CN111334246A - Single-component room temperature vulcanized silicone structural adhesive and preparation method thereof - Google Patents
Single-component room temperature vulcanized silicone structural adhesive and preparation method thereof Download PDFInfo
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- CN111334246A CN111334246A CN202010139187.9A CN202010139187A CN111334246A CN 111334246 A CN111334246 A CN 111334246A CN 202010139187 A CN202010139187 A CN 202010139187A CN 111334246 A CN111334246 A CN 111334246A
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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
- C09J183/06—Polysiloxanes containing silicon bound to oxygen-containing groups
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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
- 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
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2206—Oxides; Hydroxides of metals of calcium, strontium or barium
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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
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/222—Magnesia, i.e. magnesium oxide
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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
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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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
- 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
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Abstract
The invention discloses a single-component room temperature vulcanized silicone structural adhesive and a preparation method thereof. The single-component room temperature vulcanized silicone structural adhesive comprises the following components in parts by mass: 400-700 parts of a base polymer; 0-150 parts of a plasticizer; 100-500 parts of reinforcing filler; 20-40 parts of a crosslinking agent; 10-20 parts of a tackifier; 1-3 parts of a catalyst; 6-16 parts of a curing accelerator A; 20-50 parts of a curing accelerator B; the curing accelerator A and the curing accelerator B can perform acid-base neutralization reaction at 60-80 ℃ to generate water. The single-component room temperature vulcanized silicone structural adhesive has the advantages of simple preparation process and low storage requirement, obviously improves the curing speed and depth, has the curing depth of more than 10mm in 24 hours, and can be cured at room temperature by heating the sealing adhesive before use to initiate reaction.
Description
Technical Field
The invention belongs to the technical field of silicone structural adhesives, and particularly relates to a single-component room-temperature vulcanized silicone structural adhesive and a preparation method thereof.
Background
The room temperature vulcanized silicone adhesive can be used as an adhesive, a sealant and a potting agent, and has wide application in the fields of buildings, electronics, machinery and the like. The silicone structural adhesive is an adhesive capable of achieving structural bonding, can bear large load, is aging-resistant, fatigue-resistant and corrosion-resistant, is stable in performance in the expected life, is suitable for bonding strong structural members, and is typically applied to installation and fixation of glass curtain walls and photovoltaic modules.
The room temperature vulcanizing silicone adhesive can be classified into a one-component (RTV-1) and a two-component (RTV-2) according to the type of packaging. Wherein RTV-1 can be used by directly extruding from the package without special equipment, which is more convenient. However, RTV-1 is cured by means of external water vapor, so that the surface curing is fast, the inner layer curing is slow, the curing depth is 2-3mm in 24 hours generally, and the curing is difficult after a certain depth is exceeded, so that the RTV-1 is generally used in the places with the depth less than 6 mm. RTV-2 is divided into AB two components, and when in use, the two components need to be mixed according to a certain proportion and then applied with glue, and the glue is cured without depending on external water vapor, and can be completely cured within a few hours at room temperature no matter how deep. However, the AB component is inconvenient to use, generally used after being mixed by large-scale equipment in a workshop, and if the AB component is used outdoors or in small-batch construction, the AB component is mixed by a manual mixing device or a double-component packaging matching mixer, but the AB component has the defects of uneven mixing, high packaging cost and the like.
Patent CN103725009A discloses a method for preparing a fast curing alcohol type transparent room temperature vulcanized silicone adhesive, which comprises adding ketone or lipid substances with strong volatility into the silicone adhesive, and utilizing the volatilization of the ketone or lipid substances to form capillary apertures in the silicone adhesive to promote the entry of water vapor. In addition, hydrophilic polymer is added to enhance the absorption of water vapor by the colloid. Tests show that the curing depth can reach 3.3mm in 24 hours, and the curing depth is improved by more than 50% compared with the glue without the accelerator.
Patent CN107142074A discloses a deoximation type single-component room temperature sealant. The porous structure filler and hygroscopic polymer are added to the silicone adhesive system for the purpose of increasing the curing speed and depth. The curing depth can reach 1.9mm in 4 hours.
Patent CN108546543A discloses an organosilicon sealant and a preparation method and application thereof. The main characteristic is that modified polyether polyol is added as a curing agent, so that the curing speed and depth are improved. The 24 hour cure depth increased from 3.5mm to 6 mm.
Although the scheme in the above patent improves the curing speed and the depth of glue to a certain extent, the curing depth can reach 6mm in 24 hours, but for some deeper parts, the glued part needs to be kept shaped for a long time after gluing to wait for curing, and the construction efficiency is influenced.
Patent CN103951980B discloses a moisture-heat dual-curing silicone composition, which has the property of thermally accelerating curing by adding an inorganic salt containing crystal water, wherein the crystal water is converted into free water when heated, so that the curing of silicone adhesive can be promoted, and the curing depth can reach about 8mm in 24 hours under the environment of 80 ℃. However, many of the inorganic salts of water of crystallization used in this patent begin to dehydrate gradually at around 30 ℃ and cause the silica gel to solidify, which places high demands on the production and storage of the silicone gel. And part of the crystal water inorganic salt is decomposed by heating to generate ammonia gas and carbon dioxide, so that pores are formed in the colloid possibly, and the colloid strength is reduced. In addition, the initial free water content of the crystal water inorganic salt is not easy to control, and the cross-linking in the silicone adhesive package or the shelf life is easily shortened. After the glue is applied, the construction part needs to be heated to achieve the purpose of rapid curing.
Disclosure of Invention
The invention aims to make up the defects of the prior art and provides a single-component room temperature vulcanized silicone structural adhesive and a preparation method thereof, the single-component room temperature vulcanized silicone structural adhesive has a simple preparation process and low storage requirement, the curing speed and depth are obviously improved, the curing depth is more than 10mm in 24 hours, and the curing can be completed at room temperature by heating a sealing colloid before use to initiate reaction.
In order to achieve the purpose, the invention adopts the following technical scheme:
a single-component room temperature vulcanized silicone structural adhesive comprises the following components in parts by mass:
400-700 parts of a base polymer;
0-150 parts of a plasticizer;
100-500 parts of reinforcing filler;
20-40 parts of a crosslinking agent;
10-20 parts of a tackifier;
1-3 parts of a catalyst;
6-16 parts of a curing accelerator A;
20-50 parts of a curing accelerator B;
the curing accelerator A and the curing accelerator B can perform acid-base neutralization reaction at 60-80 ℃ to generate water.
The curing accelerator A and the curing accelerator B are added into the single-component room-temperature vulcanized silicone structural adhesive, and the single-component room-temperature vulcanized silicone structural adhesive and the curing accelerator B can generate acid-base neutralization reaction at 60-80 ℃ to generate water, so that the curing of the silicone structural adhesive is promoted. The reaction temperature of the silicone structural adhesive is not too low, the stability of the silicone structural adhesive is poor due to too low temperature, the silicone structural adhesive is not easy to store, the reaction temperature of the silicone structural adhesive is not too high, the subsequent initiation condition is not easy to control due to too high temperature, and the energy consumption is high.
Further, the curing accelerator a is one of zinc oxide, calcium oxide, magnesium oxide, aluminum hydroxide, zinc hydroxide, calcium hydroxide, and magnesium hydroxide.
Further, the curing accelerator B is one or more of caproic acid, caprylic acid, capric acid, lauric acid, palmitic acid and stearic acid.
The curing accelerator A is common oxide or hydroxide which is easy to obtain, and is mixed in the structural adhesive for stable storage; curing accelerator B is preferably an acid having an acid and a moderate melting point, and can react with curing accelerator A at a suitable temperature.
Further, the base polymer is alkoxy-terminated polydimethylsiloxane or dihydroxy polydimethylsiloxane with the viscosity of 20000-80000 cs.
Further, the plasticizer is dimethyl polydimethylsiloxane with the viscosity of 100-1000 cs.
Further, the reinforcing filler is one or more of fumed silica, precipitated silica and active nano calcium carbonate.
Further, the cross-linking agent is one or a mixture of more of methyltrimethoxysilane, methyltriethoxysilane, methyl orthosilicate, ethyl orthosilicate and ethyl orthosilicate oligomer.
Further, the tackifier is one or a mixture of several of KH540, KH550, KH560, A187 and KH 792.
Further, the catalyst is one or more of dibutyltin dilaurate, dibutyltin diacetate, stannous octoate, titanate chelate and organic tin chelate.
The invention also provides a preparation method of the single-component room temperature vulcanized silicone structural adhesive, which comprises the following steps:
(1) uniformly mixing a basic polymer, a plasticizer, a reinforcing filler and a curing accelerator A, heating to 130-150 ℃, dehydrating for 3-5 hours under the vacuum degree of-0.090-0.098 MPa, and cooling to room temperature to obtain a base material;
(2) and (3) adding a cross-linking agent, a tackifier, a catalyst and a curing accelerator B into the base material in sequence, controlling the temperature of the material to be lower than 40 ℃ by using cooling water in the period, uniformly stirring, discharging and packaging.
The invention also provides a use method of the single-component room temperature vulcanized silicone structural adhesive, which comprises the following steps: the construction is carried out by using the gluing device with the heating function at the glue nozzle part, the sealant is heated at the glue nozzle part when gluing, the heating temperature is set to be 60-80 ℃, the time of the sealant passing through the heating part is controlled, the whole section of the sealant is ensured to be heated to the set temperature, and the sealant is directly coated on the construction part after coming out of the glue nozzle.
The invention has the following technical characteristics:
1) according to the invention, the curing accelerator A and the curing accelerator B can generate acid-base neutralization reaction during heating, so that water is generated, and the curing speed and the curing depth of the silicone structural adhesive can be promoted.
2) The vulcanized silicone structural adhesive does not release water to initiate curing in the storage process, so that the vulcanized silicone structural adhesive has low storage requirement and is convenient to transport.
3) The vulcanized silicone structural adhesive is initiated by heating when in use, the whole adhesive part does not need to be heated, the subsequent curing can be finished at room temperature, and the preparation process and the use process can be well controlled.
4) The curing depth of the vulcanized silicone structural adhesive in 24 hours is more than 10mm, and the vulcanized silicone structural adhesive has higher strength, can bear larger load and meets the requirement of structural bonding.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
Example 1
400 parts of base polymer, 100 parts of plasticizer, 500 parts of reinforcing filler and 16 parts of curing accelerator are uniformly mixed in a planetary machine, the temperature is raised to 130 ℃, the mixture is dehydrated for 5 hours under the vacuum degree of-0.090 to-0.098 MPa, and the mixture is cooled to room temperature to obtain the base material. And (3) sequentially adding 20 parts of cross-linking agent, 10 parts of tackifier, 2 parts of catalyst and 50 parts of curing accelerator B into the base material, controlling the material temperature to be lower than 40 ℃ by using cooling water during the process, uniformly stirring, discharging and packaging.
Wherein, the base polymer is 20000cs alkoxy-terminated polydimethylsiloxane, the plasticizer is 1000cs dimethyl polydimethylsiloxane, the reinforcing filler is nano calcium, the cross-linking agent is methyl trimethoxy silane, the tackifier is KH550, the catalyst is dibutyltin dilaurate, the curing accelerator A is zinc oxide, and the curing accelerator B is stearic acid.
When gluing, the temperature is set to 80 ℃.
Example 2
400 parts of base polymer, 150 parts of plasticizer, 450 parts of reinforcing filler and 10 parts of curing accelerator are uniformly mixed in a planetary machine, the temperature is raised to 150 ℃, the mixture is dehydrated for 3 hours under the vacuum degree of-0.090 to-0.098 MPa, and the mixture is cooled to room temperature to obtain the base material. Adding 25 parts of cross-linking agent, 15 parts of tackifier, 3 parts of catalyst and 50 parts of curing accelerator B into the base material in sequence, controlling the material temperature to be lower than 40 ℃ by using cooling water in the period, uniformly stirring, discharging and packaging.
Wherein, the base polymer is 80000cs alkoxy-terminated polydimethylsiloxane, the plasticizer is 100cs dimethyl polydimethylsiloxane, the reinforcing filler is nano calcium, the crosslinking agent is tetraethoxysilane, the tackifier is KH792, the catalyst is titanate chelate, the curing accelerator A is calcium oxide, and the curing accelerator B is palmitic acid.
When gluing, the temperature is set to 70 ℃.
Example 3
Uniformly mixing 850 parts of basic polymer, 50 parts of plasticizer, 100 parts of reinforcing filler and 6 parts of curing accelerator in a planetary machine, heating to 140 ℃, dehydrating for 3 hours under the vacuum degree of-0.090 to-0.098 MPa, and cooling to room temperature to obtain the base material. 40 parts of cross-linking agent, 20 parts of tackifier, 2 parts of catalyst and 20 parts of curing accelerator B are sequentially added into the base material, the temperature of the material is controlled to be lower than 40 ℃ by using cooling water during the process, and the material is discharged and packaged after being uniformly stirred.
Wherein, the basic polymer is 50000cs hydroxyl-terminated polydimethylsiloxane, the plasticizer is 350cs dimethyl polydimethylsiloxane, the reinforcing filler is fumed silica, the crosslinking agent is tetraethoxysilane oligomer, the tackifier is a mixture of KH540 and KH560, the catalyst is dibutyltin diacetate, the curing accelerator A is magnesium oxide, and the curing accelerator B is caproic acid.
When gluing, the temperature is set to 80 ℃.
Example 4
500 parts of basic polymer, 100 parts of plasticizer, 400 parts of reinforcing filler and 10 parts of curing accelerator are uniformly mixed in a planetary machine, the temperature is raised to 140 ℃, the mixture is dehydrated for 3 hours under the vacuum degree of-0.090 to-0.098 MPa, and the mixture is cooled to room temperature to obtain the base material. And (3) sequentially adding 30 parts of cross-linking agent, 15 parts of tackifier, 2 parts of catalyst and 40 parts of curing accelerator B into the base material, controlling the material temperature to be lower than 40 ℃ by using cooling water during the process, uniformly stirring, discharging and packaging.
Wherein, the base polymer is 50000cs alkoxy terminated polydimethylsiloxane, the plasticizer is 350cs dimethyl polydimethylsiloxane, the reinforcing filler is nano calcium, the cross-linking agent is a mixture of tetraethoxysilane and methyl triethoxysilane, the tackifier is a mixture of KH540 and A187, the catalyst is stannous octoate, the curing accelerator A is calcium hydroxide, and the curing accelerator B is lauric acid.
When gluing, the temperature is set to 80 ℃.
Example 5
Uniformly mixing 700 parts of base polymer, 300 parts of reinforcing filler and 10 parts of curing accelerator A in a planetary machine, heating to 130 ℃, dehydrating for 3 hours under the vacuum degree of-0.090 to-0.098 MPa, and cooling to room temperature to obtain the base material. Adding 25 parts of cross-linking agent, 15 parts of tackifier, 1 part of catalyst and 34 parts of curing accelerator B into the base material in sequence, controlling the material temperature to be lower than 40 ℃ by using cooling water in the period, uniformly stirring, discharging and packaging.
Wherein, the basic polymer is 20000cs hydroxyl-terminated polydimethylsiloxane, the plasticizer is 100cs dimethyl polydimethylsiloxane, the reinforcing filler is precipitated white carbon black, the cross-linking agent is a mixture of methyl orthosilicate and methyl triethoxysilane, the tackifier is a mixture of KH540 and KH560, the catalyst is an organic tin chelate, the curing accelerator A is zinc hydroxide, and the curing accelerator B is capric acid.
When gluing, the temperature is set to 80 ℃.
Comparative example 1
Mixing 400 parts of basic polymer, 100 parts of plasticizer and 500 parts of reinforcing filler uniformly in a planetary machine, heating to 130 ℃, dehydrating for 5 hours under the vacuum degree of-0.090 to-0.098 MPa, and cooling to room temperature to obtain the base material. And (3) sequentially adding 20 parts of cross-linking agent, 10 parts of tackifier and 2 parts of catalyst into the base material, controlling the temperature of the material to be lower than 40 ℃ by using cooling water in the period, uniformly stirring, discharging and packaging.
Wherein the base polymer is 2 kilo cs alkoxy-terminated polydimethylsiloxane, the plasticizer is 1000cs dimethyl polydimethylsiloxane, the reinforcing filler is nano calcium, the crosslinking agent is methyl trimethoxy silane, the tackifier is KH550, and the catalyst is dibutyltin dilaurate.
When gluing, the temperature is set to 80 ℃.
The samples of examples 1-5 and comparative example 1 were tested for their performance by the following specific test methods:
[ test of depth of cure ] A test plate made of polytetrafluoroethylene with wedge-shaped grooves was used to test the depth of cure of a sample for 24 hours under standard conditions [ temperature (23 + -2) ° C, relative humidity 55% ].
[ tensile bond Strength test ] an H-shaped test piece was prepared according to the method in GB16776-2005, and the tensile bond strength was measured for 2 hours and 24 hours under standard conditions by curing, respectively.
The test results are shown in Table 1.
TABLE 1 determination of the Properties of the samples of examples 1-5 and comparative example 1
As can be seen from Table 1, the curing depth of the vulcanized silicone structural adhesive can be remarkably improved after the curing accelerator A and the curing accelerator B are added, the curing depth of 24 hours is more than 10mm, and the vulcanized silicone structural adhesive has higher tensile bonding strength, can bear larger load and meets the requirement of structural bonding; the silicone adhesive without the curing accelerator is not only not high in curing depth, but also low in strength due to thin-layer curing.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core ideas. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The single-component room temperature vulcanized silicone structural adhesive is characterized by comprising the following components in parts by mass:
400-700 parts of a base polymer;
0-150 parts of a plasticizer;
100-500 parts of reinforcing filler;
20-40 parts of a crosslinking agent;
10-20 parts of a tackifier;
1-3 parts of a catalyst;
6-16 parts of a curing accelerator A;
20-50 parts of a curing accelerator B;
the curing accelerator A and the curing accelerator B can perform acid-base neutralization reaction at 60-80 ℃ to generate water.
2. The one-component room temperature vulcanizing silicone structural adhesive of claim 1, wherein the curing accelerator A is one of zinc oxide, calcium oxide, magnesium oxide, aluminum hydroxide, zinc hydroxide, calcium hydroxide and magnesium hydroxide.
3. The one-component room temperature vulcanizing silicone structural adhesive according to claim 1, wherein the curing accelerator B is one or more of caproic acid, caprylic acid, capric acid, lauric acid, palmitic acid and stearic acid.
4. The single-component room temperature vulcanizing silicone structural adhesive as claimed in claim 1, wherein the base polymer is alkoxy-terminated polydimethylsiloxane or dihydroxy polydimethylsiloxane with viscosity of 20000-80000 cs.
5. The one-component room temperature vulcanized silicone structural adhesive of claim 1, wherein the plasticizer is dimethyl polydimethylsiloxane with a viscosity of 100-1000 cs.
6. The single-component room temperature vulcanized silicone structural adhesive of claim 1, wherein the reinforcing filler is one or more of fumed silica, precipitated silica, and active nano calcium carbonate.
7. The single-component room temperature vulcanized silicone structural adhesive of claim 1, wherein the cross-linking agent is one or a mixture of methyl trimethoxy silane, methyl triethoxy silane, methyl orthosilicate, ethyl orthosilicate and ethyl orthosilicate oligomer; the tackifier is one or a mixture of more of KH540, KH550, KH560, A187 and KH 792.
8. The one-component room temperature vulcanizing silicone structural adhesive of claim 1, wherein the catalyst is one or more of dibutyltin dilaurate, dibutyltin diacetate, stannous octoate, titanate chelate, and organotin chelate.
9. The process for preparing a one-component room temperature vulcanizing silicone structural adhesive according to any one of claims 1 to 8, comprising the steps of:
(1) uniformly mixing a basic polymer, a plasticizer, a reinforcing filler and a curing accelerator A, heating to 130-150 ℃, dehydrating for 3-5 hours under the vacuum degree of-0.090-0.098 MPa, and cooling to room temperature to obtain a base material;
(2) and (3) adding a cross-linking agent, a tackifier, a catalyst and a curing accelerator B into the base material in sequence, controlling the temperature of the material to be lower than 40 ℃ by using cooling water in the period, uniformly stirring, discharging and packaging.
10. The method for using the one-component room temperature vulcanizing silicone structural adhesive as claimed in any one of claims 1 to 9, wherein the construction is performed by using an adhesive applying device with a heating function at the adhesive nozzle part, the sealant is heated at the adhesive nozzle part during the application, the heating temperature is set to 60 to 80 ℃, the time for the sealant to pass through the heating part is controlled, the whole section of the sealant is heated to the set temperature, and the sealant is directly applied to the construction part after coming out of the adhesive nozzle.
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| Title |
|---|
| 余先纯 等: "《木材胶黏剂与胶合技术》", 31 March 2011, 中国轻工业出版社 * |
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| CN111334246B (en) | 2022-03-29 |
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