Addition type liquid silicone rubber tackifier, as well as preparation method and application thereof

Abstract

The invention discloses an addition type liquid silicone rubber tackifier, as well as a preparation method and application thereof. The preparation method comprises the following steps of step 1, mixing 80-120 parts of an acrylic compound containing phenyl groups and ester groups with 0.006-0.06 part of a platinum catalyst solution of which the mass concentration is 0.05-0.5% to obtain a mixture, and preheating the mixture at certain temperature environment for some time so as to obtain mixed liquor for standby application; step 2, adding 100-150 parts of D4H containing silicon-hydrogen bonds, 100-200 parts of toluene and 0.12-0.50 part of p-hydroxyanisole to a round-bottomed flask, and raising temperature while stirring; step 3, when the temperature in the round-bottomed flask reaches to 40-90 DEG C, dropwise adding the mixture in the step 1 to the round-bottomed flask; step 4, after the mixture is dropwise added, controlling the reaction temperature to 60-100 DEG C, and performing a reaction for 1-5h; and step 5, after the reaction is completed, cooling reaction fluid to room temperature, then adding activated carbon for adsorbing residual platinum catalysts, and finally performing sucking filtration and rotary evaporation on the reaction fluid so as to obtain the tackifier. According to the addition type liquid silicone rubber tackifier, as well as the preparation method and application thereof disclosed by the invention, a small quantity of the tackifiers are added to shaping liquid silicone rubber, so that the bonding failure between the shaping liquid silicone rubber and PC plastic cement reaches to 100% cohesive failure.

Description

technical field [0001] The invention relates to the technical field of silicone material bonding, in particular to an addition-type liquid silicone rubber tackifier, a preparation method and an application thereof. Background technique [0002] Addition-type liquid silicone rubber (LSR) is a non-toxic, odorless, silicone material with excellent moisture resistance, cold resistance, heat resistance, insulation, radiation and weather resistance. It is widely used in electronics, construction, automobiles, machinery, and medical treatment. and other fields. However, after the addition-type liquid silicone rubber is cured, most of the molecular surfaces are non-polar groups, resulting in very poor adhesion between the addition-type liquid silicone rubber and other materials. Therefore, the addition-type liquid silicone rubber is modified so that it has a strong bonding effect with other materials. [0003] There are three main methods for bonding addition-type liquid silicone ...

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Problems solved by technology

[0003] There are three main methods for bonding addition-type liquid silicone rubber to other materials: ①Primer treatment of the surface of the substrate: the use of a primer can make liquid silicone rubber and the substrate strongly bonded, but this method has complicated procedures and is difficult to produce structures Complicated parts; at the same time, the primer contains volatile and flammable solvents, causing transportation and production hazards, endangering the health and safety of production personnel and polluting the environment

② Improve the adhesive performance by changing the molecular structure of polysiloxane: graft functional groups such as hydroxyl, ester, epoxy, phenyl and alkoxy groups onto the polysiloxane molecular chain, thereby increasing the addition type The bonding performance of liquid silicone rubber to the substrate, but due to the complex synthesis process and high cost, its application is limited

Chinese patent CN103360422A discloses a tackifier synthesized with 1,6-hexanediol diacrylate and tetramethylcyclotetrasiloxane, which is added to addition-type liquid silicone rubber to aromatic polycarbonate Bonding can be formed, but its adhesive failure to PC is a cohesive failure rate of 40%-60%, which cannot reach 100% cohesive failure

Japanese patent CN102675884A discloses a kind of tackifier synthesized by hydrogen silicon oil and allyl glycidyl ether containing phenyl group, the tackifier can achieve bonding with silica gel and thermoplastics, but the synthetic raw material The high cost limits its use

[0006] Although there have been reports on tackifiers that improve the adhesion of addition-type liquid silicone rubber, most of these studies have poor compatibility between tackifiers and addition-type liquid silicone rubber, which can easily poison the catalyst and reduce the mechanical properties of silica gel. and other characteristics, which have seriously affected the application and promotion of addition-type liquid silicone rubber tackifiers in industrial production.

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