CN113684000B - Double-component condensed type transparent pouring sealant and preparation method thereof - Google Patents
Double-component condensed type transparent pouring sealant and preparation method thereof Download PDFInfo
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- CN113684000B CN113684000B CN202110839214.8A CN202110839214A CN113684000B CN 113684000 B CN113684000 B CN 113684000B CN 202110839214 A CN202110839214 A CN 202110839214A CN 113684000 B CN113684000 B CN 113684000B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
- C09J183/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/10—Transparent films; Clear coatings; Transparent materials
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Abstract
The invention discloses a double-component condensed type transparent pouring sealant, which comprises a component A and a component B; the component A at least comprises: polysiloxanes, silicone oils; the component B at least comprises: silicone oil, silicate ester/methylsilane, auxiliaries, organotin salts. The pouring sealant prepared by the invention has good deep curing effect, cohesiveness, ultraviolet resistance and cracking resistance, curing is performed from inside to outside, the curing effect is better, and the pouring sealant is suitable for popularization in the field of pouring sealants and has wide development prospect.
Description
Technical Field
The invention relates to the field of pouring sealant, in particular to a double-component condensed type transparent pouring sealant and a preparation method thereof.
Background
Potting refers to a process operation of pouring liquid organic resin substances into empty slots or gaps filled with electronic components, circuits or devices mechanically or manually to form a cured product under normal temperature or light and high temperature conditions, and the organic resin substances are generally called potting adhesives and are commonly used for the protection of bonding, sealing, coating and the like of electronic components. The performance of the pouring sealant can be obviously different due to different raw material compositions.
In recent years, silicone potting adhesives have been increasingly used because of their excellent chemical stability and broad properties of adhesion, corrosion resistance, oxidation resistance, and the like. The organic silicon pouring sealant can be of a condensation type, an addition type or a plurality of types of single component and double component. The bi-component condensed pouring sealant has good cohesiveness, weather resistance, aging resistance and other properties, can save cost, has good stability, but has poor compatibility with moisture under the condition of no filler, and influences the transparency of the pouring sealant; moreover, some of the conventional two-component pouring sealants are subjected to a curing sequence extending from the outside to the inside, so that the deepened curing effect is very poor, and the application field of the pouring sealant is limited.
The prior art (CN201410296001.5) discloses a high-transparency and fast-deep-curing two-component condensed type organic silicon pouring sealant, which adopts auxiliary materials comprising hydroxyl-terminated polydimethylsiloxane, low-viscosity hydroxyl silicone oil, a cross-linking agent, a coupling agent and the like, and claims to have good transparency and deep-curing speed. However, the molecular water after dehydration condensation in the invention application is not stable enough, and the required amount of the cross-linking agent and the hydroxyl-terminated polydimethylsiloxane in the cross-linking reaction can not be completely met in the subsequent reaction, and the transparency and the curing efficiency of the pouring sealant product are easily reduced.
Therefore, it is a significant task to develop a two-component condensation type pouring sealant having excellent transparency and deep curing rate.
Disclosure of Invention
In order to solve the above problems, the invention provides a two-component condensed type transparent pouring sealant in a first aspect, which comprises a component A and a component B; the component A at least comprises: polysiloxanes, silicone oils; the component B at least comprises: silicone oil, silicate ester/methylsilane, auxiliaries, organotin salts.
As a preferable scheme, the component a at least comprises the following components in parts by weight: 80-120 parts of polysiloxane and 3-35 parts of silicone oil; the component B at least comprises the following components in parts by weight: 80-120 parts of silicone oil, 10-80 parts of silicate ester/methyl silane, 1-30 parts of an auxiliary agent and 0.5-10 parts of an organic tin salt.
In a preferred embodiment, the polysiloxane is at least one of hydroxy polydimethylsiloxane, vinyl methyl polysiloxane, vinyl polyborosiloxane, and hydrogen-terminated methyl phenyl polysiloxane.
In a preferred embodiment, the silicone oil is at least one of methyl silicone oil, hydrogen-containing silicone oil, diethyl silicone oil, and benzyl silicone oil.
As a preferable scheme, the viscosity of the polysiloxane is 100-30000 cps, and the temperature is 25 ℃; the viscosity of the silicone oil is 100-1000 cps at 25 ℃.
Preferably, the hydrogen content of the hydrogen-containing silicone oil is 0.1-1 wt%.
In a preferred embodiment, the auxiliary agent is at least one of an amino coupling agent, an epoxy coupling agent and an amino oligomer.
Preferably, the mass ratio of the amino coupling agent, the epoxy coupling agent and the amino oligomer is (1-1.5): (0.1-1.5): (0.1 to 1.5).
As a preferable scheme, the mass ratio of the component A to the component B is (15-25): (1-10).
The second aspect of the invention provides a preparation method of the double-component condensed type transparent pouring sealant, which comprises the following steps: (1) mixing the raw materials of the component A, uniformly stirring for 5-15 minutes at a dispersion speed of 5-30 Hz to obtain a component A mixed solution; (2) mixing the raw materials of the component B, and uniformly stirring for 5-15 minutes to obtain a component B mixed solution; (3) mixing the component A mixed solution and the component B mixed solution in proportion, and pumping to vacuum to obtain the product.
Has the advantages that:
1. the two-component condensed pouring sealant prepared in the application of the invention has excellent transparency and deep curing effect, can be deeply cured for more than 10 cm within 16 hours after use, and has the advantages of simple and easy preparation method, low raw material cost and excellent economic value.
2. The two-component condensed pouring sealant prepared in the application of the invention avoids the phenomena of poor cohesiveness, yellowing resistance and poor ultraviolet resistance effect of the existing two-component pouring sealant, does not generate the phenomena of yellowing and fogging or turbidity, and can keep good stability and transparency after being cured.
3. According to the two-component condensed pouring sealant prepared in the application, under the action of organic tin salt, the hydrogen-containing silicone oil and the hydroxyl silicone oil are subjected to a tight cross-linking reaction, the requirement on trace moisture in the preparation process of the condensed pouring sealant is reduced, and the deep-layer flowing and half-gel phenomena caused by short-time contact of no air moisture are avoided by compounding of polysiloxane with proper viscosity and the silicone oil, so that the quick self-leveling property and the air-out foaming property of the pouring sealant are finally ensured.
Detailed Description
The disclosure may be understood more readily by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
Approximating language, as used herein throughout the specification and claims, is intended to modify a quantity, such that the invention is not limited to the specific quantity, but includes portions that are literally received for modification without substantial change in the basic function to which the invention is related. Accordingly, the use of "about" to modify a numerical value means that the invention is not limited to the precise value. In some instances, the approximating language may correspond to the precision of an instrument for measuring the value. In the present description and claims, range limitations may be combined and/or interchanged, including all sub-ranges contained therein if not otherwise stated.
In addition, the indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the stated number clearly indicates that the singular form is intended.
In order to solve the above problems, the first aspect of the present invention provides a two-component condensed type transparent potting adhesive, comprising a component a and a component B; the component A at least comprises: polysiloxanes, silicone oils; the component B at least comprises: silicone oil, silicate ester/methylsilane, auxiliaries, organotin salts.
In some preferred embodiments, the a component comprises at least the following parts by weight: 80-120 parts of polysiloxane and 3-35 parts of silicone oil; the component B at least comprises the following components in parts by weight: 80-120 parts of silicone oil, 10-80 parts of silicate ester/methyl silane, 1-30 parts of an auxiliary agent and 0.5-10 parts of an organic tin salt.
In some preferred embodiments, the a component comprises at least the following parts by weight: 90-110 parts of polysiloxane and 5-25 parts of silicone oil; the component B at least comprises the following components in parts by weight: 90-110 parts of silicone oil, 30-60 parts of silicate ester/methyl silane, 5-15 parts of an auxiliary agent and 1-9 parts of an organic tin salt.
In some preferred embodiments, the polysiloxane is at least one of a hydroxy polydimethylsiloxane, a vinyl methyl polysiloxane, a vinyl polyborosiloxane, a hydrogen-terminated methylphenyl polysiloxane.
In some preferred embodiments, the silicone oil is at least one of methyl silicone oil, hydrogen-containing silicone oil, diethyl silicone oil, and benzyl silicone oil.
In some preferred embodiments, the polysiloxane has a viscosity of 100 to 30000cps, 25 ℃; the viscosity of the silicone oil is 100-1000 cps at 25 ℃.
In some preferred embodiments, the silicone oil has a viscosity of 200 to 400cps, 25 ℃.
In some preferred embodiments, the silicone oil is methyl silicone oil and hydrogen-containing silicone oil.
In some preferred embodiments, the polysiloxane is hydroxy polydimethylsiloxane.
In some more preferred embodiments, the polysiloxane is a mixture of hydroxy polydimethylsiloxane having a viscosity of 2000cps at 25 ℃ and hydroxy polydimethylsiloxane having a viscosity of 20000cps at 25 ℃; the viscosity is 2000cps, the viscosity of the hydroxy polydimethylsiloxane at 25 ℃ is 20000cps, the mass ratio of the hydroxy polydimethylsiloxane at 25 ℃ is 6-8: 2 to 4.
According to the application of the invention, various properties of the pouring sealant are effectively improved by reasonably preparing the polysiloxane and the silicone oil according to parts by weight and viscosity. The applicant speculates that: when the weight ratio of the polysiloxane to the silicone oil is not good, the hydroxyl reaction activity is not high, the deep curing effect is low, and if the content of the silicone oil is high, the number of crosslinking reaction nodes is reduced, and the bonding property is obviously reduced; and when the polydimethylsiloxane with different viscosities is mixed with the silicone oil, the overall system viscosity of the pouring sealant can be effectively adjusted, so that the pouring sealant has good flowing property and leveling property. The applicant finds that when the viscosity is 2000cps, the mass ratio of the hydroxyl polydimethylsiloxane at 25 ℃ to the hydroxyl polydimethylsiloxane at 20000cps to the hydroxyl polydimethylsiloxane at 25 ℃ is 6-8: and 2-4 hours, the flowing property and the leveling property of the pouring sealant system are optimal.
In some preferred embodiments, the hydrogen-containing silicone oil has a hydrogen content of 0.1 to 1 wt%.
In the application of the invention, the hydrogen content of the hydrogen-containing silicone oil is the hydrogen content in the silicone oil in unit mass, and the numerical value of the hydrogen content can be multiplied by 10, and the unit is mmol/g, namely the mole content of hydrogen in each gram of the hydrogen-containing silicone oil.
In some preferred embodiments, the hydrogen-containing silicone oil is a mixture of hydrogen-containing silicone oil with a hydrogen content of 0.18% and hydrogen-containing silicone oil with a hydrogen content of 0.36%; the mass ratio of the hydrogen-containing silicone oil with the hydrogen content of 0.18% to the hydrogen-containing silicone oil with the hydrogen content of 0.36% is (2-3): 1.
according to the application of the invention, the hydrogen-containing silicone oil with composite hydrogen content is used as the preparation raw material of the pouring sealant, so that the deep curing effect of the pouring sealant is effectively improved, and the optimal transparency of the pouring sealant is kept. The applicant speculates that: the hydrogen-containing silicone oil with specific hydrogen content can effectively generate a crosslinking dehydrogenation phenomenon under the action of organic tin, thereby improving the deep curing effect and reducing the requirement of a reaction system on trace moisture; the applicant finds that when the mass ratio of the hydrogen-containing silicone oil with the hydrogen content of 0.18% to the hydrogen-containing silicone oil with the hydrogen content of 0.36% is 2-3: 1, the best reaction effect can be achieved, when the overall hydrogen content of the hydrogen-containing silicone oil is high, the high hydrogen content can cause the dehydrogenation reaction to be too fast, and hydrogen cannot be technically discharged in a cross-linked structure to form bubbles; when the hydrogen content of the hydrogen-containing silicone oil as a whole is low, the reactivity of the hydrogen-containing silicone oil with the hydroxyl groups in the other components becomes weak, and the crosslinking curing nodes in the system are significantly reduced.
In some preferred embodiments, the silicate/methylsilane is at least one of methyl orthosilicate, ethyl orthosilicate, propyl orthosilicate, methyltrimethoxysilane, methyltriethoxysilane, vinyltrimethoxysilane, and ethyl polysilicate.
In some more preferred embodiments, the silicate/methylsilane is propyl orthosilicate.
In some preferred embodiments, the adjuvant is at least one of an amino coupling agent, an epoxy coupling agent, and an amino oligomer.
In some preferred embodiments, the mass ratio of the amino coupling agent, the epoxy coupling agent and the amino oligomer is (1-1.5): (0.1-1.5): (0.1 to 1.5).
In some preferred embodiments, the mass ratio of the amino coupling agent, the epoxy coupling agent and the amino oligomer is (1-1.5): (0.1-1.5): (0.1 to 1.5).
In some preferred embodiments, the mass ratio of the amino coupling agent, the epoxy coupling agent, and the amino oligomer is 1: (0.3-0.8): (0.3-0.8).
In some preferred embodiments, the mass ratio of the amino coupling agent, the epoxy coupling agent, and the amino oligomer is 1:0.5: 0.3.
in some preferred embodiments, the amino coupling agent is at least one of aminopropyltriethoxysilane, aminopropyltrimethoxysilane, gamma-aminoethylaminopropyltrimethoxysilane, gamma-aminoethylaminopropyltriethoxysilane, bis- [3- (triethoxysilyl) -propyl ] -amine, bis- [3- (trimethoxysilyl) -propyl ] -ethylenediamine, bis- [3- (triethoxysilyl) -propyl ] -ethylenediamine.
In some preferred embodiments, the epoxy-based coupling agent is at least one of gamma- (2.3-epoxypropoxy) propyltrimethoxysilane, 2- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane
In some preferred embodiments, the amino oligomer is at least one of a mono-amino oligomer and a di-amino oligomer.
In some preferred embodiments, the organotin salt is at least one of dibutyltin dilaurate, dibutyltin diacetylacetonate.
In some preferred embodiments, the mass ratio of the component A to the component B is (15-25): (1-10).
In some preferred embodiments, the mass ratio of component a to component B is 20: 1 to 5.
In some preferred embodiments, the mass ratio of component a to component B is 20: 2.
the second aspect of the invention provides a preparation method of the double-component condensed type transparent pouring sealant, which comprises the following steps: (1) mixing the raw materials of the component A, uniformly stirring for 5-15 minutes at a dispersion speed of 5-30 Hz to obtain a component A mixed solution; (2) mixing the raw materials of the component B, and uniformly stirring for 5-15 minutes to obtain a component B mixed solution; (3) mixing the component A mixed solution and the component B mixed solution in proportion, and pumping to vacuum to obtain the product.
Examples
The technical solution of the present invention is described in detail by the following examples, but the scope of the present invention is not limited to all of the examples. The starting materials of the present invention are all commercially available unless otherwise specified.
Example 1
Embodiment 1 provides a two-component condensed type transparent pouring sealant in a first aspect, which comprises a component A and a component B, wherein the component A comprises 70 parts by weight of hydroxyl polydimethylsiloxane with the viscosity of 2000cps and the temperature of 25 ℃, 30 parts by weight of hydroxyl polydimethylsiloxane with the viscosity of 20000cps and the temperature of 25 ℃, and 6 parts by weight of methyl silicone oil with the viscosity of 300 cps; the component B comprises 100 parts by weight of methyl silicone oil with the viscosity of 300cps and the temperature of 25 ℃, 60 parts by weight of propyl orthosilicate, 18 parts by weight of gamma-aminopropyl triethoxysilane and 8 parts by weight of dibutyl tin dilaurate.
In this example, the weight ratio of component a to component B was 10: 1.
in this example, the hydroxy polydimethylsiloxane is two products sold in Kay chemical industry of Shanghai with an average viscosity of 2000cps, 25 ℃ and 20000cps, and 25 ℃.
In this example, the methyl silicone oil is a product sold in Kjen chemical industry of Shanghai with an average viscosity of 300cps and a temperature of 25 ℃.
The second aspect of this embodiment provides a method for preparing a two-component condensed type transparent pouring sealant, which comprises the following steps: (1) mixing the raw materials of the component A, uniformly stirring for 10 minutes, and dispersing at a speed of 20 Hz to obtain a component A mixed solution; (2) mixing the raw materials of the component B, and uniformly stirring for 10 minutes to obtain a component B mixed solution; (3) mixing the component A mixed solution and the component B mixed solution in proportion, and pumping to vacuum to obtain the product.
Example 2
The embodiment of the present invention is different from embodiment 1 in that: 5 parts of ethyl polysilicate, 2 parts of ethanol and 10 parts of dibutyl tin dilaurate are also added into the component B.
Example 3
The embodiment of the present invention is different from embodiment 1 in that: 3 parts by weight of hydrogen-containing silicone oil with the hydrogen content of 0.36wt% is also added into the component A.
In this example, the hydrogen-containing silicone oil is a series of hydrogen-containing silicone oil products sold by chemical corporation of new four seas in Hubei with a hydrogen content of 0.36 wt%.
Example 4
The embodiment of the present invention is different from embodiment 1 in that: 3 parts by weight of hydrogen-containing silicone oil with the hydrogen content of 0.75wt% is also added into the component A.
In this example, the hydrogen-containing silicone oil is a hydrogen-containing silicone oil product sold by chemical corporation of new four seas in Hubei with a hydrogen content of 0.75 wt%.
Example 5
The embodiment of the present invention is different from embodiment 1 in that: 3 parts by weight of hydrogen-containing silicone oil is also added into the component A, and the hydrogen content of 0.18wt% and the hydrogen-containing silicone oil with the hydrogen content of 0.36wt% are mixed according to the proportion of 2: 1.
In this example, the hydrogen-containing silicone oil is a hydrogen-containing silicone oil product sold by chemical corporation of new four seas in Hubei with hydrogen contents of 0.18wt% and 0.36 wt%.
Example 6
The embodiment of the present invention is different from embodiment 1 in that: and 9 parts by weight of a mixture of bis- [3- (triethoxysilyl) -propyl ] -amine, gamma- (2, 3-glycidoxy) propyl trimethoxy silane and monoamino oligomer in a ratio of 1:0.5:0.3 is added into the component B.
In this example, the monoamino oligomer is a D400-terminated amino polyether sold by Vanxin Dow chemical Co., Ltd.
Example 7
The embodiment of the present invention is different from embodiment 1 in that: 3 parts by weight of hydrogen-containing silicone oil is also added into the component A, and the hydrogen content of 0.18 percent and the hydrogen-containing silicone oil with the hydrogen content of 0.36 percent are mixed according to the proportion of 2: 1.
And 9 parts by weight of a mixture of bis- [3- (triethoxysilyl) -propyl ] -amine, gamma- (2, 3-glycidoxy) propyl trimethoxy silane and monoamino oligomer in a ratio of 1:0.5:0.3 is added into the component B.
In this example, the hydrogen-containing silicone oil is a hydrogen-containing silicone oil product sold by chemical corporation of new four seas in Hubei with hydrogen contents of 0.18wt% and 0.36 wt%.
In this example, the monoamino oligomer is a D400-terminated amino polyether sold by Vanxin Dow chemical Co., Ltd.
Example 8
The embodiment of the present invention is the same as embodiment 7, except that: the hydrogen-containing silicone oil is the hydrogen-containing silicone oil with the total hydrogen content of 1 wt%.
In this example, the hydrogen-containing silicone oil is a hydrogen-containing silicone oil product with a hydrogen content of 1wt% sold by chemical corporation in new four seas, Hubei.
Example 9
The embodiment of the present invention is the same as embodiment 7, except that: the hydrogen-containing silicone oil is hydrogen-terminated hydrogen-containing silicone oil.
In this embodiment, the hydrogen-containing silicone oil is hydrogen-terminated hydrogen-containing silicone oil sold by chemical corporation in new four seas in Hubei province.
Evaluation of Performance
The two-component condensed type transparent pouring sealant prepared in all the examples is subjected to deep curing, adhesion and water ultraviolet tests, and the method comprises the following steps:
the viscosity is measured at 25 ℃ and the tack-free time is measured according to GB/T13477.5; placing the cured rubber sample into a water-ultraviolet irradiation test box to observe for more than 15 days at intervals of two days, checking whether the surface of the rubber sample has yellowing, cracking phenomena and the like, wherein the test result is represented by the following symbols:
v: indicating no yellowing or cracking;
x: indicating the occurrence of yellowing or cracking;
the adhesive materials PA66, PPS and PC were dipped in the glue samples of examples 1 to 7, respectively, and after curing, the glue samples were peeled off by hand from the cured ends to test the adhesiveness, and the test results were expressed by the following symbols:
●: indicating that the adhesive is well adhered to the board surface;
o: indicating that the colloid falls off or is not adhered to the board surface;
for each test of all examples, 5 specimens were tested and the average was taken and reported in table 1.
TABLE 1
Through the embodiments 1-9 and the table 1, the two-component condensed type transparent pouring sealant and the preparation method thereof provided by the invention have the advantages that the prepared pouring sealant has good deep curing effect, cohesiveness, ultraviolet resistance and cracking resistance, curing is performed from inside to outside, the curing effect is better, the pouring sealant is suitable for popularization in the field of pouring sealants, and the development prospect is wide. Wherein, the example 7 obtains the best performance index under the factors of the best raw material proportion, the best preparation process and the like.
Finally, it should be understood that the above-described embodiments are merely preferred embodiments of the present invention, and not intended to limit the present invention, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. The double-component condensed type transparent pouring sealant is characterized in that: comprises a component A and a component B; the component A at least comprises: polysiloxanes, silicone oils; the component B at least comprises: silicone oil, silicate ester/methylsilane, auxiliaries, organotin salts;
the component A at least comprises the following components in parts by weight: 80-120 parts of polysiloxane and 3-35 parts of silicone oil; the component B at least comprises the following components in parts by weight: 80-120 parts of silicone oil, 10-80 parts of silicate/methyl silane, 1-30 parts of an auxiliary agent and 0.5-10 parts of an organic tin salt;
the polysiloxane is a mixture of hydroxy polydimethylsiloxane with the viscosity of 2000cps and the temperature of 25 ℃ and hydroxy polydimethylsiloxane with the viscosity of 20000cps and the temperature of 25 ℃; the viscosity is 2000cps, the viscosity of the hydroxy polydimethylsiloxane at 25 ℃ is 20000cps, the mass ratio of the hydroxy polydimethylsiloxane at 25 ℃ is 6-8: 2-4;
the silicone oil is methyl silicone oil and hydrogen-containing silicone oil;
the hydrogen-containing silicone oil is a mixture of hydrogen-containing silicone oil with the hydrogen content of 0.18 percent and hydrogen-containing silicone oil with the hydrogen content of 0.36 percent; the mass ratio of the hydrogen-containing silicone oil with the hydrogen content of 0.18% to the hydrogen-containing silicone oil with the hydrogen content of 0.36% is (2-3): 1;
the auxiliary agent is an amino coupling agent, an epoxy coupling agent and an amino oligomer; the mass ratio of the amino coupling agent to the epoxy coupling agent to the amino oligomer is (1-1.5): (0.1-1.5): (0.1 to 1.5);
the mass ratio of the component A to the component B is (15-25): (1-10).
2. The preparation method of the two-component condensed type transparent pouring sealant according to claim 1, characterized in that: the method comprises the following steps: (1) mixing the raw materials of the component A, uniformly stirring for 5-15 minutes at a dispersion speed of 5-30 Hz to obtain a component A mixed solution; (2) mixing the raw materials of the component B, and uniformly stirring for 5-15 minutes to obtain a component B mixed solution; (3) mixing the component A mixed solution and the component B mixed solution in proportion, and pumping to vacuum to obtain the product.
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