陶氏DOW硅氧烷DOWSIL™ 87 Additive_进口硅氧烷价格-上海凯茵化工

产品品牌美国陶氏

产品产地
产品型号DOWSIL™ 87 Additive

包装规格

陶氏DOW硅氧烷DOWSIL™ 87 Additive

40％活性硅烷基乳液。它可用于水性丙烯酸配方，以改善防水性。

增加水珠

增加拒水性

] 蒸汽渗透性

用于提高装饰涂料耐水性的高性能添加剂

你想增加您的木材，砖石和其他多孔装饰涂料配方的耐水性，但还没有因为目前可用的有机硅产品所需的高添加量？ DOWSIL™87添加剂可以提供帮助。

DOWSIL 87添加剂是一种乳白色硅树脂乳液，设计用于水性涂料。该添加剂通过c改善耐水性在涂料中涂覆疏水性硅氧烷网络，排斥水，但可透过来自基材的水蒸气。因此，水渗透性降低，同时裂缝和起泡最小化。

DOWSIL 87添加剂的优点

无溶剂和无APEO

贡献＆lt; ;按重量计最多5％时使用10克/升挥发性有机化合物

仅按重量计1％的添加剂减少吸水率

对水渗透性的影响可忽略不计，即使加入5％也是如此重量

增加接触角以获得更好的水珠

当使用量达到5％（重量）时，保持可涂漆表面

在水性丙烯酸，苯乙烯丙烯酸和乙酸乙烯酯体系中有效[ 123]

添加剂水平的性能：减少吸水率测量通过漆膜的吸水率（W

24

）作为时间的函数。涂层的吸水率越低，薄膜提供的防水性越强，其提供的保护越大。即使添加量仅为2％，DOWSIL 87添加剂也能降低吸水性。

图1：W 24 丙烯酸基乳液涂料有无DOWSIL™87（A）和88（B）添加剂和竞争对手的有机硅树脂乳液。

DOWSIL

87添加剂减少吸水时，它仍然允许来自基材的水蒸气通过硅树脂网络，防止裂缝和起泡，这可能是一些装饰涂层的问题。水蒸气渗透性报告为Sd值并且是水的函数蒸汽透过率。即使在具有优异水蒸汽渗透性的高PVC涂料配方中，DOWSIL 87当在高添加水平下使用时，添加剂对Sd值的影响最小（图2）。

图2：含有和不含DOWSIL™87的高PVC涂料配方的水的Sd（ A）和88（B）添加剂。

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图3：丙烯酸树脂的W24-含有和不含DOWSIL™87（A）和88（B）添加剂的基础乳胶漆和竞争对手的有机硅树脂乳液。

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]

要了解有关这些产品的更多信息，请阅读DOWSIL™87添加剂和DOWSIL™88添加剂信息表。

查看产品信息►

A 40% actives silane based emulsion. It can be used in waterborne acrylic formulations to improve water repellency.

Increased Water Beading

Increased Water Repellency

Vapor Permeability

High-Performance Additives for Improved Water Resistance in Decorative Coatings

Do you want to increase the water resistance of your wood, masonry and other porous decorative coating formulations, but haven’t yet because of the high addition levels required for currently available silicone products? DOWSIL™ 87 Additive can help.

DOWSIL 87 Additive is a milky white silicone resin emulsion designed for use in waterborne paints. This additive improves water resistance by creating a hydrophobic silicone network in the paint that repels water but is permeable to water vapor coming from the substrate. As a result, water penetration is reduced while cracking and blistering are minimized.

Advantages of DOWSIL 87 Additive

Solvent-free and APEO-free
Contribute <10 g/l VOCs when used at up to 5% by weight
Reduce water absorption at only 1% additive addition by weight
Negligible impact on water permeability, even at 5% addition by weight
Increased contact angle for better water beading
Maintain paintable surfaces when used at up to 5% by weight
Effective in waterborne acrylic, styrene acrylic and vinyl acetate systems

Performance at Additive Levels: Reduced Water Absorption

Water absorption (W₂₄) through a paint film is measured as a function of time. The lower the water absorption of a coating, the more water resistance the film offers and the greater protection it provides. Even at only 2% addition by weight, DOWSIL 87 Additive provides reduced water absorption.

Figure 1: W₂₄ of an acrylic-based emulsion paint with and without DOWSIL™ 87 (A) and 88 (B) Additives and vs. a competitor silicone resin emulsion.

Graph: Acrylic-based emulsion paint with and without 87 and 88 Additives and vs. competitor silicone resin emulsion

The Best of Both Worlds: Excellent Water Vapor Permeability

While DOWSIL 87 Additive reduces water absorption, it still allows water vapor coming from the substrate to pass through the silicone network, preventing the cracking and blistering that can be a problem with some decorative coatings. Water vapor permeability is reported as the Sd value and is a function of the water vapor transmission rate.

Even in a high-PVC paint formulation that has excellent water vapor permeability, DOWSIL 87 Additive has a minimal impact on the Sd value when used at a high addition level (Figure 2).

Figure 2: Sd of water of a high-PVC paint formulation with and without DOWSIL™ 87 (A) and 88 (B) Additives.

Graph: High-PVC paint formulation with and without 87 and 88 Additives

Seeing is Believing: Visual Results Underscore Real Performance

Consumers often feel more comfortable with a product when they have visual confirmation of its performance. When it comes to water resistance, they want to see water beading on the coated surface. Better water beading is reflected in a higher contact angle of water on a paint film. DOWSIL 87 Additive shows a marked increase in contact angles in acrylic resin formulations, even at a low addition level of 2%, and clearly outperforms a competitor emulsion resin.

Figure 3: W24 of an acrylic-based emulsion paint with and without DOWSIL™ 87 (A) and 88 (B) Additives and vs. a competitor silicone resin emulsion.