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6012 聚醋酸乙烯乳液
POLYVINYL ACETATE EMULSION

一、聚醋酸乙烯乳液的性质

1 、聚醋酸乙烯乳液的英文名称: POLYVINTLAcetateEmulsion 。 2 、聚醋酸乙烯乳液的性质;聚醋酸乙烯乳液是一种白色均匀乳状液、无毒、无臭、无腐蚀性,是非易燃易爆品,能与水混合,不易与有机溶剂如甲醇、乙醇、丙酮等混合。本品具有干燥快,使用携带方便等优点。 3 、分子式: (CH 2 CHCOOCH 3 ) n

4 、结构式: (CH 2 — CH) n
     |
     O — C=O
         |
        CH 3

5 、分子量: 86.09 × n(n 为平均聚合度 ) 。
6 、外观:乳白色均匀乳状液
7 、比重: 1.05
8 、粘接性:对纤维、木材、纸张、水泥、皮革等具有良好的粘接力。
9 、成膜性:常温下具有良好的成膜性。
10 、化学稳定性: pH 3 ~ 7 为宜,耐弱酸弱碱,但不耐强酸强碱及有机溶剂。

二、聚醋酸乙烯乳液的用途
  
聚醋酸乙烯乳液是一种高分子乳化聚合物,对纸张、木材、皮革、棉毛织物有较好的粘接性能,它具有价格低廉、无公害、常温固化快,使用方便等特点,已广泛应用于各行各业和我们的日常生活中。
   1 、木材加工:用于木材行业代替其它粘合剂,可以粘接铅笔、木箱、胶合板、纤维板、塑料贴面板及家具等,使用方便、粘接力强、无毒、无臭、耐老化、粘接后无色透明,外观整洁漂亮。
   2 、印刷行业:目前广泛用于无线装订,提高工作效率,减少锁线工序,节约棉线和粮食,减轻工人劳动强度,操作方便,提高书本质量。
   3 、建筑行业:可以利用乳液增加水泥的强度和弹性,大白浆中加入乳液用于室内墙壁及天花板的粉刷,涂膜干燥快、成膜光滑、平整、粘接强度大、耐酸碱、不易掉粉、起皮脱落,很受用户欢迎。
   4 、涂料应用:用本品制作乳胶漆,可以代替植物油,节约大量用油,以代替有机溶剂,无毒、不燃烧、安全可靠,在内墙使用具有光泽柔和、不刺眼、涂层平滑、不起泡、施工方便、喷刷方便、可以缩短工期等优点,得到广泛的重视和使用。
   5 、纸张加工:用本品处理纸张,可以提高纸张的柔软性及韧度,提高耐水、抗扯裂等机械性能,经过表面涂层处理的纸张,可以提高光泽及耐油、耐水性等。
   6 、纤维加工:用本品在纺织品印染中,可以作为颜料的固着剂,并可使织物挺括,耐磨及平整等性能增大,而且还可以应用在无纺布、植绒加工、服装加工等方面。
   7 、其它方面:本品还是砂纸、砂带、皮带、泡沫塑料、陶瓷等良好的粘接剂,可以做日光灯荧光粉的分散剂等。

三、聚醋酸乙烯酯乳液的质量指标

序号

指标项目

国家标准 GB11178 - 89

BJ - 235

Ⅰ型

Ⅱ型

1

外观

 

乳白色,无颗粒异物

2

pH 值

 

3 ~ 7

3

固含量 ,%

≥ 40

35 ± 2

4

粘度 ,mpa · s

≥ 500

10000 ~ 50000

5

残存单体 ,% ≤

 

0.5

6

灰分 ,% ≤

 

3

7

粒径 , μ m ≤

 

2

8

压缩剪切强度 ,MPa ≤

9.8

6.9

9.8

9

稀释稳定性 ,ml ≤

 

3

10

最低成膜温度 , ℃ ≤

17

4

5


聚醋酸乙烯乳液

一、产品介绍 :

聚醋酸乙烯乳液,是一种高分子乳状液。

结构式:

  聚醋酸乙烯乳液为乳白色液体,俗称白胶。无毒、无味、无臭不易燃易爆。使用时不会污染环境,价格便宜,使用方便。对于木材、纸张、纤维等材料粘接力强,因此广泛用于印刷业,木材粘接、合板加工、建筑业、皮鞋、卷烟业、纸张加工、纤维加工、铝箔纸加工、砂布砂纸粘合、内墙涂料,铸钢用绝热板加工等许多方面。

二、规格 :

牌号

固含量

%

粘度

MPa · s

pH 值

残存 VAC%

粒度微米

稀释稳定性

压缩剪切强度 MPa

冻融稳定性 -15 ℃ 16 小时

灰粉 %

使用温度

BJ-235

35 ± 2

10000 ~ 50000

3 ~ 7

≤ 1.0

2

 

9.8

 

≤ 3.0

> 10 ℃

外观

白色均匀乳液

三、一般性能:

  本产品为非易燃易爆品,无毒、无臭、无腐蚀、携带运输都很方便。
   1 .粘接性:对于木材、纸张、纤维、水泥、陶瓷、皮革等有良好的粘接力,对木材粘接的剪切强度达 9.8MPa 以上。
   2 .耐气候性:本产品可在 l0 ~ 40 ℃ 温度范围内使用, 0 ℃ 以上贮存,不能长期耐紫外线照射。
   3 . pH 值稳定性: pH=3 ~ 7 为宜,贮存较为稳定。
   4 .稀释稳定性:乳液的稀释稳定性,是由乳液的粒度、粘度等因素决定。乳液经过稀释后,由于粘度的降低,促进沉淀现象的发生,因此,使用时对于稀释的程度要经过试验方可决定。该产品稀释加水量为乳液重量的 l/4 ~ l/3 , 30 ~ 40 ℃ 温水为宜 ( 指一般用粘合剂 ) 。
   5 .机械稳定性:乳液在激烈摇动和高速搅拌下,由于机械作用而破乳。
   6 .成膜性和最低成膜温度:本产品具有良好的成膜性,成膜时由于水分蒸发,乳液的粒子相互融结,于是形成薄膜。因此,乳液的最低成膜温度就是乳液的最低使用温度,最低成膜温度对于薄膜的性能及粘接强度有极为重要的影响。本产品在 5 %增塑剂含量下,最低成膜温度为 10 ℃ 左右。
   7 .冻融稳定性、乳液中含有大量的水,温度降到一定程度,都要发生冻结,冻融稳定性是指乳液经过冻结后,在一定温度的热水中间接加热融化,而能恢复原来的乳状,不会丧失原来的使用性能。

四、使用性能:
  
1 .粘度:粘度的大小,是根据使用的要求选定的。不能说明乳液质量的优劣。更不能认为粘度大,固含量就高。使用时就可多加水,结果往往会发生问题。
   2 .本产品有多种粘度,适应性强,选择何种粘度,则由用户的施工条件所决定,可适当加水或增塑剂自行调节。稀释后的乳液,不要长期存放,切不可以与强酸、强碱及有机溶剂混用,以防破乳,造成浪费。
   3 .粘接强度和加水:由于用户对粘接强度的要求不同,对乳液的使用方法各异,有的不加水,有的加水,有多有少,也有的与其他组分混用。乳液加水后,会引起粘接强度的下降。加水量越大,粘接强度下降越多,干燥时问也会延长。
   4 .乳液的使用温度必须在 10 ℃ 以上,操作温度过低,会造成粘接强度下降或粘接不上的现象,粘接后的产品在未干以前,应在 10 ℃ 以上的环境下放置。否则也会造成开胶现象。影响产品质量。
   5 .乳液在冬季由于保管条件不好,或在运输途中受冻,在没有解冻之前,不要加水或其他东西,也不能搅拌,把冻结的乳液放在 30 ~ 40 ℃ 左右的暖房内,让其自然解冻。待恢复原来的外观方可继续使用。 ( 只限冬季生产的乳液 ) 。如果乳液冻结严重或时间过长,造成胶体破坏,经上述方法解冻无效,则不能再继续使用。判断乳液是否冻坏有两种现象:一种是乳液不能恢复原状,呈坨状。没有流动性。第二种是水和聚醋酸乙烯分层,清楚地分为水层和固体层,不再是乳液。
   6 .用乳液粘接后的成品,干燥温度一般不能超过 120 ℃ 。

五、贮运注意事项:
  
1 .本品为水分散系乳液,属非危险品,便于携带运输。
   2 .在搬运时,防止猛烈撞击、倒置、以防破碎和漏损。
   3 .应放在玻璃、瓷器、或塑料袋内。避免直接装入铁、铜容器或与强酸、强碱接触。
   4 .使用后应将容器盖紧,以防自然干燥结皮。
   5 .必须在室内 0 ℃ 以上贮存避免露天堆放。
   6 .乳液是聚醋酸乙烯微粒分散于水中的亚稳定性体系,所以有一定的期限,我厂规定贮存期为半年,如果过期后,乳液没有异常现象,仍可继续使用。

POLYVINYL ACETATE EMULSION

一. Product description

Polyvinyl acetate emulsion is a high polymer, milky liquid .
Structural formula:

  It is milk-white , non-poisonous , odorless , unflammable and unexplosive . It can be easily used without any environmental pollution as well as at a reasonable price . Highly adhesive to timber, paper and fibers , widely used in printing, timber adhesion, veneer sheet processing , building industry, leather shoes , cigarettes , paper processing , fiber processing, aluminum foil-paper processing , emery-paper and emery-cloth adhesion . interior coating and heat insulating board in steel casting , etc .

二. Specification

Categor

Solid

%

Viscosity

MPa·s

pH

Residual

VAC%

Particle

Size,μ

Diluting stability,ml

Wood bond strength

Freeze-thaw

Stability 15 ℃ ,16hours

Ash

content

Tempera ture for using

BJ-235

35 ± 2

10000 ~ 50000

3 ~ 7

≤ 1.0

2

 

9.8

 

≤ 3.0

> 10 ℃

Appearance

White even emulsion

三. General properties
  
This product is unflammable and unexplosive , non-poisonous , odorless. non-corro-sive , being convenient for transportation .
   1.Adhesivity:Good adhesion to timber, paper, fiber, cement, ceramic and leather, etc . Shear strength. of timber adhesion is up to 9.8 MPa or more .
   2.Weather resistance : Used within the temperature range of 10 ~ 40 ℃ and stored above 0 ℃ . Cannot be exposed to ultraviolet rays for a long time .
   3 . pH stability : pH 3 ~ 7 is preferable for storage .
   4 . Dilution stability : This property is determined by particle size and viscosity 0f emulsion · After diluting , sediment may appear because of the reduction of viscosity . S0,take care of the amount of water when diluting . Water added to this product is 1/4-1/3 Of the weight of emulsion , at 30 ~ 40 ℃ (for general purpose adhesives) .
   5 . Mechanical stability : The emulsion can be deteriorated by fierce shaking and high-speed stirring .
   6 . Film-forming and minimum film-forming temperature (MFT) : it has good film . forming property . Film is formed by means of cohesion of the particles due to water evaporation . The minimum film-forming temperature of emulsion means minimum working temperature of it . The MFT is of great influence to the properties of the film and the adhesion strength . For this product with 5 % plastisizer, the MFT is about 10 ℃ .
   7 . Freeze . thaw stability : There is a lot of water io the emulsion and when the tern 。 Derature is lower than a certain value , it may be freezing . Freeze · thaw stability means the frozen emulsion can be recovered to milky form by heating up in warm water at a proper temperatu re , and still keeps its original performance.

四. Performance property :
  
1 . Viscosity : it can be varied according to application requirements . One should not take it for granted that the more sticky it is , the more solid in the emulsion . There may cause some problems when adding too much water into the emulsion.
   2 . Adhesive strength : This product has a wide range of viscosity and is suitable for many different purpose . Customers can select viscosity according to practical use . The after . diluting emulsion can not afford long storage . Never mix with strong acid , alkali and organic solvent , for fear lest deterioration.
   3 . Relationship between adhesive strength and water : Adhesive strength will be reduced by adding water into emulsion . The more water is added , the poorer the adhesive strength becomes . The time for drying will be longer under such condition . Adjustment can be made by adding some water or plastisizer .
   4 . The working temperature of emulsion must be above 1 0 ℃ . So does the laydown of undried objects after bonding , otherwise the objects may be of poor adhesive strength and easily split out .
   5 . In case the emulsion is freezing due to improper storage condition or transportation in cold weather, neither add water and other material nor agitate it . Put it in a warm room at 30 ~ 40 ℃ for thawing by itself . It can be used when it recovers to its original appear- ance(only for those produced in winter).If the emulsion is freezing seriously or too longwhich resulting deterioration of it , and after above-mentioned thawing it doesn ′ t recover, then it can not be used any more . There are two phenomenon used to judge whether it is deteriorated or not . One is that the emulsion appears as a block , and is no longer flowable. Another is that water and polyvinyl acetate is double-layered , with one layer water and another polyvinyl and being no longer emulsion .
   6 . Drying temperature for emulsion bonded objects should not exceed 120 ℃ in general .

五. Storage and handling :
  
1 . This product is water dispersible emulsion , and causes no danger or problems in transportation .
   2 . When transporting , take care to avoid collision or put the containers upside-down so as to prevent breakage and leakage .
   3 . Containers made of glass , porcelain or plastic bags are suggested . Never be stored directly in containers made of iron or copper . Keep away from strong acid and base .
   4 . Seal the containers tightly after using , to prevent from drying and skinning ·
   5 . Store indoors above 0 ℃ . Avoid exposure to the weather .
   6 . This emulsion is sub-stable with polyvinyl acetate particles dispersed in water . It has time limit on storage and in general it is 6 months . In case of longer storage , it can still be used if it shows no unusual appearance .




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