG. 1).

” - In the examples described above, if the strength of the obtained suede-like synthetic leather is to be particularly strong, as shown in Figure 2, synthetic fibers such as polyamide fibers and polyester fibers and natural fibers such as cotton may be used alone or A fabric made by laminating a raised fabric IB made of a woven fabric or a non-woven fabric made of a blended fabric and a non-woven fabric IC and integrating them by needle punching or the like is used.

In addition, as plastisol, paste resin pv
g C polyvinyl chloride), plasticizers, stabilizers, fillers,
・Used with colorants, surfactants, viscosity modifiers, foaming agents, and other additives.

” In item 1, pva is the average molecular weight P = 1000 to 3
Paste 17 Gin, which is 000 and has excellent dispersibility in plasticizers, is used. In addition, from the standpoint of performance and workability.

It is preferable to use one with p=1600 to 2200.

The plasticizer is POP (di-ofbourg phthalate),
n-DOP, DOA (di-octyl adipate), DO8 (di-octyl seno(cate), DOZ
(di-octyl azelate) is used as the main plasticizer, and in some cases, an auxiliary plasticizer is added. The selection of the main plasticizer depends on the purpose of use or the processability of plastisol (flow characteristics).
In consideration of this, one type or two or more types are used in combination. Takashi Addibu is
40 to 150 parts by weight per 100 parts by weight of the above P V C, preferably 60 to 100 parts by weight based on texture and foam cell strength.
Stabilizers in weight parts include dibasic lead phosphite, organotin mercaftide,
Barium - cadmium series, organotin malate, barium -
Zinc-based stabilizers, cadmila l, /< +1 um zinc-based, calcium-zinc-based, tribasic lead sulfate, etc. are used, but it is preferable to use liquid stabilizers that have excellent dispersibility in plastisol. In addition, the stabilizer should be used at a temperature of 1° below the artificial temperature of the foam cell in accordance with the decomposition start temperature of the foaming agent. In addition, the number of added parts is 4J PVC], OO1rifi)
i'fl(L vs'I, 1~5 F3-n1 part)-
do.

fL'in shavings include calcium carbonate, baryta, kaolini-ri1/I, silica, mica, titanium white, hydroxide 1'
Lumi-Uno, etc. may be added as a bulking agent or to improve the flow characteristics of plastisol, or to maintain impact resistance and bending resistance in low-temperature atmospheres and to obtain a uniform foam cell structure.
It is preferable that the amount is 1.20 parts by weight or less per 10 parts of v c , and in some cases, no additive is added.

The coloring agent is prepared in the form of a paste, and then colored into the desired color using a coloring agent made of dried powder or a dry powder of normal phase, plasticizer, and resin.

Surfactants are added to adjust the viscosity of plastisol, improve fluidity, and improve processability.
It is desirable to use a nonionic activator that exhibits less bloom or bleed phenomena and has excellent thermal stability, and specific examples include polyethylene glycol monolaurate ester, polyethylene ethylene phenol ether, and the like.

The viscosity modifier has a plus decyl yield value of 1. It is added for the purpose of increasing viscosity and adjusting viscosity, and suitable amounts of aluminum stearate, amine-modified monomer, silicon dioxide, etc. are used.

This viscosity modifier prevents excessive penetration into raised fabrics and nonwoven fabrics and adjusts the degree of impregnation.

Azodicarbonamide (ADCA) is used as a blowing agent to adjust the decomposition temperature7, and a blowing aid may be used in order to obtain uniform expansion/m cells.

Other additives that can be added include practical use 1 for resin layers.
．． Modifiers, such as reactive plasticizers, thermally crosslinkable olicomers, blended polymers, etc., are added to enhance the necessary performance of the IJ coating, and wetting agents are added to improve IJ impregnation properties. Agents, softeners, etc. are used.

In addition, when coloring both the base fabric 1 and the plastisol due to design requirements, the color tone of the plastisol that is impregnated with the base fabric is different from the color tone of the plastisol that is impregnated into it to create a suede design on the surface and a sense of depth that is munched with the color tone. It is also preferable to dye it in a deep color tone.

Hereinafter, specific examples will be described.

Example 1 p v a (P=-1700) 100 parts by weight DOP B
Ott Foaming Stabilizer 3 Foaming Agent (ADOA) 3 tt Face Stabilizer
600ml/Crn2 of the paste mixture in 1.
After coating, a non-woven fabric (polyester 30O
f7VW, thickness approximately 1.2 mm) were laminated with pinch rolls (upper rubber roll, lower iron roll, clearance 1.5 mJ), and deaeration and wrinkle removal of the nonwoven fabric were performed.

The paste formulation was then heated at 140°C for 60 seconds to reduce the viscosity of the paste formulation, impregnated into the nonwoven fabric and semi-gelled, and then the release paper was removed (approximately After foaming 3 times and completely cooling, the surface was huffed 1: to expose the fluffy fibers buried inside, resulting in fine-pile suede-like PVC paste leather. .

Example 2 Using the same paste formulation as in Example 1, a bar coater was used to coat 500 mm of release paper 1- with a thickness of 7 m. Approximately 1mm
) so that the raised side of the coated layer is in contact with the coating layer, and laminated with a pitch roll (1-...rubber roll, bottom...iron roll, clearance 1.1 mm), deaerated, and removed wrinkles from the base fabric. went.

Next, the paste formulation was heated at 140°C for 60 seconds to reduce the viscosity, impregnated into the raised fabric and semi-gelled, then the release paper was removed and heated at 200°C for 90 seconds to reduce the viscosity of the paste formulation.
After foaming was carried out twice and completely cooled, the fluffy fibers buried inside were exposed by puffing to obtain a coarse velor-like PvC paste leather with one pile.

As mentioned above, this invention is FM! 1′
Adds a similar effect.

(1) Foaming ↑1. After impregnating the base fabric with plus decyl? 6 Bubble L Gel f is caused by the group 1 entangled with the resin.
The hair of 'l+ stands up evenly and evenly, and the resin layer and base fabric are tightly intertwined with each other due to impregnation and fluff! Because it is a special adhesive, it is difficult to peel off, and the base fabric and resin layer can be integrated without using a separate adhesive, making it extremely strong.

(2) Unlike wet or dry polyurethane dipping foaming, strong solvents are not used, so fading of the dyed base fabric can be prevented and any desired coloring can be easily applied.

(3) Polishing, fuzz exposed after grinding, polishing,
The combination of ground foam cells creates a fine-grained fluffy feel, giving it a more suede-like appearance.

(4) 6-hair has excellent appearance and strength, and can be used not only for clothing, furniture, and accessories, but also as wall cosmetics and shoe base materials, which are often exposed to external forces. It is extremely versatile compared to the previous one.

(5) Impregnation, development i'fM d'Kei',('-T
It is an abbreviation for A7yirhC-r,I', and can be manufactured at low cost.

[Brief explanation of drawings]

FIG. 1 is an explanatory view showing a manufacturing process according to the present invention, and FIG. 2 is a side view showing another embodiment. 1... Group 4A, IA... Fluff, 2... Plastisol, 2A... Plastisol resin layer, 2 A'...
foam cell.

Claims (4)

[Claims] (1) After impregnating the group H that makes fluff with plastisol, the plastisol is gelled and foamed at the same time, and the fluff fibers buried in the plastisol resin layer are made to stand up three-dimensionally by foaming, and then the surface is ground. A method for producing suede-like synthetic leather, characterized by subjecting the surface of the resin layer to surface treatment to expose the fibers in the foam cells. (2) The method for producing suede-like synthetic leather according to claim 1, wherein the group 4A having fluff is a raised fabric. (3) The method for producing suede-like synthetic leather according to claim 1, wherein the fluffy material is a nonwoven fabric. (4) The fluffy base material is laminated with raised fabric and nonwoven fabric.
A method for producing suede-like synthetic leather according to claim 1, wherein the suede-like synthetic leather is obtained by