242 results about "Low shrinkage" patented technology

The invention discloses a transparent composition photoresist with low shrinkage and low vacuum deflation. Comprising the following raw materials in percentage by mass: 1-5% of modified polyhedral oligomeric silsesquioxane (POSS), 1-5% of an expanding monomer, 1-5% of modified acrylic resin, 1-5% of epoxy resin, 1-5% of a thiol cross-linking agent, 1-5% of an initiator, 0.1-3% of a curing accelerator, 0.2-0.5% of a flatting agent, 0.1-5% of a silane coupling agent, 0.01-0.2% of an antioxidant and 80-90% of an electronic-grade organic solvent. The invention also provides a preparation method of a cured coating prepared from the transparent composition photoresist with low shrinkage and low vacuum deflation. The product provided by the invention not only can maintain the properties of high hardness, high thermal stability, high planarization ability, high barrier property, low hygroscopicity, low dielectric constant and the like of the transparent composition photoresist coating, but also can enable the transparent composition photoresist coating to have excellent low shrinkage and low outgassing, thereby achieving the purposes of saving energy, reducing emission, reducing cost and improving efficiency; the low shrinkage of the transparent composition photoresist coating also widens the development of the material in the fields of other panel production processes such as OLED (Organic Light Emitting Diode) and the like.

The invention belongs to the technical field of textile material processing, and particularly discloses a preparation method of high-strength low-shrinkage composite yarn for spinning. A preparation method of a high-strength low-shrinkage composite yarn for spinning comprises the following steps: (1) respectively drying ultra-high molecular weight polyethylene and PET polyester, adding maleic anhydride grafted PE, a treated metal organic framework material, boron carbide nanoparticles, cellulose acetate and a silane coupling agent KH550, uniformly mixing, and carrying out melt extrusion to obtain nascent fibers; (2) performing first-stage pre-drafting, second-stage high-temperature tension field drafting and third-stage low-temperature relaxation treatment on the nascent fiber to obtain treated fiber; and (3) dipping the treated fiber in an ethanol solution containing nano SiO, and performing infrared radiation curing to obtain the high-strength low-shrinkage composite yarn for spinning. The composite yarn has good mechanical strength, wear resistance and low contractibility, and the yarn has wide application due to the high breaking strength.

This invention discloses a high-early-strength, low-shrinkage composite silicate cement and its preparation method, comprising: low-shrinkage silicate cement clinker, early-strength component, and gypsum component; the low-shrinkage silicate cement clinker is prepared from calcareous raw materials, siliceous-aluminous raw materials, ferrous raw materials, a first activator, and a mineralizer; its mineral composition includes: C3S 30-50 parts, C2S 20-40 parts, C3A 0.5-5 parts, and C4AF 10-25 parts; its particle size distribution characteristics are D10≥5μm, D90≤45μm, uniformity index of 1.2-1.6, and characteristic particle size of 25-30μm; the early-strength component is prepared from F-type fly ash or C-type fly ash, limestone, magnesium oxide, and a second activator; its mineral composition includes: C 20 A 13 M3S 350-65 parts, C2S 35-50 parts. The cement prepared by this invention not only has high early strength, but also has a small drying shrinkage rate.

The invention discloses a plastic-free low-shrinkage waterproof oil-proof barrier type modified acrylate emulsion and a preparation method thereof, the plastic-free low-shrinkage waterproof oil-proof barrier type modified acrylate emulsion comprises the following raw materials by mass: 3-12 parts of a nano dispersion, 13-42 parts of a hard monomer, 30-55 parts of a soft monomer, 3-10 parts of a silicon-containing monomer, 4-12 parts of a polyfunctional monomer, 0.1-3 parts of an initiator, and 2-13 parts of a reactive emulsifier; the modified acrylate emulsion is prepared from a nano dispersion, a hard monomer, a soft monomer, a silicon-containing monomer, a polyfunctional monomer, an initiator and a reactive emulsifier through soap-free emulsion polymerization. The plastic-free low-shrinkage waterproof oil-proof barrier emulsion is prepared through soap-free emulsion polymerization, the prepared emulsion is small in particle size, can form a dense film after being coated on the surface of paper, and has good barrier performance on water vapor, oil and the like; according to the plastic-free low-shrinkage waterproof oil-proof barrier emulsion, a polyfunctional structure, especially structures containing-COOH,-OH,-NH2,-NH-C (= O)-NH-and the like, is introduced into a molecular structure, so that the emulsion has good adhesion to paper-based fibers.

The invention discloses a low-shrinkage porous mullite ceramic photocuring additive manufacturing method which comprises the following steps: firstly, mixing a base material containing aluminum and silicon elements with a villiaumite catalytic phase to prepare composite ceramic slurry, preparing a ceramic green body through a photocuring additive forming process, and then preparing the low-shrinkage porous mullite ceramic through a temperature-controlled thermal degreasing and in-situ gas phase method sintering process. The porous mullite ceramic with low shrinkage rate is prepared. By using the villiaumite catalytic phase material, the printability and stability of the ceramic slurry are maintained, the sintering temperature in the heat treatment stage is reduced, the low-size shrinkage performance is obtained, and large-scale efficient additive preparation of the porous mullite ceramic structural part is easy to realize.

The invention discloses a resin alloy material as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. The resin alloy material comprises the following components: PET (Polyethylene Terephthalate) resin, PP (Polypropylene) resin and a compatilizer, the melting point of the PET resin is less than or equal to 200 DEG C; the cantilever beam notch impact strength of the PP resin is greater than or equal to 400J / m; the compatilizer comprises at least two of PP (Polypropylene) grafted maleic anhydride, POE (Polyolefin Elastomer) grafted maleic anhydride, POE grafted GMA (Glycidyl Methacrylate) and SEBS (Styrene-Ethylene-Butylene-Styrene) grafted maleic anhydride. According to the resin alloy material, through compounding of specific components, the mechanical strength of the resin alloy material is guaranteed, meanwhile, the shrinkage rate is reduced, the compatibility problem of PET and PP is solved, rigid-tough balance is achieved, a workpiece prepared from the obtained resin alloy material is not prone to being broken, the strength is high, and the resin alloy material is suitable for being used in the field of household appliance products and has wide application prospects. The method is especially suitable for preparing household appliance shells.

The application discloses a low-shrinkage polyester shrink film for labels, which adopts a three-layer co-extrusion structure and comprises an A-layer surface layer, a B-layer core layer and a C-layer bottom layer; the A-layer and the C-layer are arranged on the two sides of the B-layer and are both made of common PETG film; the B-layer is made of PETG shrink film functional master batch chips, hydroxyethyl cellulose and polysulfone; the total weight of the PETG shrink film functional master batch chips, the hydroxyethyl cellulose and the polysulfone is 100 wt%; the adding amount of the PETG shrink film functional master batch chips is 90 wt% to 95 wt%; the adding amount of the hydroxyethyl cellulose is 1 wt% to 3 wt%; and the rest is the polysulfone. The application further discloses a preparation method of the shrink film. After a small amount of hydroxyethyl cellulose and polysulfone are added into the PETG shrink film functional master batch of the core layer, the shrinkage of the shrink film can be obviously reduced, the shrinkage rate is relatively high, and the shrinkage temperature is relatively low; the improved shrink film is especially suitable for being used as a label with low shrinkage; and in post-processing and use, the improved shrink film is beneficial to improving the product yield.

The invention belongs to the technical field of building material preparation, and particularly relates to a large-volume ultra-high performance concrete block construction method which comprises the following steps: S1, block design and post-cast strip arrangement based on temperature control; s2, a formwork is installed; s3, binding reinforcing steel bars and reserving connecting ends; s4, arranging a thermal insulation layer; s5, concrete pouring; s6, intelligent temperature control maintenance; s7, low-shrinkage post-cast strip pouring is conducted; and S8, removing the template. According to the partitioning construction method, through scientific partitioning design, interface strengthening and intelligent temperature control, the temperature crack risk of the large-size UHPC is remarkably reduced, the structural integrity and durability are improved, and meanwhile the construction efficiency is optimized.

The invention relates to the technical field of forming dies for manufacturing building prefabricated parts, and particularly discloses a low-shrinkage wallboard prefabricating forming die, a production method and a low-shrinkage wall.The low-shrinkage wallboard prefabricating forming die comprises a frame shell and a base, and the base is provided with two face formworks and two side formworks; a pouring cavity with an upward opening is defined by the base, the two face formworks and the two side formworks, an opening is formed in the bottom side of the frame shell, a plurality of long-strip-shaped open holes are formed in the bottom side of the frame shell, and a plurality of strip-shaped elastic air bags are arranged in the frame shell. According to the production method of the low-shrinkage wallboard, the outer wallboard and the inner layer board are poured and formed in sequence, the shrinkage deformation of the outer wallboard is small, the heat preservation effect of the low-shrinkage wallboard is guaranteed, the cutting area of the outer wallboard in the wire arrangement process of the low-shrinkage wallboard is small, and the cracking risk of the repaired position after the outer wallboard is repaired is reduced.

The present invention provides a thermosetting resin composition for electromagnetic wave shielding, a bulk molding compound, and a molded product thereof, which are excellent in fluidity, injection molding property, compression molding property, and in which a molded product excellent in electromagnetic wave shielding property can be obtained. The thermosetting resin composition for electromagnetic wave shielding is characterized by containing a thermosetting resin (A) containing an unsaturated polyester resin (a1) and a vinyl ester resin (a2), a low shrinkage agent (B), a thickening agent (C) containing acrylic resin particles (c1) and magnesium oxide (c2), a thermally conductive filler (D), and a reinforcing material (E).

The invention relates to a double-resin interpenetrating network photo-thermal dual-curing optical fiber bonding and fixing adhesive which comprises the following components in parts by weight: 20-60 parts of epoxy resin, 10-30 parts of acrylate resin, 5-10 parts of a diluent, 0.5-3 parts of an auxiliary agent, 1-10 parts of a cationic photoinitiator, 1-10 parts of a free radical photoinitiator and 50-80 parts of filler. The shrinkage rate of the cured optical fiber bonding and fixing glue is not greater than 0.2%. According to the optical fiber bonding fixing glue provided by the invention, a low-shrinkage technical route for realizing co-growth of a double-resin interpenetrating network by regulating and controlling the curing reaction rate by virtue of photo-thermal dual-curing of the double-resin interpenetrating network and a filler in cooperation with the double-resin interpenetrating network.

This invention discloses a floor repair agent and its preparation method, belonging to the field of building materials technology. The repair agent comprises a modified resin component, a curing agent component, a modified composite functional filler, and composite additives. The modified resin is a composite system of silane coupling agent-modified epoxy resin and terminally hydroxylated polyurethane. The modified composite filler consists of modified nano-silica, passivated quartz sand, and hydroxylated recycled polyurethane rigid foam powder. The composite additives include a compound toughening agent and composite modified polypropylene fibers. During preparation, each component undergoes targeted modification pretreatment, followed by temperature-controlled stirring and step-by-step mixing to obtain the finished product. This invention solves the problems of poor resin compatibility, weak filler bonding force, and easy cracking and debonding in existing repair agents. The product has high bonding strength, low shrinkage, wear resistance, and impact resistance. It can be used stably in environments ranging from -30℃ to 80℃, is environmentally friendly and odorless, and is easy to apply. It combines performance and cost advantages, and is suitable for long-term repair of various floor types and heavy-duty, high- and low-temperature conditions.

The application discloses a kind of resin for flame-retardant optical fiber reinforcing core and preparation method thereof, it is related to epoxy resin technical field.The resin for flame-retardant optical fiber reinforcing core includes the following mass parts components: 80~90 parts bisphenol A epoxy resin, 2~4 parts trimethylolpropane triglycidyl ether, 6~8 parts 4,4'-diphenyl bisphenol diglycidyl ether, 5~7 parts amino boron nitride, 15~18 parts toughening curing agent, 25~35 parts acid anhydride curing agent, 0.2~1 parts accelerator.On the basis of guaranteeing low shrinkage, the mechanical properties, flame-retardant performance of resin for flame-retardant optical fiber reinforcing core are effectively improved.

The utility model discloses a weighing and packing device for low-shrinkage cable insulation materials, which comprises a support frame, a weighing hopper and a storage hopper are sequentially arranged in the support frame from top to bottom, and the weighing hopper is arranged in the storage hopper; the storage hopper is provided with a discharging pipeline, a barrier plate is arranged at an outlet of the discharging pipeline, a disturbance spring is arranged on the barrier plate and connected to the inner wall of the discharging pipeline and the barrier plate, a driving assembly is arranged on the storage hopper and connected with the barrier plate, and the disturbance spring is connected to the inner wall of the discharging pipeline and the barrier plate. The blocking plate is lifted at the outlet of the discharging pipeline for blocking, and the disturbance spring is driven to shake in the discharging pipeline to accelerate discharging; the utility model has the beneficial effects that the baffle plate is controlled to lift at the outlet of the discharge pipeline through the driving component, and the disturbance spring is synchronously triggered to shake in the movement process of the baffle plate by combining the linkage design of the disturbance spring, so as to form continuous disturbance on materials in the pipeline.

The invention discloses a method for multi-dimensional uniform deformation of a micro-nano structure, belongs to the technical field of advanced material processing and manufacturing, and solves the problems of product structure distortion and out-of-control precision of a nano-scale structure caused by low shrinkage rate and non-uniform sintering process densification in the prior art. The method comprises the following steps: uniformly mixing matrix powder, an activator and a morphology stabilizer to obtain a mixture, and carrying out micro-injection molding on the mixture to obtain a pre-amplified micro-nano structure; performing segmented degreasing on the pre-amplified micro-nano structure, performing gradient sintering, and performing hot isostatic pressing treatment to obtain a multi-dimensional uniformly-deformed micro-nano structure; wherein the matrix powder comprises metal powder and / or ceramic powder, the activating agent is eutectic alloy with the melting point smaller than or equal to 200 DEG C, and the morphology stabilizing agent is rare earth metal oxide and / or transition metal oxide. The invention has the advantages of high shrinkage rate, uniform shrinkage and high mechanical strength.

The invention relates to a dry spinning preparation method of low-shrinkage polyamide fibers, and belongs to the technical field of chemical fibers. Nano aluminum oxide and an enhanced modifier are introduced into a fiber raw material for synergistic modification, the fiber is endowed with excellent low shrinkage, the enhanced modifier can be anchored on the surface of a filler through the strong chelation of a molecular center, and meanwhile, polyether long chains on the periphery of the enhanced modifier and a polyamide matrix form dynamic hydrogen bond entanglement, so that the fiber has excellent low shrinkage. And a rigid core-flexible interface-polymer entanglement net structure is constructed. The structure can effectively limit slippage and rearrangement of a polyamide molecular chain on the premise that the spinning state is not remarkably increased, so that the breaking strength and toughness of the fiber are synergistically improved while the boiling water shrinkage rate and the dry heat shrinkage rate of the fiber are remarkably reduced, and the problems of spinning difficulty and obdurability imbalance caused by traditional filler modification are comprehensively solved.

This invention discloses a high-elasticity modulus concrete and its preparation method. The high-elasticity modulus concrete comprises, by weight, cementitious materials: volcanic rock: river sand: water: water-reducing agent in a ratio of 575:990:755:115:(20-22). The cementitious materials, by weight, comprise: cement: fly ash: silica fume in a ratio of (375-435):85:55. This invention utilizes volcanic rock as coarse aggregate to construct a rigid skeleton, and incorporates cementitious materials to leverage their synergistic physical filling and volcanic ash effect, optimizing the matrix density and interfacial transition zone structure. Combined with ultrasonic-assisted mixing, it achieves uniform dispersion and efficient hydration of fine materials. This concrete exhibits high compressive strength and high elastic modulus, demonstrates low shrinkage and creep characteristics, good volume stability, and excellent durability. It is suitable for high-rise and super high-rise buildings and large-span structural engineering, significantly improving structural stiffness, saving building materials, and increasing usable space utilization.

The present application relates to the field of heat shrinkable film, in particular to a low shrinkage force PETG composite heat shrinkable film. The PETG composite heat shrinkable film comprises an upper surface layer, an inner core layer and a lower surface layer arranged in turn from top to bottom. The upper surface layer and the lower surface layer are both PETG films, and the inner core layer is a PETG / PBAT composite film. The PETG composite shrinkable film designed by the present application can maintain a low shrinkage stress while ensuring strength, and its thermal stability is enhanced, so that it can shrink more uniformly during interface shrinkage, thereby avoiding the phenomenon of local deformation or poor arc-shaped shrinkage.

The invention discloses a low-temperature thermoplastic composition, a low-temperature thermoplastic material prepared from the low-temperature thermoplastic composition and application of the low-temperature thermoplastic material, and relates to the technical field of medical materials. The low-temperature thermoplastic composition is mainly prepared from the following components: thermoplastic resin, reinforcing filler and an irradiation crosslinking auxiliary agent, the thermoplastic resin contains polyurethane, and every 100 parts of the low-temperature thermoplastic composition at least contains 27 parts of first polyurethane of which the flow starting temperature is 50-95 DEG C and the opening time is more than 6 minutes. According to the low-temperature thermoplastic composition, the polyurethane is selected and the reinforcing filler is matched, so that the low-temperature thermoplastic material has lower contractility and longer operation time, and the low-temperature thermoplastic material prepared from the low-temperature thermoplastic composition can be used for fixing parts with higher requirements on the operation time.

The invention discloses a low-shrinkage scratch-resistant high-brightness black polypropylene composition and a preparation method thereof. The low-shrinkage scratch-resistant high-brightness black polypropylene composition is prepared from the following raw materials: 40-70 parts of homo-polypropylene resin, 0-20 parts of crystal whiskers, 0-20 parts of wollastonite, 5-15 parts of a toughening agent, 1-5 parts of a coupling agent, 1-5 parts of a compatilizer, 0-3 parts of a scratch aid, 0-0.5 part of a nucleating agent, 0-5 parts of toner and 1-3 parts of other aids. The main filler is wollastonite subjected to two-stage modification, the wollastonite has excellent compatibility with a polypropylene material, compared with a traditional mineral filling system, the glossiness of the composite material is remarkably improved, the comprehensive mechanical property is excellent, and the performance of the composite material is further enhanced and the shrinkage rate of the composite material is reduced through the auxiliary filling whiskers. The overall performance of the high-brightness black polypropylene composite material is remarkably improved, and the high-brightness black polypropylene composite material has very important significance in widening the application range of the polypropylene material in the field of automobiles. The high-brightness black ASA / PMMA material is simple in production process and relatively low in formula cost, and has a great application prospect in replacing part of the high-brightness black ASA / PMMA material in some parts of automobile interior and exterior decorations.

The invention discloses low-shrinkage ultra-high performance concrete as well as a preparation method and application thereof, and belongs to the technical field of building materials. The low-shrinkage ultra-high performance concrete is prepared from the following raw materials in parts by weight: 500 to 600 parts of cement, 1000 to 1500 parts of magnesium-titanium slag sand, 150 to 200 parts of fly ash, 150 to 200 parts of silica fume, 100 to 150 parts of rice hull ash, 150 to 180 parts of steel fiber, 20 to 30 parts of a water reducing agent and 150 to 180 parts of water. The invention further discloses a preparation method and application of the low-shrinkage ultra-high performance concrete. The low-shrinkage ultra-high performance concrete prepared by the invention can better solve the problem of poor long-term durability of the concrete caused by high shrinkage characteristic of the existing ultra-high performance concrete.

The invention discloses an indoor wall construction method based on novel gypsum mortar, a gypsum bottoming plastering-free structure and a preparation method. The construction method comprises the following steps that S1, a base layer is pretreated; step S2, mortar preparation; s3, layered construction is conducted; and S4, carrying out anti-cracking enhancement treatment. The novel gypsum mortar can be free of plastering without a high-precision base layer, and has the characteristics of high strength and low shrinkage.

This invention discloses a method for preparing superhydrophobic aerogels under ambient pressure based on framework regulation and its application. The invention involves a multi-component composite of carboxymethyl cellulose, aramid fiber, carboxylated nitrile rubber, melamine-formaldehyde resin, modified montmorillonite, hydrophobic silica, and an organosilicon waterproofing agent. A vertical pore template is constructed through directional freezing, followed by gradient solvent displacement and ambient pressure drying to finally solidify the superhydrophobic-superoleophilic aerogel. This invention successfully overcomes the core challenge of structural collapse caused by capillary forces during ambient pressure drying through the synergistic enhancement of the organic-inorganic hybrid framework and surface energy regulation, achieving a balance between low shrinkage, high porosity, and stable superwetting properties. The aerogel of this invention possesses excellent mechanical strength and elasticity, and its functionality can be expanded by introducing photothermal fillers. The process equipment is simple and energy-efficient, providing an economical and feasible technical path for the large-scale preparation of high-performance superhydrophobic aerogels.

This invention discloses a low-temperature thermoplastic composition and the low-temperature thermoplastic material made therefrom, as well as its applications, relating to the field of medical materials technology. The low-temperature thermoplastic composition mainly comprises the following components: thermoplastic resin, reinforcing filler, and radiation crosslinking agent; the thermoplastic resin includes polyurethane, and each 100 parts of the low-temperature thermoplastic composition contains at least 27 parts of a first polyurethane with a flow start temperature of 50-95°C and an open time of at least 6 minutes. Through the selection of polyurethane and the combination of reinforcing filler, the low-temperature thermoplastic composition enables the low-temperature thermoplastic material to have lower shrinkage and a longer operating time, allowing the low-temperature thermoplastic material prepared from the composition to be used for fixation of parts with higher operating time requirements.

The invention discloses a preparation method of regenerated ultra-low shrinkage black polyester staple fibers, and relates to the technical field of polymer waste recovery and regeneration, the preparation method comprises the steps of raw material mixing, drying treatment, spinning forming, post-treatment section, curling and cutting and finished product treatment, and when the shrinkage rate of the regenerated polyester staple fibers is controlled, the shrinkage rate of the regenerated polyester staple fibers is controlled by establishing a gradient temperature regulation and control program. Differentiated heat setting paths are set according to different regenerated raw material components, so that the accuracy of eliminating the internal stress of the fiber is ensured, the problem of abnormal shrinkage caused by local thermal stress concentration is avoided, the stability of the ultralow shrinkage performance of the fiber is ensured, and the size reliability of a product is improved; when fiber in-situ coloring and structure strengthening are carried out, synchronous achievement of color uniformity and ultra-low shrinkage characteristics is guaranteed by synchronously tracking the dispersion state of color master batches and crystallization dynamic evolution.

The invention relates to a Nickel based superalloy and a component of it comprising (in wt%) 12,0% to 15,0% Chromium (Cr), 1,0% to 2,0% Molybdenum (Mo), 3,0% to 12,0% Tungsten (W), 1,2% to 2,0% Aluminum (Al), 1,2% to 2,0% Titanium (Ti) 5 1,2% to 2,0% Niobium (Nb), 0,03% to 0,13% Carbon (C), 0,005 to 0,025% Boron (B) 0,008% to 0,1% Zirconium (Zr), optionally: Silicon up to 0,2% and / or Manganese (Mn) up to 1,0%.

This invention belongs to the field of electronic materials technology, specifically relating to a cofferdam filler adhesive and its preparation method. It includes two components, A and B: Component A is a thixotropic cofferdam adhesive, comprising epoxy resin, a latent curing agent, a composite thixotropic agent, a composite inorganic filler, an interface compatibilizer, a coupling agent, and a dispersant; Component B is a flowable filler adhesive, comprising epoxy resin, an anhydride curing agent, a curing accelerator, an inorganic filler, a coupling agent, a wetting and dispersing agent, a stress absorber, and a surface tension modifier. The prepared cofferdam adhesive exhibits high viscosity, high thixotropy, high Tg, and low shrinkage, while the filler adhesive has low viscosity, low thixotropy, good flowability, low shrinkage, and high Tg. The two products have similar coefficients of thermal expansion and good compatibility.

The present invention provides novel tools and methods for improving load transfer in dental isotropic particulate reinforced composites. By creating textured composite interfaces during chairside composite lamination or layering, the load transfer in hand sculpted and 3D printed composites can be significantly enhanced without the need for embedding fibers or reinforcing elements. This leads to improved stress transfer, load-bearing capacity, and reduced shrinkage stress in dental composites. The invention also has applications in structural composite materials technology, aerospace engineering, and resin SLA 3D printing, allowing the mechanical properties and response of the composite to be easily enhanced or tailored.

The invention discloses a method for manufacturing a main surface of a shipborne special-shaped antenna, and belongs to the technical field of antenna manufacturing. According to the method, aiming at the problem that the main surface of the shipborne long-strip elliptical antenna is easy to deform, molded surface deviation control is realized through mold structure optimization, product structure design and process parameter control, a mold adopts a cast iron material, an upper and lower mold pressing structure and a multi-degree-of-freedom adjusting device, and an I-shaped beam and a net-shaped framework are additionally arranged in the product; a low-shrinkage epoxy carbon fiber composite material is selected and matched with a specific prepreg laying and curing process. The profile deviation caused by thermal expansion of the mold can be reduced by 10%-20%, the rigidity and the stability of a product are remarkably improved, the mean square error of profile profile deviation is controlled within 0.15 mm, the high-precision use requirement of shipborne and vehicle-mounted radar radomes is met, and good practicability and popularization value are achieved.

The application discloses a kind of dirt-resistant sheet molding compound and preparation method thereof, it is related to molding compound technical field.The molding compound mainly includes: 80~120 parts resin matrix, 30~50 parts low shrinkage additive, 1~2 parts initiator, 0.5~1 parts polymerization inhibitor, 5~10 parts crosslinking agent, 5~10 parts release agent, 300~400 parts inorganic filler, 2~5 parts silane coupling agent, 5~10 parts color paste, 2~5 parts thickening agent, 100~450 parts alkali-free glass fiber;Inorganic filler uses different particle sizes of aluminium hydroxide, including: 1-3 μm, 3-5 μm, 6-8 μm in multiple combination grading, improve the density of molding compound product;Mixed resin paste is added to alkali-free glass fiber to be rolled up and compacted, sheet structure is obtained, and sheet molding compound is finally prepared by winding thickening;The sheet molding compound prepared in the application is tested by soy sauce, red wine, ink, salad oil stains, and has good dirt resistance.