307 results about "Silicone sealant" patented technology

The invention belongs to the technical field of adhesives, and particularly discloses a single-component silicone sealant for stainless steel bonding and a preparation method thereof, and the single-component silicone sealant comprises the following components by weight: 50-60 parts of alpha, omega-dihydroxy polydimethylsiloxane; 10 to 15 parts of a polydopamine coated silicon carbide nanowire; 5 to 15 parts of modified nano aluminum oxide gel; 5 to 10 parts of methyltris (methylethylketoxime) silane; 1 to 3 parts of dodecyl tris (methylethylketoxime) silane; 0.03 to 0.3 part of a coordination enhanced organic tin catalyst; and 8-14 parts of a plasticizer. According to the single-component silicone sealant for stainless steel bonding and the preparation method of the single-component silicone sealant, the modified nanometer aluminum oxide gel is selected, the bonding performance of stainless steel in a humid and hot environment is promoted and improved, the silicon carbide nanowire is coated with polydopamine, the bonding performance of the stainless steel is effectively improved, and the single-component silicone sealant can be widely applied to various indoor and outdoor scenes.

The invention discloses a high-elasticity anti-aging foamed silica gel sealing element, and belongs to the technical field of sealing materials. The silicone rubber is prepared from raw materials including methyl vinyl silicone rubber, fumed silica, hydroxyl-terminated polydimethylsiloxane and the like according to specific parts by weight through the processes of mixing, foaming vulcanization and the like. The apparent density of the sealing element is 0.3-0.6 g / cm < 3 >, the Shore A hardness is 25-45 degrees, the tensile strength is larger than or equal to 2.5 MPa, the elongation at break is larger than or equal to 350%, the performance retention rate is high after the sealing element is aged for 1000 h at the temperature of 150 DEG C, and the sealing element has excellent elasticity and aging resistance. The surface of the anti-slip sealing gasket can be provided with anti-slip textures to meet sealing requirements in the fields of automobiles, electronics and the like, and is long in service life and high in practicability.

The invention relates to the technical field of silicone rubber sealing materials, and discloses a fast-curing matte silicone sealant and a preparation method thereof.The silicone sealant is prepared from, by mass, 100 parts of alpha, omega-dihydroxy polydimethylsiloxane, 5-15 parts of a reactive plasticizer, 70-120 parts of calcium carbonate, 5-10 parts of a cross-linking agent, 1-5 parts of a coupling agent, 0.5 part of a catalyst and 0.5-1 part of a vulcanization accelerator; 0.2 to 1.5 parts of a reaction type matte agent solution; the reaction type matte agent solution is a mixture of hydroxylated eleostearic acid triglyceride and a cross-linking agent. The silicone sealant prepared by the invention has the advantages of smooth surface, excellent matte effect, weather aging resistance, thixotropy, rapid curing and the like, can be used as a sealing material for high-end buildings, and has a wide application prospect.

The invention belongs to the technical field of silicone sealants, and particularly discloses a transparent silicone sealant and a preparation method thereof. The transparent silicone sealant is prepared from the following raw materials in parts by weight: 100 parts of hydroxyl-terminated polydimethylsiloxane; 8-12 parts of a diluent; 6-10 parts of a filler; 6-10 parts of a cross-linking agent; 1-3 parts of a self-made coupling agent; 0.1 to 0.3 part of a catalyst; wherein the self-made coupling agent is prepared by compounding gamma-aminopropyl trimethoxy silane and an amino silane oligomer, and the self-made coupling agent is prepared by compounding the gamma-aminopropyl trimethoxy silane and the amino silane oligomer; the mass ratio of the gamma-aminopropyl trimethoxy silane to the amino silane oligomer is (1: 1)-(1: 4). According to the invention, the modulus, heat resistance and wet adhesive force of a finally cured coating can be obviously improved, and the coating has very strong storage stability, is not easy to generate performance change in a storage process, and is beneficial to actual production control and long-term storage.

A low-modulus, high-resilience modified alcohol-based silicone sealant, its preparation method, and its application are disclosed, relating to the field of sealant materials technology. The silicone sealant comprises the following components in parts by weight: 100 parts of α,ω-alkoxysilane ethylidene-terminated polydimethylsiloxane, 30-80 parts of plasticizer, 80-150 parts of reinforcing filler, 0.5-20 parts of silane crosslinking agent, 0.5-10 parts of silane tackifier, and 0.01-1 part of Lewis acid catalyst; wherein the plasticizer is α-alkoxysilane ethylidene-terminated polydimethylsiloxane. The low-modulus, high-resilience silicone sealant of this invention exhibits fast surface drying speed, low modulus, high elastic recovery rate, good adhesion, and weather resistance.

The application discloses a kind of flame-retardant mildew-proof prepolymer, transparent flame-retardant mildew-proof silicone sealant and preparation method thereof.The flame-retardant mildew-proof prepolymer is prepared from raw materials including the following components by weight: mildew-proof agent 0.5-10 parts, flame retardant 20-50 parts, tackifier composition 0.2-2 parts;The tackifier composition is composed of alkyl acetoacetate, trimethylsilyl ethyl acetate, 3-isocyanate propyl trimethoxysilane and polyether silicone oil.The transparent flame-retardant mildew-proof silicone sealant is prepared from raw materials including the following components: alkyl alkoxy-terminated polydimethylsiloxane, white carbon black, the flame-retardant mildew-proof prepolymer, crosslinking agent, catalyst, coupling agent.The transparent flame-retardant mildew-proof silicone sealant prepared by the application not only has very high transparency, but also has excellent flame-retardant effect, long-lasting mildew-resistant and antibacterial properties, and good bonding stability and mechanical strength.

This invention provides an organosilicon sealant composition for anti-fog automotive lights and its preparation method. The organosilicon sealant composition for anti-fog automotive lights comprises the following components: α,ω-dihydroxy polydimethylsiloxane, a first crosslinking agent, a second crosslinking agent, a catalyst, a filler, a coupling agent, and a plasticizer. The first crosslinking agent has 3 alkoxy functional groups, the second crosslinking agent has ≥4 alkoxy functional groups, and the D3-D10 content of α,ω-dihydroxy polydimethylsiloxane is 0.01-0.05 wt%. This invention utilizes a polyalkyloxysilane derivative prepared from a tertiary amine polyol and an isocyanate-based silane coupling agent as a non-volatile second crosslinking agent, which has high activity, does not reduce the reaction rate, and can reduce the amount of the volatile first crosslinking agent. Furthermore, using α,ω-dihydroxy polydimethylsiloxane with a low D3-D10 content as the base adhesive can further reduce volatile components, making the automotive lights less prone to fogging.

The utility model provides an ultralow-energy-consumption building external window airtight structure which comprises a structure base layer, an external window and an energy-saving auxiliary frame. The energy-saving auxiliary frame is pre-buried at the edge, connected with the outer window, of the structure base layer, and the energy-saving auxiliary frame transversely crosses the indoor side and the outdoor side of the outer window; the outer window is detachably connected to the energy-saving auxiliary frame; the waterproof vapor-proof film is laid on the joint face of the indoor side of the energy-saving auxiliary frame and the structural base layer. The waterproof vapor-permeable film is laid on the joint surface of the outdoor side of the energy-saving auxiliary frame and the structural base layer; the closing-up positions of the waterproof vapor-proof film and the waterproof vapor-permeable film are coated with silicone sealants. The air tightness of the outer window is guaranteed, indoor and outdoor cold and hot air exchange and cold and hot energy loss are reduced, and the energy-saving and emission-reducing effects of a building are achieved; the building sound insulation performance and the air quality are improved, the energy use efficiency is improved, meanwhile, water vapor is discharged outdoors in time, the energy-saving auxiliary frame of the outer window is protected against corrosion, the service life of the outer window and the building is prolonged, and an effective guarantee is provided for long-term use of the building.

This utility model belongs to the technical field of chemical production equipment and discloses a waste gas treatment device for silicone sealant production. It includes suction hoods installed at various points on the production line, which are sequentially connected via pipes to a dust collector, an incinerator, a wet electrostatic precipitator, an alkaline scrubbing tower, an induced draft fan, and a chimney. The outlet of the dust collector is connected to the inlet of the incinerator, the outlet of the incinerator is connected to the inlet of the wet electrostatic precipitator, the outlet of the wet electrostatic precipitator is connected to the inlet of the alkaline scrubbing tower, the outlet of the alkaline scrubbing tower is connected to the inlet of the induced draft fan, and the outlet of the induced draft fan is connected to the inlet of the chimney. This utility model can treat the waste gas generated during silicone sealant production, ensuring environmental and personal safety.

Provided is a hot melt adhesive for insulating glass spacer, prepared from raw materials comprising the following components: 1-10 parts by weight of butyl rubber, 25-50 parts by weight of a polyisobutylene mixture; 5-15 parts by weight of a tackifying resin; 1-15 parts by weight of a tackifier; 5-15 parts by weight of a polymer; 0.1-1 part by weight of a lubricant; 0.1-1 part by weight of an antioxidant; 15-50 parts by weight of a filler; 1-10 parts by weight of a water absorbent; and 5-25 parts by weight of carbon black. Compared with the prior art, in the hot melt adhesive for insulating glass spacer provided in the present disclosure, components with specific contents are used, such that relatively good overall interaction is achieved, the thixotropy of the product is good, and the adhesion to both silicone sealant and glass is excellent.

The application provides a silicone sealant not prone to discoloration and a preparation method thereof, and relates to the technical field of silicone sealants. The silicone sealant comprises the following components in parts by weight: 100 parts of hydroxyl-terminated polydimethylsiloxane, 70-130 parts of fillers, 0-20 parts of dimethyl silicone oil, 5-12 parts of a crosslinking agent, 1-3 parts of a coupling agent oligomer, 0.5-3 parts of an epoxy coupling agent and 0.01-0.5 parts of a catalyst. The application adopts a customized amino coupling agent oligomer with a specific structure, and optimizes the formula to achieve optimal effects by matching 107 glue, fillers and the like at a proper ratio. The application can improve the poor high-temperature tensile bonding property and the discoloration under high temperature of the existing silicone sealant, realizes good high-temperature bonding property and is not prone to discoloration, and in particular, the discoloration phenomenon under high-temperature application scenarios is obviously improved, thereby meeting the high requirements in special building, automobile, electronic and electrical applications and the like.

The present invention provides a dealcoholized silicone sealant with rapid initial curing and a preparation method thereof, comprising the following steps: dispersing a metal-organic framework (MIL-101), a silane coupling agent, and calcium carbonate in an organic solvent and reacting for 5 to 7 hours to obtain MIL-101@CaCO3; and mixing and dispersing α,ω-dihydroxy polydimethylsiloxane, alkoxy-terminated polydimethylsiloxane, MIL-101@CaCO3, a crosslinking agent, a coupling agent, and a catalyst to obtain the dealcoholized silicone sealant. The present invention significantly increases the migration rate of water vapor within the filler by modifying CaCO3 with the metal-organic framework (MIL-101). The diffusion coefficient of water vapor within the filler is 0.112 cm at 25°C and 30% relative humidity. 2 / s, and ensure the mechanical strength; on this basis, it is combined with alkoxy-terminated polydimethylsiloxane to further improve the curing rate, and the curing depth can reach more than 1mm in 6 hours.

The application discloses a high-temperature-resistant silicone sealant and a preparation method thereof. The sealant comprises A component and B component. The A component is prepared from 100 parts of alpha, omega-dihydroxypolydimethylsiloxane, 5-40 parts of a filler, 5-10 parts of a hydrogen adsorbent, 1-3 parts of carbon fiber, 5-10 parts of vinyl fluorosilicone oil and 0.5-1 part of a catalyst. The B component is prepared from 100 parts of hydrogen-containing polysilazane resin, 100-500 parts of a diluent, 10-50 parts of a water-removing agent and 20-100 parts of a filler. The sealant contains SiH-NH-SiH structure, can react with alpha, omega-dihydroxypolydimethylsiloxane to generate elastomers, can eliminate excessive water and catalyst in the system through hydrolysis, and can make the generated elastomers have excellent high-temperature resistance and humidity resistance. Meanwhile, the structure can react with hydroxyl groups on the surface of materials, so that the sealant has excellent bonding properties on glass, ceramic and metal materials.

The invention relates to a curtain wall silicone adhesive shear performance non-sidesway testing device and method, and the device comprises a shear test piece which comprises two stone plates and a curtain wall silicone adhesive connected with the two stone plates; the four transverse steel plates are tightly attached to the upper sides and the lower sides of the two stone plates respectively; the square steel hoop is fixed on the outer side of the transverse steel plate; the first sleeve group comprises a first screw, a first sleeve and a second screw, and the first screw and the second screw are connected through the first sleeve; the first vertical guide rail and the second vertical guide rail each comprise a first vertical square steel plate and a second vertical square steel plate, and the lower portion of the first vertical square steel plate is slidably arranged in the second vertical square steel plate in a sleeved mode; the second sleeve group comprises a second screw, a second sleeve and a third screw, and the second screw and the third screw are connected through the second sleeve; compared with the prior art, the device has the advantages of ensuring the test precision and reliability, being convenient to operate, protecting the test piece, reducing the manufacturing cost and the like.

The invention discloses a high-whiteness, high-flowability and low-warpage polyester resin composition and a preparation method thereof, and belongs to the field of polymer composite materials. The composition comprises the following raw materials in parts by weight: 40-60 parts of PCT resin, 3-12 parts of second component polyester resin and 0.5-2 parts of hyperbranched dendritic polyester. Compared with a conventional PCT polyester composition, the composition disclosed by the invention has the advantages that the whiteness, the reflectivity, the mechanical property and the heat resistance are well maintained, and the flowing property is well improved, so that the composition can better meet the molding requirement of thousands of cavities in one mold during injection molding. After high-temperature baking, the buckling deformation phenomenon is obviously improved, and the deformation amount of the PCT reflection support under the high-temperature condition can be smaller, so that the bonding performance of the PCT reflection support and epoxy / silica gel sealant is better, the reliability of LED lamp beads is greatly improved, and the service life is prolonged.

The utility model relates to a special-shaped broken line glass curtain wall installation structure which comprises a plurality of pieces of glass, a stand column and cross beams, each piece of glass is fixed with the stand column through an aluminum alloy accessory in the vertical direction, each cross beam is fixed with the glass through an aluminum alloy auxiliary frame and a pressing block, the cross beams are fixed with the stand column through stainless steel plug pins, and the stand column is obliquely arranged. The combined adapter is connected with the steel tube, and the steel tube is welded with the embedded part; and the combined adapter is connected with the steel tube through the stainless steel pin shaft, so that the mounting angle of the combined adapter is convenient to adjust, the mounting angle of the upright post is adjusted, and the glass curtain wall in a continuous sawtooth fold line shape is formed. The aluminum alloy accessories are connected with the stand columns through heat insulation strips. A cavity in the corner of the stand column is filled with polyurethane foam for heat insulation and sealed by double silicone sealants. The glass curtain wall in a continuous sawtooth fold line shape is installed, the problem that the cold bridge effect of the fold angle portion is obvious is solved, and the overall energy-saving performance of the curtain wall is guaranteed.

The utility model discloses a floor type mounting structure of glass curtain wall relates to glass curtain wall technical field contains stainless steel groove, glass panel, switching steel sheet and concrete base, stainless steel groove passes through indoor terrace lengthways, and the top of stainless steel groove is flush with indoor terrace, switching steel sheet has two, and is located stainless steel groove's both sides respectively, and stainless steel groove is fixed and installed on concrete base through two switching steel sheets, stainless steel groove is U -shaped, and the lower end of glass panel is embedded in stainless steel groove, and the both sides and bottom of glass panel are all provided with flexible pad in stainless steel groove inner wall contact position, and the whole of the whole structure and stability are improved to the whole safety of the guarantee under the strong wind or earthquake load, and it is not easy to displace, and the whole safety is guaranteed, and the sealing of the connecting position is carried out to the silicone sealant, effectively avoid the generation of gap, improve the leakproofness, prevent rainwater seepage.

The present application belongs to the technical field of material testing and visual detection, and particularly relates to a visual observation system for high-temperature and high-pressure testing of organic silicon sealant, which comprises a high-pressure sealing cavity, a transparent observation window, a high-frame-rate industrial camera, a multi-spectrum coaxial light source system, an image acquisition and control module, and an image processing and analysis module; multi-scale space-time features are extracted through construction of an image pyramid and a three-dimensional convolutional neural network, a constitutive model of the organic silicon sealant is embedded into a light flow calculation framework to reconstruct a deformation field and a stress field in accordance with physical laws, a space-time graph convolutional network is used to identify rupture, flow and debonding failure modes, a physical information neural network is used to predict failure time and an extension trajectory, and finally, a safety working condition window is output by fusing temperature and pressure data. The present application realizes intelligent, quantitative and accurate observation of the dynamic failure process of the organic silicon sealant under high-temperature and high-pressure working conditions, and provides reliable data support for sealant selection and injection molding process optimization.

The present disclosure provides a one-component room temperature vulcanizable (RTV) silicone sealant composition comprising an alkoxy-terminated organopolysiloxane polymer (a) and a tin-based catalyst (d), and a process for preparing said one-component room temperature vulcanizable (RTV) silicone sealant composition comprising an alkoxy-terminated organopolysiloxane polymer (a) and a tin-based catalyst (d). The one-component room temperature vulcanizable (RTV) silicone sealant composition relies on a novel stabilizer combination (e) of (e)(i) one or more silazanes and one or more silanes (e)(ii) having at least one acetamide group, with the aim of providing a storage-stable one-component room temperature vulcanizable (RTV) silicone sealant composition.

The invention discloses a double-component room-temperature curing acetone-removing type organic silicon sealant and a preparation method thereof, and belongs to the technical field of polymer sealing materials, the sealant comprises a component A and a component B. The component A comprises alpha, omega dihydroxy polydimethylsiloxane, an acid-resistant reinforcing filler and a thixotropic filler, and the component B comprises a component A and a component B. The component A comprises alpha, omega dihydroxy polydimethylsiloxane, an acid-resistant reinforcing filler and a thixotropic filler. The component B comprises alkoxy-terminated polydimethylsiloxane, an acid-resistant reinforcing filler, a thixotropic filler, a heat-resistant filler, carbon black, a deacetonized cross-linking agent, a silane coupling agent and a catalyst. In particular, the invention also provides a preparation method of the alkoxy-terminated polydimethylsiloxane. The heat resistance of a deacetone silica gel system with excellent heat resistance is further improved and optimized, meanwhile, the requirements for rapid curing and attractive appearance of the microwave oven glue are met, the mixing volume ratio of the two components is 1: 1 during use, the requirement for equipment metering precision is low, and automatic equipment gluing of a gluing robot is facilitated.

This utility model relates to the field of electronic cigarette technology, specifically a novel in-vehicle electronic hookah. The novel in-vehicle electronic hookah includes a main bracket, inside which are a control component and an oil cup. One end of the control component is connected to a microphone component, and the oil cup contains a heating element. A water bottle is connected to the bottom of the main bracket. A smoke outlet is provided on the side wall of the main bracket. The main bracket contains a microphone air passage, a smoke outlet air passage, and a main air inlet air passage. The main air inlet air passage communicates with the microphone air passage and the heating element, and the smoke outlet air passage communicates with the smoke outlet and the water bottle. It also includes an air guide tube, one end of which is connected to the main air inlet air passage, and the other end extends into the water bottle. A first air intake silicone sealant is provided between the air guide tube and the main air inlet air passage. This utility model has excellent water and oil leakage prevention, is convenient for in-vehicle use, and offers high safety.

The utility model discloses a UHPC (Ultra High Performance Concrete) assembly type box culvert structure, which belongs to the technical field of box culvert structures and comprises a prefabricated box culvert, the prefabricated box culvert comprises a front-end box culvert, a tail-end box culvert and a plurality of groups of middle box culverts, a bottom plate is arranged at the bottom of the prefabricated box culvert, and a guide groove is formed in one end, close to the middle box culverts, of the front-end box culvert. A guide protrusion is arranged at the end, close to the middle box culvert, of the tail end box culvert, the periphery of the outer wall of the guide protrusion is coated with silicone sealant, and the guide protrusion and the guide groove are arranged at the two ends of the middle box culvert respectively. Connecting structures are arranged among the front-end box culvert, the middle box culvert and the tail-end box culvert, the two ends of each connecting structure penetrate through the corresponding guide protrusion and the corresponding guide groove correspondingly, a plurality of sets of U-shaped connecting pieces are arranged on the inner wall of the prefabricated box culvert, and the connecting structures penetrate through the U-shaped connecting pieces. According to the UHPC assembly type box culvert structure, the waterproof effect and the connecting strength are effectively improved, and high efficiency and convenient installation are achieved.

This invention discloses a modified polysilazane, a two-component silicone sealant, and a method for preparing the same. The modified polysilazane is prepared through a nucleophilic substitution reaction of dimethyldichlorosilane, vinyltrichlorosilane, and ethylenediamine. The two-component silicone sealant prepared using the modified polysilazane of this invention significantly improves its hardness under sealed conditions without adversely affecting its curing and performance. Furthermore, it requires a small amount and is highly practical. The two-component silicone sealant prepared using the modified polysilazane of this invention exhibits high hardness retention under sealed conditions, significantly slows down the reversion phenomenon, and maintains good mechanical properties and adhesion even after curing at 90°C under sealed conditions. It also demonstrates excellent resistance to reversion under fully sealed conditions.

The invention discloses a low-VOC (volatile organic compound) environment-friendly foaming PVC (polyvinyl chloride) profile and a preparation method, and relates to the technical field of building plastic profiles, the profile faces door and window joints in contact with silicone sealants (acetic acid type and oxime type) and polyurethane foaming agents, the profile adopts a three-layer structure: a surface layer is a sol-gel silica anti-infiltration layer; the near surface is a reaction-adsorption transition layer and contains beta-cyclodextrin grafted aminated silicon dioxide, zinc ion exchange zeolite and epoxy polyhedral oligomeric silsesquioxane; the foam core is a low-source foaming system and is matched with low-migration plasticizing lubrication; external acetic acid, oxime and tertiary amine are subjected to peak clipping and in-situ fixation in a epidermis-foam core transition zone through side feeding directional enrichment and plasma coating; under the conditions of ISO 16000-9 and VDA278, delta TVOC is less than or equal to 30 mu g / m, acetic acid, diacetylmonoxime and tertiary amine are reduced by more than or equal to 80%, more than or equal to 75% and more than or equal to 70%, and the adhesion and atomization performance is kept.

The utility model relates to the technical field, and discloses identification equipment for silicone sealant doped with white oil, which comprises a working table, a cover plate is rotatably connected onto the working table, an air inlet fan is mounted on the bottom side of the working table, an air exhaust fan is mounted on the rear side wall of the working table, a fixing ring is mounted on the rear side of the air exhaust fan, and the cover plate is rotatably connected onto the working table. An arc-shaped plate is arranged on the fixing ring, and a filter element is arranged in the arc-shaped plate. An air inlet fan is installed on the lower side table top of the infrared spectrum device and the thermal weight loss detection device installed on the workbench, and an air exhaust fan is installed on a baffle behind the infrared spectrum device and the thermal weight loss detection device. When a spectrum detection chamber and a thermal weight loss detection chamber in the infrared spectrum equipment and the thermal weight loss detection equipment are used for detecting a sample, an air inlet fan and an air exhaust fan are started to discharge harmful gas generated during detection, and the harmful gas can be filtered and purified through a filter element inserted into a fixing ring during discharge; and finally, the air is guided out and discharged through the flow guide pipe.

The invention provides a silicone sealant resistant to water and ultraviolet illumination and a preparation method of the silicone sealant. The silicone sealant is prepared from the following raw materials in parts by mass: 100 parts of alpha, omega-dihydroxy polydimethylsiloxane, 50-110 parts of nano calcium carbonate, 2-10 parts of silane intercalated montmorillonite, 2-8 parts of a cross-linking agent, 0.5-2 parts of a coupling agent, 0.5-2 parts of modified silane and 1-3 parts of a titanate catalyst. The silicone sealant resistant to water and ultraviolet light illumination is higher in strength, better in water and ultraviolet light illumination resistance and capable of better adapting to harsh natural environment conditions.

The present invention discloses a neutral silicone sealant and a preparation method thereof, and relates to the technical field of silicone sealant production, the neutral silicone sealant comprises the following raw materials by weight: 450 parts of hydroxyl-terminated polydimethylsiloxane, 400 parts of No.3 white oil, 110 parts of fumed silica, 60 parts of a ketoxime type cross-linking agent, 15 parts of an adhesion promoter, and 1.5 parts of a catalyst, -CH2CH2NHCH2CH2NH-,-CH2CH2NH2NH R1 is CH3 <-> or CH2CH3 <->; r2 is H or CH < 3->; and R2 is CH3 <-> or CH2CH3 <->. The curing problem of the ketoxime type neutral silicone sealant taking fumed silica as a main filler under low-temperature and low-humidity conditions is effectively solved, and the prepared silicone sealant has excellent adhesion to most of common substrates.

The invention discloses a method for preparing highly uniform silicone elastomer gel by accurately controlling in-situ cross-linking reaction, and relates to the technical field of preparation of high polymer materials and organic silicone gel. The invention relates to a silicone sealant, which comprises the following components: a dispersion medium: 60 wt%-90 wt% of polyorganosiloxane; a first reactant: 10 wt%-30 wt% of polyorganosiloxane containing at least two aliphatic unsaturated groups in the molecule; a second reactant: 0.5 wt%-10 wt% of polyorganosiloxane, the molecule of which at least contains two silicon-bonded hydrogen atoms (Si-H); the catalyst is a platinum-based catalyst and is used for promoting the hydrogen silicification reaction. The preparation method comprises the following steps: 1, mixing a first reactant and a second reactant in a dispersion medium with the viscosity of 2-100 cSt, and removing oxygen through nitrogen substitution; and 2, adding a platinum catalyst into the mixture obtained in the step 1, and carrying out an in-situ cross-linking reaction on the polysiloxane containing the aliphatic unsaturated group and the polysiloxane containing the silicon-bonded hydrogen atom so as to directly form particles.

The invention relates to the technical field of high polymer material manufacturing, and discloses a neutral silicone sealant and a preparation method thereof.The neutral silicone sealant is prepared by the following steps: firstly, mixing hydroxyl-terminated polydimethylsiloxane, methyl-terminated polydimethylsiloxane and calcium carbonate to prepare a base material; then a ketoxime type cross-linking agent, a catalyst and an adhesion promoter are sequentially added under the stirring and vacuum conditions, the adhesion promoter is prepared by stirring silane A and p-toluenesulfonic acid and dropwise adding silane B under the condition of 65 DEG C, and the silane A and the silane B represent methoxy silane or ethyoxyl silane with different substituent groups respectively. Regulation and control on indexes such as tensile modulus and elongation of the product can be realized by adjusting the composition of the adhesion promoter.

The invention discloses a building silicone sealant quality grading method. The building silicone sealant quality grading method comprises the following steps: S1, judging the type of a to-be-graded building silicone sealant; the types of the silicone sealants for the building comprise silicone building sealants, silicone structural sealants for the building and silicone structural sealants for hollow glass; s2, judging whether basic indexes of the to-be-graded building silicone sealant are met or not, if the basic indexes are met, determining that the to-be-graded building silicone sealant is qualified, carrying out the step S3, and if the to-be-graded building silicone sealant does not meet the basic indexes, determining that the to-be-graded building silicone sealant is unqualified, and outputting a result; and S3, testing the core indexes of the silicone sealant for the building to be graded, and sequentially dividing the core indexes into a standard level, a high-quality level and a flat-collar runner level from bottom to top according to the test results of the core indexes. Practical verification shows that the method can meet technical indexes of standard requirements and is an operable and practicable index.