JP2891742B2 - Silk non-woven fabric and method for producing the same - Google Patents

Description

The present invention relates to a method for producing a silk nonwoven fabric.

[Prior art] Conventionally, silk used for clothing is one of the fibers of clothing materials.
Although it is the most beautiful and elegant, it is not possible to make clothing with a volume larger than the cross-sectional shape, and when using a large amount of silk, the price becomes considerably expensive.

If a silk nonwoven fabric is used, the density is lower than that of a conventional knitted fabric using a silk thread, and a voluminous garment with a large volume can be produced at low cost.

However, when trying to manufacture silk non-woven fabric, silk does not have the shrinking effect of wool, so simply entangled fibers mechanically weakens the entanglement of the fibers, causing the fibers to fall off and deforming the non-woven fabric. There is a problem that it is easy.

For this reason, the following first to third methods have been considered as methods for producing a silk nonwoven fabric.

The first method is a method for producing a nonwoven fabric using a silk fibroin solution as a binder, as disclosed in JP-A-1-118652.

The second method is that when fabricating a nonwoven fabric by a wet method using silk as a main fiber, the silk is cut into 2 to 10 mm because the entanglement is weak by itself, and pipes, Manila hemp, mitsumata are used as binder fibers to further increase the entanglement. This is a method of producing a nonwoven fabric by a wet method in combination with a cellulose fiber such as a polyolefin fiber, a modified polyester fiber, and a hot melt fiber such as a PVA fiber.

The third method is to cut silk to 30 to 100 mm, form a web with a hot-melt binder fiber such as polyolefin fiber, modified polyester fiber or the like using a mixing card machine, and then heat-treat to produce a nonwoven fabric by a dry method. Is the way.

[Problems to be Solved by the Invention] However, in the first method, it is necessary to prepare a silk fibroin solution, which is very troublesome, and there is a problem that the final nonwoven fabric is expensive. In addition, it can be judged that production of a roll-shaped and long one is considerably difficult.

On the other hand, when the silk nonwoven fabric produced by the second or third method is used for clothing, in the case of a product using a polyolefin fiber binder, the polyolefin fiber cannot be dyed at the time of dyeing, and a white residue is generated. In the case of using a hot-melt binder as a binder, the binder is re-melted when heat is applied to the binder at a temperature equal to or higher than the melting point by ironing or the like during heat setting or thermal drying after washing. Therefore, the silk non-woven fabric using the hot-melt binder has a problem that the fiber is hardened, the texture is different, and the product loses its shape. In the case of a non-woven fabric using cellulose fibers as binder fibers, the silk part can be dyed with an acid dye, and then the cellulose part can be dyed with a reactive dye, so that white residue of the fiber can be prevented. However, in order to provide sufficient mechanical strength, the amount of cellulose fiber used is required to be 20 to 50% in the silk non-woven fabric, which causes problems such as significantly impairing the original properties, gloss, and texture of silk. The silk nonwovens made were rarely used in clothing.

As described above, the silk nonwoven fabric made by the conventional technique has a problem of dyeability and a problem of heat resistance.

Therefore, an object of the present invention is to provide a silk nonwoven fabric which has good dyeability and heat resistance, and which can easily and inexpensively and easily produce a silk nonwoven fabric having silk original properties, gloss and texture, and a method for producing the same. I have.

[Means for Solving the Problems] In order to solve the above-mentioned object, the present invention comprises a silk cut as a main fiber, and a silk binder cut and beaten and fibrillated to further increase the wet strength. The gist of the invention is that it contains an agent.

The gist is that a wet strength enhancer is added to a silk binder cut and beaten and fibrillated, and a silk cut as a main fiber, and then papermaking is performed by a wet papermaking method.

[Function] The silk nonwoven fabric produced by the silk nonwoven fabric and the production method of the present invention can be dyed only by silk dyeing and acidic dyeing because the binder is also silk, and is an internal additive binder that withstands dyeing, bleaching and scouring. Since the resin is used in combination, the white residue can be completely eliminated by one-bath dyeing, and a decrease in strength can be prevented.

Furthermore, even if the amount of silk used is small, the density becomes low, so that a voluminous clothing can be obtained.

[Examples] Hereinafter, an example that embodies the present invention will be described.

P after cutting to 1mm with silk tow and guillotine type cutter
Perform a FI mill 5000 times to prepare a silk binder with a beating degree of SR30 °. In addition, a beater, a beater, a refiner, etc. other than a PFI mill are also possible. Cut length is 0.5
If the thickness is less than 0.5 mm, the binder effect is low and the strength of the silk nonwoven fabric is weak. If it exceeds 3.0 mm, the fibers become entangled and bound when beaten.

Next, 70% of a silk tow cut to 5 mm with a guillotine cutter and 30% of the silk binder are mixed with a beater or pulper. If the cut length is less than 2 mm, the strength of the silk non-woven fabric is low, and if it exceeds 10 mm, it results in binding due to poor dispersion and the cut length is desirably in the range of 2 to 10 mm.

At this time, if the ratio of the silk binder to the silk cut product is less than 10%, the mechanical strength is low, and if it exceeds 50%, the luster of the silk is lost.
50% is desirable.

Further, a wet strength agent is added to withstand the requisite scouring, bleaching and dyeing when the silk nonwoven fabric is embodied for clothing.

Here, in the case of silk dyeing, in a general prescription, the material to be dyed is put into an aqueous solution (about pH 5) containing an acid and its ammonium salt, and the aqueous solution is circulated at 30 to 40 ° C. for 10 to 20 minutes.
Then add the fully dissolved dye and slowly over 30-60 minutes
The temperature is raised to 80-90 ° C. and dyeing is carried out at that temperature for 30-60 minutes.

Incidentally, an acid dye is used as the dye. As the acid used in combination with the acid dye, acetic acid and its ammonium salt, or sulfuric acid and its sodium sulfate are commonly used.

During dyeing, acid is added according to the state of exhaustion, complete exhaustion is carried out, and after dyeing, it is treated directly with a fixing agent for dyes to improve wet fastness. It is important to select an acid-resistant wet strength agent that does not cause significant strength deterioration or deformation during dyeing.

Polyamideamine epichlorohydrin-based and polyamine epichlorohydrin-based resins, polyacrylamide derivatives, melamine, urea, formaldehyde condensates, and combinations of these with anionic polymers are used in general papermaking as wet paper strength enhancers.

Among the wet paper strength enhancers added during papermaking, polyamideamine epichlorohydrin-based resins and polyamine epichlorohydrin-based resins are particularly suitable as those resistant to acids.

Examples of the anionic polymer used in combination include anionic polyacrylamide, carboxymethyl cellulose, and carboxymethyl starch.

In addition, when selecting the wet paper strength enhancer, the amount of addition is also important, and it is preferable to add it several times as much as usual papermaking.

Silk non-woven fabric manufacturing equipment includes wet papermaking, circular net, short net,
Long nets and suction homers are possible, but in the case of slitting a silk non-woven fabric into a non-woven silk string, a circular net in which fibers are oriented vertically is most suitable.

In the following, silk binder SR30 ° and silk were mixed at various ratios, and a polyamidoamine epichlorohydrin-based resin was added as a wet paper strength enhancer to which 1% of the total amount of silk and silk binder was added. Shows the properties of silk non-woven fabric.

As shown in Table 1, when the ratio of the silk binder to the silk cut product is more than 50%, the breaking length and the specific tear are both strong and the silk non-woven string has sufficient mechanical strength as used. However, the luster peculiar to silk is lost. When the silk binder content is less than 10%, both the breaking length and the specific tear are low, and there is a lot of fluffing and falling off, and the mechanical strength such as paper breakage at the time of micro slitting is weak.

On the other hand, when a nonwoven fabric was prepared with a silk binder of 30% (Example 1 in Table 1) and silk-dyed, the breaking length was reduced by only 20%, and there was sufficient residual strength. No staining, no white residue, and a luster unique to silk was obtained.

As a result, the silk binder is most preferably 20 to 40% from the viewpoint of mechanical strength while utilizing the texture and luster of the silk, but the silk binder is 10% (Example 1 in Table 1) to 50% (first).
Table Example 2) has no practical problem and is within the scope of the present invention.

After slitting the silk non-woven fabric produced by this method to a width of 1 to 10 mm with a microslitter, twisting it with polyester filament and dyeing it, we made a knitted fabric with a flat knitting machine and made it into a sweater for spring and summer. It has good heat resistance, is very bulky, and can easily and inexpensively make clothing utilizing the properties, luster and texture of silk.

Finally, as a fourth example, Table 2 shows the properties of a nonwoven fabric formed by a round paper machine using the combination of the first example 3 and an aqueous solution of an anionic polymer in combination with the wet strength enhancer.

The silk binder is a silk tow cut to 1 mm3
The kg was put into a small beater together with 200 l of water, and was beaten to a freeness of 30 ° of Shopper Riegler and used to make paper using a round paper machine.

[Effects of the Invention] As described in detail above, the invention according to claim 1 can easily produce a silk nonwoven fabric despite the use of the fibrillated silk binder, and the produced silk nonwoven fabric has a dyeing property. It has good heat resistance and can have the inherent properties, luster and texture of silk.

According to the second aspect of the present invention, the silk nonwoven fabric can be easily manufactured at low cost.

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Claims (2)

(57) [Claims] 1. A silk nonwoven fabric comprising silk cut as a main fiber, a silk binder cut and beaten and fibrillated, and further comprising a wet strength enhancer. 2. A silk nonwoven fabric characterized by adding a wet strength enhancer to a silk binder cut and beaten and fibrillated, and silk cut as a main fiber, and then papermaking by a wet papermaking method. Manufacturing method.