A silicone surface treatment agent with low climbing and its preparation method

Abstract

This application relates to the technical field of silicone surface treatment agents, and specifically discloses a silicone surface treatment agent with low creep and its preparation method. The silicone surface treatment agent is made from a prepolymer, an organic solvent, and a curing agent with a weight ratio of 100:(300 - 500):(5 - 8); the prepolymer is mainly made from the following raw materials in parts by weight: 700 parts of an organic solvent, 800 - 1000 parts of hydroxy silicone oil, 50 - 1000 parts of hydroxy silicone resin, 5 - 30 parts of tetraethyl orthosilicate, 1 - 5 parts of butyl titanate, 0.5 - 2 parts of a basic catalyst, and 0.1 - 1 part of a neutralizing agent. This silicone surface treatment agent is applied between silicone rubber and single / double-sided pressure-sensitive adhesives, and the bonding strength is between 10 - 500 g / 25 mm, that is, it can maintain stable bonding. Moreover, the 24-hour bonding strength creep rate < 9%, having the advantages of a low bonding strength creep rate and good stability.

Description

Technical Field

[0001] This application relates to the technical field of silicone surface treatment agents, and more specifically, it relates to a silicone surface treatment agent with low climb and its preparation method. Background Art

[0002] With the progress of technology, productivity has been rapidly improved, and the demand for silicone surface treatment agents has been increasing day by day. When laminating single / double-sided pressure-sensitive adhesives on the surface of silicone rubber, it is necessary to pre-coat a silicone surface treatment agent on the surface of the silicone rubber, then dry it, and then laminate the single / double-sided pressure-sensitive adhesive, and then perform subsequent operations on the silicone rubber, such as transportation. When the single / double-sided pressure-sensitive adhesive is peeled off, if the adhesion strength is too small, it is easy to have the situation of non-adhesion; if the adhesion strength is too large or the adhesion strength climb rate is too fast, it is easy to have the situation of tearing the silicone rubber. Therefore, it is required that the adhesion strength is within a certain range, too small or too large will increase the process difficulty.

[0003] For the silicone surface treatment agents on the market, their raw materials include organic solvents, silicone oil, silicone resin, and curing agents. The raw materials are mixed to obtain the silicone surface treatment agent. However, for the silicone surface treatment agent obtained by this method, after it is applied to silicone rubber and single / double-sided pressure-sensitive adhesives, after 168h, the adhesion strength climb rate > 50%, and the adhesion strength climbs too fast, which is easy to have the situation of excessive adhesion strength and tearing the silicone rubber. Summary of the Invention

[0004] In order to reduce the adhesion strength climb rate and increase stability, this application provides a silicone surface treatment agent with low climb and its preparation method.

[0005] In the first aspect, this application provides a silicone surface treatment agent with low climb, adopting the following technical solution: A silicone surface treatment agent with low climb, which is made of a prepolymer, an organic solvent, and a curing agent. The weight ratio of the prepolymer, the organic solvent, and the curing agent is 100:(300 - 500):(5 - 8);

[0006] The prepolymer is mainly made of the following raw materials in parts by weight: 700 parts of organic solvent, 800 - 1000 parts of hydroxy silicone oil, 50 - 1000 parts of hydroxy silicone resin, 5 - 30 parts of ethyl silicate, 1 - 5 parts of tetrabutyl titanate, 0.5 - 2 parts of basic catalyst, and 0.1 - 1 part of neutralizing agent.

[0007] The silicone surface treatment agent of the present application is applied between silicone rubber and single / double-sided pressure-sensitive adhesive, and always maintains good adhesive strength. The adhesive strength is between 10 - 500 g / 25 mm, that is, it can maintain stable adhesion and does not tear the silicone rubber. At the same time, the adhesive strength climbing rate within 24 h < 9%, and the adhesive strength climbing rate within 168 h is still < 9%. It has the advantages of low adhesive strength climbing rate and good stability, meeting the market demand.

[0008] For the silicone surface treatment agent of the present application, a prepolymer is added to the raw materials, and tetrabutyl titanate is added to the raw materials of the prepolymer, which can react with some hydroxyl groups in hydroxyl silicone oil / hydroxyl silicone resin. Ethyl polysilicate is added to the raw materials, which can react with the hydroxyl groups of hydroxyl silicone oil / hydroxyl silicone resin under an alkaline catalyst. The prepolymer of the present application grafts tetrabutyl titanate and ethyl polysilicate onto hydroxyl silicone oil / hydroxyl silicone resin, effectively increasing the amount of branches of hydroxyl silicone oil / hydroxyl silicone resin and improving the viscosity of the silicone surface treatment agent.

[0009] At the same time, a neutralizing agent is added to the raw materials of the prepolymer, which can react with the alkaline catalyst to interrupt crosslinking and increase the stability of the prepolymer, thereby increasing the stability of the silicone surface treatment. A curing agent is added to the raw materials of the silicone surface treatment agent, which can further react and crosslink and cure when contacting the prepolymer, enhancing the adhesive strength of the silicone surface treatment agent. An organic solvent is added to the raw materials of the silicone surface treatment agent, which mainly plays a diluting role, reducing the contact between the prepolymer and the curing agent, thereby reducing the curing of the silicone surface treatment agent and facilitating the storage and use of the silicone surface treatment agent.

[0010] When the silicone surface treatment agent of the present application is coated on the surface of a substrate, the organic solvent in the silicone surface treatment agent volatilizes, and the prepolymer and the curing agent contact and react, adhering to the surface of the substrate and forming a three-dimensional structure with a network of multi-branches on the surface of the substrate, and forming a silicone film on the surface of the substrate. The silicone film is prone to generate van der Waals forces or hydrogen bonds with the double-sided adhesive, and does not form covalent bonds to damage the substrate. It is suitable for the pretreatment of silicone substrates, rubber substrates, and metal substrates, and is also suitable for the adhesion between substrates and single / double-sided pressure-sensitive adhesives, having the advantage of strong adaptability. Especially when applied to electronic products, it can transfer and attach the electronic products to fixed positions, and because the adhesive strength climbing rate is small and the stability is good, when peeling, it basically does not drive the electronic products to shift, facilitating use.

[0011] At the same time, after the silicone surface treatment agent is coated on the surface of the substrate, it can be cured by standing at room temperature for 3 - 5 min or standing at a temperature of 80 - 100 °C for 30 - 120 s, and then the single / double-sided pressure-sensitive adhesive is laminated. The curing time is short, shortening the process. Moreover, the raw material cost of the silicone surface treatment agent is low, the reaction is simple, easy to control, and it can be mass-produced, having economic value.

[0012] Optionally, the hydroxyl content of the hydroxyl silicone oil is 0.06 - 0.2%, and the kinematic viscosity is 20,000 - 200,000 mPa·s; the mass content of C8H 20 O4Si in the tetraethyl orthosilicate is 1 - 10%.

[0013] By adopting the above technical solution, the hydroxyl content and kinematic viscosity of the hydroxyl silicone oil are limited, and the content of C8H 20 O4Si in the tetraethyl orthosilicate is limited, which is convenient for the reaction of the hydroxyl silicone oil / hydroxyl silicone resin with butyl titanate and tetraethyl orthosilicate.

[0014] Optionally, the hydroxyl content of the hydroxyl silicone resin is 0.8 - 2%, and the number-average molecular weight is 5,000 - 10,000 g / mol.

[0015] By adopting the above technical solution, the hydroxyl content and number-average molecular weight of the hydroxyl silicone resin are limited, which is convenient for the selection of the hydroxyl silicone resin.

[0016] Optionally, the basic catalyst is a sodium hydroxide solution, and the mass concentration of the sodium hydroxide solution is 5 - 15%;

[0017] The neutralizing agent is a hydrochloric acid solution, and the mass concentration of the hydrochloric acid solution is 5 - 15%.

[0018] By adopting the above technical solution, the basic catalyst is limited, which is convenient for the selection of the basic catalyst. The neutralizing agent is also limited, which is convenient for the selection of the neutralizing agent. At the same time, the raw materials of the sodium hydroxide solution and the hydrochloric acid solution are rich and easy to obtain.

[0019] In multiple embodiments, the mass concentration of the sodium hydroxide solution is 10%, and it can also be set to 5%, 7%, 12%, 15%, etc. according to needs. In multiple embodiments, the mass concentration of the hydrochloric acid solution is 10%, and it can also be set to 5%, 7%, 12%, 15%, etc. according to needs.

[0020] Optionally, the prepolymer is prepared by the following method: mixing an organic solvent, hydroxyl silicone oil, hydroxyl silicone resin, and tetraethyl orthosilicate, adding butyl titanate and mixing, heating to 90 - 110°C, adding a basic catalyst and mixing, adding a neutralizing agent and mixing, evacuating, standing, and filtering to obtain the prepolymer.

[0021] By adopting the above technical solution, an organic solvent, hydroxyl silicone oil, hydroxyl silicone resin, and tetraethyl orthosilicate are pre-mixed, and then tetrabutyl titanate is added. At this time, tetrabutyl titanate reacts with hydroxyl silicone oil / hydroxyl silicone resin. Then, the temperature is raised, and a basic catalyst is added to cause tetraethyl orthosilicate to react with hydroxyl silicone oil / hydroxyl silicone resin. Adding the basic catalyst after raising the temperature does not interfere with the reaction between tetrabutyl titanate and hydroxyl silicone oil / hydroxyl silicone resin, realizing the step-by-step grafting of tetrabutyl titanate and tetraethyl orthosilicate, which facilitates the control of prepolymer grafting. Finally, a neutralizing agent is added, and the neutralizing agent reacts with the basic catalyst to make the basic catalyst ineffective, interrupting crosslinking and increasing the stability of the prepolymer. At the same time, combined with vacuum treatment, low-molecular substances can be effectively removed, the volatiles of the prepolymer can be reduced, and the stability of the prepolymer can be increased.

[0022] Optionally, in the prepolymer preparation method, the addition method of tetrabutyl titanate is dropwise addition, and the dropwise addition time is 0.5 - 1.5 h; the addition method of the basic catalyst is dropwise addition, and the dropwise addition time is 2 - 3 h;

[0023] The addition method of the neutralizing agent is dropwise addition, and the dropwise addition time is 0.5 - 1.5 h.

[0024] By adopting the above technical solution, tetrabutyl titanate is added dropwise, which facilitates its reaction with hydroxyl silicone oil / hydroxyl silicone resin. The basic catalyst is added dropwise, which facilitates its catalysis of the reaction between tetraethyl orthosilicate and hydroxyl silicone oil / hydroxyl silicone resin. The neutralizing agent is added dropwise, which facilitates its reaction with the basic catalyst. At the same time, it can also increase the uniformity of raw material mixing and the stability of prepolymer preparation.

[0025] Further, the prepolymer is prepared by the following method: at a rotation speed of 150 - 180 rpm, an organic solvent, hydroxyl silicone oil, hydroxyl silicone resin, and tetraethyl orthosilicate are mixed, tetrabutyl titanate is added and mixed, the temperature is raised to 90 - 110 °C, the rotation speed is adjusted to 200 - 300 rpm, a basic catalyst is added and mixed, a neutralizing agent is added and mixed, vacuum is applied, and then it is allowed to stand and filtered to obtain the prepolymer.

[0026] Optionally, the curing agent is one or more of diethylenetriamine, triethylenetetramine, and hydroxyethyl ethylenediamine.

[0027] Optionally, the curing agent is a mixture of diethylenetriamine, triethylenetetramine, and hydroxyethyl ethylenediamine, and the weight ratio of diethylenetriamine, triethylenetetramine, and hydroxyethyl ethylenediamine is 5:(1 - 3):(1 - 3).

[0028] By adopting the above technical solution, the curing agent is defined, which facilitates the selection of the curing agent.

[0029] Optionally, the organic solvent is one or more of hexamethyldisiloxane, white spirit, and xylene.

[0030] By adopting the above technical solution, the organic solvent is defined, which is convenient for the selection of the organic solvent. Moreover, hexamethyldisiloxane, white spirit, and xylene have fast volatilization and small odor, which are convenient for the coating and curing of the silicone surface treatment agent, and shorten the process.

[0031] In a second aspect, the present application provides a preparation method of the above-mentioned silicone surface treatment agent with low creep, adopting the following technical solution:

[0032] A preparation method of the above-mentioned silicone surface treatment agent with low creep includes the following steps: mixing a prepolymer and an organic solvent, and adding a curing agent for mixing to obtain the silicone surface treatment agent.

[0033] By adopting the above technical solution, it is convenient for the preparation of the silicone surface treatment agent.

[0034] To sum up, the present application has at least the following beneficial effects:

[0035] 1. The silicone surface treatment agent of the present application is applied between silicone rubber and single / double-sided pressure-sensitive adhesive, and the bonding strength is between 10 - 500 g / 25 mm. That is, it can maintain stable bonding, and there is no situation of tearing the silicone rubber. At the same time, the bonding strength creep rate within 24 h < 9%, and the bonding strength creep rate within 168 h is still < 9%. It has the advantages of low bonding strength creep rate and good stability, meeting the market demand.

[0036] 2. The silicone surface treatment agent of the present application has low raw material cost, simple reaction, easy control, can be mass-produced, and has economic value. Moreover, when it is coated on the surface of the substrate, it can be cured by standing at room temperature for 3 - 5 min, or standing at a temperature of 80 - 100 °C for 30 - 120 s. The curing time is short, shortening the process. At the same time, the silicone surface treatment agent can form a three-dimensional structure with a network of multi-branched chains on the surface of the substrate, that is, form a silicone film. The silicone film is easy to generate van der Waals forces or hydrogen bonds with the double-sided adhesive, and does not form covalent bonds to damage the substrate. It is suitable for the pretreatment of silicone substrates, rubber substrates, and metal substrates, and is also suitable for the bonding between substrates and single / double-sided pressure-sensitive adhesives, having the advantage of strong adaptability. Specific Embodiments

[0037] To make the present application easier to understand, the following will further describe the present application in detail in combination with embodiments. These embodiments are only illustrative and are not limited to the application scope of the present application. The raw materials or components used in the present application can be obtained through commercial channels or conventional methods without special instructions.

[0038] Preparation Examples

[0039] Table 1 Content of each raw material of the prepolymer (unit: g)

[0040]

[0041]

[0042] Preparation Example 1

[0043] A prepolymer, the raw materials and their ratios are shown in Table 1.

[0044] Among them, the organic solvent is xylene; the hydroxyl content of the hydroxyl silicone oil is 0.1% and the kinetic viscosity is 80000 mPa·s; the hydroxyl content of the hydroxyl silicone resin is 1.5% and the number-average molecular weight is 8000 g / mol; the molecular formula of tetraethyl orthosilicate is C 24 H 60 O 16 Si5, and the mass content of tetraethyl orthosilicate C8H 20 O4Si in tetraethyl orthosilicate is 5%; the basic catalyst is sodium hydroxide solution, and the mass concentration of the sodium hydroxide solution is 10%; the neutralizing agent is hydrochloric acid solution, and the mass concentration of the hydrochloric acid solution is 10%.

[0045] A preparation method of a prepolymer for an organosilicon surface treatment agent, comprising the following steps:

[0046] At a rotation speed of 160 rpm, add the organic solvent, hydroxyl silicone oil, hydroxyl silicone resin, and tetraethyl orthosilicate into the reaction kettle and stir for 10 min. Then add tetrabutyl titanate dropwise, and the dropping time of tetrabutyl titanate is 0.75 h. Then raise the temperature to 100 °C, adjust the rotation speed to 250 rpm, add the basic catalyst dropwise, and the dropping time of the basic catalyst is 2.5 h. Then add the neutralizing agent dropwise, and the dropping time of the neutralizing agent is 0.75 h. After the dropping is completed, stir for 5 min. Then evacuate, stand for 4 h, and filter to obtain the prepolymer.

[0047] Preparation Example 2

[0048] A prepolymer, the difference from Preparation Example 1 is that the raw material ratio of the prepolymer is different, and the raw material ratio of the prepolymer is shown in Table 1.

[0049] Preparation Example 3

[0050] A prepolymer, the difference from Preparation Example 1 is that the raw material ratio of the prepolymer is different, and the raw material ratio of the prepolymer is shown in Table 1.

[0051] Preparation Example 4

[0052] A prepolymer, the difference from Preparation Example 1 is that the raw material ratio of the prepolymer is different, and the raw material ratio of the prepolymer is shown in Table 1.

[0053] Examples

[0054] Table 1 Raw material contents of silicone surface treatment agent (unit: g)

[0055]

[0056]

[0057] Example 1

[0058] A silicone surface treatment agent with low climbing property, the raw materials and their proportioning are shown in Table 2.

[0059] Among them, the organic solvent is a mixture of hexamethyldisiloxane and xylene, and the weight ratio of hexamethyldisiloxane to xylene is 3:7; the curing agent is a mixture of diethylenetriamine, triethylenetetramine, and hydroxyethyl ethylenediamine, and the weight ratio of diethylenetriamine, triethylenetetramine, and hydroxyethyl ethylenediamine is 5:2:2; the prepolymer is obtained by using Preparation Example 1.

[0060] A preparation method of a silicone surface treatment agent with low climbing property, comprising the following steps:

[0061] At a rotation speed of 250 rpm, add the prepolymer and the organic solvent into a disperser, stir for 30 min, add the curing agent, and stir for 30 min to obtain the silicone surface treatment agent.

[0062] Example 2

[0063] A silicone surface treatment agent with low climbing property, the difference from Example 1 is that the raw material proportioning of the silicone surface treatment agent is different, and the raw material proportioning of the silicone surface treatment agent is shown in Table 2.

[0064] Example 3

[0065] A silicone surface treatment agent with low climbing property, the difference from Example 1 is that the raw material proportioning of the silicone surface treatment agent is different, and the raw material proportioning of the silicone surface treatment agent is shown in Table 2.

[0066] Example 4

[0067] A silicone surface treatment agent with low climbing property, the difference from Example 1 is that among the raw materials of the silicone surface treatment agent, the source of the prepolymer is different, and the prepolymer is obtained by using Preparation Example 2.

[0068] Example 5

[0069] A silicone surface treatment agent with low climbing property, the difference from Example 1 is that among the raw materials of the silicone surface treatment agent, the source of the prepolymer is different, and the prepolymer is obtained by using Preparation Example 3.

[0070] Example 6

[0071] A low-climbing silicone surface treatment agent, the difference from Example 1 is that in the raw materials of the silicone surface treatment agent, the source of the prepolymer is different, and the prepolymer is obtained by using Preparation Example 4.

[0072] Comparative Example

[0073] Comparative Example 1

[0074] A low-climbing silicone surface treatment agent, the difference from Example 1 is that in the raw materials of the prepolymer, an equal amount of hydroxyl silicone oil is used to replace tetraethyl orthosilicate and butyl titanate.

[0075] Comparative Example 2

[0076] A low-climbing silicone surface treatment agent, the difference from Example 1 is that in the raw materials of the prepolymer, an equal amount of tetraethyl orthosilicate is used to replace butyl titanate.

[0077] Comparative Example 3

[0078] A low-climbing silicone surface treatment agent, the difference from Example 1 is that in the raw materials of the prepolymer, an equal amount of butyl titanate is used to replace tetraethyl orthosilicate.

[0079] Performance Detection

[0080] Respectively take the silicone surface treatment agents obtained in Examples 1-6 and Comparative Examples 1-3, and then coat them on the surface of the silicone rubber substrate, let stand for 10 min, and the silicone surface treatment agent cures to form a silicone film. Then, a single-sided pressure-sensitive adhesive is bonded to the surface of the silicone film, and under a pressure of 3 MPa, it is pressed for 4 h to obtain a specimen, and let stand for 168 h. And the specimen is subjected to 180-degree peeling to detect the bonding strength, and the bonding strength climbing rate is calculated. The detection results are shown in Tables 3 and 4.

[0081] Among them, the bonding strength climbing rate / (%) = (bonding strength - initial bonding strength) / initial bonding strength × 100%.

[0082] Table 3 Detection Results of Bonding Strength and Peeling

[0083]

[0084] Table 4 Detection Results of Bonding Strength Climbing Rate

[0085]

[0086]

[0087] As can be seen from Table 3 and Table 4, the silicone surface treatment agent of the present application, when applied to the silicone rubber product obtained between the silicone rubber and the single / double-sided pressure-sensitive adhesive, has good initial adhesion strength, and the adhesion strength is 10 - 500 g / 25 mm. Moreover, after 24 hours, the adhesion strength climbing rate after 24 hours is 8.1 - 8.7%. After 168 hours, the adhesion strength climbing rate after 168 hours is 8.4 - 8.9%, and the adhesion strength climbing rate is small and the stability is good. That is, the silicone surface treatment agent of the present application, after being applied to the silicone rubber and the single / double-sided pressure-sensitive adhesive, always maintains good adhesion strength, and the adhesion strength is between 10 - 500 g / 25 mm, that is, it can maintain stable adhesion, and also has the advantages of low adhesion strength climbing rate and good stability, meeting the market demand.

[0088] Compare Example 1 with Comparative Examples 1 - 3. For the silicone surface treatment agent of Comparative Example 1, ethyl polysilicate and butyl titanate were not added to its raw materials; compared with Comparative Example 1, ethyl polysilicate was added to the raw materials of the silicone surface treatment agent in Comparative Example 2; compared with Comparative Example 1, butyl titanate was added to the raw materials of the silicone surface treatment agent in Comparative Example 3; compared with Comparative Example 1, ethyl polysilicate and butyl titanate were added to the raw materials of the silicone surface treatment agent in Example 1. It can be seen from this that adding ethyl polysilicate and butyl titanate simultaneously to the raw materials of the silicone surface treatment agent can not only increase the initial adhesion strength, but also significantly reduce the adhesion strength climbing rate after 24 hours and greatly improve the stability, showing better use effects.

[0089] It should be noted that the above-described embodiments are only used to explain the present application and do not constitute any limitation to the present application. The present application has been described by referring to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words, rather than limiting words. Modifications can be made to the present application within the scope of the claims of the present application as stipulated, and the present invention can be revised without departing from the scope and spirit of the present application. Although the present application described therein relates to specific methods, materials and embodiments, it does not mean that the present application is limited to the specific examples disclosed therein. On the contrary, the present application can be extended to all other methods and applications with the same functions.

Claims

1. A silicone surface treatment agent with low creepage, characterized in that: It is made of a prepolymer, an organic solvent, and a curing agent, and the weight ratio of the prepolymer, the organic solvent, and the curing agent is 100:(300 - 500):(5 - 8); The prepolymer is mainly made of the following raw materials in parts by weight: 700 parts of an organic solvent, 800 - 1000 parts of hydroxy silicone oil, 50 - 1000 parts of hydroxy silicone resin, 5 - 30 parts of tetraethyl orthosilicate, 1 - 5 parts of butyl titanate, 0.5 - 2 parts of a basic catalyst, and 0.1 - 1 part of a neutralizing agent; The hydroxy silicone oil has a hydroxy content of 0.06 - 0.2% and a kinematic viscosity of 20000 - 200000 mPa·s; The mass content of C8H 20 O4Si in the ethyl polysilicate is 1-10%; The hydroxy silicone resin has a hydroxy content of 0.8 - 2% and a number-average molecular weight of 5000 - 10000 g / mol; The basic catalyst is a sodium hydroxide solution, and the mass concentration of the sodium hydroxide solution is 5 - 15%; The neutralizing agent is a hydrochloric acid solution, and the mass concentration of the hydrochloric acid solution is 5 - 15%; The prepolymer is prepared by the following method: Mix the organic solvent, hydroxy silicone oil, hydroxy silicone resin, and tetraethyl orthosilicate, add butyl titanate and mix, heat up to 90 - 110°C, add the basic catalyst and mix, add the neutralizing agent and mix, evacuate, let stand, and filter to obtain the prepolymer; The curing agent is one or more of diethylenetriamine, triethylenetetramine, and hydroxyethyl ethylenediamine; The organic solvent is one or more of hexamethyldisiloxane, white spirit, and xylene.

2. The silicone surface treatment agent with low creepage according to claim 1, characterized in that: In the prepolymer preparation method, the butyl titanate is added dropwise, and the dropping time is 0.5 - 1.5 h; The basic catalyst is added dropwise, and the dropping time is 2 - 3 h; The neutralizing agent is added dropwise, and the dropping time is 0.5 - 1.5 h.

3. The silicone surface treatment agent with low creepage according to claim 1, characterized in that: The curing agent is a mixture of diethylenetriamine, triethylenetetramine, and hydroxyethyl ethylenediamine, and the weight ratio of diethylenetriamine, triethylenetetramine, and hydroxyethyl ethylenediamine is 5:(1 - 3):(1 - 3).

4. A preparation method of the silicone surface treatment agent with low creepage according to any one of claims 1-3, characterized in that: It includes the following steps: Mix the prepolymer and the organic solvent, add the curing agent and mix to obtain the silicone surface treatment agent.

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