CN110591635A - Sealant and preparation method thereof - Google Patents
Sealant and preparation method thereof Download PDFInfo
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- CN110591635A CN110591635A CN201910603507.9A CN201910603507A CN110591635A CN 110591635 A CN110591635 A CN 110591635A CN 201910603507 A CN201910603507 A CN 201910603507A CN 110591635 A CN110591635 A CN 110591635A
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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
- C09J11/04—Non-macromolecular additives inorganic
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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
- 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
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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Abstract
The invention discloses a sealant and a preparation method thereof, wherein the sealant has low volatility, the volatility is 0.01-0.025%, oil stains or fog cannot be left in electronic products, and the sealant is safe and environment-friendly and meets the RoHS standard of European Union; the sealant has excellent bonding strength and physical and mechanical properties, the tensile strength can reach 181.2kg/cm 2-187.1 kg/c square meter, and the bending strength can reach 420-430 kg/c square meter; the sealant has the characteristic of quick surface drying, and the surface drying and deep curing time can be adjusted, and the surface drying time can reach 1-20 min (the temperature is 20-25 ℃, and the relative humidity is 60%); the sealant has the characteristics of wide applicability, no corrosion to base materials, and excellent physical properties to various plastics such as ABS, PVC, HDPE, PC and the like and coated metals. The sealant has low production requirement and is suitable for mass production and popularization.
Description
Technical Field
The invention belongs to the field of sealing materials, and particularly relates to a sealant and a preparation method thereof.
Background
The sealing glue plays a main role in sealing and protecting the precise electronic element, the sealing effect of the sealing glue on the precise electronic element is poor, the electronic element in the precise electronic product can be caused or the waterproof effect of the precise electronic product can be reduced, the electronic element in the electronic product can further absorb moisture in the air, and the short circuit or the reaction of the electronic element is not flexible, so the precise electronic product needs to be sealed and protected to improve the waterproof grade of the precise electronic product.
Most of RTV sealant used in electronic industry in the current market is dealcoholized. The dealcoholized sealing glue has more low molecules and higher volatility in the curing process and is easy to generate circuit contact faults. Most of catalysts used by dealcoholization type sealant are toxic organic tin catalysts prohibited by European Union REACH regulation cleartext.
The sealant using titanate as a catalyst has no corrosion to a base material and excellent adhesion, but the sealant using titanate as a catalyst has too slow surface drying time and longer deep curing time, and seriously influences the production process of precise electronic products.
Disclosure of Invention
The invention aims to provide a sealant and a preparation method thereof, and overcomes the defects of an RTV sealant in the electronic industry in the using process.
In order to solve the technical problems, the technical scheme of the invention is as follows: the sealant material comprises alpha, omega dihydroxy polydimethylsiloxane, functional filler, coupling agent, crosslinking agent, tackifying resin, hydroxyl scavenging agent and catalyst, wherein the catalyst has the following structure:
，
in the catalyst structure, n is an integer of 0-5, and R1, R2 and R3 are any one of methoxy, ethoxy or propoxy at the same time.
Preferably, the viscosity of the alpha, omega dihydroxy polydimethylsiloxane is from 500cps to 12000 cps.
Preferably, the functional filler comprises gas phase SiO2Nano CaCO, nano-grade CaCO3One or the combination of two of titanium dioxide, kaolin, quartz powder or diatomite.
Preferably, the coupling agent comprises any one or the combination of two of gamma-aminopropyltriethoxysilane, gamma- (2, 3-glycidoxy) propyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, gamma-aminopropyltrimethoxysilane, aniline methyl triethoxysilane or phenyl trimethoxysilane.
Preferably, the crosslinking agent comprises any one of vinyl triisopropenoxysilane, phenyl triisopropenoxysilane, trimethyl isopropenyloxysilane or acryloxy triisopropylsilane, or a combination of at least two thereof.
Preferably, the hydroxyl scavenger comprises lactone and CaCl2Tris (6-isocyanatohexyl) isocyanate, MgCl2And hexamethyldisilazane.
Preferably, the structural formula of the tackifying resin is shown as follows:
，
r in the structural formula of the tackifying resin1Is any one of vinyl, n-propyl alkene or n-butyl alkene, R2Any one of methoxyl, ethoxyl or hydroxyl, and n is an integer of 3-5.
Preferably, the composition of the sealing material comprises the following components in parts by mass: 60-100 parts of alpha, omega dihydroxy polydimethylsiloxane; 60-100 parts of functional filler; 0.1-3 parts of a hydroxyl scavenging agent; 6-18 parts of a crosslinking agent; 0.1-10 parts of a coupling agent; 0.1-5 parts of tackifying resin; 0.1-5 parts of the catalyst.
The invention also provides a preparation method of the sealant, which comprises the following steps:
step (1): adding the functional filler, the hydroxyl scavenging agent and the alpha, omega dihydroxy polydimethylsiloxane into a kneading machine for mixing, uniformly kneading, heating, vacuumizing and defoaming to obtain a sealing material base material 1;
step (2): putting the base material 1 obtained in the step (1) into a power mixer, mixing a cross-linking agent with the base material, and uniformly stirring at room temperature to obtain a sealing material base material 2;
and (3): adding the coupling agent into the obtained base material 2 of the sealing material, and uniformly stirring at room temperature to obtain a base material 3 of the sealing material;
and (4): mixing the base material 3 of the sealing material obtained in the step (3) with tackifying resin, and uniformly stirring at room temperature to obtain a base material 4 of the sealing material;
and (5): and (4) mixing the base material 4 of the sealing material obtained in the step (4) with a catalyst, uniformly stirring at room temperature, and vacuumizing and defoaming to obtain the sealant.
Preferably, the temperature of the kneaded material in the step (1) is 85-150 ℃, the vacuum degree of the vacuum degassing is-0.06 MPa-0.085 MPa, and the vacuum degassing time is 60-120 min; the stirring time in the step (2), the step (3) and the step (4) is 10-60 min; and (3) after uniformly stirring in the step (5), vacuumizing and defoaming to a vacuum degree of-0.06 MPa to-0.085 MPa for 60-120 min.
The invention has the following beneficial effects: (1) the invention provides a sealant which has low volatility, the volatility is 0.01-0.025%, oil stains or fog cannot be left in electronic products, and the sealant is safe and environment-friendly and meets the European Union RoHS standard; (2) the sealant provided by the invention has excellent bonding strength and physical and mechanical properties, the tensile strength can reach 181.2kg/cm 2-187.1 kg/cm2, and the bending strength can reach 420-430 kg/cm 2; (3) the invention provides a sealant which has the characteristic of quick surface drying, and the surface drying and deep curing time can be adjusted, and the surface drying time can reach 1-20 min (the temperature is 20-25 ℃, and the relative humidity is 60%); (4) the invention provides a sealant which has the characteristics of wide applicability, no corrosion to a base material and excellent physical properties to various plastics such as ABS, PVC, HDPE, PC and the like and coated metals. (5) The sealant provided by the invention has low production requirement and is suitable for mass production and popularization.
Drawings
FIGS. 1 and 2 are graphs of the results of tests conducted on tensile and flexural strength of sealants provided by examples 1-5 and comparative examples 1-3 and commercially available dealcoholized sealants.
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted; the same or similar reference numerals correspond to the same or similar parts; the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be described in further detail with reference to examples. The method comprises the following specific steps:
example 1
The preparation method of the sealant specifically comprises the following steps:
step (1): 60g of nano CaCO3, 1g of hexamethylsilazane and 100g of alpha, omega-dihydroxy polydimethylsiloxane are put into a kneader to be mixed, after uniform kneading, the temperature is raised to 100 ℃, and the mixture is vacuumized to-0.08 MPa to be defoamed for 90min to obtain a base material 1 of the sealing material;
step (2): putting the base material 1 obtained in the step (1) into a power mixer, mixing 10g of trimethyl isopropenyl oxysilane with the base material, and uniformly stirring at room temperature for 20min to obtain a sealing material base material 2;
and (3): 3g N- (2-aminoethyl) -3-aminopropyltrimethoxysilane is added into the obtained sealing material base material 2, and the mixture is uniformly stirred for 20min at room temperature to obtain a sealing material base material 3;
and (4): adding 3g of tackifying resin into the sealing material base material 3 obtained in the step (3), and uniformly stirring at room temperature for 20min to obtain a sealing material base material 4;
and (5): 2g of catalyst is put into the base material 4 of the sealing material obtained in the step (4) to be mixed with the base material, the mixture is uniformly stirred at room temperature, and the mixture is vacuumized to-0.08 MPa and defoamed for 90min to obtain the sealant; wherein the structural formula of the tackifying resin is CH2CH[OSi(CH3)2]10OSi(OCH2CH3)3The structural formula of the catalyst is (CH)2CH2N)2CN(CH2)3Si(OCH3)3。
Example 2
The preparation method of the sealant specifically comprises the following steps:
step (1): putting 60g of SiO2, 2g of lactone and 100g of alpha, omega dihydroxy polydimethylsiloxane into a kneader for mixing, uniformly kneading, heating to 120 ℃, vacuumizing to-0.06 MPa, and defoaming for 120min to obtain a sealing material base material 1;
step (2): putting the base material 1 obtained in the step (1) into a power mixer, mixing 12g of phenyltriisopropenoxysilane with the base material, and uniformly stirring at room temperature for 30min to obtain a sealing material base material 2;
and (3): 3g of gamma-aminopropyltrimethoxysilane is added into the obtained sealing material base material 2, and the mixture is uniformly stirred for 30min at room temperature to obtain a sealing material base material 3;
and (4): mixing the sealing material base material 3 obtained in the step (3) with 5g of tackifying resin, and uniformly stirring at room temperature for 30min to obtain a sealing material base material 4;
and (5): mixing the base material 4 of the sealing material obtained in the step (4) with 2g of catalyst, uniformly stirring at room temperature, vacuumizing to-0.06 MPa, and defoaming for 120min to obtain the sealant; wherein the structural formula of the tackifying resin is CH3CH2CH[OSi(CH3)2]20OSi(OCH3)3The structural formula of the catalyst is (CH)2CH2N)2CN(CH2)3Si(OCH2CH3)3。
Example 3
The preparation method of the sealant specifically comprises the following steps:
step (1): putting 70g of kaolin, 2g of tri (6-hexyl isocyanate) isocyanate and 90g of alpha, omega dihydroxy polydimethylsiloxane into a kneader, mixing uniformly, heating to 110 ℃, vacuumizing to-0.085 MPa, and defoaming for 120min to obtain a sealing material base material 1;
step (2): putting the base material 1 obtained in the step (1) into a power mixer, mixing 12g of vinyl triisopropenoxysilane with the base material, and uniformly stirring at room temperature for 30min to obtain a sealing material base material 2;
and (3): 3g of gamma-aminopropyltriethoxysilane is added into the obtained sealing material base material 2, and the mixture is stirred uniformly for 30min at room temperature to obtain a sealing material base material 3;
and (4): mixing the sealing material base material 3 obtained in the step (3) with 3g of tackifying resin, and uniformly stirring at room temperature for 30min to obtain a sealing material base material 4;
and (5): mixing the base material 4 of the sealing material obtained in the step (4) with 4g of catalyst, uniformly stirring at room temperature, vacuumizing to-0.06 MPa, and defoaming for 60min to obtain the sealant; wherein, CH2CHCH2CH2[OSi(CH3)2]30OSi(OCH2CH3)3The structural formula of the catalyst is (CH)2CH2N)2CN(CH2)5Si(OCH3)3。
Example 4
The preparation method of the sealant specifically comprises the following steps:
step (1): putting 80g of quartz powder, 3g of MgCl2 and 80g of alpha, omega dihydroxy polydimethylsiloxane into a kneader for mixing, uniformly kneading, heating to 130 ℃, vacuumizing to-0.06 MPa, and defoaming for 50min to obtain a sealing material base material 1;
step (2): putting the base material 1 obtained in the step (1) into a power mixer, mixing 16g of acryloyloxy triisopropyl silane with the base material, and uniformly stirring at room temperature for 40min to obtain a sealing material base material 2;
and (3): 3g of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane is put into the obtained sealing material base material 2 and is uniformly stirred for 40min at room temperature to obtain a sealing material base material 3;
and (4): mixing the sealing material base material 3 obtained in the step (3) with 3g of tackifying resin, and uniformly stirring at room temperature for 30min to obtain a sealing material base material 4;
and (5): mixing the base material 4 of the sealing material obtained in the step (4) with 3g of catalyst, uniformly stirring at room temperature, vacuumizing to-0.06 MPa, and defoaming for 60min to obtain the sealant; wherein the structural formula of the tackifying resin is CH2CH[OSi(CH3)2]40OSi(OCH2CH3)3The structural formula of the catalyst is (CH)2CH2N)2CN(CH2)4Si(OCH3)3。
Example 5
The preparation method of the sealant specifically comprises the following steps:
step (1): adding 60g of diatomite, 3g of CaCl2 and 100g of alpha, omega dihydroxy polydimethylsiloxane into a kneader for mixing, uniformly kneading, heating to 130 ℃, vacuumizing to-0.07 MPa, and defoaming for 80min to obtain a sealing material base material 1;
step (2): putting the base material 1 obtained in the step (1) into a power mixer, mixing a mixture of 8g of vinyl triisopropenoxysilane and 6g of trimethyl isopropenyl oxysilane, and stirring uniformly at room temperature for 20min to obtain a sealing material base material 2;
and (3): 1g of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane and 1g of gamma-aminopropyl trimethoxy silane are put into the obtained sealing material base material 2 and are stirred uniformly for 20min at room temperature to obtain a sealing material base material 3;
and (4): mixing the sealing material base material 3 obtained in the step (3) with 3g of tackifying resin, and uniformly stirring at room temperature for 30min to obtain a sealing material base material 4;
and (5): mixing the base material 4 of the sealing material obtained in the step (4) with 3g of catalyst, uniformly stirring at room temperature, vacuumizing to-0.06 MPa, and defoaming for 80min to obtain the sealant; wherein the structural formula of the tackifying resin is CH2CH[OSi(CH3)2]50OSi(OCH3)3The structural formula of the catalyst is (CH)2CH2N)2CN(CH2)4Si(OCH2CH3)3。
Comparative example 1
The preparation method of the sealant specifically comprises the following steps:
step (1): 60g of nano CaCO3, 1g of hexamethylsilazane and 100g of alpha, omega-dihydroxy polydimethylsiloxane are put into a kneader to be mixed, the mixture is uniformly kneaded, the temperature is raised to 100 ℃, the mixture is vacuumized to-0.08 MPa, and the mixture is defoamed for 90min to obtain the base material 1 of the sealing material.
Step (2): and (2) putting the base material 1 obtained in the step (1) into a power mixer, mixing 10g of trimethyl isopropenyl oxysilane with the base material, and uniformly stirring at room temperature for 20min to obtain the base material 2 of the sealing material.
And (3): 3g N- (2-aminoethyl) -3-aminopropyltrimethoxysilane is added into the obtained sealing material base material 2, and the mixture is uniformly stirred for 20min at room temperature to obtain a sealing material base material 3.
And (4): and (3) adding 2g of catalyst into the base material 3 of the sealing material obtained in the step (3) to mix with the base material, uniformly stirring at room temperature, vacuumizing to-0.08 MPa, and defoaming for 90min to obtain the sealant.
Comparative example 2
The preparation method of the sealant comprises the following steps: in this comparative example, the conditions were the same as in example 1 except that the tackifier resin in step (4) was replaced with an epoxyphenyl silicone resin.
Comparative example 3
The preparation method of the sealant comprises the following steps: in this comparative example, the catalyst of step (5) was replaced with diisopropyl bis (ethylacetoacetate) titanate under the same conditions as in example 1.
The tensile and flexural strengths of the sealants provided by examples 1-5 and comparative examples 1-3 and commercially available dealcoholized sealants were tested. Testing the surface drying time according to GB/T13477.5-2002; testing the curing conditions of 2h, 6h, 12h and 24h under the conditions of room temperature and relative humidity of 60%; after curing for 7 days, the volatility of the product after drying for 3 hours at 150 ℃ is tested; test at 85 ℃ and 85% humidity addition for 7 days before and after sealing; the dielectric strength was tested according to GB/T1408.1-1999. The test results are shown in fig. 1 and 2.
According to the test results shown in fig. 1 and fig. 2, the shear strength of the sealant provided in examples 1 to 5 can reach 2.5 to 2.8MPa, the tensile strength can reach 182.5 to 187.2kg/cm3, the bending strength can reach 420 to 431kg/cm3, and the sealant has excellent physical properties. The dielectric constant change rate after sealing and after sealing by 'double 85' is less than 1%, and the deep curing and surface drying time is relatively quick, so that the sealant provided by the embodiments 1-5 has excellent sealing performance on precise electronic products.
In comparative example 1, no tackifying resin was used, and it can be seen from the test results that the physical properties of the sealant were significantly reduced. In the comparative example 2, epoxy phenyl silicone resin is used to replace the original tackifying resin, in the comparative example 3, diisopropyl bis (ethyl acetoacetate) titanate is used to replace the original catalyst, and the performances of the sealants prepared in the comparative examples 2 and 3 can not reach the indexes of the sealant prepared in the example 1.
The performances of the dealcoholized sealant sold in the comparative example are not superior to those of the sealant disclosed by the invention.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A sealant is characterized in that: the sealant material comprises alpha, omega dihydroxy polydimethylsiloxane, functional filler, coupling agent, crosslinking agent, tackifying resin, hydroxyl scavenging agent and catalyst, wherein the structure of the catalyst is as follows:
，
in the catalyst structure, n is an integer of 0-5, and R1, R2 and R3 are any one of methoxy, ethoxy or propoxy at the same time.
2. The sealant according to claim 1, wherein: the viscosity of the alpha, omega dihydroxy polydimethylsiloxane is 500cps to 12000 cps.
3. The sealant according to claim 1, wherein: the functional filler comprises gas-phase SiO2Nano CaCO, nano-grade CaCO3One or the combination of two of titanium dioxide, kaolin, quartz powder or diatomite.
4. The sealant according to any one of claims 1 to 3, characterized in that: the coupling agent comprises one or the combination of two of gamma-aminopropyltriethoxysilane, gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, gamma-aminopropyltrimethoxysilane, aniline methyl triethoxysilane or phenyl trimethoxysilane.
5. The sealant according to claim 1, wherein: the cross-linking agent comprises any one or the combination of at least two of vinyl triisopropenoxysilane, phenyl triisopropenoxysilane, trimethyl isopropenyloxysilane or acryloxy triisopropylsilane.
6. Root of herbaceous plantThe sealant according to claim 1, wherein: the hydroxyl scavenger comprises lactone and CaCl2Tris (6-isocyanatohexyl) isocyanate, MgCl2And hexamethyldisilazane.
7. The sealant according to claim 1, wherein: the structural formula of the tackifying resin is shown as follows:
，
r in the structural formula of the tackifying resin1Is any one of vinyl, n-propyl alkene or n-butyl alkene, R2Any one of methoxyl, ethoxyl or hydroxyl, and n is an integer of 3-5.
8. The sealant according to claim 1, wherein: the composition of the sealing material comprises the following components in parts by mass: 60-100 parts of alpha, omega dihydroxy polydimethylsiloxane; 60-100 parts of functional filler; 0.1-3 parts of a hydroxyl scavenging agent; 6-18 parts of a crosslinking agent; 0.1-10 parts of a coupling agent; 0.1-5 parts of tackifying resin; 0.1-5 parts of the catalyst.
9. The preparation method of the sealant is characterized by comprising the following steps: the preparation method of the sealant comprises the following steps:
step (1): adding the functional filler, the hydroxyl scavenging agent and the alpha, omega dihydroxy polydimethylsiloxane into a kneading machine for mixing, uniformly kneading, heating, vacuumizing and defoaming to obtain a sealing material base material 1;
step (2): putting the base material 1 obtained in the step (1) into a power mixer, mixing a cross-linking agent with the base material, and uniformly stirring at room temperature to obtain a sealing material base material 2;
and (3): adding the coupling agent into the obtained base material 2 of the sealing material, and uniformly stirring at room temperature to obtain a base material 3 of the sealing material;
and (4): mixing the base material 3 of the sealing material obtained in the step (3) with tackifying resin, and uniformly stirring at room temperature to obtain a base material 4 of the sealing material;
and (5): and (4) mixing the base material 4 of the sealing material obtained in the step (4) with a catalyst, uniformly stirring at room temperature, and vacuumizing and defoaming to obtain the sealant.
10. The method for preparing the sealant according to claim 9, wherein: the temperature of the kneaded material in the step (1) is 85-150 ℃, the vacuum degree of the vacuum degassing is-0.06 MPa-0.085 MPa, and the time of the vacuum degassing is 60-120 min; the stirring time in the step (2), the step (3) and the step (4) is 10-60 min; and (3) after uniformly stirring in the step (5), vacuumizing and defoaming to a vacuum degree of-0.06 MPa to-0.085 MPa for 60-120 min.
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