JP2008121020A - Sealing material composition for external wall member excellent in antifouling property - Google Patents
Sealing material composition for external wall member excellent in antifouling property Download PDFInfo
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本発明は、防汚性に優れた外壁部材用シ−リング材に関する。詳しくは窯業系サイディングボ−ド等の無機質多孔性外壁部材用で、長期の耐候性・耐久性を有するとともに、シ−リング材表面及び目地周辺が極めて汚れにくい１成分形シ−リング材組成物に関する。 The present invention relates to a sealing material for an outer wall member having excellent antifouling properties. Specifically, it is for inorganic porous outer wall members such as ceramic siding boards, etc., and has a long-term weather resistance and durability, and is also a one-component sealing material composition that is extremely resistant to contamination of the sealing material surface and joint area. About.
窯業系サイディングボ−ド、セメント或いはモルタルなどの無機質多孔性部材は、建物の外壁等に適した建築部材であり、各々の無機質多孔性部材間の目地部や、無機質多孔性部材と建物の他の部材との間の目地部には、シ−リング材が充填されて、目地の水蜜性（防水性）および気密性（外気との遮断）を維持するとともに、建物の美観を維持している。 Inorganic porous members such as ceramic siding boards, cement, or mortar are building members suitable for the outer wall of buildings, etc., and joints between each inorganic porous member, other inorganic porous members and buildings Sealing material is filled in the joint between the two parts, maintaining the watertightness (waterproofness) and airtightness (blocking from the outside air) of the joint and maintaining the aesthetics of the building. .
この外壁用シ−リング材は、直射日光、風雨、大気汚染等の厳しい自然環境に長期間曝されるため、十分な耐候性・耐久性を要求されている。しかし、いかに耐候性・耐久性に優れたシ−リング材といえども、細菌・塵埃・排気ガス等の大気物質の経年蓄積によってシ−リング材表面及び目地周辺が黒く汚染されるような事態が発生すれば、建物のト−タル的な美観を損ない、シ−リング材の撤去・打ち替えの作業が必要となり、実質的には寿命が短いシ−リング材と何ら変わらないことになる。即ち、名実ともに寿命の長いシ−リング材の性能として、長期の耐候性・耐久性を有するのみならず、シ−リング材の表面及び目地周辺を汚さないことが、外壁用シ−リング材に要求されている。 The outer wall sealing material is required to have sufficient weather resistance and durability because it is exposed to a severe natural environment such as direct sunlight, wind and rain, and air pollution for a long period of time. However, even if the sealing material has excellent weather resistance and durability, the surface of the sealing material and around the joints may be blackly contaminated due to the accumulation of atmospheric substances such as bacteria, dust, and exhaust gas over time. If it occurs, the total aesthetic appearance of the building will be lost, and the work of removing and replacing the sealing material will be required, which will be essentially the same as the sealing material with a short life. In other words, as a performance of a sealing material that has a long service life in both name and reality, not only does it have long-term weather resistance and durability, but it does not contaminate the surface of the sealing material and the periphery of joints. It is requested.
卓越した耐候性・耐久性を有する外壁用シ−リング材として、シリコ−ン系シ−リング材が挙げられるが、ベ−スポリマ−であるシリコ−ンポリマ−の帯電性に起因する目地周辺におけるいわゆる撥水汚染を生じる問題点を有している。特に、サイディングボ−ド、セメント或いはモルタルなどの無機質多孔性部材では、シリコ−ンオイルが目地周辺の部材に浸透して目地周辺を汚してしまい、除去することもできない。 As a sealing material for the outer wall having excellent weather resistance and durability, a silicone-based sealing material can be mentioned, but the so-called around the joint caused by the charging property of the silicone polymer which is a base polymer. It has the problem of causing water-repellent contamination. In particular, in an inorganic porous member such as a siding board, cement, or mortar, the silicone oil permeates the members around the joints and soils the joints and cannot be removed.
故に、シリコ−ン系シ−リング材は無機質多孔性部材には適さず、社団法人 日本建築学会「建築工事標準仕様書ＪＡＳＳ８ 防水工事」などにおいても、その使用が規制されている。この撥水汚染を防ぐ手段として、建材表面（少なくとも目地周辺の表面）を無定形チタニアを被覆した後に焼成することにより得られるアナタ−ゼ型酸化チタン光触媒を含む透明膜で被覆することによりシリコ−ンオイルの移行を防ぐ方法（特開２００１−５５７９９号公報）が開示されているが、建材の焼成設備が必要等、工程的・コスト的に問題がある。さらにこの発明は、シ−リング材自身の改良ではないので、シ−リング材表面におけるシリコ−ンポリマ−の帯電性による塵埃の付着汚染に関しては、何ら解決手段となっていない。 Therefore, the silicone-based sealing material is not suitable for an inorganic porous member, and its use is regulated in the Architectural Institute of Japan “Building Construction Standard Specification JASS8 Waterproof Work”. As a means for preventing this water-repellent contamination, the surface of the building material (at least the surface around the joint) is coated with a transparent film containing an anatase-type titanium oxide photocatalyst obtained by coating amorphous titania and then baking it. However, there is a problem in terms of process and cost, for example, a building material firing facility is required. Further, since the present invention is not an improvement of the sealing material itself, it does not provide any solution for the dust contamination due to the charging property of the silicone polymer on the surface of the sealing material.
シリコ−ン系シ−リング材以外のシ−リング材は、可塑化剤の移行によって目地周辺を汚染することはないが、シ−リング材表面における細菌、塵埃、排気ガスなどによる付着汚染を避けることはできない。これら付着の要因として、シ−リング材の必須成分である可塑化剤が考えられ、可塑化剤が表面に移行し、塵埃、排気ガスなどのバインダ−として働き、汚れを引き起こしているものと考えられる。また、長期の耐候性・耐久性についても、決して十分とはいえないのが実状である。 Sealing materials other than silicone-based sealing materials will not contaminate the joint area due to the migration of the plasticizer, but avoid adhesion contamination due to bacteria, dust, exhaust gas, etc. on the surface of the sealing material It is not possible. As a cause of these adhesions, a plasticizer that is an essential component of the sealing material is considered, and the plasticizer moves to the surface and acts as a binder for dust, exhaust gas, etc. It is done. In fact, long-term weather resistance and durability are not sufficient.
一般建築物の外壁用シ−リング材としては、従来より変成シリコ−ン系シ−リング材が広く使用されている。しかし、変成シリコ−ン系シ−リング材は、撥水汚染を引き起こすことはないものの、長期の耐候性・耐久性に関してはシリコ−ン系シ−リング材と同等とは言い難く、より長期の耐候性・耐久性が求められている。 As a sealing material for an outer wall of a general building, a modified silicone-based sealing material has been widely used conventionally. However, although the modified silicone-based sealing material does not cause water-repellent contamination, it is difficult to say that the long-term weather resistance / durability is the same as that of the silicone-based sealing material. Weather resistance and durability are required.
長期間にわたる安定した耐候性を得るために、変成シリコ−ン系ポリマ−とヒンダ−ドフェノ−ル系あるいはヒンダ−ドアミン系酸化防止剤とを含有する硬化性組成物（特開平４−２８３２５９号公報）、変成シリコ−ン系ポリマ−とベンゾトリアゾ−ル系紫外線吸収剤とを含有する硬化性組成物（特開平５−２８７１８６号公報、特開２００１−２６２１２３号公報）、変成シリコ−ン系ポリマ−に特定のシリコ−ン化合物とポリオキシアルキレン重合体とを併用した変成シリコ−ン系シ−リング材（特開２０００−２０４３４６号公報）等が開示されている。 In order to obtain stable weather resistance over a long period of time, a curable composition containing a modified silicone-based polymer and a hindered phenol-based or hindered amine-based antioxidant (JP-A-4-283259) ), A curable composition containing a modified silicone polymer and a benzotriazole ultraviolet absorber (Japanese Patent Laid-Open Nos. 5-287186 and 2001-262123), and a modified silicone-based polymer. No. 2000-204346 discloses a modified silicone-based sealing material in which a specific silicone compound and a polyoxyalkylene polymer are used in combination.
また、変成シリコ−ン系ポリマ−とアルコキシシリル基含有アクリル系ポリマ−を主成分として無溶剤型アクリル系ポリマ−を配合した湿気硬化性組成物（特開２００１−３５４８４６号公報）が耐候性を改善するとの開示がなされている。 Further, a moisture curable composition (Japanese Patent Laid-Open No. 2001-354846) containing a modified silicone polymer and an alkoxysilyl group-containing acrylic polymer as a main component and a solvent-free acrylic polymer has weather resistance. It is disclosed that it will improve.
しかし、これらはいわゆる耐候性の改善には効果があるものの、前述の可塑化剤に起因するシ−リング材表面における付着汚染を解決する手段とはなり得ず、名実共に長期の耐候性・耐久性を有するシ−リング材とはいえない。
シ−リング材表面における付着汚染を解決する方法として、微粒子アナタ−ス型酸化チタンを配合すると、汚れが著しく低減することが提案されている。表面の汚れの低減度合いは、微粒子アナタ−ス型チタンの配合量に比例し、添加量が多くなれば効果も高くなる。これは、シ−リング材表面に存在する微粒子アナタ−ス型酸化チタンが、光エネルギ−（紫外線）によって励起され、周囲の水や酸素と反応してヒドロキシラジカル（・ＯＨ）を生成し、その活性ラジカルが塵埃、排気ガスなどのバインダ−として働いている可塑化剤を酸化分解しているものと考えられる。 As a method for solving the adhesion contamination on the surface of the sealing material, it has been proposed that the contamination is remarkably reduced when fine particle anatase type titanium oxide is blended. The degree of surface dirt reduction is proportional to the amount of fine particle anatase-type titanium, and the effect increases as the amount added increases. This is because fine anatase-type titanium oxide present on the surface of the sealing material is excited by light energy (ultraviolet rays) and reacts with surrounding water and oxygen to generate hydroxy radicals (.OH) It is considered that the active radical is oxidatively decomposing the plasticizer that works as a binder for dust, exhaust gas and the like.
しかし、光触媒作用による可塑化剤の酸化分解の結果、汚れは低減されるものの、それと同時に、可塑化剤と同様に有機物質であるシ−リング材のベ−スポリマ−も活性ラジカルによる酸化分解を受けるので、シ−リング材自体の耐候性を著しく低下させてしまい、早期劣化につながる。ゆえに、微粒子アナタ−ス型酸化チタンの添加は、極めて耐候性に優れたシ−リング材用ベ−スポリマ−にしか適用できず、その添加量も制限を受ける。 However, as a result of the oxidative degradation of the plasticizer by photocatalysis, dirt is reduced, but at the same time, the base polymer of the sealing material, which is an organic substance as well as the plasticizer, is also oxidatively decomposed by active radicals. Therefore, the weather resistance of the sealing material itself is remarkably lowered, leading to early deterioration. Therefore, the addition of the fine particle anatase-type titanium oxide can be applied only to a base polymer for a sealing material having extremely excellent weather resistance, and the addition amount is also limited.
しかし、耐候性に優れたシ−リング材であるシリコ−ン系シ−リング材に微粒子アナタ−ス型酸化チタンを配合したとしても、シリコ−ンオイルは表面張力が小さく且つ低粘度であるので、シリコ−ンオイルの部材への移行、浸透は急速におこる。そして、その移行したシリコ−ンオイルは、もはや光触媒作用を受けないので、目地周辺に汚れを生じる現象は、依然として避けることのできない問題点として残る。それ故、シリコ−ンオイルが特に移行し易い無機質多孔性部材へシリコ−ン系シ−リング材を適用することは、やはり問題がある。本発明は、名実共に長期間の耐候性・耐久性に優れる無機質多孔性外壁部材用１成分系シ−リング材を提供することを課題とする。 However, even if the fine particle anatase-type titanium oxide is blended with the silicone-based sealing material which is a sealing material with excellent weather resistance, the silicone oil has a low surface tension and a low viscosity. The transfer and penetration of silicone oil into the material occurs rapidly. And since the transferred silicone oil is no longer subjected to photocatalysis, the phenomenon of fouling around the joint remains an inevitable problem. Therefore, it is still problematic to apply a silicone-based sealing material to an inorganic porous member to which silicone oil is particularly likely to migrate. An object of the present invention is to provide a one-component sealing material for an inorganic porous outer wall member that is excellent in both long term weather resistance and durability in both name and reality.
本発明者は、鋭意研究の結果、無機質多孔性外壁部材に適用しうる１成分系湿気硬化型シ−リング材のベ−スポリマ−として、シリコ−ンポリマ−に代えて、変成シリコ−ンポリマ−の主鎖骨格にアクリル変性されたセグメントを一部導入したポリマ−（以下、アクリル変性シリコ−ンポリマ−と称する。）が、長期の耐候性を維持するのに有用であることを見出した。また、アクリル変性シリコ−ンポリマ−をベ−スポリマ−として、ルチル型酸化チタンを配合することによって、シ−リング材表面の経年汚染が少なく、且つ従来のシリコ−ン系シ−リング材に匹敵する長期間の耐候性・耐久性に優れた無機質多孔性外壁部材用シ−リング材として実用化可能な配合組成を見出し、本発明を完成するに至った。 As a result of diligent research, the present inventor, as a base polymer of a one-component moisture-curing sealing material that can be applied to an inorganic porous outer wall member, replaces a silicone polymer with a modified silicone polymer. It has been found that a polymer in which an acrylic-modified segment is partially introduced into the main chain skeleton (hereinafter referred to as an acrylic-modified silicone polymer) is useful for maintaining long-term weather resistance. In addition, by blending rutile type titanium oxide with an acrylic modified silicone polymer as the base polymer, there is little aging contamination on the surface of the sealing material, and it is comparable to conventional silicone-based sealing materials. A compounding composition that can be put to practical use as a sealing material for an inorganic porous outer wall member excellent in long-term weather resistance and durability has been found, and the present invention has been completed.
本発明は、アクリル変性シリコ−ンポリマ−をベ−スポリマ−とし、また、揺変剤、老化防止剤、脱水剤、硬化触媒等、従来からの変成シリコ−ン材用配合剤の他に、新たにルチル型酸化チタン、又は、ルチル型酸化チタン及び微粒子アナタース型酸化チタンの組み合わせを添加した組成物からなる１成分系湿気硬化型シ−リング材であり、（１）長期にわたってシ−リング材が汚れない。（２）従来のシリコ−ン系シ−リング材に劣らぬ耐候性・耐久性を有する。（３）無溶剤型で施工時に溶剤が浮遊せず安全に作業を行なうことができる等の特徴を見出し、実用化可能な配合組成としたものである。 In the present invention, an acrylic-modified silicone polymer is used as a base polymer, and in addition to conventional compounding agents for modified silicone materials such as thixotropic agents, anti-aging agents, dehydrating agents, and curing catalysts. It is a one-component moisture-curing sealing material comprising a composition in which rutile type titanium oxide or a combination of rutile type titanium oxide and fine particle anatase type titanium oxide is added. (1) Not dirty. (2) It has weather resistance and durability comparable to conventional silicone sealing materials. (3) It is a solvent-free type and has a characteristic that it can be safely operated without causing the solvent to float at the time of construction.
本発明に係るアクリル変性シリコ−ンポリマ−は、変成シリコ−ンポリマ−の主鎖骨格にアクリル変成されたセグメントを一部導入したポリマ−であって、特許第２６３４６２９号、特開平１−２７２６５４号その他に開示されており、平均分子量で２０００〜３００００のものが好ましい。本願において使用できる商品の一例として、鐘淵化学工業株式会社製「カネカＭＳポリマ− Ｓ９４３、或いは、カネカＭＳポリマ− Ｓ９４３とカネカＭＳポリマ− Ｓ９０３の混合物」が挙げられる。 The acrylic-modified silicone polymer according to the present invention is a polymer in which a part of the acrylic-modified segment is introduced into the main chain skeleton of the modified silicone polymer. Japanese Patent No. 2634629, JP-A-1-272654 and others The average molecular weight is preferably 2000 to 30000. As an example of a product that can be used in the present application, “Kaneka MS Polymer S943 or a mixture of Kaneka MS Polymer S943 and Kaneka MS Polymer S903” manufactured by Kaneka Chemical Industry Co., Ltd. may be mentioned.
微粒子アナタ−ス型酸化チタンは、粒径（平均粒子径）５〜１００ｎｍであることが望ましい。粒径が小さすぎると組成物の粘度が高くなり、作業性に支障を来す。反対に、粒径が大きすぎると、光触媒作用が低下すると共に、施工後の化粧性にも支障を来すので、好ましくない。より好ましい粒径は、２０〜５０ｎｍである。 The fine particle anatase-type titanium oxide preferably has a particle size (average particle size) of 5 to 100 nm. If the particle size is too small, the viscosity of the composition becomes high, which hinders workability. On the other hand, if the particle size is too large, the photocatalytic action is lowered, and the cosmetic properties after the construction are hindered. A more preferable particle size is 20 to 50 nm.
ベ−スポリマ−１００重量部に対する配合量としては、２０重量部以上でシ−リング材表面の汚れの低減に対する効果が得られる。しかし、配合量が多くなると、ベ−スポリマ−の酸化分解に影響を与えて逆に耐候性・耐久性を低下させてしまうので、配合量は、２０〜８０重合部が望ましく、２０〜５０重量部がより好ましい。 The blending amount with respect to 100 parts by weight of the base polymer is 20 parts by weight or more, and the effect of reducing the dirt on the surface of the sealing material is obtained. However, if the blending amount increases, the oxidative decomposition of the base polymer is affected, and conversely the weather resistance and durability are lowered. Therefore, the blending amount is desirably 20 to 80 polymer parts, and 20 to 50 weights. Part is more preferred.
その他、揺変剤、老化防止剤、脱水剤、硬化触媒等、従来からの変成シリコ−ン系シ−リング材の配合に使用する材料を適宜選択して配合することにより、本組成物が得られる。なお、本願により得られる組成物を無機質多孔性外壁部材用以外に使用することは、無論可能である。その場合、要求される製品の性状、物性及び用途に応じて、微粒子アナタ−ス型酸化チタンの粒径や配合量が適宜、選択、決定される。 In addition, the composition can be obtained by appropriately selecting and blending materials used for blending conventional modified silicone-based sealing materials such as thixotropic agents, anti-aging agents, dehydrating agents, and curing catalysts. It is done. In addition, it cannot be overemphasized that the composition obtained by this application can be used other than for inorganic porous outer wall members. In that case, the particle size and blending amount of the fine particle anatase-type titanium oxide are appropriately selected and determined according to the required properties, physical properties and applications of the product.
以下に、実施例並びに比較例をもって、説明する。実施例１〜４、並びに比較例１〜４、表１に示す各配合例に基づき、１成分形湿気硬化型シ−リング材を作成した。なお、各配合実施例の値は、全て重量部である。 Below, it demonstrates with an Example and a comparative example. Based on Examples 1 to 4 and Comparative Examples 1 to 4 and formulation examples shown in Table 1, one-component moisture-curing sealing materials were prepared. In addition, all the values of each combination example are parts by weight.
混合処方は、以下のとおりである。
１）配合剤Ｎｏ．１に対して、配合剤Ｎｏ．２〜７を添加し、プラネタリ−ミキサ−で配合物全体の含有水分量が５００ｐｐｍ以下になるまで脱水加熱真空攪拌した後、４０℃以下まで脱水冷却真空攪拌を行なう。
２）その後、配合剤Ｎｏ．８〜１１を添加し、真空冷却攪拌して１成分形湿気硬化型シ−リング材を得た。
The mixed recipe is as follows.
1) Formulation No. 1 to No. 1 2 to 7 are added, and the mixture is dehydrated and heated under vacuum with a planetary mixer until the water content in the entire formulation is 500 ppm or lower, and then dehydrated and cooled under vacuum to 40 ° C. or lower.
2) After that, Compounding No. 8 to 11 were added and stirred under vacuum cooling to obtain a one-component moisture-curing sealing material.
表１において、
アクリル変性シリコ−ンポリマ−：カネカＭＳポリマ−Ｓ９４３：鐘淵化学工業株式会社製
変成シリコ−ンポリマ−：カネカＭＳポリマ−Ｓ２０３：鐘淵化学工業株式会社製
ルチル型酸化チタン：ＪＲ−６０２：テイカ株式会社製
微粒子アナタ−ス型酸化チタン：ＡＭＴ−６００：テイカ株式会社製
揺変剤：ディスパロン＃６５００：楠木化成工業株式会社製
脱水剤：ＫＢＭ−１００３：信越化学工業株式会社製：
接着付与剤：ＫＢＭ−６０３：信越化学工業株式会社製：
を使用した。
In Table 1,
Acrylic modified silicone polymer: Kaneka MS polymer S943: Kaneka Chemical Co., Ltd. modified silicone polymer: Kaneka MS polymer S203: Kaneka Chemical Co., Ltd. rutile titanium oxide: JR-602: Taker stock Company fine particle anatase type titanium oxide: AMT-600: Teika Co., Ltd. thixotropic agent: Disparon # 6500: Kashiwagi Kasei Kogyo Co., Ltd. dehydrating agent: KBM-1003: Shin-Etsu Chemical Co., Ltd.
Adhesion imparting agent: KBM-603: Shin-Etsu Chemical Co., Ltd.
It was used.
評価試験 Evaluation test
１．屋外暴露試験
（屋外暴露評価試験体の作製）
各実施例及び各比較例で得たシ−リング材、及び参考試料としてシリコ−ン系シ−リング材〔商品名：セカイチョ−シ−ラ−Ｓ１：世界長株式会社製〕を、幅２０×深さ１５×高さ１００ｍｍのアルミチャンネルに厚さ５ｍｍのバッカ−を目地底に装填し、シ−リング材を充填し金属へらにて表面を均一に馴らして仕上げて試験体を得た。
（屋外暴露試験）
高速道路に隣接し車の交通量が多く、汚染に対して厳しい環境下において、南面傾斜４５°暴露台を用いて屋外暴露を３年間行った。
1. Outdoor exposure test (preparation of outdoor exposure test specimen)
The sealing material obtained in each Example and each Comparative Example, and a silicone-based sealing material [trade name: Sekaicho Sealer S1: manufactured by World Head Co., Ltd.] as a reference sample, width 20 × An aluminum channel having a depth of 15 × height of 100 mm was loaded with a backer having a thickness of 5 mm on the joint base, filled with a sealing material, and the surface was evenly conditioned with a metal spatula to obtain a test specimen.
(Outdoor exposure test)
Adjacent to the expressway, there was a lot of car traffic, and the outdoor exposure was conducted for 3 years using a 45 ° exposure table on the south slope in a severe environment against pollution.
（１）シ−リング材表面の汚れ評価方法
１）目視による評価：
暴露３年後のシ−リング材表面の黒く蓄積された汚れを観察し、表２のように評点をつけた。なお、基準となる試料は、比較例１とした。
(1) Method for evaluating dirt on sealing material surface 1) Visual evaluation:
The dirt accumulated on the surface of the sealing material 3 years after the exposure was observed and scored as shown in Table 2. The reference sample was Comparative Example 1.
（２）色差計による評価：
暴露３年後のシ−リング材表面の黒く蓄積された汚れを色彩色差計ＣＲ−３００型（ミノルタ株式会社製）を用いて明度（Ｌ１）を測定し、暴露開始前に予め測定しておいた明度（Ｌ０）との明度差（ΔＬ）を下式：
ΔＬ＝Ｌ１−Ｌ０
により算出した。なお、明度は、明暗の度合いを示す指数であり、０（黒）から
１００（白）の範囲で示される。
(2) Evaluation by color difference meter:
Measure the lightness (L 1 ) of the dirt accumulated on the surface of the sealing material 3 years after exposure using a color difference meter CR-300 (manufactured by Minolta Co., Ltd.). The lightness difference (ΔL) from the lightness (L 0 ) is expressed by the following formula:
ΔL = L 1 −L 0
Calculated by The lightness is an index indicating the degree of lightness and darkness, and is indicated in a range from 0 (black) to 100 (white).
（３）シ−リング材の表面耐候性評価方法
暴露３年後のシ−リング材表面を高精細デジタルマイクロスコ−プＶＨ−６３００（株式会社キ−エンス製）を用い、１８０倍に拡大して表面の劣化進行度合いを観察し、表３の様に評点をつけた。なお、評点の基礎となるわれの程度については、「ＡＬＣパネル外壁の補修・改修技術」（発行：財団法人 日本建築センタ−他、監修：建設大臣官房技術調査室、１９９２年９月１５日発行）第３４頁の記載に準拠した。
(3) Surface weathering evaluation method of sealing material The surface of the sealing material after 3 years of exposure was enlarged 180 times using a high-definition digital microscope VH-6300 (manufactured by Keyence Corporation). Then, the degree of progress of surface deterioration was observed, and a rating was given as shown in Table 3. As for the degree of mystery, which is the basis of the rating, “ALC panel exterior wall repair / renovation technology” (published by: Nippon Building Center, etc., supervised by: Minister of Construction, Secretariat Technology Research Office, published on September 15, 1992) ) According to the description on page 34.
２．促進耐候性試験
（試験体の作製）
各実施例及び各比較例で得たシ−リング材を、ステンレス板上に、縦５０×横５０×厚さ５ｍｍに塗布し、２３℃×１４日養生し試験体を得た。
（促進耐候性試験）
試験体を、サンシャインウエザ−メ−タ−Ｓ３００型（スガ試験機株式会社製）を用いて促進耐候性試験を行った。照射条件は槽内温度４３℃とし、また、降雨時間は、照射１２０分中の１８分である。
2. Accelerated weathering test (preparation of specimen)
The sealing material obtained in each example and each comparative example was applied to a stainless steel plate in a length of 50 × width of 50 × thickness of 5 mm and cured at 23 ° C. for 14 days to obtain a test specimen.
(Accelerated weather resistance test)
The specimen was subjected to an accelerated weather resistance test using a sunshine weather meter S300 type (manufactured by Suga Test Instruments Co., Ltd.). Irradiation conditions are a tank internal temperature of 43 ° C., and the raining time is 18 minutes in 120 minutes of irradiation.
（１）シ−リング材の表面耐候性評価
所定照射時間経過後のシ−リング材表面を、高精細デジタルマイクロスコ−プＶＨ−６３００（株式会社キ−エンス製）を用い、１８０倍に拡大して、劣化進行度合いを観察し、評点をつけた。評価方法は、屋外暴露試験におけるシ−リング材の表面耐候性評価方法と同じである。
(1) Evaluation of surface weathering of sealing material The surface of the sealing material after a predetermined irradiation time has been enlarged 180 times using a high-definition digital microscope VH-6300 (manufactured by Keyence Corporation). Then, the degree of deterioration was observed and given a score. The evaluation method is the same as the surface weather resistance evaluation method of the sealing material in the outdoor exposure test.
評価試験結果並びに総合評価を、表４に示す。 Table 4 shows the evaluation test results and the overall evaluation.
表４の結果により、従来の変成シリコ−ン系シ−リング材は、促進暴露試験において、２５００時間（屋外暴露約１０年相当）以降、急激に表面耐候性が低下してくるが、アクリル変性シリコ−ンポリマ−を採用した本願に係る組成物では、４０００時間以上においても、表面に異状を発することなく、シリコ−ン系シ−リング材（表４中の「シリコーン」）と比較しても遜色ない耐候性を発揮している。 According to the results of Table 4, the conventional modified silicone-based sealing material has a surface weatherability that decreases rapidly after 2500 hours (equivalent to about 10 years of outdoor exposure) in the accelerated exposure test. In the composition according to the present invention that employs a silicone polymer, even if it is 4000 hours or longer, it does not cause any abnormalities on the surface, and compared with a silicone-based sealing material (“silicone” in Table 4). Demonstrates inferior weather resistance.
一方、変成シリコ−ン系シ−リング材は、シ−リング材表面における汚れの防止において、シリコ−ン系シ−リング材を遙に上回っており、アクリル変性シリコ−ンポリマ−を採用した本願に係る組成物もシリコ−ン系シ−リング材と同等の性能を発揮している。 On the other hand, the modified silicone-based sealing material is far superior to the silicone-based sealing material in the prevention of dirt on the surface of the sealing material, and the present application adopts an acrylic-modified silicone polymer. Such a composition also exhibits the same performance as that of a silicone-based sealing material.
本発明に係るアクリル変性シリコ−ンポリマ−を採用したシ−リング材組成物によれば、表面耐候性においてはシリコ−ン系シ−リング材に遜色ない耐候性を発揮し、かつ長期間の屋外暴露においても、シ−リング材表面における汚れの低減、抑制を図ることができる。 According to the sealing material composition adopting the acrylic-modified silicone polymer according to the present invention, the surface weather resistance exhibits weather resistance comparable to that of the silicone-based sealing material, and is outdoors for a long period of time. Even during exposure, it is possible to reduce or suppress dirt on the surface of the sealing material.
また、実施例２および３で得られたシ−リング材組成物を用いて、ＪＩＳ−Ａ−５７５８−１９９７（建築用シ−リング材）に準拠したシ−リング材の性能評価を行ったところ、Ｆ−２５ＬＭに相当する物性であり、建築用シ−リング材として必要かつ十分な物性を充足している。このように、本発明に係るアクリル変性シリコ−ンポリマ−を採用したシ−リング材組成物は、無機質多孔性外壁部材用シ−リング材組成物として優れた効果を発揮する。 Moreover, when the performance evaluation of the sealing material based on JIS-A-5758-1997 (building sealing material) was performed using the sealing material composition obtained in Example 2 and 3. It is a physical property corresponding to F-25LM, and satisfies the necessary and sufficient physical properties as a sealing material for construction. Thus, the sealing material composition which employ | adopted the acrylic modified silicone polymer which concerns on this invention exhibits the outstanding effect as a sealing material composition for inorganic porous outer wall members.
Claims (3)
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| JP2007327904A JP2008121020A (en) | 2007-12-19 | 2007-12-19 | Sealing material composition for external wall member excellent in antifouling property |
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| JP2007327904A JP2008121020A (en) | 2007-12-19 | 2007-12-19 | Sealing material composition for external wall member excellent in antifouling property |
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|---|---|---|---|---|
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| JPH01271476A (en) * | 1988-04-21 | 1989-10-30 | Sanyo Chem Ind Ltd | Moisture-curable sealant |
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