SH-916系列有机硅胶粘剂

SH-916系列有机硅胶粘剂

一、性能特点

916系列有机硅胶粘剂是以聚硅氧烷生胶和树脂为基料，再添加助剂的甲苯溶液，是一种耐高温压敏胶粘胶。可以和其它甲基硅氧烷压敏胶混合使用，以获得特定的性能。它能在较宽的温度范围内使用，并能粘结低表面能的难粘材料，如有机硅、含氟聚合物、聚烯烃等。

二、主要技术指标

注：配胶比例，按原胶:稀释剂:BPO＝100 /65 /1.5-2.0进行配比，经90℃*2min除溶剂，160℃*6min固化；测试条件：温度25℃、湿度55－65%，PET膜厚38um,干胶厚度在20－25um。

• 适用范围

作为压敏黏合剂可以用传统的高温胶带涂敷设备涂布于PET、铝箔等基材上以制作压敏黏粘带，具有良好的耐高温和耐化学性，也可应用于印刷线路板电镀工艺过程遮蔽、SMT制程、FPC、PCB板、喷砂、涂装、高温烤漆、镀金或电镀过程中遮蔽需保护部分，以及电子、电气等产品绝缘包扎固定等。

四、应用说明

由于基材、涂敷设备、固化周期和所需特性等因素的不同，固化剂（可用过氧化物类如BPO或DCBP，推荐用BPO)的加入量为胶水量的1.5～2.5%。为了保证固化剂和胶粘剂的良好混合，首先将其完全溶解于溶剂然后再加入到胶液，搅拌混匀。同时，在涂布上机前应再用250目以上的滤网过滤一次，以防止色膏或其它杂质颗粒的混入。

使用固化剂可以加快固化速度或允许在低温下固化，还可以提高粘合剂的内聚强度，提高其在基材上的附着性能。混合配制后的过氧物分散液只能使用一到两天，这是因为过氧化物在溶剂中会很快失去其活性。在混合过程中胶粘剂和过氧化物的充分分散是保证成品使用效果一致性的必要条件。

SH916系列粘合剂可以用传统的胶带涂敷设备直接涂布，在涂敷前可以进一步用相溶的溶剂如甲苯、二甲苯兑稀，工作液浓度以35%左右为宜，具体可根据各自的设备和经验来定。涂布使用溶剂时必须保证通风良好，并请遵守溶剂供应商的安全预防措施和相关法规。

在某些应用中，由于胶粘剂与背衬材料的结合度不够，就可能需要在涂布胶粘剂之前，先涂布一层底涂。底涂材料必须在使用前进行固化，固化条件取决于设备的性能、基材类型及所使用的配方。

表面硫化周期：80－90℃*2min除溶剂，以确保在进入固化区硫化时粘合剂中没有溶剂存在；160-170℃*6min，通过热固化使其粘合力、内聚强度以及初粘力进一步加强。但硫化所需的确切条件取决于加热炉的长度、温度和效率，固化剂的类型以及所使用的底材的类型，同时必须在设备上进行试验来确定该条件。

如果设备和基材允许使用更高的固化温度，则固化时间可以缩短。与低温固化相比，提高固化温度可以在更短时间内达到胶粘剂的内聚强度。

五、包装和贮运

装入清洁干燥的200kg或1000L钢桶中，加盖密封。室温（0～35℃）下贮存，防止阳光直接照射，储存期为6个月（超期检验合格，仍可使用），按危险品贮运。

SH-916 Silicone Adhesive Series

Ⅰ Performance Feature

The 916 series silicone adhesives are a kind of high-temperature resistant pressure-sensitive adhesive made from polysiloxane raw glue and resin as the base material, with the addition of toluene solution as an additive. It can be mixed with other methyl siloxane pressure-sensitive adhesives to achieve specific properties. It can be used within a wide temperature range and can bond difficult-to-bond materials with low surface energy, such as silicone, fluoropolymers, polyolefins, etc.

II Main Technical Index

Note: Glue mixing proportion，original glue: thinner :BPO = 100/65/1.5-2.0, remove the solvent at 90℃* 2min,cure at 160℃*6min ; Test conditions: temperature 25℃, humidity 55-65%, PET film thickness 38um , dried glue thickness 20 -25um .
III Application Range

As a pressure-sensitive adhesive, it can be coated onto substrates such as PET and aluminum foil using traditional high-temperature adhesive tape coating equipment to produce pressure-sensitive adhesive tapes. It has excellent high-temperature resistance and chemical resistance. It can also be applied to the masking of parts that need protection during the electroplating process of printed circuit boards, SMT processes, FPC, PCB boards, sandblasting, painting, high-temperature baking varnish, gold plating or electroplating processes, as well as the insulation wrapping and fixation of electronic and electrical products.

IV Application Specification 

Due to the differences in factors such as substrate, coating equipment, curing cycle and required properties, the addition amount of the curing agent (peroxides such as BPO or DPP can be used, and BPO is recommended) is 1.5 to 2.5% of the glue amount. To ensure the good mixing of the curing agent and the adhesive, first completely dissolve the curing agent in the solvent and then add it to the adhesive solution, and stir well to mix evenly. At the same time, before coating on the machine, it should be filtered once again with a filter screen of 250 mesh or more to prevent the mixture color paste or other impurity particles.

The curing agent can be used to accelerate the curing speed or allow for curing at low temperature, and it can also improve the cohesion strength of the adhesive and improve the adhesion property of the adhesive. The mixed and prepared dispersion liquid can only be used for one to two days, that is because the curing agent will lose its activity quickly in the solvent. The thorough dispersion of the adhesive and the peroxide during the mixing process is a necessary condition to ensure the consistency of the finished product's application effect.

The SH-916 series adhesives can be directly applied with traditional tape coating equipments. Before application, they can be further diluted with compatible solvents such as toluene and xylene. The concentration of the working solution is preferably around 35%, and the specific concentration can be determined according to each individual's equipment and experience. When using solvents for coating, it is essential to ensure good ventilation and please comply with the safety precautions and relevant regulations of the solvent supplier.

In some applications, due to the insufficient adhesion between the adhesive and the backing material, it may be necessary to apply a primer before applying the adhesive. The primer material must be cured before using, and the curing conditions depend on the performance of the equipment, the type of substrate and the formula used.    

Surface vulcanization cycle: 80-90℃*2 minutes for solvent removal to ensure that there is no solvent in the adhesive when it enters the curing zone for vulcanization. At 160-170℃ for 6 minutes, its adhesive force, cohesive strength and initial adhesion are further enhanced through thermal curing.  However, the exact conditions required for vulcanization depend on the length, temperature and efficiency of the heating furnace, the type of curing agent and the type of substrate used. At the same time, tests must be conducted on the equipment to determine these conditions.

If the equipment and substrate allow for a higher curing temperature, the curing time can be shortened. Compared with low-temperature curing, increasing the curing temperature can achieve the cohesive strength of the adhesive in a shorter time.

V Packaging,Storage&Delivery

Packed in clean and dry 200kg or 1000L steel drums, and seal tightly. Store at room temperature (0-35℃),avoid direct sunlight. The storage period is 6 months (if it passes the inspection after the expiration date, it can still be used). Transport and store as dangerous goods.