JPH0359070A - Powder for bonding fibers - Google Patents

Abstract

PURPOSE:To obtain the title powder which has a high adhesive power and makes it possible to retain the flexibility of fibers by mixing a polyamide copolymer powder having specified melting point and mean particle diameter with a flexibilizing aid having comparable melting point and mean particle diameter. CONSTITUTION:100 pts.wt. polyamide copolymer powder (e.g. a powder of nylon 6/66/12, 6/69/12, or 6/66/69/12 copolymer) having a melting point of 50-150 deg.C and a mean particle diameter of 1-33mum is mixed with 5-30 pts.wt. flexibilizing aid powder [e.g. an o- or p-toluenesulfonamide powder (m.p. 115 deg.C)] having a melting point of 50-120 deg.C and a mean particle diameter of 1-100mum to give a powder for bonding fibers. The powder, which comprises a mixture of a polyamide copolymer and a flexibilizing aid that has a melting point and a mean particle diameter both comparable to those of the former, can be used as a hot-melt adhesive, has a high adhesive power, and makes it possible to retain the flexibility of fibers.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a fiber adhesive powder that can be used as a hot melt adhesive, and more specifically, it has strong adhesion to textile products and improves the flexibility of textile products. The present invention relates to a powder for adhering fibers that can maintain a comfortable texture.

[Conventional technology]

Interlining used in the apparel field was traditionally fixed by sewing, but later on, due to the lack of sewing engineers and the need to improve their skills, sewing was replaced.
It has become common practice to provide hot-melt adhesive properties to the interlining and to bond and secure the interlining and outer material using only a heat press.

In order to give adhesive properties to the interlining, a true-melt resin is fixed to the surface of the interlining, but because a resin layer is formed on the surface of the interlining, the soft texture of the fibers tends to be lost. .

Therefore, in order to avoid damaging the texture of the fibers, we turned the hot melt adhesive into powder, and instead of dispersing it uniformly over the entire surface of the interlining, we arranged it in dots and mechanized this arrangement.
A so-called dotting machine has also been developed.

[Problem to be solved by the invention]

With the development of the dotting machine, hot melt adhesive powder is mechanically arranged on the surface of the interlining, and it is now possible to use it in the minimum amount, that is, to suppress the inhibition of the texture of the fibers by the resin as much as possible. The results are improving.

However, as long as fixation is done by adhesion, no matter how much the arrangement is devised, the resin layer necessary for adhesion will remain, so the fact is that no fundamental solution has been reached.

Therefore, apart from the dotting technique, the present inventor conducted intensive studies on changing the texture of the fibers by changing the properties of the adhesive itself, and as a result, the present invention was achieved.

[Means to solve the problem]

That is, the fiber adhesive powder of the present invention has a melting point of 50 to 150.
'C and has a melting point of 50 to 12% per 100 parts by weight of a boria gold copolymer powder with an average particle size of 1 to 300μm.
0° C., and 5 to 30 parts by weight of softening aid powder having an average particle size of 1 to 100 μm is mixed therein.

Hereinafter, the configuration of the present invention will be specifically explained.

Examples of the polyamide copolymer in the present invention include nylon 6/66/12. 6/69/12. 6/6
10/12. 6/612/12. , 6/66/610
/12. 6/66/69/12゜6/66/612/
12. 6/66/11/12. 6/66/69/1
A 1/12 copolymer can be mentioned. These boria-metallic copolymers must have a melting point of 50 to 150'C, preferably 100 to 120'C. The melting point of the copolymer can be changed by selecting the type and proportion of polyamide to be copolymerized.

Moreover, the polyamide copolymer in the present invention needs to be a powder with an average particle size of 1 to 300 μm. Such a powder can be obtained by freeze-pulverizing chips of the copolymer.

These powders can be classified into those with particle sizes of 300 to 1701III+, those of 170 to 60 μm, and those of 60 μm or less and used depending on the purpose.

On the other hand, the softening aid used in the present invention means a plasticizer for resins and polyalkylene oxide glycol.

Preferred plasticizers for resins are toluenesulfonamide compounds, such as o-, p-) toluenesulfonamide (mp, 115''C).

N-phenyl-P-toluenesulfonamide (mp,
100°C), N-isopropyl-〇-toluenesulfonamide (mp, 85°C), N-methyl-p-toluenesulfonamide (mp, 73°C), N-ethyl-
p-Toluenesulfonamide (mp, 63°C).

N-isopropyl-p-toluenesulfonamide (mp
, 50℃〉.

Further, examples of polyalkylene oxide glycols include polyethylene glycol and polypropylene glycol.

These softening aids must have a melting point of 50-120°C, preferably 70-110°C.

Further, the softening aid needs to have an average particle size of 100 tIn+ or less.

In the present invention, the above polyamide copolymer powder and softening aid powder are mixed. Mixing is performed using a mixer such as a Henschel mixer.

At this time, if the melting point of the powder is 50° C. or lower, blocking may occur or fluidity may be inhibited.

Therefore, the melting point of the powder in the present invention is limited to 50°C or higher. Furthermore, if the melting point is too high, it will no longer serve its purpose as a hot melt.

The amount of the softening aid added is 5 to 30 parts by weight, preferably 8 to 15 parts by weight, per 100 parts by weight of the polyamide copolymer.
Parts by weight. If it is less than 5 parts by weight, the softening effect is small;
If it exceeds 30 parts by weight, the adhesive strength will decrease.

In the present invention, 5 parts by weight or less of a lubricant can be added to 100 parts by weight of the polyamide copolymer in order to improve the fluidity of the powder.

Preferred lubricants include metal soaps such as magnesium stearate, calcium stearate, aluminum stearate, barium stearate, and silicon oxide compounds such as thyroid and irodil.

〔Example〕

The present invention will be specifically described below with reference to Examples.

Example 1 Nylon 6/66 with an average particle size of 150 μm and a melting point of 115°C
To 100 parts by weight of /610/12 copolymer powder, 10 parts of o-, p-) luenesulfonamide powder (mp, 115°C) with an average particle size of 120 μm and 0.5 parts by weight of magnesium stearate were added, The mixture was mixed for 3 minutes using a Henschel mixer and left for one day.

The obtained mixed powder was put into a hopper of a dotting machine, transferred onto a core surface using a mesh roller, and then fixed by heating.

The mesh roller has 17 points/inch and has a basis weight of 1
The weight is 2 g/rrf for 3 parts, and the interlining material is a brushed cotton wick.

The outer material was layered on this adhesive interlining and pressed. The outer material is 100% wool gabardine, and the pressing conditions are 230g pressure.
/af1. The temperature was 250°C for 1 hour and 15 seconds.

Cut this glued fabric into 1 inch wide strips,
@Peel strength was measured and the results are shown in the table with this as adhesive strength.

Example 2 Nylon copolymer nylon 6/66/12 (Ila
p.

An experiment similar to Example 1 was conducted except that the temperature was changed to 115°C.

Comparative Example 1 3 parts of polypropylene glycol with a degree of polymerization of 400 was added as a softening aid, and 0.3 parts of magnesium stearate was added.
The same experiment as in Example 1 was conducted except that the temperature was changed to

Comparative Example 2 Example 1 except that magnesium stearate is not added
A similar experiment was conducted.

◎: Very good O: Good Δ: Fairly bad It is a hot melt, has strong adhesive strength, and maintains fiber flexibility.

Claims (1)

[Claims] Melting point is 50~150℃, average particle size is 1~300μ
m for 100 parts by weight of polyamide copolymer powder,
Melting point is 50~120℃, average particle size is 1~100μ
Powder for fiber adhesion mixed with 5 to 30 parts by weight of softening aid powder.