陶氏DOW硅氧烷DOWSIL™ 88 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™ 88 Additive

包装规格

陶氏DOW硅氧烷DOWSIL™ 88 Additive

98％活性硅烷/硅氧烷浓缩物。它可用于含有丙烯酸配方的极性和非极性溶剂中，以改善防水性。

防水性

蒸气渗透性

[ 123]保护

提高装饰涂料耐水性的高性能添加剂

你想增加耐水性吗？您的木材，砖石和其他多孔装饰涂料配方，但还没有因为目前可用的有机硅产品所需的高添加量？ DOWSIL™88添加剂可以提供帮助。

DOWSIL 88添加剂是一种硅烷/硅氧烷混合物，VOC含量为73克/升。它在提高丙烯酸的耐水性方面是有效的含有极性溶剂的乳液漆和溶剂型体系。这种添加剂通过在涂料中形成疏水性硅氧烷网络来改善耐水性，该网络排斥水但是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 88添加剂的优点

无溶剂和无APEO

贡献＆lt; ;当使用量高达5％（重量）时，10克/升挥发性有机化合物

减少吸水量仅为1％（重量）添加

对水渗透性的影响可忽略不计，即使添加量为5％也是如此

当按重量计最多使用5％时，可保持可涂漆表面

在溶剂型装饰涂料中有效

在添加剂水平下的性能ls：减少吸水

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 88添加剂也能降低吸水性。}

使用DOWSIL 88添加剂时，5％的添加量表明吸水率进一步降低，而竞争对手的有机硅树脂则不提供额外的保护。添加水平从5％增加到10％。

图1：W 24 _{含有和不含DOWSIL™87（A）和88的丙烯酸基乳胶漆（B）添加剂和竞争对手的有机硅树脂乳液。}

The Best两个世界：优异的水蒸气渗透性

虽然DOWSIL 88添加剂可以减少水分吸收，但允许来自基材的水蒸气通过硅树脂网络，防止开裂和起泡，这可能是一个问题同一些装饰涂料。水蒸汽渗透率报告为Sd值，并且是水蒸气透过率的函数。

即使在具有优异水蒸气渗透性的高PVC涂料配方中，DOWSIL 88添加剂对其的影响也很小。在高添加水平下使用时的Sd值（图2）。

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

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™ 88 Additive can help.

DOWSIL 88 Additive is a silane/siloxane blend with a VOC content of 73 g/l. It is effective at improving water resistance both in acrylic emulsion paints containing polar solvents and in solvent-based systems. 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 88 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% addition by weight
Negligible impact on water permeability, even at 5% addition by weight
Maintain paintable surfaces when used at up to 5% by weight
Effective in solvent-based decorative paints

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 88 Additive provides reduced water absorption.

With DOWSIL 88 Additive, addition at 5% shows even further reduction in water absorption, while a competitor silicone resin provides no additional protection when the addition level is increased from 5% to 10%.

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 88 Additive reduces water absorption, yet 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 88 Additive has only 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.