JP2000129036A - Composition for sound insulation sheet and sound insulation sheet - Google Patents

Abstract

(57) [Problem] To provide a composition for a sound insulating sheet having a styrene thermoplastic elastomer as a base material and having excellent sound insulating properties and sheet formability. SOLUTION: Styrene-based thermoplastic elastomer (A)
Carbon black (B) 5 to 5 per 100 parts by weight
0 parts by weight, 200 to 1000 parts by weight of a high specific gravity inorganic filler and 0.5 to 5 parts by weight of a hydrocarbon slip agent (C) in a ratio of 0.5 to 5 parts by weight and a sheet-like composition thereof A processed sound insulation sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composition for a sound insulating sheet having excellent sound insulating properties, heat deformation resistance and flexibility, and a sound insulating sheet using the same.

[0002]

2. Description of the Related Art Hitherto, a sound insulating sheet using a composition obtained by adding a high specific gravity inorganic filler to various base polymers in a high blending amount has been used. Normally, sound insulation sheets are required to have flexibility and heat deformation resistance as well as sound insulation properties, but conventional compositions have excellent sound insulation properties, but many of them have insufficient flexibility and heat deformation resistance. Is required.

In response to this demand, Japanese Patent Laid-Open No. 62-2568
No. 45 proposes a sound-insulating composition in which an inorganic filler having a styrene-based thermoplastic elastomer and a styrene-butadiene copolymer thermoplastic resin having a high binding styrene content as a base polymer is highly filled. However,
In this composition, since the styrene-butadiene copolymer thermoplastic resin having a high binding styrene content (60 to 90% by weight) is used in combination, the hardness of the obtained sheet becomes too high, and the flexibility of blending is significantly restricted. Would. Further, the composition needs to have good workability so that it can be formed into a sheet having a thickness of about 1 mm.
This composition may be too hard to form a sheet.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sound insulating material having a styrene-based thermoplastic elastomer as a base material and having excellent sheet forming processability. An object of the present invention is to provide a sheet composition. The present inventors have made intensive efforts to achieve the above object, and as a result, among styrene-based thermoplastic elastomers, SIS
By using carbon black instead of the above-mentioned thermoplastic resin, the hardness was reduced, the degree of freedom of formulation was large, and it was found that a composition satisfying the above characteristics was obtained, and the present invention was completed. .

[0005]

According to the present invention,
5 to 50 parts by weight of carbon black (B), 200 to 1000 parts by weight of high specific gravity inorganic filler and 0.5 to 0.5 parts by weight of hydrocarbon slip agent (C) are added to 100 parts by weight of styrene-based thermoplastic elastomer (A). Provided is a composition for a sound insulating sheet, which is blended at a ratio of 5 parts by weight, and a sound insulating sheet obtained by forming the composition into a sheet.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described in more detail with reference to embodiments of the present invention. The styrene thermoplastic elastomer used in the present invention is a block copolymer having a styrene polymer block (S) and a conjugated diene polymer block (D), and is preferably an SDS-type linear or radial block copolymer. . As the conjugated diene polymer, polybutadiene (B) and polyisoprene (I) are generally used. Styrene-based thermoplastic elastomers include, for example, SBS and its hydrides SEBS, SIS,
Although SBIS is mentioned, SIS is preferable among these. The preferred styrene content of the styrene-based thermoplastic elastomer is 10 to 30% by weight.
If it is less than 30% by weight, the sheet forming processability becomes insufficient, and
When the content exceeds% by weight, the sheet hardness becomes undesirably high.
A more preferred styrene content is 15 to 25% by weight.

As the carbon black used in the present invention, any carbon black usually used in the rubber industry can be used and is not particularly limited. Preferred carbon black has an average particle size of 15 to 30 μm, and examples thereof include SRF and FEF. The compounding amount of carbon black is 5 to 50 parts by weight based on 100 parts by weight of the styrene-based thermoplastic elastomer. If the amount is too small, the hardness does not increase, and if the amount is too large, the hardness is undesirably increased. Preferably it is 5 to 25 parts by weight.

[0008] In the present invention, the high specific gravity inorganic filler used for exhibiting the sound insulating property may be any of the inorganic fillers conventionally used in the production of the sound insulating sheet and having a specific gravity of 2 or more, preferably 4 or more. Can also be used without particular limitation. For example, calcium carbonate, barium sulfate, magnesium sulfate, talc, clay, silica, mica, alumina, lithopone, graphite, zircon sand, chromite sand,
Examples include iron powder, iron sand, iron oxide, iron slag powder, iron sulfide, lead powder, and glass fiber. These can be used alone or in combination of two or more. The amount of the high specific gravity inorganic filler used is 200 to 1000 parts by weight based on 100 parts by weight of the styrene-based thermoplastic elastomer. It is necessary to determine the optimum use ratio from this range according to the required sound insulation.

Further, in the present invention, it is necessary to use a hydrocarbon slip agent (lubricant) in order to improve the sheet formability. Examples of the hydrocarbon slip agent include paraffin wax; higher fatty acids such as stearic acid and palmitic acid and metal salts thereof such as calcium, barium, magnesium and zinc; stearamide;
Fatty acid amides such as methylene (or ethylene) bis stearamide, oxystearic acid ethylene diamide and oleyl amide; fatty acid esters such as butyl stearate and methyl hydroxystearate; higher aliphatics such as palmityl alcohol and stearyl alcohol Alcohols include partial esters of higher fatty acids such as glycerin monostearate and diethylene glycol monostearate with polyhydric alcohols. The use amount of these hydrocarbon slip agents is usually 0.5 to 5 parts by weight based on 100 parts by weight of the styrene thermoplastic elastomer, and the optimum use amount is determined from this range and used.

In addition to the above, a thermoplastic resin, a softening agent, a flame retardant, and the like can be appropriately used as needed to satisfy the required performance. As the thermoplastic resin, for example, polystyrene, polyethylene, polypropylene,
Examples include an ethylene-vinyl acetate copolymer and polyphenylene oxide. The thermoplastic resin can be used in a proportion of 60 parts by weight or less based on 100 parts by weight of the styrene-based thermoplastic elastomer. As the softener, for example, asphalt, aromatic oil, naphthenic oil, paraffin oil, polybutene and the like can be mentioned, and may be used in a proportion of 50 parts by weight or less based on 100 parts by weight of the styrene-based thermoplastic elastomer. it can.

Examples of the flame retardant include inorganic hydrates such as aluminum hydroxide, magnesium hydroxide and basic magnesium carbonate, and inorganic flame retardants such as antimony oxide; tris (β-chloroethyl) phosphate, tris (2- Bromoethyl) phosphate, tris (dibromobutyl)
Phosphorus-based flame retardants such as phosphates; chlorine-based flame retardants such as chlorinated paraffin and chlorinated polyethylene; bromine-based flame retardants such as tetrabromoethane, tetrabromoethane, and 1,2-dibromo-3-chloropropane. Among them, inorganic flame retardants are preferable because they have a high specific gravity similarly to the high specific gravity inorganic filler and tend to have an effect of enhancing sound insulation. The preferred amount of the inorganic flame retardant is at least 200 parts by weight based on 100 parts by weight of the styrene-based thermoplastic elastomer (A). The upper limit of the amount is not particularly limited, but is usually 600 parts by weight or less. Is determined in consideration of sheet formability and cost. It goes without saying that the inorganic flame retardant can be used in combination with another flame retardant. In addition, when SIS is used as the styrene-based thermoplastic elastomer, even when a high specific gravity inorganic filler and an inorganic flame retardant are used together in a high blending amount, a sheet having excellent sheet processability and excellent flexibility is produced. Is possible.

The composition for a sound insulating sheet of the present invention is obtained by sufficiently mixing and kneading the styrene-based thermoplastic elastomer described above and each of the components with a conventional mixer such as a Banbury mixer, a kneader or a roll. Manufactured. The obtained composition is calendered, rolled, extruded (T
A predetermined thickness (usually 0.8 to 2 m) using a die
m) to obtain a sound insulating sheet of the present invention. The sound insulation sheet of the present invention has a hardness (JIS
A) is usually in the range of 40 to 85, preferably 55
~ 75. The specific gravity is about 2 to 3, preferably 2.3 to 2.6.

[0013]

Next, the present invention will be described specifically with reference to examples and comparative examples. Unless otherwise specified, parts and percentages below are by weight.

Examples 1 to 5 and Comparative Examples 1 to 5 SIS block copolymer (Quintac 3450 manufactured by Zeon Corporation:
Styrene content: 19%) or SBS block copolymer (Solprene T-414 manufactured by Asahi Kasei Corporation: styrene content: 4)
0%) and according to the formulation shown in Table 1 or Table 2,
A pressure kneader (volume 3)
00cc) at 150-200 ° C for 6 minutes.
The composition was prepared by kneading. Each of the obtained compositions was formed into a sheet and evaluated. The preparation method and evaluation method of the sheet are as follows. The evaluation results are shown in Tables 1 and 2.

(1) Preparation of Sheet Each of the above compositions was rolled with a roll heated to 125 to 130 ° C.
After heating for one minute, the roll gap is narrowed and a sheet is taken out to produce a sheet having a thickness of 1.1 to 1.2 mm. (2) Evaluation method Specific gravity: The composition was measured in accordance with JIS K7112 method A (water replacement method). Hardness: Measured with a sheet type tester according to JIS K6301 using a sheet. Sheet workability: Observe the roll releasability of the sheet at the time of taking out the sheet. ：: good (can be peeled off smoothly from the roll to take up the sheet) △: slightly poor (slightly poor peelability, the sheet tends to be taken up by the roll, and the sheet surface is slightly rough) ×: defective (peeling off) Sheet bending property: Using a Demasher bending tester according to JIS K6301, the bending of the test piece in compression-recovery (slightly compressed state) is repeated 1000 cycles. Observe the presence or absence of cracks after the test. ：: good (no cracks generated in 1000 cycles) ×: poor (cracks occurred in 1000 cycles)

Table 1

Table 2

(Note) (common to Tables 1 to 3) (1) Quintac 3450 manufactured by Zeon Corporation (2) Sorprene T-414 manufactured by Asahi Kasei Corporation (3) JB124A (low density polyethylene) manufactured by Japan Polyolefin Company (4) Nipol 2007J (85% styrene content) manufactured by Zeon Corporation (5) P-200 manufactured by Fujikosan Co., Ltd. (6) HV-100 manufactured by Nippon Petrochemical Co. (7) Asahi # 50 (SRF) manufactured by Asahi Carbon Co. (8) SM-1000 manufactured by Sakai Chemical Co., Ltd. (9) Kao-Wax E-BP manufactured by Kao Corporation (10) SL-700 manufactured by Takehara Chemical Industry Co., Ltd. (11) A-200 manufactured by Takehara Chemical Industry Co., Ltd.

Examples 6 to 10 Flame-retardant sound-insulating sheets were prepared according to the formulation shown in Table 3 in the same manner as in the above Examples and Comparative Examples, and sheet workability, sheet bending properties, and flame retardancy were evaluated. JIS is flame retardant
Tested according to K-A1322. Table 3 shows the results.

Table 3

(Note) (12) Heidilite H-42S manufactured by Showa Denko Corporation (13) 401A manufactured by Showa Denko Corporation (14) Shio Para 40 manufactured by Ajinomoto Co. (15) Mitsui Metal Mining Co., Ltd.

[0022]

According to the present invention described above, a composition for a sound insulating sheet and a sound insulating sheet having excellent sheet formability, flexibility, high specific gravity, excellent sound insulation, and heat deformation resistance are provided. In addition, by blending an inorganic flame retardant with a high specific gravity inorganic filler, it is possible to produce a flame-retardant sound insulating sheet. By using SIS as a styrene-based thermoplastic elastomer, the sheet processing moldability is maintained even when a high specific gravity inorganic filler or this and an inorganic flame retardant are blended in a high filling amount, and the sound insulating sheet is rich in flexibility. Can be manufactured.

Continued on the front page F-term (reference) 4F071 AA12 AA71 AA75 AB03 AB08 AB10 AB18 AB21 AB24 AB26 AB28 AC09 AC10 AC12 AE11 AE17 AF50 AH03 BB04 BB06 BC01 4J002 AE042 BP011 DA027 DA036 DE078 DE097 DE117 DE128 DE147 DJ047 DL007 EG038 EH018 EH058 EP018 FD017 FD138 FD178

Claims (3)

[Claims] 1. A styrenic thermoplastic elastomer (A)
Carbon black (B) 5 to 5 per 100 parts by weight
A composition for a sound insulating sheet comprising 0 parts by weight, 200 to 1000 parts by weight of a high specific gravity inorganic filler and 0.5 to 5 parts by weight of a hydrocarbon slip agent (C). 2. A styrenic thermoplastic elastomer (A)
The composition for a sound insulating sheet according to claim 1, wherein at least 200 parts by weight of an inorganic flame retardant is blended with respect to 100 parts by weight. 3. A sound insulating sheet obtained by molding the composition according to claim 1 into a sheet.