JPH0670302B2 - Attached cloth and its manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an attached cloth such as zekken, cotton pen and the like, and a method for producing the same. More specifically, the present invention relates to an attachment cloth that is flexible, easy to remove and repeat, and can be repeatedly removed and attached, and a method for producing the same.

(Prior art) Conventionally, the method of sewing to the clothing such as cotton pens and Zetsuken has been taken, but in recent years, it is not necessary to sew.
A method of applying an adhesive or the like and attaching it by adhesion is also adopted. However, with the cloth-like agent, the fabric itself tends to be hard. Also, once glued, it becomes very unsightly because it is difficult to peel off when it is no longer needed and the adhesive does not adhere to the fabric.

(Problems to be Solved by the Invention) Accordingly, the present invention provides an attached cloth which can be adhered to a cloth by an adhesive method, wherein the attached cloth is difficult, easy to attach and detach, and repeatable. It is a thing. Furthermore, more specifically, it does not fray when cut into any shape, can be easily attached with a low-temperature iron at 150 ° C or less, and can be easily peeled with moderate force when peeling. It is intended to provide an attached cloth which does not leave a polymer on the cloth and a manufacturing method thereof.

(Means for Solving Problems) That is, the present invention provides "(1) an adhesive attachment cloth obtained by laminating a cloth-like material and a thermoplastic polyurethane non-woven fabric, wherein the polyurethane has an average molecular weight of 500 to 3000. Adhesion consisting of a polyester diol, a low-molecular-weight diol with a molecular weight of less than 500, and 4,4'-diphenylmethane diisocyanate, and the weight% of nitrogen atoms in the polyurethane is 2.6 to 3.4. Sex attached cloth.

(2) In a method for collecting an adhesive attached cloth by collecting thermoplastic polyurethane fibers in a non-woven fabric on a cloth-like material by a melt blown method and bonding a non-woven fabric made of the urethane fiber onto the cloth-like material, Polyurethane consisting of polyester diol having a molecular weight of 500 to 3000, low molecular diol having a molecular weight of less than 500, and 4,4'-diphenylmethane diisocyanate, wherein the weight% of nitrogen atoms contained in the polyurethane is 2.6 to 3.4% Airflow temperature 25
Adhesive attached fabric with excellent adhesiveness and exfoliation property characterized by performing bonding and laminating directly on a cloth under the condition of 0 ° C to 300 ° C and pressure of 1.5 kg / cm ² gauge pressure or less. Manufacturing method. It is.

Next, the present invention will be described in more detail.

Polyurethane is a polymer elastic body composed of a soft segment and a hard segment and is usually synthesized from a polyol having a molecular weight of 500 to 5000, an organic diisocyanate having a molecular weight of 500 or less, and a chain extender having a low molecular weight.

In the present invention, the polyurethane has an average molecular weight of 500 to 300.
A polyester diol having a molecular weight of 0, a low molecular weight diol having a molecular weight of less than 500, and 4,4'-diphenylmethane diisocyanate (hereinafter abbreviated as MDI), and the weight% of nitrogen atoms contained in the polyurethane is 2.6 to 3.4%. It is essential that there is something.

Polyurethane can be obtained with various physical properties by changing the molecular weight, kind and ratio of these components. Up to now, polyurethane has been widely used for applications such as adhesives, films, foamed sheets, and wet and dry elastic yarns. It has long been well known that thermoplastic polyurethane is melt-molded by melt spinning, melt-blowing and the like, but appropriate adhesiveness and fiber moldability are required to achieve the object of the present invention. If the polymer has too strong adhesiveness, it will be difficult to remove it when peeling next time, and conversely,
Polymers that are difficult to adhere to require a high-temperature iron, which can cause the fabric to become shiny.

In a polyurethane comprising a polyester diol having an average molecular weight of 500 to 3000, a low molecular diol having a molecular weight of less than 500, and MDI, the weight% of nitrogen atoms in the polyurethane (hereinafter abbreviated as N%) becomes large. It is a component containing nitrogen atom in each component
The proportion of MDI, that is, the hard segment, becomes large, and the practical bonding temperature becomes high.

On the other hand, when N% is less than 2.6%, the hard segment becomes too small and the mechanical properties of the polyurethane remarkably deteriorate, and at the same time the adhesiveness becomes too strong, which is not preferable.

Naturally, polyurethane has a large thermal decomposability, and this problem is a problem particularly when melt molding is performed at a high temperature. That is, when the molecular weight is too small, ie less than 500, the elastic properties of the polyurethane obtained by reacting with MDI after heat melting are deteriorated, which is not preferable. On the other hand, when the molecular weight becomes too large and exceeds 3000, melt spinning property of polyurethane obtained by reacting with MDI,
Melt-blown property deteriorates sharply, which is not desirable.

On the other hand, in the case of a polyether diol, even if it is within the above-mentioned molecular weight, the heat resistance of the obtained polyurethane is poor and melt molding cannot be sufficiently performed.

Further, as the diisocyanate component, MDI is overwhelmingly superior in mechanical properties of polyurethane obtained compared to other diisocyanates.

For the above reasons, the N% is 2.6 to 3.4 in the polyurethane composed of the polyester diol having an average molecular weight of 500 to 3000, the low molecular weight diol having a molecular weight of less than 500, and MDI.
%Must. 2.8 ~ is more preferable
It is 3.2%.

Examples of the polyester-based diol include ethylene glycol, propylene glycol, 1,4-butanediol, 1,5-
Pentanediol, 3-methyl-1,5-pentanediol,
Alkane diols having 2 to 10 carbon atoms such as 1,6-hexanediol, neopentyl glycol, and 2-methylpropanediol, or a mixture thereof with glutanoic acid, adipic acid, pimelic acid, speric acid, sebacic acid, terephthalic acid, Saturated polyester diols obtained from C4-12 aliphatic or aromatic dicarboxylic acids such as isophthalic acid or mixtures thereof, or polylactone diols such as polycaprolactone glycol, polypropiolactone glycol, polyvalerolactone glycol Is preferably used.

The chain extender used in the present invention is a chain growth agent commonly used in the polyurethane industry, that is, a low molecular weight compound having a molecular weight of less than 500 and containing at least two hydrogen atoms capable of reacting with isocyanate, such as ethylene glycol or propylene glycol. , 1,4-butanediol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, cyclohexanediol, xylylene glycol, 1,4-bis (β-hydroxyethoxy) benzene are used. . Among them, 1,4-butanediol, 1,4-bis (β-hydroxyethoxy) benzene, 3-methyl-1,5-
Pentanediol can be effectively used.

Next, important points in the method for producing the attached cloth of the present invention will be described. To meltblown polyurethane, the polymer is typically 220
Melts at ℃ ~ 250 ℃, blown off with a high-pressure gas at the same temperature to form a sheet. At this time, the temperature is reduced due to the adiabatic expansion of the gas, and the air is entrained at the same time by the accompanying flow from the surroundings. At this time, polyurethane is highly activated and has low crystallinity as compared with a usual thermoplastic polymer for fiber molding, and thus self-adhesion occurs to form a sheet. However, it is necessary to devise a method for simultaneously adhering to other cloth surfaces. For that purpose, a polyester-based polyol having a relatively high thermal decomposition property is used and N
It is necessary to use a polyurethane of which the percentage is 3.4% or less and to spin the jet gas at a temperature of 250 ° C. or more and a pressure of 1.5 kg / cm ² gauge pressure or less, preferably 1.0 kg / cm ² or less.
That is, if the temperature is too high, the nozzle temperature rises and the decomposition of the polymer becomes severe, which is inappropriate. Further, when the pressure of the jetted gas becomes high, the adiabatic cooling becomes large, and the polyurethane thread-like cooling proceeds, resulting in insufficient bonding with the cloth surface. Usually, such conditions are not suitable for molding a general urethane fiber nonwoven fabric. This is because the yarn sticks to the belt or the like that collects the polyurethane filaments in the form of a web and cannot be wound up. Also in the case of the present invention, when the integrally molded sheet is wound on the cloth surface, it is preferable to wind it while inserting a release sheet such as a polyethylene film.

The cloth-like material used in the present invention includes various woven fabrics and nits,
Non-woven fabric, paper, etc. may be used, but stretchable ones such as nits are suitable as they are stretchable with urethane. Materials other than non-adhesive ones such as polyolefin, for example polypropylene, can be applied. In particular, it has good adhesiveness to natural fibers such as cotton, nylon, vinylon and the like.

(Examples) Hereinafter, embodiments of the present invention will be described with reference to specific examples, but the present invention is not limited to these examples.

Example 1 Molecular weight 1000 consisting of 1,4 butanediol and adipic acid
Polyester diol (71 parts), 4,4'-diphenylmethane diisocyanate (26 parts) and 1,4-butanediol (3 parts) were melt-polymerized to prepare a polyurethane having N% of 2.9%. Using this, the polymer melted at 250 ° C was per nozzle from the nozzles arranged at 0.3mmφ and 1mm pitch.
It is extruded at a discharge rate of 0.2 g / min, and air heated at 280 ° C is jetted from the slits placed on both sides at a pressure of 0.8 kg / cm ² gauge pressure to perform melt blown, and 15 cm is supplied on the running belt Polyester stretch fabric was collected and integrally molded.

The hot-melt adhesive attachment cloth thus obtained was flexible and could be easily attached to clothing or the like at an ironing temperature of 150 ° C. In addition, if it was peeled off with an appropriate force, the cloth could be peeled off without damaging the cloth and leaving no polyurethane on the cloth. Therefore, this laminate is very effective for applications such as cleaning, cotton pens, name cards, and the like.

Comparative Example 1 Polyurethane having N% of 2.0% was prepared by melt polymerization using exactly the same monomer as in Example 1 but changing only the composition used.

This was melt-blown onto the polyester stretch fabric under the same conditions by using the same apparatus as used in Example 1 to integrally form it.

The hot-melt adhesive laminate thus obtained was flexible and could be easily attached to clothes or the like at an ironing temperature of 150 ° C. or lower. However, since this has a very strong adhesive force, it is necessary to apply a fairly strong force when attempting to peel it off, and the body material such as clothes is deformed ugly and damaged.

Comparative Example 2 A polyurethane having N% of 4.1% was prepared by melt polymerization using exactly the same monomer as in Example 1 but changing only the composition used.

This was melt-blown onto the polyester stretch fabric under the same conditions using the same equipment as used in Example 1, and integrally molded.

The hotmelt adhesive laminate thus obtained has a thickness of 15
I tried to bond it to clothes with a 0 ° C iron, but it showed only very weak adhesion. If you raise the ironing temperature to 180 ° C and press it down strongly, adhesion will occur, but in this case, the part of the clothes that touched the iron at the time of adhesion will be shiny and will be attached to a cloth that cannot be put to practical use. Ivy.

Comparative Example 3 The same polyurethane as that used in Example 1 was melt blown on the polyester stretch fabric using the same apparatus to perform integral molding.

The melt blown conditions at this time are:
When the gas pressure was set to 2.2 kg / cm ² gauge pressure, the polyurethane-polyester stretch fabric was not sufficiently adhered and some parts were not formed integrally, and a hot-melt adhesive attached fabric that could be put to practical use could not be obtained. .

It is presumed that this is because the pressure of the jetting pressure became high, the adiabatic cooling after the jetting of the gas became large, the cooling of the polyurethane filaments also proceeded, and the bonding force with the woven surface was not sufficiently developed.

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location G09F 7/00 N 7610-5G

Claims (2)

[Claims] 1. An adhesive attachment cloth obtained by laminating a cloth and a thermoplastic polyurethane non-woven fabric, wherein the polyurethane is a polyester diol having an average molecular weight of 500 to 3000, a low molecular diol having a molecular weight of less than 500, and 4 An adhesive attached cloth excellent in adhesiveness and exfoliation property, which is composed of 4,4'-diphenylmethane diisocyanate and has a weight% of nitrogen atoms contained in polyurethane of 2.6 to 3.4%. 2. A method for producing an adhesive attached cloth by collecting thermoplastic polyurethane fibers in the form of a non-woven fabric on a cloth-like material by a melt blown method, and adhering the non-woven fabric comprising the urethane fiber onto the cloth-like material. A polyester-based diol having an average molecular weight of 500 to 3000, a low-molecular diol having a molecular weight of less than 500, and 4,4'-diphenylmethane diisocyanate having a nitrogen atom weight percentage of 2.6 to 3.4% in the polyurethane. Excellent adhesion and peeling characteristics, characterized by performing bonding and bonding while melt-blown directly onto a cloth under the conditions of jet air temperature of 250 ℃ to 300 ℃ and pressure of 1.5kg / cm ² gauge pressure or less. Manufacturing method of adhesive attached cloth.