JP2020139095A - Hot-melt composition - Google Patents

Abstract

To provide a hot-melt composition that can significantly suppress stringiness after its application with an application device while maintaining excellent stability after its curing.SOLUTION: A hot-melt composition has noncrystalline polyalphaolefin (A), a tackifier (B), and soap (C). Preferably, the noncrystalline polyalphaolefin (A) has a melt viscosity at 190°C of 10,000-300,000 mPa s.SELECTED DRAWING: None

Description

The present invention relates to hot melt compositions.

In general, the hot melt composition is a solvent-free, environmentally friendly material that can be cured in a short time and is very easy to handle, so that it is possible to improve the working environment at the manufacturing site. Therefore, the hot melt composition is widely used in the field of precision such as automobiles and electric appliances, as well as in the field of construction.

In the past, applicants have contained at least styrene-based block copolymers, polyphenylene ether resins or modified polyphenylene ether resins with a thermal deformation temperature or glass transition point of 120 ° C. or higher, amorphous polyolefins, tackifier resins and anti-aging agents. We have invented a hot melt composition characterized by having a melt viscosity at 200 ° C. of 30 Pa · s or less (Patent Document 1). This composition is excellent in adhesion and adhesiveness to polyolefin-based materials, and also has good heat resistance and heat aging resistance, and has a low melt viscosity at around 200 ° C., so that it has good coatability and ejection property. It was excellent in workability.

JP-A-2007-99795

By the way, in the manufacturing process of parts in the automobile field and the electric field, a hot melt composition that does not require a drying facility is preferably used in order to improve productivity, and is hot in order to be applied efficiently in a short time. A method of applying with a coating device such as a melt gun is adopted. However, since the hot melt composition in a molten state is viscous and it is difficult to control the fluidity, even if only the required amount is applied to the required place, a thread is formed between the hot melt composition and the discharge portion of the hot melt gun. There was a problem that the hot melt composition remained like pulling, and further improvement was required.

An object to be solved by the present invention is to provide a hot melt composition capable of remarkably suppressing stringing after coating by a coating device while maintaining excellent stability after curing. ..

The present invention is a hot melt composition comprising a non-crystalline polyalphaolefin (A), a tackifier (B), and a soap (C).

The hot melt composition according to the present invention has an effect that stringing after coating by a coating device can be remarkably suppressed while maintaining excellent stability after curing.

<Non-crystalline polyalphaolefin>
In the present invention, the non-crystalline polyalphaolefin (A) is used. Hereinafter, the component (A) may be referred to as "APAO". The component (A) is used as a base polymer of the hot melt composition according to the present invention.

The melt viscosity of the component (A) at 190 ° C. may be in the range of 10,000 to 300,000 mPa · s. The lower limit thereof is preferably more than 10,000 mPa · s, more preferably 20,000 mPa · s or more, further preferably 30,000 mPa · s or more, and 40,000 mPa · s or more. Is particularly preferred. The upper limit thereof is preferably less than 300,000 mPa · s, more preferably 250,000 mPa · s or less, further preferably 200,000 mPa · s or less, and 180,000 mPa · s. The following is particularly preferable.

Here, when the melt viscosity of the component (A) at 190 ° C. is less than 10,000 mPa · s, it tends to be unsuitable as a base polymer because it is difficult to control the fluidity. On the other hand, when the melt viscosity at 190 ° C. is more than 300,000 mPa · s, the occurrence of stringing can be suppressed to some extent, but the workability at the time of coating tends to deteriorate.

Further, the weight average molecular weight of the component (A) may be in the range of 10,000 to 300,000. The lower limit thereof is preferably more than 10,000, more preferably 20,000 or more, and particularly preferably 30,000 or more. The upper limit thereof is preferably less than 300,000, more preferably 250,000 or less, and particularly preferably 200,000 or less.

Here, when the weight average molecular weight of the component (A) is within the above range, there is a tendency that both fluidity and workability can be achieved at the same time.

The type of the component (A) includes homopolymers such as polypropylene and polybutene-1, which are non-crystalline polymers, and copolymers of propylene and monomers selected from ethylene, 1-butene, and 1-hexene. Alternatively, tarpolymer and the like can be mentioned.

As for the blending ratio of the component (A), it is preferable to blend 30 to 80% by weight, more preferably 35 to 75% by weight, and 40 to 60% by weight, based on the entire composition. Especially preferable.

Specific examples of the component (A) include VESTOPLAST 828 (trade name, manufactured by Ebonic, melt viscosity (190 ° C.): 25,000 mPa · s, weight average molecular weight: 61,000), VESTOPLAST 751 (trade name, ebonic). Co., Ltd., melt viscosity (190 ° C.): 50,000 mPa · s, weight average molecular weight: 88,000), VESTOPLAST 792 (trade name, manufactured by Ebonic, melt viscosity (190 ° C.): 120,000 mPa · s, weight average Molecular weight: 118,000), VESTOPLAST 888 (trade name, manufactured by Ebonic, melt viscosity (190 ° C.): 120,000 mPa · s, weight average molecular weight: 104,000) and the like.

<Adhesive agent>
In the present invention, the tackifier (B) is used. As the softening point of the component (B), a range of 60 to 200 ° C. can be mentioned. The lower limit thereof is preferably more than 60 ° C, more preferably 70 ° C or higher, and particularly preferably 80 ° C or higher. The upper limit thereof is preferably less than 200 ° C, more preferably 190 ° C or lower, and particularly preferably 180 ° C or lower.

As for the blending ratio of the component (B), it is preferable to blend 1 to 300 parts by weight, more preferably 10 to 200 parts by weight, and 20 to 100 parts by weight with respect to 100 parts by weight of the component (A). It is particularly preferable to mix in parts.

Here, when the softening point of the component (B) and the blending ratio thereof are within the above ranges, the wettability of the surface of the adherend can be enhanced and the adhesion between layers can be improved. Tend.

Examples of the type of the component (B) include terpene resin, terpene phenol resin, aliphatic petroleum resin, aromatic petroleum resin, alicyclic petroleum resin, rosin resin, and modified products thereof.

Specific examples of the component (B) include T-REZ HA085 (trade name, manufactured by JXTG Energy Co., Ltd., hydrogenated alicyclic petroleum resin, softening point: 88 ° C.), T-REZ HA125 (trade name, JXTG Energy). Water-added alicyclic petroleum resin, softening point: 125 ° C), T-REZ HB125 (trade name, manufactured by JXTG Energy Co., Ltd., hydrogenated aromatic petroleum resin, softening point: 125 ° C), YS resin PX1250 (Product name, Yasuhara Chemical Co., Ltd., terpene resin, softening point: 125 ° C), YS Polystar U130 (Product name, Yasuhara Chemical Co., Ltd., terpene phenol resin, softening point: 130 ° C), YS Polystar T160 (trade name, Yasuhara Chemical Co., Ltd.) , Terpene phenolic resin, softening point: 160 ° C.) and the like.

<Soap>
In the present invention, soap (C) is used. By using the component (C), even a hot melt composition in a molten state, which is viscous and whose fluidity is difficult to control, can be remarkably suppressed in stringing. In general, examples of "soaps" include "soap" which is composed of sodium salt and potassium salt and is soluble in water, and "metal soap" which is composed of calcium salt and magnesium salt and is insoluble in water. , In the present invention, it is necessary to use the former.

The chemical structure of the component (C) is composed of a fatty acid and a metal salt, and the fatty acid is preferably a higher fatty acid having about 8 to 30 carbon atoms. Specific examples thereof include stearic acid, 12-hydroxystearic acid, lauric acid, behenic acid, and montanic acid.

The melting point of the component (C) is preferably 160 ° C. or higher, more preferably 170 ° C. or higher, and particularly preferably 180 ° C. or higher. Within this range, the degree of stringing can be further reduced.

The blending ratio of the component (C) is preferably 1 to 100 parts by weight, more preferably 3 to 80 parts by weight, and 5 to 50 parts by weight, based on 100 parts by weight of the component (A). It is more preferably blended in parts, and particularly preferably 10 to 30 parts by weight. Within this range, the occurrence of stringing can be efficiently suppressed.

Specific examples of the component (C) include sodium stearate (trade name, manufactured by Nitto Kasei Kogyo Co., Ltd., stearic acid soap, sodium salt, melting point: 225 ° C. or higher), NS-6 (trade name, manufactured by Nitto Kasei Kogyo Co., Ltd.). , 12-Hydroxystearic acid soap, sodium salt, melting point: 210-230 ° C), NS-8 (trade name, manufactured by Nitto Kasei Kogyo Co., Ltd., montanic acid soap, sodium salt, melting point: 200-220 ° C) and the like. ..

In the present invention, wax can be used as an auxiliary agent. By using the component, the dispersibility of the component (C) tends to be improved.

Examples of the type of the component include polyethylene wax and polypropylene wax. These waxes can be blended unmodified, but may be modified. In particular, when an acid-modified wax is used, the dispersed state of the component (C) tends to be further improved.

The melting point of the component may be in the range of 80 to 200 ° C. The lower limit thereof is preferably more than 80 ° C, more preferably 100 ° C or higher, and particularly preferably 120 ° C or higher. The upper limit thereof is preferably less than 200 ° C, more preferably 190 ° C or lower, and particularly preferably 180 ° C or lower.

Specific examples of the component include high wax NP500 (trade name, manufactured by Mitsui Chemicals, unmodified polypropylene wax, melting point: 161 ° C.), H-501 (trade name, manufactured by QINGDAO SINOPLAS, unmodified polypropylene wax, melting point: 160 ° C), H-503 (trade name, manufactured by QINGDAO SINOPLAS, non-modified polypropylene wax, melting point: 150 ° C), Viscol 660P (trade name, manufactured by Sanyo Kasei Kogyo, non-modified polypropylene wax), Umex 1010 (trade name) , Sanyo Kasei Kogyo Co., Ltd., maleic anhydride-modified polypropylene wax, melting point: 135 ° C., Umex 100TS (trade name, manufactured by Sanyo Kasei Kogyo Co., Ltd., maleic anhydride-modified polypropylene wax, melting point: 136 ° C.) and the like.

As for the blending ratio of the component, it is preferable to blend 1 to 100 parts by weight, more preferably 5 to 80 parts by weight, and 10 to 50 parts by weight with respect to 100 parts by weight of the component (A). Is particularly preferred.

Furthermore, in the present invention, an anti-aging agent can be used. Examples of the type of the component include phosphate type, naphthylamine type, p-phenylenediamine type, quinoline type, hydroquinone type, bis-tris-polyphenol type, thiobisphenol type, hindered phenol type and the like. Alternatively, two or more types can be used in combination. Specific examples of the component include Sumilizer GP (trade name, manufactured by Sumitomo Chemical Co., Ltd.), Songnox 1010 (trade name, manufactured by SONDWON, hindered phenol type) and the like.

The blending ratio of the component is preferably 0.01 to 20 parts by weight, more preferably 0.05 to 10 parts by weight, and 0.1 by weight, based on 100 parts by weight of the component (A). It is particularly preferable to blend up to 5 parts by weight. Within this range, deterioration due to heat can be efficiently suppressed.

The hot melt composition according to the present invention may contain various additives such as a filler, an antioxidant, and a preservative.

<Examples and Comparative Examples>
In the formulation shown in Table 1, the hot melt compositions of Examples and Comparative Examples were sufficiently kneaded by a kneader set at 190 ° C. Here, the numerical values in Table 1 represent parts by weight. The raw materials used are shown below.
APAO: VESTOPLAST 888 (trade name, manufactured by Evonik Industries, Ltd., melt viscosity (190 ° C.): 120,000 mPa · s)
Adhesive-imparting agent: T-REZ HB125 (trade name, manufactured by JXTG Energy Co., Ltd., hydrogenated aromatic petroleum resin, softening point: 125 ° C.)
Soap: Sodium stearate (trade name, manufactured by Nitto Kasei Kogyo Co., Ltd., stearic acid soap, sodium salt, melting point: 225 ° C or higher)
Metal soap: CS-6 (trade name, manufactured by Nitto Kasei Kogyo Co., Ltd., 12-hydroxystearic acid soap, calcium salt, melting point: 144-155 ° C)
Wax: Youmex 100TS (trade name, manufactured by Sanyo Chemical Industries, Ltd., maleic anhydride-modified polypropylene wax, melting point: 136 ° C)
Anti-aging agent: Songnox 1010 (trade name, manufactured by SONDWON, hindered phenolic)

The following physical property evaluations were carried out on the hot melt compositions obtained in the above examples and the like. The results are shown in Table 2.

<Hardness>
After the hot melt composition was completely melted at 180 ° C., it was processed into a cubic shape, cured at room temperature for 24 hours, and cut to prepare a test piece (10 mm × 10 mm × 10 mmt). Then, the hardness of the prepared test piece was measured in accordance with JIS K 6253-1997. A type A durometer (based on JIS K 6253-3) was used as the measuring device.

<Threading property>
The hot melt composition was put into a hot melt gun set at 180 ° C. and maintained for 1 hour to completely melt it. Then, the metal plate (10 cm × 10 cm × 1 mmt) placed on the floor surface is intermittently coated vertically from a height of 100 cm, and between the discharge portion of the hot melt gun after coating and the metal plate. The degree of stringing was observed.
◯: There is no stringing from the discharge part of the hot melt gun.
Δ: Threading of less than 50 cm occurred from the discharge portion of the hot melt gun.
X: A string of 50 cm or more was generated from the discharge portion of the hot melt gun.

The hot melt composition according to the example was able to remarkably suppress stringing after being applied by a coating device while maintaining excellent stability after curing. On the other hand, the hot melt composition according to the comparative example was remarkably inferior in stringability.

Claims (4)

A hot melt composition comprising a non-crystalline polyalphaolefin (A), a tackifier (B), and a soap (C). The hot melt composition according to claim 1, wherein the melt viscosity of the non-crystalline polyalphaolefin (A) at 190 ° C. is 10,000 to 300,000 mPa · s. The hot melt composition according to claim 1 or 2, wherein the soap (C) has a melting point of 160 ° C. or higher. The hot melt composition according to any one of claims 1 to 3, further comprising wax.