JPS6043877B2 - hot melt adhesive composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot melt adhesive composition.

Many hot-melt adhesives made from thermoplastic resins such as polyethylene, ethylene-vinyl acetate copolymers, ionomers, and nylon have been known.

Sumo wrestlers, polyethylene, ethylene-vinyl acetate copolymers, ionomers, and the like cannot be put to practical use because they do not have sufficient adhesive strength when used to bond metals and the like.

In addition, although nylon has a certain degree of adhesive strength to metals, it is still not sufficient, so nylon is mixed with epoxy resin or the like, or so-called nylon-epoxy adhesives, which are coated with epoxy resin on both sides of a nylon film, are used. Hot-melt adhesives have been proposed, but such adhesives require a considerable amount of time to complete curing and are also expensive, so they are not suitable for general use. It's not appropriate. In addition, attempts have been made to improve adhesive strength by mixing nylon with ethylene-vinyl acetate copolymer, ionomer, etc., but in all cases, satisfactory results in improving adhesive strength have not been obtained. Moreover, further improvement in the strength is desired. In view of the current situation, the present invention has been made for the purpose of providing a hot melt adhesive composition that has excellent adhesive strength to metals, etc., is easy to use, and is inexpensive. A hot melt adhesive composition characterized in that 1 to 4 parts by weight of thermoplastic polyurethane are mixed with the mass of the tumor. In the present invention, the nylon-based polymer is generally referred to as nylon, and is conventionally known to be used as a hot melt adhesive.

For example, it refers to nylon 12, nylon 11), nylon 6, nylon 6f), nylon 610, and copolymers thereof. In addition, thermoplastic polyurethane is
A polyurethane that is a high molecular weight linear polymer and exhibits thermoplastic properties, which is produced by the reaction of a polyester or polyether having an H group with a urethane prepolymer whose terminals are NCO groups obtained from a diisocyanate compound or polyol and diisocyanate. .

In order to produce the adhesive composition of the present invention, the nylon polymer and the thermoplastic polyurethane may be added and mixed to form an appropriate shape, such as powder or pellet form of these polymers. You can mix them together and run them in an extruder to form them into a film, line, or plate.
A method of kneading with a roll, kneader, Panbury mixer, etc. and forming into a sheet shape or the like can be suitably employed.

Regarding the amount of the nylon polymer and thermoplastic polyurethane used, it is necessary to use the latter in a range of 1 to 40 parts by weight per 10 parts by weight of the former.

The reason for this is that if the amount of thermoplastic polyurethane used is less than 1 part by weight, the effect of increasing the peel strength of the resulting adhesive composition will not be achieved, and if the amount exceeds 40 parts by weight, the effect of increasing the peel strength of the resulting adhesive composition will not be achieved. It is presumed that this is because the miscibility of the compound exceeds the limit, but the peel strength tends to decrease.

The adhesive composition of the present invention can be used for the same purposes as general hot-melt adhesives, but in particular metal materials such as iron, aluminum, copper, and brass, glass, ceramics, etc.
It exhibits excellent properties when used to bond inorganic materials such as slate and concrete, fibrous materials such as cotton, silk, wool, Tetoron and nylon fibers, and paper products.

Note that additives such as colorants and fillers may be added to the adhesive composition of the present invention as necessary. Since the hot melt adhesive composition of the present invention has the above-described structure, it can exhibit excellent adhesive strength.

Examples of the present invention will be described below.

Example 1 Copolymerized nylon (melting point 117°C, melt index 3
5) and polyurethane (Viscut softening point 105°C) in the proportions shown in Table 1 and drive blended, which was then extruded into a film with a thickness of 30 microns using an extruder to form a film adhesive. .

Next, this adhesive was degreased with acetone to a thickness of 0.67r0n.
placed between two galvanized steel plates at a temperature of 120°C and under pressure. 2
The steel plates were bonded together under bonding conditions of k91CT112 minutes, and after bonding, they were left for 2 days at 20° C. and a relative temperature of 60%.

The T-peel strength of the thus bonded galvanized steel sheets was measured.

The measurement conditions were a peeling temperature of 50 TWL/min and a sample width of 25 mm.
The temperature was 20°C and the humidity was 60%. Table 1 shows the measurement results of T peel strength.

Comparative Example 1 An adhesive was prepared in the same manner as in Example 1 using only copolymerized nylon (same as in Example 1), and the T-peel strength was measured.

The results were as shown in Table 1.

Comparative Example 2 Copolymerized nylon (same as Example 1) and ethylene-vinyl acetate copolymer (vinyl acetate content 19%, Mennold index 25) were blended in the proportions shown in Table 1. An adhesive was prepared in the same manner and the T peel strength was measured.

The results were as shown in Table 1. Comparative Example 3 An adhesive was prepared in the same manner as in Example 1 by blending copolymerized nylon (same as in Example 1) and ionomer (melting point: 99°C, melt index: 5) in the proportions shown in Table 1. T-peel strength was measured.

The results were as shown in Table 1. Example 2 An adhesive was prepared in the same manner as in Example 1 by blending nylon 12 (melting point: 179°C) and polyurethane (Vikato softening point: 105°C) in the proportions shown in Table 1.

Next, a sample was prepared in the same manner as in Example 1, except that bonding was carried out at a temperature of 240° C., a pressure of 2 k91 cIt, and a duration of 2 minutes, and the T-peel strength was measured. The results were as shown in Table 1. Comparative Example 4 The same procedure as Example 2 was carried out except that nylon 12 (same as in Example 2) was used alone as an adhesive.

The results were as shown in Table 1. Comparative Example 5 Same as Example 2 except that nylon 12 (same as Example 2) and ethylene-vinyl acetate copolymer (same as Comparative Example 2) were used as an adhesive in the proportions shown in Table 1. did.

The results were as shown in Table 1. Comparative Example 6 The same procedure as Example 2 was carried out except that nylon 12 (same as in Example 2) and ionomer (same as in Comparative Example 3) were used as an adhesive in the proportions shown in Table 1.

The results were as shown in Table 1. Examples 3 to 6, Comparative Examples 7 and 8 In the same manner as in Example 1, adhesives having the compositions shown in Table 2 were prepared, and the T-peel strength was measured.

The results were as shown in Table 2. Note that the copolymerized nylon and polyurethane were the same as in Example 1, and the nylon 1
The same ones as in Example 2 were used for Sample No. 2.

Claims (1)

[Claims] 1. A hot melt adhesive composition comprising 1 to 400 parts by weight of a thermoplastic polyurethane mixed with 100 parts by weight of a nylon polymer.