JP2005068405A - Rubber composition - Google Patents
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- JP2005068405A JP2005068405A JP2004192915A JP2004192915A JP2005068405A JP 2005068405 A JP2005068405 A JP 2005068405A JP 2004192915 A JP2004192915 A JP 2004192915A JP 2004192915 A JP2004192915 A JP 2004192915A JP 2005068405 A JP2005068405 A JP 2005068405A
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Abstract
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本発明は、クロロプレン系ゴムの耐寒性を向上せしめるクロロプレン系ゴム用可塑剤、それを含有する、耐寒性、耐熱性及び耐油性に優れたクロロプレン系ゴム組成物、並びにこのクロロプレン系ゴム組成物を用いて得られる自動車用部材に関する。 The present invention relates to a plasticizer for chloroprene rubber that improves the cold resistance of chloroprene rubber, a chloroprene rubber composition containing the plasticizer and excellent in cold resistance, heat resistance and oil resistance, and the chloroprene rubber composition. The present invention relates to a member for an automobile obtained by use.
従来、ゴムの耐寒性を向上させる技術として、フタル酸エステル、アジピン酸エステルやポリエチレングリコール脂肪酸エステル等の可塑剤を添加する方法が知られている。しかし、これら従来の可塑剤では高温に曝された場合、揮発してしまい当初の耐寒性が損なわれてしまうという問題がある。さらにポリエステル系可塑剤等は揮発が起こりにくいが、本来の耐寒性が劣るという問題もある。 Conventionally, as a technique for improving the cold resistance of rubber, a method of adding a plasticizer such as phthalic acid ester, adipic acid ester or polyethylene glycol fatty acid ester is known. However, these conventional plasticizers have a problem that when exposed to high temperatures, they volatilize and the initial cold resistance is impaired. Furthermore, although a polyester plasticizer or the like hardly volatilizes, there is a problem that the original cold resistance is inferior.
これらの問題点を解決する技術が、特許文献１や特許文献２に開示されているが、これらの技術ではクロロプレン系ゴムにおいて、耐寒性がまだ十分に満足できるものではなかった。
本発明の課題は、クロロプレン系ゴムの耐寒性を更に改良した、クロロプレン系ゴム用可塑剤、並びに耐寒性、耐熱性及び耐油性を全て満足するクロロプレン系ゴム組成物を提供することにある。 An object of the present invention is to provide a chloroprene rubber plasticizer that further improves the cold resistance of the chloroprene rubber and a chloroprene rubber composition that satisfies all of the cold resistance, heat resistance, and oil resistance.
本発明は、数平均分子量２００〜６５０のポリオキシテトラメチレングリコールと脂肪族カルボン酸とのエステルを含有するクロロプレン系ゴム用可塑剤、クロロプレン系ゴム１００重量部に対して、この可塑剤を３〜５０重量部含有するクロロプレン系ゴム組成物、並びにこのクロロプレン系ゴム組成物を用いて得られる自動車用部材を提供する。 The present invention relates to a chloroprene rubber plasticizer containing an ester of a polyoxytetramethylene glycol having a number average molecular weight of 200 to 650 and an aliphatic carboxylic acid, and 100 parts by weight of the chloroprene rubber. A chloroprene rubber composition containing 50 parts by weight, and an automobile member obtained using the chloroprene rubber composition are provided.
本発明の可塑剤は、クロロプレン系ゴムに配合することにより、クロロプレン系ゴムの耐寒性を更に改良することができ、また、本発明のクロロプレン系ゴム組成物は、耐寒性、耐熱性及び耐油性に非常に優れたものであり、自動車用部材等として非常に有用である。 The plasticizer of the present invention can further improve the cold resistance of the chloroprene rubber by blending it with the chloroprene rubber, and the chloroprene rubber composition of the present invention has a cold resistance, heat resistance and oil resistance. And is very useful as a member for automobiles.
本発明の可塑剤は、数平均分子量２００〜６５０のポリオキシテトラメチレングリコールと、脂肪族カルボン酸とのエステル（以下本発明のエステルという）を含有する。 The plasticizer of the present invention contains an ester of a polyoxytetramethylene glycol having a number average molecular weight of 200 to 650 and an aliphatic carboxylic acid (hereinafter referred to as an ester of the present invention).
本発明のエステルの水酸基価は、クロロプレン系ゴムとの相溶性の観点から、好ましくは２０ｍｇＫＯＨ／ｇ以下であり、更に好ましくは１５ｍｇＫＯＨ／ｇ以下であり、特に好ましくは１０ｍｇＫＯＨ／ｇ以下である。 From the viewpoint of compatibility with the chloroprene rubber, the hydroxyl value of the ester of the present invention is preferably 20 mgKOH / g or less, more preferably 15 mgKOH / g or less, and particularly preferably 10 mgKOH / g or less.
尚、ここで本発明のエステルの水酸基価は、ＪＩＳ Ｋ００７０に基づいて測定した値である。 Here, the hydroxyl value of the ester of the present invention is a value measured based on JIS K0070.
また、本発明のエステルとしては、クロロプレン系ゴムとの相溶性の観点から、ジエステルであることが好ましく、ジエステル／モノエステル（重量比）は、８５／１５〜１００／０が好ましく、９０／１０〜１００／０がより好ましい。 The ester of the present invention is preferably a diester from the viewpoint of compatibility with the chloroprene rubber, and the diester / monoester (weight ratio) is preferably 85/15 to 100/0, 90/10 ~ 100/0 is more preferred.
本発明に係わるポリオキシテトラメチレングリコールの数平均分子量は、耐寒性の観点から、２００〜６５０であり、好ましくは２００〜４５０、更に好ましくは２５０〜４００である。 The number average molecular weight of the polyoxytetramethylene glycol according to the present invention is 200 to 650, preferably 200 to 450, more preferably 250 to 400, from the viewpoint of cold resistance.
尚、ポリオキシテトラメチレングリコールの数平均分子量は、水酸基価を用いて下記式により算出した値である。 In addition, the number average molecular weight of polyoxytetramethylene glycol is a value calculated by the following formula using a hydroxyl value.
数平均分子量＝［（５６．１×官能基数）／水酸基価］×１０００
本発明に係わる脂肪族カルボン酸としては、分岐飽和脂肪酸、直鎖飽和脂肪酸及び不飽和脂肪酸から選ばれる１種以上が挙げられ、炭素数８〜９の分岐飽和脂肪酸、炭素数６〜１０の直鎖飽和脂肪酸、炭素数１８〜２０の不飽和脂肪酸、トール油脂肪酸あるいはこれらの混合脂肪酸が好ましい。具体的には、２−エチルヘキサン酸、イソノナン酸等の分岐飽和脂肪酸、カプロン酸、カプリル酸、カプリン酸等の直鎖飽和脂肪酸、リノール酸、リノレン酸、オレイン酸等の不飽和脂肪酸、トール油脂肪酸等が挙げられ、２−エチルヘキサン酸、カプリル酸、リノール酸、オレイン酸、トール油脂肪酸が好ましく、カプリル酸、リノール酸、オレイン酸、トール油脂肪酸が更に好ましい。これらは１種単独でも、２種以上を併用してもよい。
Number average molecular weight = [(56.1 × functional group number) / hydroxyl value] × 1000
As aliphatic carboxylic acid concerning this invention, 1 or more types chosen from a branched saturated fatty acid, a linear saturated fatty acid, and an unsaturated fatty acid are mentioned, C8-C9 branched saturated fatty acid, C6-C10 direct Chain saturated fatty acids, unsaturated fatty acids having 18 to 20 carbon atoms, tall oil fatty acids, or mixed fatty acids thereof are preferred. Specifically, branched saturated fatty acids such as 2-ethylhexanoic acid and isononanoic acid, linear saturated fatty acids such as caproic acid, caprylic acid and capric acid, unsaturated fatty acids such as linoleic acid, linolenic acid and oleic acid, tall oil A fatty acid etc. are mentioned, 2-ethylhexanoic acid, caprylic acid, linoleic acid, oleic acid, tall oil fatty acid are preferable, and caprylic acid, linoleic acid, oleic acid, tall oil fatty acid are still more preferable. These may be used alone or in combination of two or more.
本発明のエステルの分子量は、低揮発性、耐熱性及び耐寒性の観点から、４００〜１０００が好ましく、５００〜８００が更に好ましい。 The molecular weight of the ester of the present invention is preferably from 400 to 1,000, more preferably from 500 to 800, from the viewpoints of low volatility, heat resistance and cold resistance.
本発明のエステルは、公知の方法、例えばポリオキシテトラメチレングリコールと、過剰の脂肪族カルボン酸とを、ジブチルスズオキシド等の金属触媒を高温下で加熱脱水することで容易に合成することができる。 The ester of the present invention can be easily synthesized by a known method, for example, polyoxytetramethylene glycol and excess aliphatic carboxylic acid by heat-dehydrating a metal catalyst such as dibutyltin oxide at a high temperature.
本発明の可塑剤中の本発明のエステルの含有量は、７５〜１００重量％が好ましく、８０〜１００重量％が更に好ましい。本発明の可塑剤は、本発明のエステル以外に、本発明のエステルを製造する際の未反応物である、ポリオキシテトラメチレングリコール、脂肪族カルボン酸；ジ（２−エチルヘキシル）フタレート、トリ（２−エチルヘキシル）トリメリテート、ブチルオレエート等のポリ塩化ビニル用の可塑剤；ポリオキシエチレンアルキルエーテルアジペート等のクロロプレンゴムに一般に配合される可塑剤等を含有することができる。 The content of the ester of the present invention in the plasticizer of the present invention is preferably 75 to 100% by weight, more preferably 80 to 100% by weight. The plasticizer of the present invention contains, in addition to the ester of the present invention, polyoxytetramethylene glycol, aliphatic carboxylic acid; di (2-ethylhexyl) phthalate, tri ( 2-ethylhexyl) plasticizer for polyvinyl chloride such as trimellitate and butyl oleate; plasticizer generally blended in chloroprene rubber such as polyoxyethylene alkyl ether adipate.
本発明のクロロプレン系ゴム組成物は、クロロプレン系ゴムと、本発明の可塑剤を含有する。本発明のクロロプレン系ゴム組成物中の本発明の可塑剤の含有量は、耐寒性、ブリードや他物性への影響、更にコスト的観点から、クロロプレン系ゴム１００重量部に対して、３〜５０重量部であり、好ましくは５〜４０重量部、さらに好ましくは１０〜３０重量部である。 The chloroprene rubber composition of the present invention contains a chloroprene rubber and the plasticizer of the present invention. The content of the plasticizer of the present invention in the chloroprene rubber composition of the present invention is 3 to 50 with respect to 100 parts by weight of the chloroprene rubber from the viewpoint of cold resistance, influence on bleed and other physical properties, and cost. Parts by weight, preferably 5 to 40 parts by weight, more preferably 10 to 30 parts by weight.
本発明に用いられるクロロプレン系ゴムは、クロロプレンゴムだけでなく、その変性物、例えばクロロプレンゴムの硫黄変性タイプ、非硫黄変性タイプ、特殊変性タイプのいずれも使用することができる。 The chloroprene rubber used in the present invention is not limited to chloroprene rubber, and any modified product thereof, for example, a sulfur-modified type, a non-sulfur-modified type, or a special-modified type of chloroprene rubber can be used.
本発明のクロロプレン系ゴム組成物は通常の混練機、例えばバンバリーミキサー、ロール、インテンシブミキサー等で容易に製造することができる。また、カーボンブラック、シリカ等の補強剤や加硫促進剤、加硫剤等、通常ゴムに配合される薬剤はもちろん、必要に応じて炭酸カルシウム、タルク、クレー等の充填剤や着色剤、紫外線吸収剤、汎用の可塑剤（フタル酸系、トリメリット酸系、リン酸系、エポキシ系等）等を適宜添加することができる。 The chloroprene-based rubber composition of the present invention can be easily produced with an ordinary kneader, such as a Banbury mixer, a roll, or an intensive mixer. In addition to reinforcing agents such as carbon black and silica, vulcanization accelerators, vulcanizing agents, and other chemicals that are usually blended in rubber, fillers and colorants such as calcium carbonate, talc, and clay, as needed, UV rays Absorbers, general-purpose plasticizers (phthalic acid-based, trimellitic acid-based, phosphoric acid-based, epoxy-based, etc.) can be added as appropriate.
本発明のクロロプレン系ゴム組成物は、耐熱性、耐寒性及び耐油性に優れたものであり、一般工業部品、自動車用部材等に用いることができ、自動車用部材、特に自動車用ゴム部品として好適に用いることができる。
具体的には、マフラーハンガーやエンジンマウント等の自動車用防振ゴム、等速ジョイントブーツ、ボールジョイントブーツ、ラックアンドピニオンブーツ、ギアブーツ等の自動車用ブーツ、ブレーキホースカバー、パワーステアリングホースカバー、フューエルホースカバー、オイルホースカバー等の自動車用ホースカバー、エアダクトホース等の自動車用ホース、タイミングベルト、Ｖベルト、ポリＶベルト、ラップドベルト、サーペンタインベルト等の自動車用駆動ベルト、自動車用空気バネ、自動車用ワイパーブレード、グロメット、ラバーブッシュ、ストラットマウント等の自動車用ゴム部品等がある。
また、高圧ホース、産業用ベルト、コンベアベルト、事務機器用ベルト、ゴムロール等の産業用ゴム部品や、支承ゴム等の土木建材用ゴム部品としても用いることができる。
The chloroprene-based rubber composition of the present invention is excellent in heat resistance, cold resistance and oil resistance, and can be used for general industrial parts, automobile members, etc., and is suitable as an automobile member, particularly an automobile rubber part. Can be used.
Specifically, automotive anti-vibration rubber such as muffler hangers and engine mounts, constant velocity joint boots, ball joint boots, rack and pinion boots, automobile boots such as gear boots, brake hose covers, power steering hose covers, fuel hoses Automotive hose covers such as covers and oil hose covers, automotive hoses such as air duct hoses, automotive driving belts such as timing belts, V belts, poly V belts, wrapped belts, serpentine belts, automotive air springs, automotive There are rubber parts for automobiles such as wiper blades, grommets, rubber bushes, and strut mounts.
It can also be used as industrial rubber parts such as high-pressure hoses, industrial belts, conveyor belts, office equipment belts, rubber rolls, and rubber parts for civil engineering and building materials such as bearing rubbers.
本発明のクロロプレン系ゴム組成物を使用して、自動車用部材を得る方法としては、公知の方法が用いられ、例えば、射出成形、押出成形、プレス成形等により得ることができる。 As a method for obtaining a member for an automobile using the chloroprene rubber composition of the present invention, a known method is used, and for example, it can be obtained by injection molding, extrusion molding, press molding or the like.
例中の％は特記しない限り重量％である。 In the examples, “%” is by weight unless otherwise specified.
合成例１
５００ｍＬ四つ口フラスコに数平均分子量２５０のポリテトラメチレングリコール（ＰＴＭＧと略記）１５０ｇ（０．６モル）、カプリル酸１９０．１ｇ（１．３２モル）、触媒としてジブチルスズオキシド０．１７ｇを秤取り、窒素を吹き込みながら２２５℃まで昇温し、脱水エステル化を８時間行った。その後、２００℃まで冷却し、６６６Ｐａ（５Ｔｏｒｒ）の真空で過剰のカプリル酸の留去を行い、エステル（ＰＴＭＧ２５０−ｎＣ８と略記）を得た。
Synthesis example 1
In a 500 mL four-necked flask, 150 g (0.6 mol) of polytetramethylene glycol (abbreviated as PTMG) having a number average molecular weight of 250, 190.1 g (1.32 mol) of caprylic acid, and 0.17 g of dibutyltin oxide as a catalyst are weighed. The temperature was raised to 225 ° C. while blowing nitrogen, and dehydration esterification was performed for 8 hours. Thereafter, the mixture was cooled to 200 ° C., and excess caprylic acid was distilled off under a vacuum of 666 Pa (5 Torr) to obtain an ester (abbreviated as PTMG250-nC8).
合成例２
表１に示す数平均分子量のＰＴＭＧとリノール酸を用い、合成例１と同様の条件でエステル化反応を行い、エステル（ＰＴＭＧ２５０−ＬＡと略記）を得た。
Synthesis example 2
An ester (PTMG250-LA) was obtained by performing an esterification reaction under the same conditions as in Synthesis Example 1 using PTMG having a number average molecular weight shown in Table 1 and linoleic acid.
合成例３
表１に示す数平均分子量のＰＴＭＧとオレイン酸を用い、合成例１と同様の条件でエステル化反応を行い、エステル（ＰＴＭＧ２５０−ＯＬと略記）を得た。
Synthesis example 3
An ester (PTMG250-OL) was obtained by performing an esterification reaction under the same conditions as in Synthesis Example 1 using PTMG having a number average molecular weight shown in Table 1 and oleic acid.
合成例４
表１に示す数平均分子量のＰＴＭＧとトール油脂肪酸を用い、合成例１と同様の条件でエステル化反応を行い、エステル（ＰＴＭＧ２５０−ＴＯと略記）を得た。
Synthesis example 4
An ester (PTMG250-TO) was obtained by performing an esterification reaction under the same conditions as in Synthesis Example 1 using PTMG and tall oil fatty acid having the number average molecular weight shown in Table 1.
合成例５
表１に示す数平均分子量のＰＴＭＧとカプリル酸を用い、合成例１と同様の条件でエステル化反応を行った後、過剰のカプリル酸を同様の条件で留去し、エステル（ＰＴＭＧ４００−ｎＣ８と略記）を得た。
Synthesis example 5
After performing esterification reaction under the same conditions as in Synthesis Example 1 using PTMG and caprylic acid having the number average molecular weight shown in Table 1, excess caprylic acid was distilled off under the same conditions, and ester (PTMG400-nC8 and (Abbreviation).
合成例６
表１に示す数平均分子量のＰＴＭＧと２−エチルヘキサン酸を用い、合成例１と同様の条件でエステル化反応を行った後、過剰の２−エチルヘキサン酸を同様の条件で留去し、エステル（ＰＴＭＧ２５０−２ＥＨと略記）を得た。
Synthesis Example 6
After performing esterification reaction under the same conditions as in Synthesis Example 1 using PTMG and 2-ethylhexanoic acid having the number average molecular weight shown in Table 1, excess 2-ethylhexanoic acid was distilled off under the same conditions. An ester (abbreviated as PTMG250-2EH) was obtained.
比較合成例１
５００ｍＬ四つ口フラスコに数平均分子量１０００のメチル分岐ポリテトラメチレングリコール（ＰＰＴＭＧと略記）（保土ケ谷化学工業（株）製）２５０ｇ（０．４モル）、２−エチルヘキサン酸１３８．２ｇ（０．９６モル）、触媒としてジブチルスズオキシド０．１８ｇを秤取り、合成例１と同様の条件でエステル化反応／脱酸を行い、エステル（ＰＰＴＭＧ１０００−２ＥＨと略記）を得た。
Comparative Synthesis Example 1
In a 500 mL four-necked flask, 250 g (0.4 mol) of methyl branched polytetramethylene glycol (abbreviated as PPTMG) (Hodogaya Chemical Co., Ltd.) having a number average molecular weight of 1000, 138.2 g of 2-ethylhexanoic acid (0. 96 mol), 0.18 g of dibutyltin oxide as a catalyst was weighed and subjected to esterification / deacidification under the same conditions as in Synthesis Example 1 to obtain an ester (abbreviated as PPTMG1000-2EH).
比較合成例２
表１に示す数平均分子量のＰＴＭＧと２−エチルヘキサン酸を用い、比較合成例１と同様の条件でエステル化反応／脱酸を行い、エステル（ＰＴＭＧ８５０−２ＥＨと略記）を得た。
Comparative Synthesis Example 2
An ester (PTMG850-2EH) was obtained by esterification / deacidification under the same conditions as in Comparative Synthesis Example 1 using PTMG having the number average molecular weight shown in Table 1 and 2-ethylhexanoic acid.
比較合成例３
表１に示す数平均分子量のＰＴＭＧとカプリル酸を用い、比較合成例１と同様の条件でエステル化反応／脱酸を行い、エステル（ＰＴＭＧ８５０−ｎＣ８と略記）を得た。
Comparative Synthesis Example 3
An ester (PTMG850-nC8) was obtained by performing esterification / deacidification under the same conditions as in Comparative Synthesis Example 1 using PTMG and caprylic acid having the number average molecular weight shown in Table 1.
比較合成例４
１，４−ブタンジオール（１，４ＢＤと略記）とオレイン酸を用い、比較合成例１と同様の条件でエステル化反応を行い、エステル（１，４ＢＤ−ＯＬと略記）を得た。
Comparative Synthesis Example 4
Using 1,4-butanediol (abbreviated as 1,4BD) and oleic acid, an esterification reaction was performed under the same conditions as in Comparative Synthesis Example 1 to obtain an ester (abbreviated as 1,4BD-OL).
合成例１〜６及び比較合成例１〜４で得られたエステルの水酸基価、ジエステル体とモノエステル体の割合をまとめて表１に示す。 Table 1 shows the hydroxyl values of the esters obtained in Synthesis Examples 1 to 6 and Comparative Synthesis Examples 1 to 4, and the ratios of diester and monoester.
エステル中のジエステル体含量、モノエステル体含量は、下記式により求めた。尚、ポリオキシテトラメチレングリコールと、過剰の脂肪族カルボン酸との反応において得られるエステル中の残存ポリオキシテトラメチレングリコールは微量である。従って、エステル中には、ポリオキシテトラメチレングリコールが実質、残存していないとして算出した。 The diester content and monoester content in the ester were determined by the following formula. Incidentally, the amount of residual polyoxytetramethylene glycol in the ester obtained by the reaction of polyoxytetramethylene glycol and excess aliphatic carboxylic acid is very small. Therefore, it was calculated that substantially no polyoxytetramethylene glycol remained in the ester.
実施例１〜６及び比較例１〜４
合成例１〜６及び比較合成例１〜４で得られたエステルを可塑剤として用い、クロロプレン系ゴム（ＣＲ系ゴム）で下記配合のゴム組成物を調製し、１７０℃、１０分加硫を行い、厚さ２ｍｍのテストピースを作製した。このテストピースについて、下記方法で耐寒性、耐熱性及びブリードを評価した。結果を表２に示す。
Examples 1-6 and Comparative Examples 1-4
Using the esters obtained in Synthesis Examples 1 to 6 and Comparative Synthesis Examples 1 to 4 as plasticizers, a rubber composition having the following composition was prepared with chloroprene rubber (CR rubber), and vulcanized at 170 ° C. for 10 minutes. A test piece having a thickness of 2 mm was produced. The test piece was evaluated for cold resistance, heat resistance and bleed by the following methods. The results are shown in Table 2.
＜ゴム組成物＞
ＣＲ系ゴム（デンカ Ｓ−４０Ｖ*1） １００．０重量部
ＳＲＦカーボン*2 ６０．０重量部
老防ＰＡ*3 ５．０重量部
酸化マグネシウム ４．０重量部
酸化亜鉛 ５．０重量部
ステアリン酸 ２．０重量部
加硫促進剤２２*4 ０．５重量部
可塑剤 ３０．０重量部
*1 デンカ Ｓ−４０Ｖ：電気化学工業（株）製、メルカプタン変性ＣＲゴム
*2 ＳＲＦカーボン:カーボンブラックＳＲＦ
*3 老防ＰＡ:Ｎ−フェニル−α−ナフチルアミン
*4 加硫促進剤２２:エチレンチオ尿素
＜耐寒性＞
ＪＩＳ Ｋ−６３０１（新ＪＩＳ Ｋ−６２６１）の方法で、ゲーマン捻り試験で耐寒性の評価を行った。Ｔ１００、Ｔ１０、Ｔ５、Ｔ２はそれぞれ、常温（２３℃）に比べ捻りモジュラスが１００倍、１０倍、５倍、２倍になる温度で、数字が低いほど耐寒性が良好なことを示す。
<Rubber composition>
CR rubber (Denka S-40V * 1 ) 100.0 parts by weight SRF carbon * 2 60.0 parts by weight Anti-aging PA * 3 5.0 parts by weight Magnesium oxide 4.0 parts by weight Zinc oxide 5.0 parts by weight Stearin Acid 2.0 parts by weight Vulcanization accelerator 22 * 4 0.5 parts by weight Plasticizer 30.0 parts by weight
* 1 DENKA S-40V: Mercaptan modified CR rubber, manufactured by Denki Kagaku Kogyo Co., Ltd.
* 2 SRF Carbon: Carbon Black SRF
* 3 Anti-aging PA: N-phenyl-α-naphthylamine
* 4 Vulcanization accelerator 22: Ethylenethiourea <Cold resistance>
Cold resistance was evaluated by the Gehman torsion test by the method of JIS K-6301 (new JIS K-6261). T100, T10, T5, and T2 are temperatures at which the torsion modulus is 100 times, 10 times, 5 times, and 2 times that of normal temperature (23 ° C.), respectively, and the lower the number, the better the cold resistance.
＜耐熱性＞
テストピースを３号ダンベル型に切断し、１２０℃、１２０時間恒温機で放置して重量変化から揮発分を測定した。揮発分が少ないほど耐熱性が良好である。
<Heat resistance>
The test piece was cut into a No. 3 dumbbell shape and allowed to stand in a constant temperature machine at 120 ° C. for 120 hours, and the volatile matter was measured from the change in weight. The lower the volatile content, the better the heat resistance.
＜ブリード＞
テストピースを４０℃の雰囲気下で７日間保存し、その表面状態を肉眼で観察し、下記基準で評価した。
<Bleed>
The test piece was stored for 7 days in an atmosphere of 40 ° C., and its surface condition was observed with the naked eye and evaluated according to the following criteria.
○：可塑剤のブリードが見られない
△：若干のブリードがある
×：表面のブリードが激しい
○: No plasticizer bleed △: Slight bleed ×: Severe surface bleed
Claims (5)
The member for motor vehicles obtained using the chloroprene-type rubber composition of Claim 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004192915A JP2005068405A (en) | 2003-08-05 | 2004-06-30 | Rubber composition |
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| JP2004192915A JP2005068405A (en) | 2003-08-05 | 2004-06-30 | Rubber composition |
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| JP2005068405A true JP2005068405A (en) | 2005-03-17 |
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| JP2004192915A Pending JP2005068405A (en) | 2003-08-05 | 2004-06-30 | Rubber composition |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008132641A (en) * | 2006-11-28 | 2008-06-12 | Bridgestone Corp | Cylindrical flexible film body |
| US20110315486A1 (en) * | 2009-03-16 | 2011-12-29 | Nok Corporation | Rubber composition |
| KR20140031898A (en) | 2011-05-09 | 2014-03-13 | 덴끼 가가꾸 고교 가부시키가이샤 | Chloroprene rubber and chloroprene rubber composition |
-
2004
- 2004-06-30 JP JP2004192915A patent/JP2005068405A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008132641A (en) * | 2006-11-28 | 2008-06-12 | Bridgestone Corp | Cylindrical flexible film body |
| US20110315486A1 (en) * | 2009-03-16 | 2011-12-29 | Nok Corporation | Rubber composition |
| CN102356127A (en) * | 2009-03-16 | 2012-02-15 | Nok株式会社 | Rubber composition |
| US8623949B2 (en) * | 2009-03-16 | 2014-01-07 | Nok Corporation | Rubber composition |
| CN102356127B (en) * | 2009-03-16 | 2014-07-23 | Nok株式会社 | Rubber composition |
| KR20140031898A (en) | 2011-05-09 | 2014-03-13 | 덴끼 가가꾸 고교 가부시키가이샤 | Chloroprene rubber and chloroprene rubber composition |
| US8993661B2 (en) | 2011-05-09 | 2015-03-31 | Denki Kagaku Kogyo Kabushiki Kaisha | Chloroprene rubber and chloroprene rubber composition |
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