CN116239990A - High-temperature-resistant organic silicon sealant and preparation method thereof - Google Patents
High-temperature-resistant organic silicon sealant and preparation method thereof Download PDFInfo
- Publication number
- CN116239990A CN116239990A CN202310428958.XA CN202310428958A CN116239990A CN 116239990 A CN116239990 A CN 116239990A CN 202310428958 A CN202310428958 A CN 202310428958A CN 116239990 A CN116239990 A CN 116239990A
- Authority
- CN
- China
- Prior art keywords
- parts
- component
- stirring
- hydrogen
- filler
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention discloses a high-temperature-resistant organic silicon sealant and a preparation method thereof. The composite material comprises a component A and a component B, wherein the component A is as follows: 100 parts of alpha, omega-dihydroxy polydimethylsiloxane, 5-40 parts of filler, 5-10 parts of hydrogen adsorbent, 1-3 parts of carbon fiber, 5-10 parts of vinyl fluorosilicone oil and 0.5-1 part of catalyst; the component B is as follows: 100 parts of hydrogen-containing polysilazane resin, 100-500 parts of diluent, 10-50 parts of water scavenger and 20-100 parts of filler. The sealant contains SiH-NH-SiH structure, can react with alpha, omega-dihydroxy polydimethylsiloxane to generate an elastomer, and hydrolyzes and eliminates redundant moisture and catalyst in a system, so that the generated elastomer has excellent high temperature resistance and high humidity resistance, and can react with hydroxyl on the surface of a material, thereby having excellent adhesive property on materials such as glass, ceramic, metal and the like.
Description
Technical Field
The invention belongs to the technical field of sealing materials, and particularly relates to a high-temperature-resistant organic silicon sealant and a preparation method thereof.
Background
The organic silicon polymer takes silicon oxide as a molecular main chain, the structure endows the material with excellent high-low temperature performance, and the organic silicon polymer is widely applied to industries such as electronics, electrical appliances, automobiles, illumination and the like, and is one of the sealant with the largest current dosage. The method can be cured at room temperature, the curing forms mainly comprise deacidification type, dealcoholization type, ketoxime removal type, acetone removal type, deamination type, dehydrogenation type and the like, and the condensation products mainly comprise small molecular acids, alcohols, ketoxime and the like. The existence of the residual condensation product, the organotin catalyst and water makes the sealant easily depolymerize under high temperature environment, especially under damp-heat environment, which limits the application of the sealant under high temperature and damp-heat environment. Although the dehydrogenation type sealant has relatively good high temperature resistance in a damp-heat environment, the cost is high when a platinum catalyst is adopted, the sealant is easy to poison and inactivate, so that the sealant is not solidified, and the high temperature resistance is reduced when an organotin catalyst is adopted. Meanwhile, the hydrogen generated in the solidification process of the dehydrogenation type sealant is easy to form bubbles, so that the mechanical property of the sealant is obviously reduced. In addition, the silane coupling agent is difficult to be additionally added into the double-component dehydrogenation type organic silicon sealant system, the adhesive property is relatively poor, the double-component dehydrogenation type organic silicon sealant needs to be matched with an adhesive treatment agent when in use, and the construction is relatively complex. Because the main chain structure of the system is silicon-oxygen, the performance of the system for resisting nonpolar medium is relatively poor, and the system is difficult to apply in the environment of contacting with nonpolar medium such as oil.
Therefore, development of an organosilicon sealant which is resistant to high temperature, wet heat and nonpolar medium is extremely necessary.
Disclosure of Invention
The invention aims to provide a high-temperature-resistant organic silicon sealant and a preparation method thereof.
The high-temperature-resistant organosilicon sealant comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 100: (1-3); the component A comprises the following components in parts by weight: 100 parts of alpha, omega-dihydroxy polydimethylsiloxane, 5-40 parts of filler, 5-10 parts of hydrogen adsorbent, 1-3 parts of carbon fiber, 5-10 parts of vinyl fluorosilicone oil and 0.5-1 part of catalyst;
the component B comprises the following components in parts by weight: 100 parts of hydrogen-containing polysilazane resin, 100-500 parts of diluent, 10-50 parts of water scavenger and 20-100 parts of filler.
The viscosity of the alpha, omega-dihydroxy polydimethylsiloxane is 40-120 Pa.s at 25 ℃. The higher the viscosity of the liquid organic silicon rubber is, the higher the relative molecular mass of the liquid organic silicon rubber is, the less the dosage of the dehydrogenation crosslinking agent is needed, the amount of generated hydrogen is also lower, the prepared sealant has less foaming, and meanwhile, the prepared sealant has relatively good mechanical property.
The filler is one or a mixture of fumed silica or precipitated silica treated by D3F siloxane. A process for preparing D3F silicone treated fumed silica: placing silicon dioxide into a stirring kettle, spraying 10% of D3F siloxane liquid by mass of the silicon dioxide into the stirring kettle, and stirring at 100-120 ℃ for 4-5 h. The D3F siloxane treated silicon dioxide has good compatibility with organic silicon rubber, the mechanical property of the prepared sealant is relatively better, and the introduction of fluorine atoms increases the polarity of the sealant, so that the nonpolar medium resistance of the sealant can be improved.
The hydrogen adsorbent is a platinum-carrying 5A molecular sieve.
The carbon fiber is a chopped carbon fiber, and the length-diameter ratio of the carbon fiber is 15:1, the diameter is 7-10 mu m.
The viscosity of the vinyl fluorosilicone oil is 0.05-0.5 Pa.s. On the one hand, the vinyl fluorosilicone oil has good compatibility with the organic silicon rubber, can effectively improve the viscosity of the sealant, and is convenient for construction. In addition, as the vinyl fluorosilicone oil can react with the hydrogen-containing polysilazane resin, the vinyl fluorosilicone oil is a potential reactive diluent for the organic silicon sealant, and simultaneously, the nonpolar medium resistance of the sealant is further improved.
The catalyst is dibutyl tin diacetate.
The hydrogen-containing polysilazane resin is a compound shown in a formula I and a formula II according to a mass ratio of 1:1, a mixture of two or more of the above-mentioned materials; the molecular weight of the compounds shown in the formula I and the formula II is 800-900; in the formula II, x is 8-12, and y is 2-6;
the diluent is toluene; the water scavenger is CH-6 environment-friendly water scavenger.
The preparation method of the high-temperature-resistant organic silicon sealant comprises the following steps:
and (3) preparation of the component A: weighing alpha, omega-dihydroxyl polydimethylsiloxane, filler and carbon fiber according to the mass portion ratio, putting the materials into a stirrer for stirring, vacuumizing and mixing at 100 ℃, stirring at the rotation speed of 300-800 r/min for 60-90 min, adding vinyl fluorosilicone oil, catalyst and hydrogen adsorbent according to the mass portion when the temperature is reduced below 60 ℃, vacuumizing to keep the vacuum degree of not more than-0.08 MPa for 5-10 min, then starting stirring, and continuously stirring at the rotation speed of 300-800 r/min for 60-90 min to obtain the component A;
and (3) preparation of a component B: weighing the diluent, the filler and the water scavenger according to the mass portion ratio, putting the diluent, the filler and the water scavenger into a stirrer for stirring and vacuumizing for mixing, stirring for 30-60 min at the rotating speed of 300-800 r/min, adding the hydrogen-containing polysilazane resin according to the mass portion ratio, and vacuumizing and stirring for 30-60 min at the rotating speed of 300-800 r/min to obtain the component B.
The invention has the beneficial effects that: the invention adopts the hydrogen-containing polysilazane resin to react with alpha, omega-dihydroxyl polydimethylsiloxane to generate the elastomer, the hydrogen-containing polysilazane resin contains SiH-NH-SiH structure, on one hand, the hydrogen-containing polysilazane resin can react with the alpha, omega-dihydroxyl polydimethylsiloxane to generate the elastomer, on the other hand, the hydrogen-containing polysilazane resin can hydrolyze and eliminate redundant moisture and catalyst in the system, so that the generated elastomer has excellent high temperature resistance and damp-heat resistance, and simultaneously, the structure can react with hydroxyl on the surface of the material, thereby having excellent adhesive property on the materials such as glass, ceramics, metal and the like without using adhesion promoters such as silane coupling agents and the like. The platinum-carrying 5A molecular sieve is used as a hydrogen adsorbent, so that hydrogen in a system can be effectively adsorbed, and the mechanical property and the high temperature resistance of the sealant are improved. The hardness of the organosilicon sealant is improved by adopting chopped carbon fibers. In addition, because the compatibility of the chopped carbon fiber and the organic silica gel is poor, hydrogen generated by the system reaction can overflow along the surface of the chopped carbon fiber, thereby effectively reducing the foaming problem of the sealant.
Detailed Description
The present invention will be described more fully hereinafter in order to facilitate an understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
In the following examples, the hydrogen adsorbent used was a platinum-carrying 5A molecular sieve prepared by blending a 1:1 volume ratio of 5A molecular sieve to an aqueous solution of chloroplatinic acid, wherein the platinum content was 1% relative to the mass of 5A molecular sieve, mixing for 8 hours, drying at 100℃and vacuum-pumping at 350℃for at least 4 hours before use. The water scavenger is environment-friendly water scavenger produced by the company of the Ultrafiltration industry, and the model is the model of the Behcet's Siberian Country. The molecular weight of the compound of formula I is about 850, and the molecular weight of the compound of formula II is about 880; in the formula II, x is 10, and y is 4; the compound shown in the formula I is purchased from Anhui Aijita silicone oil Co., ltd., product number: IOTA-PHPS; compounds of formula II were purchased from the limited public of amikacin, cat No.: IOTA-9150.
Example 1
The high-temperature-resistant organic silicon seal in the embodiment comprises the following components in parts by mass:
and (3) a component A: 100 parts of alpha, omega-dihydroxy polydimethylsiloxane (viscosity of 40 Pa.s), 40 parts of D3F silicone treated fumed silica, 10 parts of hydrogen adsorbent, 1 part of carbon fiber (the length-diameter ratio of which is 15:1 and the diameter of which is 8 mu m), 10 parts of vinyl fluorine oil (viscosity of 0.05 Pa.s) and 0.5 part of dibutyltin diacetate;
and the component B comprises the following components: 100 parts of hydrogen-containing polysilazane resin (a mixture of compounds shown in formula I and formula II according to a mass ratio of 1:1), 500 parts of diluent (toluene), 50 parts of CH-6 environment-friendly water scavenger and 100 parts of D3F silicone treated fumed silica.
The preparation method of the component A comprises the following steps:
weighing alpha, omega-dihydroxyl polydimethylsiloxane, fumed silica treated by D3F siloxane and carbon fiber according to the mass portion ratio, putting the fumed silica and the carbon fiber into a stirrer for stirring and vacuumizing and mixing at 100 ℃, stirring at the rotating speed of 300 r/min for 90min, then adding vinyl fluorosilicone oil, dibutyltin diacetate and a hydrogen adsorbent according to the mass portion when the temperature is reduced to below 60 ℃, vacuumizing to ensure that the vacuum degree is not more than-0.08 MPa, keeping for 5min, then starting stirring, and continuing stirring at the rotating speed of 300 r/min for 90min to obtain the component A.
The preparation method of the component B comprises the following steps:
weighing the air-phase silicon dioxide treated by toluene and D3F siloxane and the CH-6 environment-friendly water scavenger according to the mass portion ratio, putting the air-phase silicon dioxide and the CH-6 environment-friendly water scavenger into a stirrer for stirring and vacuumizing for mixing, stirring for 30min at the rotating speed of 800 rpm, adding the hydrogen-containing polysilazane resin according to the mass portion, and vacuumizing for 60min at the rotating speed of 300 rpm to obtain the component B.
When in use, the A component and the B component are mixed according to the mass ratio of 100:2 mixing.
Example 2
The high-temperature-resistant organic silicon sealant in the embodiment comprises the following components in parts by mass:
and (3) a component A: 100 parts of alpha, omega-dihydroxy polydimethylsiloxane (viscosity 120 Pa.s), 5 parts of D3F siloxane treated precipitated silica, 5 parts of hydrogen adsorbent, 3 parts of carbon fiber (with an aspect ratio of 15:1 and a diameter of 9 μm), 5 parts of vinyl fluorosilicone oil (viscosity 0.05 Pa.s) and 1 part of dibutyltin diacetate.
And the component B comprises the following components: 100 parts of hydrogen-containing polysilazane resin (a mixture of compounds shown in formula I and formula II according to a mass ratio of 1:1), 500 parts of diluent (toluene), 50 parts of CH-6 environment-friendly water scavenger and 80 parts of D3F siloxane treated precipitated silica.
The preparation method of the component A comprises the following steps:
weighing alpha, omega-dihydroxyl polydimethylsiloxane, precipitated silica treated by D3F siloxane and carbon fiber according to the mass portion ratio, putting the precipitated silica and the carbon fiber into a stirrer, stirring and vacuumizing at 100 ℃, stirring at 800 rpm for 60min, adding vinyl fluorosilicone oil, dibutyltin diacetate and a hydrogen adsorbent according to the mass portion when the temperature is reduced to below 60 ℃, vacuumizing to ensure that the vacuum degree is not more than-0.08 MPa, keeping for 5min, starting stirring, and continuously stirring at 800 rpm for 60min to obtain the component A.
The preparation method of the component B comprises the following steps:
weighing toluene, precipitated silica treated by D3F siloxane and CH-6 environment-friendly water scavenger according to the mass fraction ratio, putting the mixture into a stirrer for stirring, vacuumizing and mixing, stirring for 60min at the rotating speed of 300 rpm, adding hydrogen-containing polysilazane resin according to the mass fraction ratio, and vacuumizing and mixing for 60min at the rotating speed of 300 rpm to obtain the component B.
When in use, the A component and the B component are mixed according to the mass ratio of 100: 1.
Example 3
The high-temperature-resistant organic silicon sealant in the embodiment comprises the following components in parts by mass:
and (3) a component A: 100 parts of alpha, omega-dihydroxy polydimethylsiloxane (viscosity of 50 Pa.s), 20 parts of D3F siloxane treated precipitated silica, 5 parts of hydrogen adsorbent, 2 parts of carbon fiber (with an aspect ratio of 15:1 and a diameter of 10 mu m), 8 parts of vinyl fluorosilicone oil (viscosity of 0.5 Pa.s) and 0.5 part of dibutyltin diacetate.
And the component B comprises the following components: 50 parts of hydrogen-containing polysilazane resin (a mixture of compounds shown in formula I and formula II according to a mass ratio of 1:1), 100 parts of diluent (toluene), 10 parts of CH-6 environment-friendly water scavenger and 20 parts of D3F siloxane treated precipitated silica.
The preparation method of the component A comprises the following steps:
weighing alpha, omega-dihydroxyl polydimethylsiloxane, precipitated silica treated by D3F siloxane and carbon fiber according to the mass portion ratio, putting the precipitated silica and the carbon fiber into a stirrer, stirring and vacuumizing at 100 ℃, stirring at 500 rpm for 60min, adding vinyl fluorosilicone oil, dibutyltin diacetate and a hydrogen adsorbent according to the mass portion when the temperature is reduced to below 60 ℃, vacuumizing to ensure that the vacuum degree is not more than-0.08 MPa, keeping for 5min, starting stirring, and continuously stirring at 500 rpm for 60min to obtain the component A.
The preparation method of the component B comprises the following steps:
weighing the toluene, the precipitated silica treated by the D3F siloxane and the CH-6 environment-friendly water scavenger according to the mass portion ratio, putting the mixture into a stirrer for stirring and vacuumizing for mixing, stirring for 60min at the rotating speed of 300 r/min, adding the perhydro and part of hydrogen-containing polysilazane resin, and vacuumizing for 60min at the rotating speed of 300 r/min to obtain the component B.
Example 4
The high-temperature-resistant organic silicon sealant in the embodiment comprises the following components in parts by mass:
and (3) a component A: 100 parts of alpha, omega-dihydroxy polydimethylsiloxane (viscosity 80 Pa.s), 20 parts of D3F silicone treated fumed silica, 8 parts of a hydrogen adsorbent, 1 part of carbon fiber (the length-diameter ratio of which is 15:1 and the diameter of which is 10 mu m), 8 parts of vinyl fluorosilicone oil (viscosity 0.2 Pa.s) and 0.6 part of dibutyltin diacetate.
And the component B comprises the following components: 100 parts of hydrogen-containing polysilazane resin (a mixture of compounds shown in formula I and formula II according to a mass ratio of 1:1), 400 parts of diluent (toluene), 40 parts of CH-6 environment-friendly water scavenger and 40 parts of D3F siloxane treated precipitated silica.
The preparation method of the component A comprises the following steps:
weighing alpha, omega-dihydroxyl polydimethylsiloxane, fumed silica treated by D3F siloxane and carbon fiber according to the mass portion ratio, putting the fumed silica and the carbon fiber into a stirrer for stirring and vacuumizing and mixing at 100 ℃, stirring at the rotating speed of 500 r/min for 60min, then adding vinyl fluorosilicone oil, dibutyltin diacetate and a hydrogen adsorbent according to the mass portion when the temperature is reduced to below 60 ℃, vacuumizing to ensure that the vacuum degree is not more than-0.08 MPa, keeping for 5min, then starting stirring, and continuing stirring at the rotating speed of 500 r/min for 60min to obtain the component A.
The preparation method of the component B comprises the following steps:
weighing toluene, precipitated silica treated by D3F siloxane and CH-6 environment-friendly water scavenger according to the mass fraction ratio, putting the mixture into a stirring machine, stirring the mixture under vacuum, stirring the mixture for 60min at the rotating speed of 500 revolutions per minute, adding hydrogen-containing polysilazane resin according to the mass fraction ratio, and then stirring the mixture under vacuum at the rotating speed of 500 revolutions per minute for 60min to obtain the component B.
Comparative example 1
The high-temperature-resistant organic silicon seal in the embodiment comprises the following components in parts by mass:
and (3) a component A: 100 parts of alpha, omega-dihydroxy polydimethylsiloxane (viscosity 40 Pa.s), 40 parts of fumed silica, 10 parts of silicone oil (viscosity 0.5 Pa.s) and 0.5 part of catalyst.
And the component B comprises the following components: 100 parts of tetraethyl orthosilicate and 5 parts of fumed silica.
The preparation method of the component A comprises the following steps:
the alpha, omega-dihydroxyl polydimethylsiloxane and the filler are weighed according to the mass portion ratio, put into a stirrer to be stirred, vacuumized and mixed at 100 ℃, stirred for 90min at the rotation speed of 300 r/min, then added with silicone oil and catalyst according to the mass portion when the temperature is reduced below 60 ℃, and continuously stirred for 90min at the rotation speed of 300 r/min to obtain the component A.
The preparation method of the component B comprises the following steps:
the preparation method comprises the steps of weighing tetraethyl orthosilicate and silicon dioxide according to the mass portion ratio, putting the tetraethyl orthosilicate and the silicon dioxide into a stirrer, stirring, vacuumizing and mixing, and stirring for 60min at the rotating speed of 500 rpm.
When in use, the A component and the B component are mixed according to the mass ratio of 100:2 mixing.
Comparative example 2
The high-temperature-resistant organic silicon seal in the embodiment comprises the following components in parts by mass:
and (3) a component A: 100 parts of alpha, omega-dihydroxy polydimethylsiloxane (viscosity 40 Pa.s), 40 parts of fumed silica, 10 parts of silicone oil (viscosity 0.5 Pa.s) and 0.5 part of catalyst;
and the component B comprises the following components: 100 parts of methyl hydrogen silicone oil (hydrogen content 1.4 wt%) and 10 parts of fumed silica.
The preparation method of the component A comprises the following steps:
the alpha, omega-dihydroxyl polydimethylsiloxane and the filler are weighed according to the mass portion ratio, put into a stirrer to be stirred, pumped and mixed at the temperature of 100 ℃ for 90min under the rotation speed of 300 r/min, then silicone oil and a catalyst are added according to the mass portion when the temperature is reduced to below 60 ℃, and the component A is obtained after the stirring is continued for 90min under the rotation speed of 300 r/min.
The preparation method of the component B comprises the following steps:
100 parts of methyl hydrogen silicone oil is weighed according to the mass portion ratio, 5 parts of fumed silica is put into a stirrer to be stirred and vacuumized for mixing, and the mixture is stirred for 30min at the rotating speed of 500 revolutions per minute, so that the component B is obtained.
When in use, the A component and the B component are mixed according to the mass ratio of 100:2 mixing.
The performance comparisons of the above examples and comparative examples are shown in Table 1. The surface drying time is measured according to GB/T513477.5-2003, the tensile property is measured according to GB/T528-2009, the density is measured according to GB/T533-2008, the shear strength is measured according to GB/T7124-2008, and the hardness is measured according to GB/T531-1999.
Table 1 key performance data table for each of the examples and comparative sealants
As can be seen from Table 1, the hardness of examples 1-4 is comparable to that of comparative examples 1-2, and the materials such as stainless steel and glass have good adhesion properties to aluminum alloy, while the materials such as stainless steel, titanium alloy and quartz glass have poor adhesion properties due to interfacial failure in shearing. The densities of examples 1-4 were comparable to the densities of comparative examples 1-2. After heat aging for 8 hours at 200 ℃, the hardness of the sealant of the embodiment 1-4 is slightly increased, and no degradation reaction occurs. The data table shows that the sealant provided by the invention has good high-temperature resistance and good adhesion performance to various materials without using adhesion promoters such as silane coupling agents.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The high-temperature-resistant organosilicon sealant is characterized by comprising a component A and a component B, wherein the mass ratio of the component A to the component B is 100: (1-3); the component A comprises the following components in parts by weight: 100 parts of alpha, omega-dihydroxy polydimethylsiloxane, 5-40 parts of filler, 5-10 parts of hydrogen adsorbent, 1-3 parts of carbon fiber, 5-10 parts of vinyl fluorosilicone oil and 0.5-1 part of catalyst;
the component B comprises the following components in parts by weight: 100 parts of hydrogen-containing polysilazane resin, 100-500 parts of diluent, 10-50 parts of water scavenger and 20-100 parts of filler.
2. The high temperature resistant silicone sealant according to claim 1, wherein the α, ω -dihydroxy polydimethylsiloxane has a viscosity of 40 to 120 Pa-s at 25 ℃.
3. The high temperature resistant silicone sealant according to claim 1, wherein the filler is one of fumed silica or precipitated silica treated with D3F silicone or a mixture thereof.
4. The high temperature resistant silicone sealant according to claim 1, wherein the hydrogen adsorbent is a platinum-loaded 5A molecular sieve.
5. The high temperature resistant silicone sealant according to claim 1, wherein the carbon fiber is a chopped carbon fiber having an aspect ratio of 15:1, the diameter is 7-10 mu m.
6. The high temperature resistant silicone sealant according to claim 1, wherein the vinyl fluorosilicone oil has a viscosity of 0.05 to 0.5 Pa-s.
7. The high temperature resistant silicone sealant according to claim 1, wherein the catalyst is dibutyltin diacetate.
8. The high temperature resistant organosilicon sealant according to claim 1, wherein the hydrogen-containing polysilazane resin is a compound shown in a formula I and a formula II according to a mass ratio of 1:1, a mixture of two or more of the above-mentioned materials; the molecular weight of the compounds shown in the formula I and the formula II is 800-900; in the formula II, x is 8-12, and y is 2-6;
9. the high temperature resistant silicone sealant according to claim 1, wherein the diluent is toluene; the water scavenger is CH-6 environment-friendly water scavenger.
10. The method for preparing the high-temperature-resistant organic silicon sealant according to claim 1, which is characterized by comprising the following steps:
and (3) preparation of the component A: weighing alpha, omega-dihydroxyl polydimethylsiloxane, filler and carbon fiber according to the mass portion ratio, putting the materials into a stirrer for stirring, vacuumizing and mixing at 100 ℃, stirring at the rotation speed of 300-800 r/min for 60-90 min, adding vinyl fluorosilicone oil, catalyst and hydrogen adsorbent according to the mass portion when the temperature is reduced below 60 ℃, vacuumizing to keep the vacuum degree of not more than-0.08 MPa for 5-10 min, then starting stirring, and continuously stirring at the rotation speed of 300-800 r/min for 60-90 min to obtain the component A;
and (3) preparation of a component B: weighing the diluent, the filler and the water scavenger according to the mass portion ratio, putting the diluent, the filler and the water scavenger into a stirrer for stirring and vacuumizing for mixing, stirring for 30-60 min at the rotating speed of 300-800 r/min, adding the hydrogen-containing polysilazane resin according to the mass portion ratio, and vacuumizing and stirring for 30-60 min at the rotating speed of 300-800 r/min to obtain the component B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310428958.XA CN116239990A (en) | 2023-04-20 | 2023-04-20 | High-temperature-resistant organic silicon sealant and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310428958.XA CN116239990A (en) | 2023-04-20 | 2023-04-20 | High-temperature-resistant organic silicon sealant and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116239990A true CN116239990A (en) | 2023-06-09 |
Family
ID=86628010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310428958.XA Pending CN116239990A (en) | 2023-04-20 | 2023-04-20 | High-temperature-resistant organic silicon sealant and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116239990A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117659862A (en) * | 2023-12-18 | 2024-03-08 | 北京和尔泰新材料科技有限公司 | High-temperature-resistant protective coating and preparation and use methods thereof |
-
2023
- 2023-04-20 CN CN202310428958.XA patent/CN116239990A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117659862A (en) * | 2023-12-18 | 2024-03-08 | 北京和尔泰新材料科技有限公司 | High-temperature-resistant protective coating and preparation and use methods thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108484803B (en) | Silane-terminated polymer and moisture-cured adhesive composition prepared from same | |
| CN110577747B (en) | Room temperature vulcanized fluorosilicone rubber and preparation method thereof | |
| CN116239990A (en) | High-temperature-resistant organic silicon sealant and preparation method thereof | |
| CN108314990B (en) | High-strength high-temperature-resistant silicone sealant and preparation method thereof | |
| CN109096974B (en) | Transparent high-strength silane modified polyether sealant | |
| CN109400870B (en) | Modified polyether resin and preparation method and application thereof | |
| CN114702676B (en) | Single-component low-viscosity quick-solid dealcoholization RTV silicone rubber and preparation method thereof | |
| CN111057519A (en) | Low-temperature tear-resistant silicone sealant and preparation method thereof | |
| CN112210341B (en) | Double-vulcanization system building sealant and preparation method thereof | |
| JPH0645755B2 (en) | Material that crosslinks to an elastomer at room temperature, method for producing the same, and paint-compatible sealant containing the material | |
| CN114196372B (en) | Low-viscosity high-strength transparent dealcoholized organic silicon sealant and production method thereof | |
| CN115772264B (en) | Alkoxy-terminated polysiloxane with self-adhesive property, and preparation method and application thereof | |
| CN114316897A (en) | Silicone sealant and preparation method thereof | |
| CN103436028B (en) | Room temperature curing type one-component thermostable silica gel and preparation method thereof | |
| CN115926741A (en) | Organic silicon adhesive for full lamination of display of plastic cover plate and preparation method thereof | |
| CN114774072A (en) | Preparation method of oil-leakage-free silicone sealant | |
| CN113956790A (en) | Organic silicon coating and preparation method thereof | |
| CN112239643A (en) | Neutral transparent silicone adhesive and preparation method thereof | |
| CN111073576B (en) | High-functional silane modified polyether sealant | |
| CN112375508B (en) | Curing agent and two-component silicone sealant using same | |
| CN110819114B (en) | Cushion-free rubber for automobile engine and preparation method thereof | |
| CN116023901B (en) | Self-repairing silicone sealant and preparation and self-repairing method thereof | |
| CN118085802A (en) | Single-component ketoxime-removing silicone sealant containing sulfhydryl-amino and preparation method thereof | |
| CN115895556A (en) | Silane modified polyether adhesive with high tear strength and preparation method thereof | |
| CN118146698A (en) | High-stability waterproof weather-resistant coating and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |