How to improve the adhesion of silicone resins 10

There are many factors that affect the bonding performance of the material, such as: the chemical composition and interface properties of the bonded material, the chemical composition of the adhesive material used, the interaction with the bonded material, its own strength, etc. Therefore, these factors need to be considered when choosing an adhesive to bond different materials.

Similarly, the adhesion of silicone resin also needs to pay attention to the above issues, since you did not indicate the specific material to be bonded, nor did you specify the specific type of silicone resin, I can only give you a general introduction to the problems that need to be paid attention to to improve the adhesion of silicone resin

1.The influence of the structure of silicone resin, silicone resin includes: methyl silicone resin, methyl phenyl silicone resin, and even propyl silicone resin, etc., the organic groups in different silicone resins have certain differences in the adhesion performance of the material, and the content of different organic groups and the structure of silicone resin will also have an impact on the adhesion performance of the material;

2.The composition and interface properties of the bonded materials, such as bonded polyolefin materials, fluorine-containing materials, inorganic materials, metal materials, etc., will lead to relatively large differences in bond strength due to differences in their chemical composition and interface structure, some materials are easy to bond, and some materials are difficult to bond (not detailed).

Sometimes it is even necessary to introduce special functional groups into the structure of the binder to improve the bonding properties of the interface;

3.In many cases, the surface of the material needs to be treated with some special treatment, such as oxidation treatment to improve surface activity, plasma treatment, silane coupling agent treatment, etc., and even surface modification of the material.

4.The adjustment of the formula composition of the binder material, such as the ratio of cross-linking reaction groups and catalysts, needs to be investigated to obtain a binder formula with a reasonable ratio;

5.In addition, some tackifying additives and reinforcing materials may need to be added to many adhesive materials, which need to be paid attention to when making adhesive formulations;

6.The curing conditions of the adhesive material, which is also a very important factor affecting the bond strength, should be carefully investigated, including the curing temperature, time, pressure, etc., to find the best process conditions, otherwise it will lead to a serious decrease in the bonding strength of the material.

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Add a small amount of silane coupling agent.

Summary. 1.Gas-phase silica should be nano-scale, which has little impact on transparency;

2.To increase toughness, it is generally necessary to add silicone oil, and the simple resin will be too rigid, and it will be better to use the compound in general, you can consider adding a small amount of high vinyl silicone resin, and at the same time use a small amount of side chain vinyl silicone oil;

3.Add the corresponding MQ resin according to the type of silicone you have.

How to make silicone resin glue harder.

1.Gas-phase silica should be nano-scale, which has little impact on transparency; 2.To increase toughness, it is generally necessary to add silicone oil, and the simple resin will be too rigid, and it will be better to use the compound in general, you can consider adding a small amount of high vinyl silicone resin, and at the same time use a small amount of side chain vinyl silicone oil; 3.

Add the corresponding MQ resin according to the type of silicone you have.

Is there any data on how much this is generally added?

This depends on the actual situation.

General resin refers to organic components that can be softened or flowed after heating, and are mostly semi-solid and solid at room temperature. Broadly speaking, resins can refer to all polymers that are processed from plastics, especially chemicals. Resin itself is also one of the raw materials for making plastics, and it can be said that resin has a wide range of applications.

The silicone resin mentioned here refers to a very special kind of resin, also known as a highly cross-linked mixture. After it is hydrolyzed, the initial form is annular, which can be obtained after further condensation. 

First, the process application of silicone resin

1. Production process:

Silicone is a plastic that is very stable when heated, and its most outstanding property is its excellent thermal oxidation stability. After 24 hours of 250 degrees Celsius, the silicone loser weighs only 2% of its own weight. Another excellent property of silicone is its excellent insulation.

The dielectric constant of a typical resin is less than 3, while silicone can easily achieve it. In addition, silicone resin has strong moisture resistance, water resistance, odor and rust resistance, and will not be easily corroded, the only less ideal is that its dissolution resistance is too poor.

2. Application field

Due to the properties of all the silicone resins above, it is mainly used as an insulating varnish, including varnishes and enamels. And use it to soak glass cloth and asbestos cloth, etc., and then make it into a casing and insulation group of the motor. In this case, the general high-voltage motor needs such a main insulator.

And it can also be made into heat-resistant anti-corrosion coatings and release agents, etc.

2. Composite materials of silicone resin

1. Glass paint cloth. Soak the glass paint cloth with silicone resin and dry it. This allows it to be used as a wrapping insulating material for electrical appliances and motors.

2. Laminated plastic. Glass lacquer cloth soaked in silicone is layered on top of each other and molded with high pressure. The finished product can be used for a long time in temperatures below 250 °C, but can also be used if the temperature reaches 300°C for a short period of time.

3. Molded plastic. Silicone resins are also used, which can reach an instantaneous temperature of 650 °C, and are now widely used in aerospace and aeronautics.

Today, I will explain to you what resin is, and I will also compare ordinary resin with silicone resin. In general, silicone resins are superior in performance and are also suitable for some aerospace products. As we all know, an airplane is a very delicate object, and a problem with one of the macroscopic screws in it may cause the entire aircraft to fall into a state of no return.

This requires a high quality of the material. Therefore, the conventional resin materials could not be applied to this related industry, but after technological innovation, silicone resin has also ushered in its own era.

You can get it for free

Silicone resin has long-temperature self-drying type and high temperature curing type, in order to accelerate curing, a small amount of diethylenetriamine or triethylenetetraamine can be added, the paint film gradually begins to harden even if it begins to cure, diethylenetriamine or triethylenetetraamine is only used as a drier in very small amounts, and it is best to determine the dosage through practice. High-temperature curing generally volatilizes the solvent at a lower temperature, then dries at 160-180 degrees, and finally cures at a high temperature of 220.

It is a highly cross-linked network structure of polyorganosiloxane, usually with methyl trichlorosilane, dimethyl dichlorosilane, phenyltrichlorosilane, diphenyldichlorosilane or methylphenyldichlorosilane various mixtures, in the presence of organic solvents such as toluene, hydrolysis at a lower temperature to obtain acidic hydrolysate. The initial product of hydrolysis is a mixture of cyclical, linear and cross-linked polymers, which also usually contain a considerable amount of hydroxyl groups. The hydrolysate is washed with water to remove the acid, and the neutral primary condensation polymer is thermally oxidized in air or further polycondensation in the presence of a catalyst to form a highly cross-linked three-dimensional network structure.

Generally, BPO or bis-two-four, the viscosity is reduced, and the internal fusion is large, which means that it has begun to cure.

Summary. Pro, the curing agent of silicone resin can choose organotin compounds, platinum complexes, amino gases, acid resins, etc. Each hardener has its own circumstances and characteristics.

Organotin compounds are one of the commonly used curing agents for silicone resins, such as diethyl stannate and powdered organotinate. They are characterized by low cost, fast curing speed, and a wide range of curing temperatures. However, when using organotin compounds as curing agents, it is necessary to be aware of their possible toxicity and environmental contamination issues.

Pro, the curing agent of silicone resin can choose organotin compounds, platinum complexes, amino gases, acid resins, etc. Each hardener has its own circumstances and characteristics. Organotin compounds are one of the commonly used curing agents for organosilicon resins, such as diethystannate and powder hall hand organotinate.

They are characterized by low cost, fast curing speed, and wide range of curing temperatures. However, when using organotin compounds as curing agents, it is necessary to be aware of their possible toxicity and environmental contamination issues.

Platinum complexes are advanced curing agents for silicone resins, such as ethylenediamine platinum salts, platinum dicene, etc. The platinum complex has an excellent fixation and cavitation effect, can quickly cure the silicone resin at a lower temperature, and the cured product has high stability and heat resistance. However, platinum complexes are more expensive and cost to use.

Ammonia gases are a class of metal catalysts with pure cavities, such as ammonia. This curing agent has the characteristics of fast curing speed and long operation time, and is suitable for situations that require fast closing and fast curing.

However, when using amino gas curing agents, it is necessary to pay attention to the safety of storage and use to avoid the danger caused by ammonia leakage.

There are also acid resins that are a class of acid catalysts, such as sulfuric acid, hydrogen fluoric acid, etc. Acid resins have a wider curing temperature range and longer operating time than other hardeners. At the same time, acid resins are relatively inexpensive, but they also need to pay attention to safety and environmental protection when operating chain bonds.

In short, the choice of a curing agent for silicone resin requires a comprehensive consideration of various factors according to the specific needs and applications

Hello dear <>, the specific answer to your question is as follows: how to improve the adhesion of epoxy tree reputation grease adhesive on polysilicon has the following points: 1

Improve surface roughnessWhen the adhesive is well infiltrated on the surface of the adherent material (contact angle <90°), the roughening of the surface is conducive to improving the wetting degree of the adhesive liquid on the surface, increasing the density of the contact point between the adhesive and the adherent material, which is conducive to Qingji to improve the bonding strength. 2.Surface treatment due to the existence of oxide layer (such as rust), chrome plating layer, phosphating layer, release agent, etc. of the adherent material formed by the "weak boundary layer", the surface treatment of the adherent will affect the bonding strength, the surface treatment of aluminum and aluminum alloy, it is hoped that the aluminum surface will generate alumina crystals, and the natural oxidized aluminum surface is very irregular, quite loose alumina layer, which is not conducive to bonding.

3.Penetrating bonded joints, affected by the ambient atmosphere, are often infiltrated into some other low molecules. For example, when the joint is in a humid environment or under water, water molecules penetrate into the adhesive line; The polymer adhesive layer is in an organic solvent, the solvent molecules penetrate into the polymer, and the penetration of low molecules first deforms the adhesive layer, and then enters the interface between the adhesive layer and the adherent?

Reduces the strength of the adhesive line, which leads to the destruction of the bond. 4.Migration of plasticizer-containing adhesive materials is prone to migration from the polymer surface or interface due to the poor compatibility of these small molecules with polymer macromolecules.

If the migrated small molecules accumulate at the interface, they can prevent the adhesive from bonding to the material to be adhered to, resulting in bond failure. I hope I can help you late, if you are satisfied with my service, please give a thumbs up, I wish you all the best!