Hot-melt composition

Abstract

To provide a hot-melt composition that exhibits excellent application workability due to its appropriate level of molten viscosity, also displays excellent mechanical properties after solidification, and preserves consistent durability even in low-temperature environments.SOLUTION: A hot-melt composition comprises an olefin-based elastomer (A), a tackifier (B), and an olefin-based wax (C), wherein the olefin-based wax (C) is derived from a plant source.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a hot melt composition. [Background technology]

[0002] Hot melt compositions have been widely researched and developed. Hot melt compositions melt when heated and solidify when cooled to room temperature of about 23°C, and are therefore suitable for use as adhesives. Their characteristics include being solvent-free, environmentally friendly, curing in a short time, and being a very easy-to-handle material, and because they can improve the working environment at manufacturing sites, they are widely used in a variety of fields.

[0003] In the past, the applicant of the present application invented a hot melt composition comprising an olefin elastomer (A), a tackifier (B), and a wax (C), the olefin elastomer (A) comprising an olefin elastomer (a1) having a melt flow rate (ASTM D-1238, 230°C / 2.16kg) of 1 to 500g / 10min and an olefin elastomer (a2) having a melt viscosity (190°C) of 100 to 30,000mPa·s (Patent Document 1). This hot melt composition exhibits adhesive strength to fibrous materials, has good workability due to its long open time and moderate melt viscosity, and is also excellent in impact resistance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-164652 A

[0005] Conventionally, in various fields, filters made of fibrous materials have been provided inside products for the purposes of exhausting heat, filtering, and preventing the intrusion of foreign matter, and hot melt compositions are preferably used to process and fix the shape of the filter in accordance with the internal structure of each product.

[0006] In recent years, biomass resources that are not dependent on petroleum resources have been attracting attention, and in various technical fields, petroleum-derived raw materials are being replaced with plant-derived raw materials. However, when hot melt compositions are used for filters installed in transportation equipment and electrical appliances, there is a demand for improving the mechanical properties at the same time, and there is room for improvement. Summary of the Invention [Problem to be solved by the invention]

[0007] The problem to be solved by the present invention is to provide a hot melt composition which has a suitable melt viscosity and hence good coating workability, has excellent mechanical properties after solidification, and can maintain a certain degree of durability even in a low-temperature environment. [Means for solving the problem]

[0008] The present invention relates to a hot melt composition comprising an olefin-based elastomer (A), a tackifier (B), and an olefin-based wax (C), wherein the olefin-based wax (C) is derived from a plant. Effect of the Invention

[0009] The hot melt composition of the present invention has an appropriate melt viscosity, and therefore has good coating workability, excellent mechanical properties after solidification, and is effective in maintaining a certain degree of durability even in a low-temperature environment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] <Olefin elastomer> In the present invention, an olefin-based elastomer (A) is used as a base polymer for the hot melt composition of the present invention.

[0011] The structure of the component (A) preferably contains propylene as a structural unit. The type of the component (A) may be a propylene homopolymer, or a copolymer or terpolymer of propylene and a monomer selected from ethylene, 1-butene, and 1-hexene. Among these, a propylene-ethylene copolymer or a propylene-1-butene copolymer is preferably used because of its high stability and ease of handling.

[0012] Examples of the type of olefin-based elastomer (A) include an olefin-based elastomer (a1) having a melt flow rate (ASTM D-1238, 230°C / 2.16 kg) of 1 to 500 g / 10 min, and an olefin-based elastomer (a2) having a melt viscosity (190°C) of 100 to 30,000 mPa s.

[0013] The melt flow rate of the (a1) component (ASTM D-1238, 230°C / 2.16 kg) is preferably 1 to 500 g / 10 min, more preferably 3 to 300 g / 10 min, and particularly preferably 5 to 200 g / 10 min. The melt viscosity (190°C) of the (a1) component cannot be measured because it is beyond the range that can be measured by a measuring device.

[0014] Specific examples of the component (a1) include propylene elastomers such as Vistamaxx 3980FL (trade name, manufactured by ExxonMobil, melt flow rate: 8 g / 10 min, ASTM D-1238, 230° C. / 2.16 kg).

[0015] The melt viscosity (190°C) of the component (a2) is preferably 100 to 30,000 mPa·s, more preferably 300 to 10,000 mPa·s, and particularly preferably 500 to 4,000 mPa·s. The melt flow rate (ASTM D-1238, 230°C / 2.16 kg) of the component (a2) cannot be measured because it is beyond the range that can be measured by a measuring instrument.

[0016] A specific example of the component (a2) is a propylene-based elastomer such as Vistamaxx 8880 (trade name, manufactured by ExxonMobil, melt viscosity (190° C.): 1,200 mPa·s).

[0017] Here, when the components (a1) and (a2) are used together, workability during application tends to improve slightly and the open time tends to be slightly longer, so it is preferable to use both components in combination.

[0018] The mixing ratio of the (a1) and (a2) components is preferably 1:0.1-10, more preferably 1:0.3-8, and particularly preferably 1:0.5-5, by weight ratio.

[0019] <Tackifier> In the present invention, a tackifier (B) is used. Examples of the type of component (B) include terpene resins, terpene phenol resins, rosin resins, aliphatic hydrocarbon resins, aromatic hydrocarbon resins, alicyclic hydrocarbon resins, and hydrogenated or modified products thereof.

[0020] The softening point of the component (B) is preferably from 60 to 250°C, more preferably from 70 to 200°C, and particularly preferably from 80 to 180°C.

[0021] The blending ratio of the (B) component is preferably 1 to 1000 parts by weight, more preferably 2 to 500 parts by weight, and particularly preferably 3 to 300 parts by weight, per 100 parts by weight of the (A) component.

[0022] Specific examples of the component (B) include YS Resin PX1250 (trade name, manufactured by Yasuhara Chemical Co., Ltd., terpene resin, softening point: 120°C to 130°C), Tamanor 803L (trade name, manufactured by Arakawa Chemical Industries, Ltd., terpene phenol resin, softening point: 145°C to 160°C), Pine Crystal KR-85 (trade name, manufactured by Arakawa Chemical Industries, Ltd., rosin resin, softening point: 80°C to 87°C), HM-1000 (trade name, manufactured by Henghe Co., Ltd., aromatic hydrocarbon resin, softening point: 100°C), and T-REZ HA125 (trade name, manufactured by ENEOS Corporation, hydrogenated alicyclic hydrocarbon resin, softening point: 120°C to 130°C).

[0023] <Olefin wax> In the present invention, an olefin wax (C) is used. The use of component (C) not only imparts plasticity, but also improves the dispersibility of components (A) and (B), thereby enhancing the wettability of the adherend surface and improving the adhesion between the layers.

[0024] Although many of the components (C) are derived from petroleum, the present invention requires the use of a plant-derived component. For example, the method of producing the component (C) includes fermenting sugar contained in biomass resources such as sugar cane and corn to synthesize plant-derived alcohol, and producing the olefin wax (C) from the alcohol.

[0025] The inventors of the present invention have found that by using the component (C), the strength and elongation after solidification are high, resulting in excellent mechanical properties, and that a certain degree of durability can be maintained due to high flexibility at 0°C, and that the impact resistance is also excellent, and have completed the present invention. One of the factors that produces such an effect is presumably because there are differences in the manufacturing methods between plant-derived and petroleum-derived products, and the manufacturing method for the plant-derived product imparts polarity to the component (C).

[0026] Examples of the component (C) include polyethylene wax, polypropylene wax, etc. Among these, polyethylene wax is preferably used because it is highly stable and easy to handle.

[0027] The melting point of the component (C) is preferably from 70 to 200°C, more preferably from 80 to 180°C, and particularly preferably from 90 to 150°C.

[0028] The blending ratio of the (C) component is preferably 1 to 500 parts by weight, more preferably 10 to 400 parts by weight, and particularly preferably 20 to 300 parts by weight, per 100 parts by weight of the (A) component.

[0029] Specific examples of the component (C) include G-WAX 50E (trade name, manufactured by Braskem, polyethylene wax, derived from plants (sugar cane), melting point: 103° C.).

[0030] In the present invention, an antioxidant can be used as an additive. Examples of the type of the component include phosphites, naphthylamines, p-phenylenediamines, quinolines, hydroquinones, bis-tris-polyphenols, thiobisphenols, and hindered phenols, and one or more of them can be used in combination. Specific examples of the component include Sumilizer GP (trade name, manufactured by Sumitomo Chemical Co., Ltd.) and Songnox 1010 (trade name, manufactured by Songwon Co., Ltd.).

[0031] In addition, in the present invention, various additives such as fillers such as calcium carbonate, talc, and clay, preservatives, and colorants may be contained.

[0032] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to these descriptions. EXAMPLES

[0033] <Examples and Comparative Examples> The hot melt compositions of the Examples and Comparative Examples were produced by thoroughly kneading the ingredients in the formulation shown in Table 1 in a flask adjusted to 180° C. Here, the numerical values ​​in Table 1 represent parts by weight. The raw materials used are shown below. Vistamaxx 3980FL (product name, ExxonMobil, melt flow rate: 8g / 10min, ASTM D-1238, 230℃ / 2.16kg) Vistamaxx 8880 (product name, ExxonMobil, melt viscosity (190℃): 1,200 mPa s) HM-1000 (Product name, manufactured by Henghe, aromatic hydrocarbon resin, softening point: 100℃) G-WAX 50E (Brakkem product name, polyethylene wax, derived from plants (sugar cane), melting point: 103°C) PE H-110 (product name, manufactured by SQI Thailand, polyethylene wax, petroleum-derived, melting point: 110°C) Songnox 1010 (product name, manufactured by Songwon, antioxidant)

[0034] [Table 1]

[0035] The hot melt compositions produced in the above examples were evaluated for various physical properties in the following manner. The results are shown in Table 2.

[0036] <Melt viscosity> Using a Brookfield viscometer, 10 g of the hot melt composition was melted at 180°C and allowed to stand for 10 minutes, after which rotation was started with a spindle No. 27 at a rotation speed of 5 rpm, and the melt viscosity (mPa·s) after 10 minutes was measured.

[0037] <Softening point> The softening point (° C.) of each hot melt composition was measured in accordance with JIS K 6863.

[0038] <Tensile strength / tensile elongation> The hot melt composition was melted at 180°C and formed into a sheet having a thickness of 2 mm, and then a test piece having a dumbbell No. 3 shape according to JIS K 6251 was prepared. The test piece was then aged at 23°C for 24 hours, and the tensile strength (N / mm 2 ) and tensile elongation (mm) were measured. Tensile strength is 3.0N / mm 2 Above are marked with ◎ and 3.0N / mm 2 Less than 2.5N / mm 2 The above are marked as ◯ and 2.5N / mm 2 Less than 2.0N / mm 2 The above are classified as △ and 2.0N / mm 2 Those with a tensile elongation of 280 mm or more were evaluated as ⊚, those with a tensile elongation of less than 280 mm and 240 mm or more were evaluated as ◯, those with a tensile elongation of less than 240 mm and 180 mm or more were evaluated as △, and those with a tensile elongation of less than 180 mm were evaluated as x.

[0039] <Impact resistance> The hot melt composition was melted at 180°C to prepare a sheet having a thickness of 4 mm, and then a test piece (80 mm x 10 mm x 4 mmt) was prepared. The test piece was aged at 23°C for 24 hours, and then a 2 mm notch was made in the thickness direction. A Charpy impact test was performed in accordance with JIS K 7111 to measure the impact strength (kJ / m 2 ) was measured. The impact strength was 1.2 kJ / m 2 Above are marked with ◎ and 1.2 kJ / m 2 Less than 1.0 kJ / m 2 The following are marked with a circle and 1.0 kJ / m 2 Less than 0.8 kJ / m 2 The following are △ and 0.8kJ / m 2 Those with less than this were rated as x.

[0040] <0℃ flexibility> The hot melt composition was melted at 180°C to form a sheet with a thickness of 2 mm, which was then cut to a size of 10 cm x 1 cm to prepare a test piece. The test piece was then cured at 0°C for 24 hours, after which the center portion was bent at a right angle, and the result was visually observed. The test pieces were rated as ⊚ when no cracks were observed in any part of the test piece, Δ when a crack was observed in any part of the test piece, and x when the test piece was broken.

[0041] [Table 2]

[0042] When the hot melt compositions according to the Examples and Comparative Examples were produced, the melt viscosity at 180°C and the softening point were similar, but the Examples had higher strength and elongation after solidification than the Comparative Examples, and therefore had superior mechanical properties and impact resistance.

Claims

1. The composition contains an olefin-based elastomer (A), a tackifier (B), and an olefin-based wax (C), A hot melt composition, characterized in that the olefin wax (C) is derived from a plant.

2. The hot melt composition according to claim 1, characterized in that the olefin-based elastomer (A) comprises an olefin-based elastomer (a1) having a melt flow rate (ASTM D-1238, 230°C / 2.16 kg) of 1 to 500 g / 10 min, and an olefin-based elastomer (a2) having a melt viscosity (190°C) of 100 to 30,000 mPa·s.

3. 3. The hot melt composition according to claim 1, which is used for a filter.

4. 3. An article manufactured using the hot melt composition according to claim 1 or 2.

Images