JP3871101B2 - Resin composition for building base material and building base material using the same - Google Patents

Resin composition for building base material and building base material using the same Download PDF

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Publication number
JP3871101B2
JP3871101B2 JP28802499A JP28802499A JP3871101B2 JP 3871101 B2 JP3871101 B2 JP 3871101B2 JP 28802499 A JP28802499 A JP 28802499A JP 28802499 A JP28802499 A JP 28802499A JP 3871101 B2 JP3871101 B2 JP 3871101B2
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Prior art keywords
base material
wax
resin composition
emulsion
building base
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JP2001106963A (en
Inventor
功 河合
真一 吉岡
一郎 三田
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DIC Corp
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Dainippon Ink and Chemicals Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、建造物の壁下地材や床下地材および屋根下地材といった建築下地材用樹脂組成物及びそれを使用した建築下地材に関する。詳しくは、特定の組成の建築下地材用樹脂組成物を基材の表面に塗布することにより得られる、長期にわたる耐水性と耐スリップ性に優れた建築下地材に関する。
【0002】
【従来の技術】
従来から住宅の壁、床、屋根は合板やパーティクルボード等の木質板で形成された建築下地材の上に壁材、床材、屋根材を張ることにより仕上げられている。
【0003】
しかし、建築下地材は、雨に曝されると合板が吸水し、施工後のソリ発生の原因となる。特に施工現場での作業においては、外装仕上げまでの間に雨や雪に曝される機会が多く、とりわけ近年普及している2×4工法は床を施工した後に屋根を完成させる工法であるため、屋根下地材のみならず、壁材や床下地材においても降雨、降雪対策が重要な問題となっている。
【0004】
このため建築現場では下地材を雨から保護するために養生シートをかぶせるという手間をかけており、降雨の間、工事を中断せざるを得ないのが現状である。また、屋根下地材においては降雨降雪対策に加えて、施工現場において屋根の勾配のためにその表面が滑り易く、作業に危険が伴うという問題も抱えている。これらの問題を解決するために特開平4−169647号公報や特開平3−87250号公報ではスリップ防止の目的で骨材や充填剤を含有した樹脂皮膜層を基材の表面に形成させている。
【0005】
これらの方法では皮膜層が含有する骨材や充填剤のために不均質となり、十分な耐水性が得られない欠点を有しており、これに対して特開平7−179807号公報によってスチレン−ブタジエン共重合体を主とした樹脂組成物を塗布した床下地材、屋根下地材が提案されている。
【0006】
しかし、このような樹脂組成物からなる皮膜は、太陽光に含まれる紫外線やオゾンなどラジカルを誘発させる外因によって劣化しやすい欠点を有している。建築時の不可抗力による工事中断などによって長期にわたり屋外の直射日光や降雨に曝される条件下での建築下地材の保護には難点を残している。
【0007】
【発明が解決しようとする課題】
本発明の目的は、合板の表面に撥水性を有する耐水性の樹脂皮膜を形成させることの出来る樹脂組成物、雨に曝されても、南洋材合板やより水分吸収しやすい針葉樹合板の水分吸収を防止し、施工後の養生や下地材のソリ等の問題発生を無くすと共に、単に雨を拭き取るだけで直ちに次の作業に移ることの出来る建築下地材用合板に使用する下地材用樹脂組成物及び建築下地材を提供することによって工事の期間を短縮することにある。
【0008】
【課題を解決するための手段】
本発明者等は、上記の課題を解決すべく鋭意研究を重ねた結果、本発明を完成するに至った。
【0009】
即ち、本発明は、ワックス系エマルジョン(C)をシードとし、共役不飽和基を有さないラジカル重合性不飽和単量体(a)及びエチレン性不飽和カルボン酸(b)からなる組成物を共重合して得られるワックス変性エマルジョン(A)を有効成分とすることを特徴とする建築下地材用樹脂組成物、さらには(A)ワックス系エマルジョン(C)をシードとし、共役不飽和基を有しないラジカル重合性不飽和単量体(a)及びエチレン性不飽和カルボン酸(b)からなる組成物を共重合して得られるワックス変性エマルジョン、(B)共役不飽和基を有さないラジカル重合性不飽和単量体(a)及びエチレン性不飽和カルボン酸(b)からなる共重合体エマルジョン、(C)ワックス系エマルジョン、(A)(B)(C)いずれか2種以上を有効成分とすることを特徴とする建築下地材用樹脂組成物、好ましくはワックス系エマルジョン(C)が、ワックスを分散剤で水中に分散せしめたものであること、基材にこれら樹脂組成物を塗布乾燥してなる建築下地材を提供する。
【0010】
【発明の実施の形態】
本発明のワックス変性エマルジョン(A)は、好ましくは、ワックスを分散剤で水中に分散せしめたワックス系エマルジョン(C)を固形分換算で好ましくは1〜50重量%、共役不飽和基を有さないラジカル重合性不飽和単量体(a)を好ましくは45〜98.5重量%、及び共役不飽和基を有さないラジカル重合性不飽和単量体(c)好ましくは0.5〜5重量%を乳化重合することにより得られる。
【0011】
本発明の共重合体エマルジョン(B)は、好ましくは、共役不飽和基を有さないラジカル重合性不飽和単量体(a)好ましくは95〜99.5重量%とエチレン性不飽和カルボン酸(b)好ましくは0.5〜5重量%を乳化重合することにより得られる。
【0012】
本発明で使用する共役不飽和基を有さないラジカル重合性不飽和単量体(a)は、特に限定されるものでなく従来ラジカル重合に用いられるものであれば特に問題なく使用できる。
【0013】
(a)成分を例示すると、アクリル酸メチル、アクリル酸エチル、アクリル酸ブチル、アクリル酸2エチルヘキシル等のアクリル酸エステル類;メタクリル酸メチル、メタクリル酸エチル、メタクリル酸ブチル、メタクリル酸2エチルヘキシル、メタクリル酸シクロヘキシル等のメタクリル酸エステル類;スチレン、ビニルトルエン等の芳香族ビニル化合物;マレイン酸、フマル酸、イタコン酸などのエチレン性不飽和カルボン酸の各エステル;酢酸ビニル、プロピオン酸ビニル、第3級カルボン酸ビニルなどのビニルエステル類;ビニルピロリドンの如き複素環式ビニル化合物;塩化ビニル、アクリロニトリル、ビニルエーテル、ビニルケトン、ビニルアミド等;塩化ビニリデン、フッ化ビニリデン等ハロゲン化ビニリデン類;エチレン、プロピレン等のα−オレフイン類;ジアリルフタレート、ジビニルベンゼン、アリルアクリレート、トリメチロールプロパントリメタクリレートの如き1分子中に2個以上の不飽和記を有する単量体;γ−メタクリロキシプロピルトリメトキシシラン、ビニルトリメチルシラン、ビニルトリエトキシシラン等のビニルシラン類などが挙げられる。勿論、これらに限定されるものでなく、又これらを併用することも可能である。
【0014】
本発明で使用する共役不飽和基を有さないラジカル重合性不飽和単量体(a)を用いずにブタジエンに代表される共役不飽和基を有するラジカル重合性不飽和単量体を用いた場合は、重合後に得られる樹脂中に不飽和結合が残存し、耐候性を損ねる原因となるため共役不飽和基を有するラジカル重合性不飽和単量体は好ましくない。
【0015】
共役不飽和基を有しないラジカル重合性不飽和単量体(a)は、2種以上併用するものであってもかまわない。
【0016】
エチレン性不飽和カルボン酸(b)は、特に限定されるものでなく従来ラジカル重合に用いられるものであれば特に問題なく使用できる。
【0017】
(b)成分を例示すると、例えば、はアクリル酸、メタクリル酸、フマル酸、イタコン酸、クロトン酸、フマル酸モノエステル、イタコン酸モノエステル、無水マレイン酸、無水イタコン酸、2−メタクリロイルプロピオン酸、2−メタクリロイルオキシエチルフタル酸などが挙げられる。勿論、これらに限定されるものでなく、又これらを併用することも可能である。
【0018】
本発明のワックス系エマルジョン(C)とは、液状ワックス、必要により固形ワックスを溶融し、界面活性剤などの分散剤を用いて水中に分散せしめたものを指称するものである。
【0019】
ここで言うワックスとは、例えば、パラフィンワックス、蜜蝋、牛脂、アミドワックス、などのワックス類で、これらを必要により溶融し、界面活性剤などを用いて水中に分散せしめることで製造されたものが挙げられる。
【0020】
ワックス系エマルジョン(C)は、ワックス変性エマルジョン(A)のシードと同一であっても異なっていてもかまわない。
【0021】
ワックス系エマルジョン(C)の使用量は、建築下地材用樹脂組成物の固形分中におけるワックスの固形分として50重量%以下が好ましく、3〜35重量%が更に好ましい。
【0022】
本発明で使用する乳化剤は、乳化重合を安定に行い、重合終了後におけるエマルジョン中のポリマー粒子の分散状態を安定化するために必須の成分であって、陰イオン性、非イオン性の界面活性剤が挙げられる。これらを単独あるいは併用の形で使用することができる。
【0023】
陰イオン性界面活性剤としては、例えばオレイン酸カリウム、オレイン酸ナトリウム等の脂肪酸塩、高級脂肪族アルコールの硫酸エステル塩、アルキルジフェニルエーテルジスルホン酸塩、等が挙げられ、非イオン界面活性剤としては、例えばポリオキシエチレンラウリルエーテル、ポリオキシエチレンノニルフェニルエーテル、ポリオキシエチレンモノラウリルエステルおよびポリオキシエチレンソルビタンモノステアレート等が挙げられる。また、p−スチレンスルホン酸ナトリウム等の不飽和基を有する反応性界面活性剤も挙げられる。
【0024】
これらの乳化剤は、共役不飽和基を有さないラジカル重合性不飽和単量体(a)とエチレン性不飽和カルボン酸(b)との合計100重量部に対し、好ましくは0.5〜10重量部の範囲で使用される。
【0025】
本発明で使用されるワックス変性エマルジョン(A)は、シード重合法により調製される。即ち、ワックス系エマルジョン(C)を入れた攪拌機付きフラスコ中で上記の(a)と(b)からなる単量体混合物を乳化剤によって水中に乳化分散させ、好ましくは過硫酸カリウム等の過酸化物系触媒またはこれら過酸化物系触媒と還元剤を組み合わせたレドックス系触媒を重合開始剤として、好ましくは0〜100℃で乳化重合を行い製造することができる。また、必要により重合終了後にストリッピングによる未反応モノマーの除去、濃縮、pH調整の各工程を経て得ることもできる。
【0026】
本発明で使用される共重合体エマルジョン(B)は、通常の乳化重合法により調製される。即ち、攪拌機付きフラスコ中で上記の(a)と(b)からなる単量体混合物を乳化剤によって水中に乳化分散させ、好ましくは過硫酸カリウム等の過酸化物系触媒またはこれら過酸化物系触媒と還元剤を組み合わせたレドックス系触媒を重合開始剤として、好ましくは0〜100℃で乳化重合を行い得ることができる。また、必要により重合終了後にストリッピングによる未反応モノマーの除去、濃縮、pH調整の各工程を経て得ることもできる。
【0027】
本発明の建築下地材用樹脂組成物を塗布する為の調製にあたっては、必要に応じて着色剤、顔料、充填材、消泡剤、防腐剤あるいは適正な塗布作業性を得るための増粘剤、レベリング剤等を添加することはなんら差し支えない。
【0028】
本発明の耐水性およびスリップ防止性を有する建築下地材は、前述の樹脂組成物を基材の表面に塗布・乾燥して得られる。本発明の建築下地基材としては、合板、パーティクルボード、木板等の木質基材が挙げられる。
【0029】
塗布方法としては、例えば、ロールコーター、ナイフコーター、スプレー等の塗布機を用い、あるいは刷毛で木質基材表面を塗布する。その後、自然乾燥あるいは熱風乾燥機、遠赤外線乾燥機、高周波乾燥機等により強制乾燥して塗布木質基材を得る。その塗布量は、好ましくは30〜100g/m2である。
【0030】
また建築現場などの建築下地材を使用している現場で、刷毛、ローラー刷毛、スプレー等用いて建築下地材表面に塗布した後、自然乾燥しても構わない。
【0031】
【実施例】
次に実施例によって本発明を更に具体的に説明する。なお、以下の実施例中で「部」とあるのは「重量部」を云う。
【0032】
(合成例)(A)、(B)の合成
エマルジョンE−1〜E−4として表1に記載する組成を窒素置換した攪拌機付フラスコに仕込み、70℃で重合率が98%以上となるまで重合を行い、次いでアンモニア水でpHを8.0に調整し、固形分50%のエマルジョンを調製した。
【0033】
ラテックスL−1として表1に記載する組成を窒素置換した攪拌機付オートクレーブに仕込み、70℃で重合率が98%以上となるまで重合を行い、次いでアンモニア水でpHを8.0に調整・脱水濃縮し、固形分50%のラテックスを調製した。
【0034】
【表1】

Figure 0003871101
【0035】
【表2】
塗装剤の調合
Figure 0003871101
【0036】
<試験方法及び評価基準>
耐水性試験(1);針葉樹構造用合板(材種:ダグラスファー)に樹脂組成物をロールコータ−(ダブルコート)を用いて60g/m2塗布し、熱風循環式乾燥機にて55℃で40分乾燥して塗装合板試片を作成した。次いで塗装合板試片と無処理合板それぞれの表面に内径18mm、高さ120mmの透明なアクリル樹脂製パイプを水が漏れないように貼り付け、その中に水を25cc(水位10cm)を入れ、透水量の経日変化を測定した。
【0037】
耐水性試験(2);針葉樹構造用合板(材種:ダグラスファー)に樹脂組成物を上記と同様に塗装した塗装合板と無処理合板を塗装面が上面となるような底板とし、角材を側板として内寸法が縦3,600mm、3,600mm、深さ100mmの箱をそれぞれ作成し、板と板の継ぎ目を湿気硬化型ウレタン接着剤でシールした。この箱に60mmの深さになる迄水を入れて室温で5日間静置した。次いで水を抜き取り、直後と2カ月間自然乾燥後の合板の状態を観察した。
【0038】
スリップ防止性試験;耐水性試験と同様の方法で作成した10cm×20cmの塗装合板試片および無処理合板試片を傾斜板に取付け、その表面に低面にゴムシートを取り付けた7cm×9cm、1Kgのおもりを置き、JIS P−8147(紙及び板紙の摩擦係数試験方法)の傾斜法に準拠して滑り出し開始の角度を測定した。
【0039】
耐候性試験:直射日光が当たる屋外に塗面を上にして3ヶ月間放置し、耐水性試験(1)と耐水性試験(2)、スリップ防止性試験、表面の劣化状態を観察した。
【0040】
耐ブロッキング性試験;耐水性試験と同様の方法で作成した長さ20cm、幅10cmの塗装合板試片をそれぞれ30、40℃の温度に調整された熱風循環乾燥機中で1時間静置後取り出して、直ちに3枚重ねて0.3〜1.0Kg/cm2の圧力、温度22℃、湿度60%の条件で24時間プレスした後、合板同士を剥した時の状態を観察した。
【0041】
〔耐ブロッキング性試験の判定基準〕
全く抵抗無く剥せる----◎
殆ど抵抗無く剥せる----○
剥す時に抵抗あり ----△
塗膜と合板が粘着している----×
【0042】
【表3】
評価結果
実施例
Figure 0003871101
【0043】
【表4】
比較例
Figure 0003871101
【0044】
【発明の効果】
本発明の樹脂組成物は、建築下地材に長期にわたる耐水性と耐スリップ性を付与でき、優れた壁下地材や床下地材および屋根下地材といった建築下地材を与えるものである。特に、下地材を施工後、仕上げ迄の間の降雨に対して従来のシート養生の必要が無いため工期の短縮を図ることができる。
【0045】
他方、近年木材資源保護の見地から、南洋材の確保が困難になっている。このため、針葉樹の有効活用が今後の重要な課題となっているが、針葉樹合板は吸水による変形が大きいという本質的な問題がある。しかし、本発明によって針葉樹合板の下地材としての利用が促進される。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resin composition for a building base material such as a wall base material, a floor base material, and a roof base material of a building, and a building base material using the same. More specifically, the present invention relates to a building foundation material excellent in water resistance and slip resistance over a long period of time, which is obtained by applying a resin composition for a building foundation material having a specific composition to the surface of a substrate.
[0002]
[Prior art]
Conventionally, the walls, floors, and roofs of houses have been finished by stretching wall materials, floor materials, and roof materials on building base materials made of wood boards such as plywood and particle boards.
[0003]
However, if the building base material is exposed to rain, the plywood absorbs water and causes warping after construction. In particular, when working on the construction site, there are many opportunities to be exposed to rain and snow before finishing the exterior, and in particular, the 2 × 4 method, which has become popular in recent years, is a method that completes the roof after constructing the floor. Measures against rain and snow are an important issue not only for roof base materials but also for wall materials and floor base materials.
[0004]
For this reason, the construction site takes time and effort to cover the base material from the rain, and the current situation is that the construction must be interrupted during the rain. Further, in addition to measures against rain and snow, the roof base material has a problem that the surface is slippery due to the slope of the roof at the construction site, and the work is dangerous. In order to solve these problems, JP-A-4-169647 and JP-A-3-87250 form a resin film layer containing an aggregate or a filler on the surface of the base material for the purpose of preventing slipping. .
[0005]
In these methods, the aggregate and filler contained in the coating layer are inhomogeneous, and there is a disadvantage that sufficient water resistance cannot be obtained. On the other hand, according to JP-A-7-179807, styrene- A floor base material and a roof base material to which a resin composition mainly composed of a butadiene copolymer is applied have been proposed.
[0006]
However, a film made of such a resin composition has a defect that it tends to deteriorate due to external factors that induce radicals such as ultraviolet rays and ozone contained in sunlight. It remains difficult to protect the building foundation under conditions exposed to direct sunlight and rain for a long time due to construction interruptions due to force majeure during construction.
[0007]
[Problems to be solved by the invention]
The object of the present invention is to form a water-resistant resin film having water repellency on the surface of plywood, the water absorption of southern plywood and softwood plywood that can absorb water more easily even when exposed to rain. Resin composition for base material used for plywood for building base material that can prevent the occurrence of curing and warping of the base material after construction, and can immediately move to the next work simply by wiping rain And, it is to shorten the construction period by providing building foundation materials.
[0008]
[Means for Solving the Problems]
As a result of intensive studies to solve the above problems, the present inventors have completed the present invention.
[0009]
That is, the present invention provides a composition comprising a radically polymerizable unsaturated monomer (a) having no conjugated unsaturated group and an ethylenically unsaturated carboxylic acid (b) using the wax-based emulsion (C) as a seed. A resin composition for a building base material characterized by comprising a wax-modified emulsion (A) obtained by copolymerization as an active ingredient, and (A) a wax-based emulsion (C) as a seed, and a conjugated unsaturated group. A wax-modified emulsion obtained by copolymerizing a composition comprising a radically polymerizable unsaturated monomer (a) and an ethylenically unsaturated carboxylic acid (b), and (B) a radical having no conjugated unsaturated group A copolymer emulsion consisting of a polymerizable unsaturated monomer (a) and an ethylenically unsaturated carboxylic acid (b), (C) a wax-based emulsion, and (A), (B) and (C) are effective. Component A resin composition for a building base material, preferably a wax-based emulsion (C), wherein a wax is dispersed in water with a dispersant, and the resin composition is applied to a substrate and dried. Provide architectural foundation material.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The wax-modified emulsion (A) of the present invention is preferably a wax-based emulsion (C) obtained by dispersing wax in water with a dispersant, preferably 1 to 50% by weight in terms of solid content, and has a conjugated unsaturated group. No radically polymerizable unsaturated monomer (a), preferably 45-98.5% by weight, and no radically polymerizable unsaturated monomer (c) having no conjugated unsaturated group, preferably 0.5-5 It can be obtained by emulsion polymerization of weight%.
[0011]
The copolymer emulsion (B) of the present invention is preferably a radically polymerizable unsaturated monomer (a) having no conjugated unsaturated group, preferably 95 to 99.5% by weight and an ethylenically unsaturated carboxylic acid. (B) It is preferably obtained by emulsion polymerization of 0.5 to 5% by weight.
[0012]
The radically polymerizable unsaturated monomer (a) having no conjugated unsaturated group used in the present invention is not particularly limited and can be used without any problem as long as it is conventionally used for radical polymerization.
[0013]
Examples of component (a) include acrylic acid esters such as methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate; methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, methacrylic acid Methacrylic acid esters such as cyclohexyl; Aromatic vinyl compounds such as styrene and vinyl toluene; Esters of ethylenically unsaturated carboxylic acids such as maleic acid, fumaric acid, and itaconic acid; Vinyl acetate, vinyl propionate, and tertiary carboxyl Vinyl esters such as vinyl acid; heterocyclic vinyl compounds such as vinyl pyrrolidone; vinyl chloride, acrylonitrile, vinyl ether, vinyl ketone, vinyl amide, etc .; vinylidene chlorides such as vinylidene chloride and vinylidene fluoride; ethylene, pro Α-olefins such as Len; monomers having two or more unsaturated bonds in one molecule such as diallyl phthalate, divinylbenzene, allyl acrylate, trimethylolpropane trimethacrylate; γ-methacryloxypropyltrimethoxysilane, And vinyl silanes such as vinyl trimethylsilane and vinyltriethoxysilane. Of course, it is not limited to these, It is also possible to use these together.
[0014]
The radical polymerizable unsaturated monomer having a conjugated unsaturated group represented by butadiene was used without using the radical polymerizable unsaturated monomer (a) having no conjugated unsaturated group used in the present invention. In such a case, a unsaturated polymerizable monomer having a conjugated unsaturated group is not preferable because unsaturated bonds remain in the resin obtained after polymerization and cause a deterioration in weather resistance.
[0015]
The radically polymerizable unsaturated monomer (a) having no conjugated unsaturated group may be used in combination of two or more.
[0016]
The ethylenically unsaturated carboxylic acid (b) is not particularly limited, and any ethylenically unsaturated carboxylic acid (b) can be used without any particular problem as long as it is conventionally used for radical polymerization.
[0017]
Examples of the component (b) include: acrylic acid, methacrylic acid, fumaric acid, itaconic acid, crotonic acid, fumaric acid monoester, itaconic acid monoester, maleic anhydride, itaconic anhydride, 2-methacryloylpropionic acid, Examples include 2-methacryloyloxyethylphthalic acid. Of course, it is not limited to these, It is also possible to use these together.
[0018]
The wax-based emulsion (C) of the present invention refers to a liquid wax, if necessary, a solid wax melted and dispersed in water using a dispersant such as a surfactant.
[0019]
The wax referred to here is, for example, waxes such as paraffin wax, beeswax, beef tallow, amide wax, etc., which are produced by melting them if necessary and dispersing them in water using a surfactant or the like. Can be mentioned.
[0020]
The wax-based emulsion (C) may be the same as or different from the seed of the wax-modified emulsion (A).
[0021]
The amount of the wax-based emulsion (C) used is preferably 50% by weight or less, more preferably 3 to 35% by weight as the solid content of the wax in the solid content of the resin composition for building base materials.
[0022]
The emulsifier used in the present invention is an essential component for stably performing emulsion polymerization and stabilizing the dispersion state of polymer particles in the emulsion after the completion of the polymerization, and has an anionic and nonionic surface activity. Agents. These can be used alone or in combination.
[0023]
Examples of the anionic surfactant include fatty acid salts such as potassium oleate and sodium oleate, sulfate esters of higher aliphatic alcohols, alkyl diphenyl ether disulfonates, and the like. Nonionic surfactants include For example, polyoxyethylene lauryl ether, polyoxyethylene nonyl phenyl ether, polyoxyethylene monolauryl ester, polyoxyethylene sorbitan monostearate and the like can be mentioned. Moreover, the reactive surfactant which has unsaturated groups, such as sodium p-styrenesulfonate, is also mentioned.
[0024]
These emulsifiers are preferably 0.5 to 10 with respect to 100 parts by weight of the total of the radically polymerizable unsaturated monomer (a) having no conjugated unsaturated group and the ethylenically unsaturated carboxylic acid (b). Used in the range of parts by weight.
[0025]
The wax-modified emulsion (A) used in the present invention is prepared by a seed polymerization method. That is, the monomer mixture comprising the above (a) and (b) is emulsified and dispersed in water with an emulsifier in a flask equipped with a stirrer containing a wax emulsion (C), preferably a peroxide such as potassium persulfate. The polymerization catalyst or a redox catalyst in which these peroxide catalyst and a reducing agent are combined as a polymerization initiator can be preferably produced by emulsion polymerization at 0 to 100 ° C. Moreover, it can also obtain through each process of removal of the unreacted monomer by stripping, concentration, and pH adjustment after completion | finish of polymerization as needed.
[0026]
The copolymer emulsion (B) used in the present invention is prepared by a usual emulsion polymerization method. That is, the monomer mixture consisting of the above (a) and (b) is emulsified and dispersed in water with an emulsifier in a flask equipped with a stirrer, preferably a peroxide catalyst such as potassium persulfate or these peroxide catalysts. Emulsion polymerization can be preferably carried out at a temperature of 0 to 100 ° C. using a redox catalyst in combination with a reducing agent as a polymerization initiator. Moreover, it can also obtain through each process of removal of the unreacted monomer by stripping, concentration, and pH adjustment after completion | finish of polymerization as needed.
[0027]
In the preparation for applying the resin composition for building foundation materials of the present invention, a colorant, a pigment, a filler, an antifoaming agent, an antiseptic, or a thickener for obtaining an appropriate coating workability as necessary. Any leveling agent or the like may be added.
[0028]
The architectural base material having water resistance and anti-slip property of the present invention is obtained by applying and drying the above-mentioned resin composition on the surface of a substrate. Examples of the building base material of the present invention include woody base materials such as plywood, particle board, and wood board.
[0029]
As a coating method, for example, a coating machine such as a roll coater, a knife coater, or a spray is used, or the surface of the wooden substrate is coated with a brush. Thereafter, it is forcibly dried by natural drying or hot air dryer, far-infrared dryer, high-frequency dryer or the like to obtain a coated woody substrate. The coating amount is preferably 30 to 100 g / m 2 .
[0030]
In addition, it may be naturally dried after being applied to the surface of the building base material using a brush, a roller brush, a spray, or the like at a site using a building base material such as a building site.
[0031]
【Example】
Next, the present invention will be described more specifically with reference to examples. In the following examples, “part” means “part by weight”.
[0032]
(Synthesis Example) (A), (B) Synthetic emulsions E-1 to E-4 are charged into a flask with a stirrer substituted with the composition described in Table 1 until the polymerization rate becomes 98% or higher at 70 ° C. Polymerization was carried out, and then the pH was adjusted to 8.0 with aqueous ammonia to prepare an emulsion having a solid content of 50%.
[0033]
The composition described in Table 1 as latex L-1 was charged into an autoclave equipped with a stirrer that was purged with nitrogen, polymerized at 70 ° C. until the polymerization rate reached 98% or more, and then adjusted to pH 8.0 with aqueous ammonia and dehydrated. Concentrated to prepare a latex with a solid content of 50%.
[0034]
[Table 1]
Figure 0003871101
[0035]
[Table 2]
Paint preparation
Figure 0003871101
[0036]
<Test method and evaluation criteria>
Water resistance test (1): 60 g / m 2 of resin composition is applied to a softwood structure plywood (material type: Douglas fir) using a roll coater (double coat), and at 55 ° C. with a hot air circulation dryer. A coated plywood specimen was prepared by drying for 40 minutes. Next, a transparent acrylic resin pipe with an inner diameter of 18 mm and a height of 120 mm is attached to the surface of each of the coated plywood specimen and the untreated plywood so that water does not leak, and 25 cc of water (water level 10 cm) is placed in the pipe. The change in quantity over time was measured.
[0037]
Water resistance test (2): Soft plywood structural plywood (material type: Douglas fir) coated with a resin composition in the same way as above and untreated plywood as the bottom plate with the coated surface as the top, and the square wood as the side plate As a result, boxes with internal dimensions of 3,600 mm in length, 3,600 mm in length and 100 mm in depth were prepared, respectively, and the seam between the plates was sealed with a moisture-curing urethane adhesive. Water was poured into the box until it reached a depth of 60 mm and left at room temperature for 5 days. The water was then drained and the state of the plywood was observed immediately after and after natural drying for 2 months.
[0038]
Anti-slip test: 10cm x 20cm coated plywood specimen and untreated plywood specimen prepared by the same method as the water resistance test are attached to an inclined plate, and 7cm x 9cm with a rubber sheet attached to the lower surface. A 1 kg weight was placed, and the angle at which sliding started was measured in accordance with the slope method of JIS P-8147 (paper and paperboard friction coefficient test method).
[0039]
Weather resistance test: The coating surface was left outdoors for 3 months, exposed to direct sunlight, and the water resistance test (1) and water resistance test (2), anti-slip test, and surface deterioration were observed.
[0040]
Blocking resistance test: Painted plywood specimens with a length of 20 cm and a width of 10 cm, prepared by the same method as the water resistance test, were left for 1 hour in a hot air circulating dryer adjusted to a temperature of 30 and 40 ° C., respectively, and then taken out. Three sheets were immediately stacked and pressed for 24 hours under conditions of a pressure of 0.3 to 1.0 kg / cm 2 , a temperature of 22 ° C., and a humidity of 60%, and the state when the plywoods were peeled was observed.
[0041]
[Criteria for blocking resistance test]
Can be peeled without any resistance ---- ◎
Can be peeled almost without resistance ---- ○
There is resistance when peeling ---- △
The paint film and plywood are sticking ---- ×
[0042]
[Table 3]
Example of evaluation results
Figure 0003871101
[0043]
[Table 4]
Comparative example
Figure 0003871101
[0044]
【The invention's effect】
The resin composition of the present invention can impart long-term water resistance and slip resistance to a building base material, and provides a building base material such as an excellent wall base material, floor base material and roof base material. In particular, the construction period can be shortened because there is no need for conventional sheet curing for the rain after the construction of the base material until finishing.
[0045]
On the other hand, in recent years, it has been difficult to secure South Sea wood from the viewpoint of wood resource protection. For this reason, effective utilization of conifers will become an important issue in the future, but coniferous plywood has an essential problem of large deformation due to water absorption. However, the present invention promotes the use of softwood plywood as a base material.

Claims (4)

ワックス系エマルジョン(C)をシードとし、共役不飽和基を有さないラジカル重合性不飽和単量体(a)及びエチレン性不飽和カルボン酸(b)からなる組成物を共重合して得られるワックス変性エマルジョン(A)を有効成分とすることを特徴とする建築下地材用樹脂組成物。Obtained by copolymerizing a composition comprising a radically polymerizable unsaturated monomer (a) having no conjugated unsaturated group and an ethylenically unsaturated carboxylic acid (b) using a wax emulsion (C) as a seed A resin composition for building base materials, comprising a wax-modified emulsion (A) as an active ingredient. (A)ワックス系エマルジョン(C)をシードとし、共役不飽和基を有しないラジカル重合性不飽和単量体(a)及びエチレン性不飽和カルボン酸(b)からなる組成物を共重合して得られるワックス変性エマルジョン、
(B)共役不飽和基を有さないラジカル重合性不飽和単量体(a)及びエチレン性不飽和カルボン酸(b)からなる共重合体エマルジョン、
(C)ワックス系エマルジョン、(A)(B)(C)いずれか2種以上を有効成分とすることを特徴とする建築下地材用樹脂組成物。
(A) copolymerizing a composition comprising a radically polymerizable unsaturated monomer (a) having no conjugated unsaturated group and an ethylenically unsaturated carboxylic acid (b) using the wax-based emulsion (C) as a seed; The resulting wax-modified emulsion,
(B) a copolymer emulsion comprising a radically polymerizable unsaturated monomer (a) having no conjugated unsaturated group and an ethylenically unsaturated carboxylic acid (b);
(C) A resin composition for a building base material, comprising two or more of wax-based emulsions (A), (B) and (C) as active ingredients.
ワックス系エマルジョン(C)が、ワックスを分散剤で水中に分散せしめたものであることを特徴とする請求項1又は2記載の建築下地材用樹脂組成物。The resin composition for building foundation materials according to claim 1 or 2, wherein the wax-based emulsion (C) is obtained by dispersing wax in water with a dispersant. 基材に請求項1から3いずれか記載の樹脂組成物を塗布乾燥してなる建築下地材。An architectural base material obtained by applying and drying the resin composition according to any one of claims 1 to 3 on a base material.
JP28802499A 1999-10-08 1999-10-08 Resin composition for building base material and building base material using the same Expired - Fee Related JP3871101B2 (en)

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