JPS5947698B2 - Method for improving powder properties of synthetic resin powder - Google Patents
Method for improving powder properties of synthetic resin powderInfo
- Publication number
- JPS5947698B2 JPS5947698B2 JP7388275A JP7388275A JPS5947698B2 JP S5947698 B2 JPS5947698 B2 JP S5947698B2 JP 7388275 A JP7388275 A JP 7388275A JP 7388275 A JP7388275 A JP 7388275A JP S5947698 B2 JPS5947698 B2 JP S5947698B2
- Authority
- JP
- Japan
- Prior art keywords
- powder
- resin powder
- properties
- synthetic resin
- improving
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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- Processes Of Treating Macromolecular Substances (AREA)
Description
【発明の詳細な説明】 本発明は合成樹脂粉末の粉体特性改良法に関する。[Detailed description of the invention] The present invention relates to a method for improving powder properties of synthetic resin powder.
ラテックスより合成樹脂粉末を得る方法としては、重合
ラテックスを塩あるいは酸により塩析する方法が一般に
行なわれている。A commonly used method for obtaining synthetic resin powder from latex is to salt out polymerized latex with salt or acid.
しかし乍ら通常の方法による場合は得られた樹脂粉末の
粉体特性が悪く、これを改良せんとして塩析方法に改良
工夫を加えるか、あるいは顆粒化する等の種々の検討が
なされているが、未だかゝる要求を十分に満足する方法
は見出されていない、といラのが実情である。こゝで本
発明にいう粉体特性とは樹脂粉末の流れ易さ(以下、流
動性と称する)、塊り易さとほぐれ易さ(以下ケーキシ
ダ性と称する)、かさ密度の三特性を指す。本発明者ら
は、以上の欠点に鑑み種々研究の結果、重合ラテックス
に滑剤を乳化して加え混合した後、アルカリおよび塩類
を添加することにより上記欠点を解消できることを見出
し本発明を完成した。However, when using conventional methods, the powder properties of the resin powder obtained are poor, and various studies have been made to improve this, such as adding improvements to the salting-out method or granulation. The reality is that no method has yet been found that fully satisfies these demands. The powder properties referred to in the present invention refer to three properties of the resin powder: ease of flow (hereinafter referred to as fluidity), ease of clumping and loosening (hereinafter referred to as cake fern), and bulk density. In view of the above drawbacks, the present inventors have conducted various studies and found that the above drawbacks can be overcome by emulsifying and mixing a lubricant into polymerized latex and then adding alkali and salts, thereby completing the present invention.
即ち、本発明は乳化重合ラテックスより樹脂粉末を得る
に当り、ラテックスに滑剤を添加した後、塩析を行い、
更に0.05乃至3PHRの塩類およびアルカリを添加
して系のpHを6.5乃至8にすることを特徴とする合
成樹脂粉末の粉体特性改良法を内容とする。That is, in the present invention, when obtaining resin powder from emulsion polymerization latex, after adding a lubricant to the latex, salting out is carried out.
The content of the present invention is a method for improving powder characteristics of synthetic resin powder, which is characterized by adding salts and alkalis of 0.05 to 3 PHR to adjust the pH of the system to 6.5 to 8.
本発明に採用する滑剤には、合成樹脂に汎用される滑剤
、例えばプロピレングリコールモノステアレート、ステ
アリルアルコール、グリセリン脂肪酸エステルその他が
使用される。The lubricant employed in the present invention includes lubricants commonly used for synthetic resins, such as propylene glycol monostearate, stearyl alcohol, glycerin fatty acid ester, and the like.
これらは単種で、または二種以上併用され、例えば予め
石けんによつて乳化し重合ラテックスに混合使用する方
法が望ましい。その使用量は0.1PHR〜1.0PH
R)好ましくは0.1〜0.5PHRであり、これによ
り樹脂粉末の流動性を改良出来る。塩類には、カルシウ
ム化合物、マグネシウム化合物、アルミニウム化合物等
が使用され、カルシウム化合物は、例えば塩化カルシウ
ム、硫酸カルシウム、炭酸カルシウム等であり、マグネ
シウム化合物は、例えば塩化マグネシウム、硫酸マグネ
シウム等が使用される。These may be used alone or in combination of two or more. For example, it is preferable to emulsify them in advance with soap and mix them into the polymerized latex. The usage amount is 0.1PHR ~ 1.0PH
R) Preferably 0.1 to 0.5 PHR, which can improve the fluidity of the resin powder. Calcium compounds, magnesium compounds, aluminum compounds, etc. are used as the salts. Examples of the calcium compounds include calcium chloride, calcium sulfate, calcium carbonate, etc., and examples of the magnesium compounds used include magnesium chloride, magnesium sulfate, etc.
これら塩類は水溶液として使用し、重合ラテックスを塩
析してから添加するのが最も好結果を与える。使用量は
製品物性に影響を与えない量であり、好ましくは0.0
5〜3.0PHRである。上記の如く少量の塩類を用い
た場合はアルカリ溶液の添加により系のpHを上げれば
樹脂粉末のケーキシダ性、かさ密度は著しく改良される
。この場合塩類或いはアルカリの添加は単独では効果が
無く、塩類−アルカリ両者の併用が必要である。系のP
Hは粒子表面反応の起こる領域を考えられるPH6.O
以上が良く、好ましくはPH6.5〜8.0である。ア
ルカリには、水酸化ナトリウム、水酸化カリウム等が使
用され、塩類およびアルカリの添加はどちらが先でも良
く、いずれの場合にも粉体特性の良好な樹脂が得られる
。Best results are obtained by using these salts as an aqueous solution and adding them after salting out the polymerized latex. The amount used is an amount that does not affect the physical properties of the product, preferably 0.0
It is 5-3.0 PHR. When a small amount of salt is used as described above, the cake fern properties and bulk density of the resin powder can be significantly improved by increasing the pH of the system by adding an alkaline solution. In this case, addition of salts or alkalis alone has no effect, and a combination of both salts and alkalis is required. system P
H is considered to be the region where particle surface reactions occur at pH 6. O
The pH is preferably 6.5 to 8.0. Sodium hydroxide, potassium hydroxide, etc. are used as the alkali, and either the salt or the alkali may be added first, and in either case, a resin with good powder properties can be obtained.
一方、塩析には塩酸、酢酸、燐酸などの酸、或いは塩化
ナトリウムなどの塩が使用される。On the other hand, for salting out, acids such as hydrochloric acid, acetic acid, and phosphoric acid, or salts such as sodium chloride are used.
これらは単種で、または二種以上併用される。滑剤・塩
類・アルカリの作用は定かではないが以下の如く推論さ
れる。These may be used alone or in combination. Although the effects of lubricants, salts, and alkalis are not clear, it is inferred as follows.
重合ラテツクス中の滑剤は系中にほぼ均一に分散されて
おり、これを塩析すると塩析粒子表面に滑剤が吸着或い
は粒子に内包され、粒子間滑剤として作用し流動性を改
良する。一方、塩析により形成された粒子雰囲気中に上
述のカルシウム、マグネシウム化合物等の塩類が存在し
、しかも系のPHが表面反応の起こりうる範囲にあれば
カルシウム、マグネシウム等の金属が粒子表面上で塩形
成の化学反応を起こし、ほぼ均一に表面吸着層を形成し
粒子間の相互作用が低減する結果、ケーキング性、かさ
密度が改良される。叙上の通り、本発明によればアルカ
リー塩類併用による樹脂粉末の表面改質効果により、樹
脂粉末の見掛比重、ケーキング性が著しく改良され、更
に滑剤の効果により樹脂粉末の流動性が改良される。The lubricant in the polymerized latex is almost uniformly dispersed in the system, and when it is salted out, the lubricant is adsorbed on the surface of the salted-out particles or encapsulated in the particles, acting as an interparticle lubricant and improving fluidity. On the other hand, if salts such as the above-mentioned calcium and magnesium compounds are present in the particle atmosphere formed by salting out, and the pH of the system is within the range where surface reactions can occur, metals such as calcium and magnesium will be present on the particle surface. A chemical reaction of salt formation occurs, forming a nearly uniform surface adsorption layer and reducing interaction between particles, resulting in improved caking properties and bulk density. As mentioned above, according to the present invention, the apparent specific gravity and caking properties of the resin powder are significantly improved due to the surface modification effect of the resin powder combined with the alkali salt, and the fluidity of the resin powder is further improved due to the effect of the lubricant. Ru.
尚、本発明は乳化重合により得られる全てのラテツクス
に適用できる。以下、実施例を挙げて本発明を説明する
。Incidentally, the present invention is applicable to all latexes obtained by emulsion polymerization. The present invention will be explained below with reference to Examples.
尚、実施例中、流動性指数とは“ChemicalEn
gineering,,,Januaryl8,l63
〜168,1965の記載により、安息角、圧縮度、ス
パテユラ角、均一度(又は凝集度)の4つの測定値を求
め、その値より換算表に従つて点数をつけこれらの和で
表わされる指数であり値の高い程流動性が良い。また、
ケーキング性の評価は樹脂粉末に一定の荷重をかけて塊
とし、これに一定の振動を与えて塊り自体の壊れ易さを
時間(秒)で表わしたものであり、100%壊れるまで
の時間が短いほどケーキング性が良い。In addition, in the examples, the fluidity index is “Chemical En
gineering,,, January8, l63
168, 1965, the four measured values of the angle of repose, degree of compaction, angle of spatula, and degree of uniformity (or degree of cohesion) are obtained, and points are given according to the conversion table based on the values, and an index is expressed as the sum of these values. The higher the value, the better the fluidity. Also,
The caking property is evaluated by applying a certain load to the resin powder to make it into a lump, applying a certain vibration to it, and expressing the breakability of the lump itself in time (seconds). The shorter is, the better the caking property is.
実施例 1
401ステンレス製反応釜に、純水20Kg、SBR5
Kg、スチレン2.5Kg、アクリロニトリル2.5K
g、キユメンハイドロパーオキサイド0.02K9、オ
レイン酸ソーダ0.IKg、EDTAO.OO3助、F
eSO4O.OOl5Kgを仕込み、内濶を50℃に保
ち2時間反応させてラテツクス(転化率95%)を得た
。Example 1 20 kg of pure water and SBR5 were placed in a 401 stainless steel reaction pot.
Kg, styrene 2.5Kg, acrylonitrile 2.5K
g, kyumene hydroperoxide 0.02K9, sodium oleate 0. IKg, EDTAO. OO3suke, F
eSO4O. 5 kg of OOl was charged, and the reaction was carried out for 2 hours while keeping the inner temperature at 50°C to obtain latex (conversion rate 95%).
このラテツクスを用いて滑剤、アルカリ、塩類の条件を
変えてラテツクス処理し、得られた樹脂粉末の粉体特性
を観察した。Using this latex, latex treatment was performed by changing the conditions of lubricant, alkali, and salt, and the powder characteristics of the resulting resin powder were observed.
結果を表−1に示した。実施例 2
401ステンレス製反応釜に、純水20Kf1SBR2
.5K!、スチレン3.5Kf1メチルメタアクリレー
ト2.5Kf、アクリロニトリル1.5!、オレイン酸
ソーダ0.25Kf..EDTA0.003Kbf1F
eS040.0015!を仕込み、内温を60℃に保ち
ながら6時間反応させ重合ラテツクスを得た。The results are shown in Table-1. Example 2 Pure water 20Kf1SBR2 in a 401 stainless steel reaction pot
.. 5K! , styrene 3.5Kf1 methyl methacrylate 2.5Kf, acrylonitrile 1.5! , sodium oleate 0.25Kf. .. EDTA0.003Kbf1F
eS040.0015! was charged and reacted for 6 hours while maintaining the internal temperature at 60°C to obtain a polymerized latex.
Claims (1)
テックスに滑剤を添加した後、塩析を行い、更に0.0
5乃至3PHRの塩類およびアルカリを添加して系のp
Hを6.5乃至8にすることを特徴とする合成樹脂粉末
の粉体特性改良法。4 In obtaining resin powder from emulsion polymerization latex, after adding a lubricant to the latex, salting out is performed, and further 0.0
Add 5 to 3 PHR of salts and alkalis to reduce system p.
A method for improving powder properties of synthetic resin powder, characterized by adjusting H to 6.5 to 8.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7388275A JPS5947698B2 (en) | 1975-06-17 | 1975-06-17 | Method for improving powder properties of synthetic resin powder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7388275A JPS5947698B2 (en) | 1975-06-17 | 1975-06-17 | Method for improving powder properties of synthetic resin powder |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS51149360A JPS51149360A (en) | 1976-12-22 |
JPS5947698B2 true JPS5947698B2 (en) | 1984-11-21 |
Family
ID=13531007
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7388275A Expired JPS5947698B2 (en) | 1975-06-17 | 1975-06-17 | Method for improving powder properties of synthetic resin powder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5947698B2 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6394834B1 (en) * | 2016-10-31 | 2018-09-26 | 日本ゼオン株式会社 | Acrylic rubber manufacturing method |
WO2018079783A1 (en) * | 2016-10-31 | 2018-05-03 | 日本ゼオン株式会社 | Acrylic rubber and crosslinked rubber |
JP6696585B2 (en) * | 2016-10-31 | 2020-05-20 | 日本ゼオン株式会社 | Acrylic rubber and crosslinked rubber |
WO2018079784A1 (en) * | 2016-10-31 | 2018-05-03 | 日本ゼオン株式会社 | Acrylic rubber and method for producing same |
JP6753430B2 (en) * | 2018-04-27 | 2020-09-09 | 日本ゼオン株式会社 | Acrylic rubber manufacturing method |
-
1975
- 1975-06-17 JP JP7388275A patent/JPS5947698B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS51149360A (en) | 1976-12-22 |
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