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Dam adhesive and preparation method thereof, and fumed silica and preparation method thereof

A technology of fumed silica and dams, applied in adhesives, dyed organosilicon compound treatment, fibrous fillers, etc., can solve the problems of difficult sizing, poor wettability of substrates, poor bonding of substrates, etc., and achieve destructive strength High, improved adhesion, good compatibility

Pending Publication Date: 2020-11-03
SHENZHEN SELEN SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a dam glue, which aims to solve the common problems of the existing dam glues such as high viscosity, difficulty in sizing, poor wettability with the base material, poor adhesion to the base material, poor compatibility with the surface glue and incompatibility. Conducive to room temperature storage and other issues

Method used

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  • Dam adhesive and preparation method thereof, and fumed silica and preparation method thereof
  • Dam adhesive and preparation method thereof, and fumed silica and preparation method thereof
  • Dam adhesive and preparation method thereof, and fumed silica and preparation method thereof

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preparation example Construction

[0048] The embodiment of the present invention also provides a kind of preparation method of said dam glue, comprising:

[0049] 30-50 parts of vinyl silicone oil with a viscosity of 50,000-120,000 mPa.s and 5-20 parts of modified fumed silica are placed in a vacuum state and mixed to obtain the first base rubber;

[0050] Put the first rubber base, 5-40 parts of vinyl silicone oil with a viscosity of 100-50000 mPa.s, 0.1-2 parts of initiator and 10-50 parts of silicone resin in a high-speed shear mixer, shear and mix, Get component A;

[0051] Put 30-50 parts of vinyl silicone oil with a viscosity of 50,000-120,000 mPa.s and 5-20 parts of modified fumed silica in a vacuum state, and mix them to obtain the second base rubber;

[0052] The second rubber base and 10-40 parts of hydrogen-containing silicone oil, 0.1-2 parts of binder, 0.01-2 parts of thixotropic agent, 5-20 parts of silicone resin and 5-40 parts of silicone resin have a viscosity of 100-50000mPa.s Place the vin...

Embodiment 1～10

[0077] The preparation of embodiment 1~10 modified fumed silica

[0078] S1: Soak fumed silica with hydrochloric acid solution under heating conditions;

[0079] S2: Rinse the fumed silica soaked in step S1 repeatedly with pure water, adjust the pH to 7, and dry it to obtain pretreated fumed silica;

[0080] S3: The pretreated fumed silica obtained in step S2 is placed under the vapor of a siloxane coupling agent to contact and react in a fluidized bed to obtain modified fumed silica.

[0081] Wherein, the heating temperature in step S1 is 30°C-80°C; the mass percentage of HCl in the hydrochloric acid solution is 5%-25%; the soaking time is 1h-8h.

[0082] Wherein, the baking time in step S3 is 30min to 120min; the siloxane coupling is a vinylsilane coupling agent, specifically tetramethyltetravinylcyclotetrasiloxane, hexamethylhexavinylcyclohexasiloxane One or more of alkane, vinyltriethoxysilane, vinyltrimethoxysilane, vinyltris(β-methoxyethoxy)silane, vinyltriacetoxysilan...

Embodiment 11～20、 comparative example 1

[0090] The preparation of embodiment 11~20, comparative example 1~2 dam glue

[0091] Preparation of component A:

[0092](a1) Put 30-50 parts of vinyl silicone oil with a viscosity of 100000mPa.s and 5-20 parts of modified fumed silica in a vacuum state, mix at high speed, and then continue to ultrasonicate the mixed product in a vacuum state Treat for 5-15 minutes to obtain the base rubber;

[0093] (a2) Take the base rubber obtained in step (a1), 5-40 parts of vinyl silicone oil with a viscosity of 100-50000mPa.s, 0.1-2 parts of initiator and 10-50 parts of silicone resin in a high-speed shear mixer , shear and mix to obtain component A;

[0094] Preparation of component B:

[0095] (b1) Put 30-50 parts of vinyl silicone oil with a viscosity of 100000mPa.s and 5-20 parts of modified fumed silica in a vacuum state, mix at high speed, and then continue to sonicate the mixed product in a vacuum state Treat for 5-15 minutes to obtain the base rubber;

[0096] (b2) Take the...

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Abstract

The invention is applicable to the field of high polymer materials, and provides dam adhesive, a preparation method of the dam adhesive, fumed silica and a preparation method of the fumed silica. Thedam adhesive includes a component A and a component B, wherein the component A is prepared from 30 to 50 parts of vinyl silicone oil, 5 to 40 parts of vinyl silicone oil, 10 to 50 parts of silicon resin, 5 to 20 parts of modified fumed silica and 0.1 to 2 parts of photoinitiator; the component B comprises the following components in parts by weight: 30-50 parts of vinyl silicone oil, 5-40 parts ofvinyl silicone oil, 10-40 parts of hydrogen-containing silicone oil, 5-20 parts of modified fumed silica, 5-20 parts of silicon resin, 0.1-2 parts of an adhesive and 0.01-2 parts of a thixotropic agent; during use, the component A and the component B are mixed according to the weight ratio of 1 : (0.8-1.2). The dam dam adhesive has the advantages of moderate viscosity, low curing temperature, easiness in application, good compatibility with a base material and an organic silicon liquid optical adhesive and the like, can be stored at normal temperature and has good storage stability.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a dam glue and a preparation method thereof. Background technique [0002] Liquid dam glue is easy to apply, and can be widely used in the packaging of LED lamp beads, photoelectric displays, liquid crystal displays and other fields according to the shape of the coating, mainly to prevent the liquid optical glue from flowing to the components and the periphery when bonding different components. , to protect the components. [0003] The existing dam adhesives on the market are dazzling, with uneven layers. Although the curing temperature is low and fast to a certain extent, and has excellent mechanical properties, the general viscosity is relatively high, basically higher than 70000mPa·s, and the thixotropic index is 3. Between ~5, there are disadvantages such as difficulty in sizing, poor wettability with the substrate, poor adhesion to the substrate, and p...

Claims

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Application Information

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IPC IPC(8): C09J183/07C09J183/05C09J183/04C09J11/04C09C1/30C09C3/12
CPCC08L2205/025C08L2205/035C09C1/3081C09J11/04C09J183/04C08L83/04C08K9/06C08K7/26
Inventor 丁远家张利利李志才
Owner SHENZHEN SELEN SCI & TECH CO LTD
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