405 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 discloses a low-shrinkage high-toughness sprayed concrete material as well as a preparation method and application thereof, and the low-shrinkage high-toughness sprayed concrete material is prepared from the following materials in parts by mass: 400 to 440 parts of cement, 50 to 70 parts of coal ash, 20 to 40 parts of silica fume, 170 to 190 parts of water, 850 to 880 parts of fine aggregate, 770 to 810 parts of coarse aggregate, 30 to 50 parts of accelerator and 3.2 to 6.0 parts of water reducing agent. Hybrid fibers: 30 to 50 parts of steel fibers and 0.9 to 2.7 parts of organic fibers. The low-shrinkage high-toughness sprayed concrete material provided by the invention can ensure high compressive strength and toughness, also has good durability and stability, effectively improves the construction quality of tunnel engineering, and has very excellent market prospects.

The embodiment of the invention provides a UV (ultraviolet) thermal dual-curing adhesive and a preparation method thereof. The UV thermal dual-curing adhesive comprises the following components in percentage by mass: 30-55% of a photocuring prepolymer; 5%-25% of an active diluent monomer; 1%-10% of a photoinitiator; 1%-20% of a thermal initiator; 10%-40% of a filler; 0.5%-5% of a coupling agent; 1%-10% of a thixotropic agent; 1%-10% of pigment; 2%-8% of an auxiliary agent; wherein the photocuring prepolymer comprises epoxy resin. According to the UV thermal dual-curing adhesive and the preparation method thereof provided by the embodiment of the invention, the dual-curing adhesive with low shrinkage and low thermal expansion coefficient is obtained by optimizing the structure of the photocuring prepolymer and matching the components, and the prepared adhesive can be rapidly cured under the irradiation of LED 365nm ultraviolet light, or can be thermally cured under the low-temperature condition of 80 DEG C, so that the UV thermal dual-curing adhesive can be widely applied to the field of ultraviolet curing. The product can resist high and low temperature cycle impact of-50 DEG C to 140 DEG C, and has a good application prospect.

The invention belongs to the technical field of building materials, and particularly discloses maintenance-free lightweight spraying ultra-high performance concrete as well as a preparation method and application of the maintenance-free lightweight spraying ultra-high performance concrete. Comprising 700 to 900 parts of Portland cement, 120 to 200 parts of silica fume, 100 to 200 parts of a layered mineral admixture, 30 to 70 parts of a gradient active expanding agent, 600 to 800 parts of modified lightweight aggregate, 0.5 to 3 parts of a rheology regulating agent, 40 to 80 parts of composite fiber, 7 to 10 parts of a water reducing agent and 170 to 200 parts of water. Based on the synergistic effect of all the components, on the basis that the light ultra-high performance concrete can be continuously sprayed, the spraying performance, the shrinkage performance and the interface bonding performance are further improved, the anti-cracking performance, the mechanical performance and the durability of the light ultra-high performance concrete are enhanced, formwork erecting, film covering maintenance and later maintenance are not needed in construction, and the construction period is shortened. And moreover, the coating has the advantages of small apparent density, strong interface adhesion, thick single-time spraying, high crack resistance, low shrinkage, ultrahigh strength, high durability and the like.

The invention discloses multi-scale toughened concrete and a preparation method thereof, and belongs to the technical field of high leakage, and the multi-scale toughened concrete comprises aluminoferrite cement, a low-shrinkage auxiliary cementing material, a water reducing agent, multi-scale composite fibers, a shrinkage compensation agent, fine aggregate, coarse aggregate and water. A traditional toughening mode is broken through, a physical-chemical composite connection interface is established through a magnetron sputtering metal gradient coating of crude fibers and a laser-induced dendritic crystal structure, a strain hysteresis effect is triggered under an impact load, impact energy is converted into interface phase change energy, and a high-efficiency energy dissipation channel is formed; an amino functional group and free radical cross-linked network is introduced into the fine fibers, and the fibers are endowed with microcosmic dynamic enhancement capability in combination with directional arrangement of the carbon nanotubes, so that the concrete forms cooperative interaction between macroscopic crack bridging and microcosmic crack inhibition, the crack resistance under complex stress is remarkably improved, and microcrack propagation is effectively inhibited.

The invention provides a phase change compensation low-thermal expansion coefficient resin formula and a preparation and use method of a composite prepreg tape of the phase change compensation low-thermal expansion coefficient resin. Tin micro-powder subjected to surface capsule coating treatment is added into a resin system, and heat absorption and low-temperature phase change volume expansion principles of the tin micro-powder are utilized; the resin system for the composite material has the characteristics of low heat release, low shrinkage and low thermal expansion coefficient. And by controlling the addition amount of the tin micro powder, the thermal expansion coefficient of the material is accurately regulated and controlled, generation and expansion of matrix microcracks are reduced or even inhibited, and the material performance is improved. Through microcapsule surface treatment and control of the particle size and shape of the tin micro powder, the interface compatibility problem can be solved, and resin toughening is realized. The method for producing the prepreg tape by the hot infiltration and cold demolding continuous drawing method is suitable for continuous and efficient production of the prepreg tape for high-performance fiber dry winding. The method has important economic, technical and social values, lays a foundation for scientific exploration and technical progress in the livelihood field, and improves the market competitiveness of products.

To provide a multi-layer biaxially oriented film that is resistant to tearing and the like even when stretched at high ratios, and that exhibits excellent heat resistance, particularly heat seal resistance (low shrinkage during heat sealing).SOLUTION: A multi-layer biaxially oriented film comprises an A layer and a B layer, wherein the A layer comprises: a resin composition comprising 75-99 mass% of a polymer satisfying (I) to (II); and 1-25 mass% of a copolymer satisfying (III) to (IV). (I): A content of a constituent unit derived from 4-methyl-1-pentene is 90.0-100 mol%, and a content of a constituent unit derived from a C3-20 α-olefin other than 4-methyl-1-pentene is 0.0 to 10.0 mol%. (II): A melting point is 200-250°C. (III): A content of a constituent unit derived from 4-methyl-1-pentene is 65.0-96.0 mol%, and a content of a constituent unit derived from a C8-20 α-olefin is 4.0 to 35.0 mol%. (IV): A melting point is not observed or is 100 to 199°C.SELECTED DRAWING: None

The invention discloses a flame-retardant PBT (Polybutylece Terephthalate) / brominated polycarbonate composition, which comprises the following components in parts by weight: 40-60 parts of PBT; 30 to 50 parts of brominated polycarbonate; 0.2 to 0.5 part of an anti-dripping agent; 10 to 15 parts of a glycidyl methacrylate grafted toughening agent; the viscosity average molecular weight of the brominated PC ranges from 13000 to 30000, and the molar ratio of the bisphenol A to the tetrabromobisphenol A is (55 to 40) to (45 to 60). The brominated polycarbonate with specific parameters is selected and cooperated with the glycidyl methacrylate grafted toughening agent, so that the flame retardance of V-0 can be realized, and the advantages of high low-temperature toughness (notch impact property tested at-30 DEG C) and low shrinkage after baking can also be realized.

The invention discloses a polypropylene composite material as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. The invention provides a polypropylene composite material. The polypropylene composite material comprises the following components in parts by weight: 40-80 parts of copolymerized PP (polypropylene), 5-25 parts of POE (polyolefin elastomer), 5-25 parts of polyisobutene and 10-30 parts of filler, the number-average molecular weight of the polyisobutene is greater than 600. The POE elastomer, the polyisobutene and the filler are introduced into the copolymerized PP, so that the polypropylene composite material with low sink mark characteristic and good mechanical property can be obtained.

The invention discloses epoxy resin for an optical fiber array and a preparation method thereof, and belongs to the technical field of epoxy resin preparation. The epoxy resin for the optical fiber array consists of the following components in parts by weight: 50-80 parts of epoxy resin, 5-30 parts of modified functional resin, 5-10 parts of a toughening agent, 1-5 parts of an auxiliary agent and 5-20 parts of a composite curing agent. The epoxy resin for the optical fiber array prepared by the method has excellent thermal stability and mechanical strength, also has low shrinkage and curing shrinkage stress, and avoids debonding of optical fibers and an adhesive layer.

The invention discloses a warp-resistant mineral reinforced PC / PBT alloy material with dimensional stability and a preparation method thereof, and relates to the technical field of polymer composite materials. The preparation method comprises the following steps: weighing polycarbonate, polybutylene terephthalate, ureido pyrimidone-polydimethylsiloxane, epoxy polyhedral oligomeric silsesquioxane, polyimide coated halloysite nanotubes, magnesium-aluminum hydrotalcite, perfluoroalkyl modified boron nitride nanosheets, liquid crystal polymer microfibers, modified PVA (Polyvinyl Alcohol) fibers and a silane coupling agent KH550 according to a ratio; the preparation method comprises the following steps: pre-mixing polycarbodiimide and a composite antioxidant to obtain a mixture, mixing, adding into a double-screw extruder, extruding and granulating, drying, carrying out injection molding, and standing at constant temperature and constant humidity to obtain the composite material. The invention has the significance of providing the PBT / PC alloy material with dimensional stability, warping resistance, low shrinkage rate, low hygroscopicity, creep resistance, impact resistance, arc resistance and chemical corrosion resistance for consumer-grade and industrial-grade underwater plastic parts.

The invention belongs to the field of intelligent materials, and discloses a nematic phase liquid crystal elastomer fiber and a method for optimizing the thermal shrinkage performance of the nematic phase liquid crystal elastomer fiber. According to the method, the mass ratio of a cross-linking agent pentaerythritol tetra (3-mercaptopropionate) (PETMP) to a chain extender 2, 2 '-[1, 2-ethanediyl bis (oxygen)] bis (ethanethiol) (EDDET) in an LCE spinning solution is accurately controlled through a wet spinning technology, and drafting and heat treatment processes are combined, so that the LCE fiber with adjustable and controllable heat shrinkage performance and mechanical performance is prepared. The invention aims to overcome the limitations of low response speed, low shrinkage rate, insufficient environmental stability and the like of the existing LCE fiber. The reversible thermal shrinkage rate of the fiber can reach up to 35%, the maximum shrinkage deformation can be completed within 2 seconds at the soonest at the temperature of 80 DEG C, and the maximum tensile strength can reach 170 MPa. And the catalyst has excellent oxidation stability (the mass retention rate is about 97%), and can maintain efficient thermal response in a water environment. And a new way is provided for development of high-performance intelligent materials.

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 belongs to the technical field of high-performance cement concrete, and particularly relates to low-shrinkage hybrid fiber concrete and a use method thereof. The low-shrinkage hybrid fiber concrete is prepared by mixing cement, fly ash, sand, gravel, steel fibers, synthetic fibers, water and a water reducing agent according to the mass ratio of (410 to 390): (70 to 100): (780 to 750): (900 to 1100): (95 to 65): 1.1: (150 to 160): (8.9 to 7.5). According to the invention, the dispersibility of the steel fibers and the synthetic fibers can be ensured, and the workability of concrete construction is ensured. Hybrid fibers of the concrete have high tensile strength, development of bridge deck concrete cracks is effectively delayed, the fracture resistance of the concrete is improved, the elastic modulus of the concrete is also improved, and therefore the axial tensile strength of the concrete is also obviously improved; meanwhile, the shrinkage performance of the concrete is effectively improved, the durability of the concrete is improved, the service life of the concrete is greatly prolonged, other stress structures of the bridge are effectively protected, and then the overall service life of the bridge is prolonged.

The invention discloses a low-shrinkage styrene thermoplastic elastomer and a preparation method thereof, and belongs to the technical field of thermoplastic elastomers. The low-shrinkage styrene thermoplastic elastomer is prepared from the following raw materials: 20 to 30 parts of styrene-butadiene block copolymer, 10 to 20 parts of polystyrene resin, 30 to 40 parts of softening operation oil, 30 to 60 parts of modified nano calcium carbonate, 1 to 2 parts of lubricating dispersant and 1 to 2 parts of antioxidant. The preparation method comprises the following steps: sequentially putting the styrene-butadiene block copolymer and the softening operation oil into a high-speed stirrer; then putting polystyrene resin, modified nano calcium carbonate, a lubricant and an antioxidant into a high-speed stirrer together to obtain a premix semi-finished product; and adding the premix semi-finished product into an extruder, and melting, extruding and granulating the premix through the extruder to obtain a finished product. The low-shrinkage styrene thermoplastic elastomer prepared by the invention has excellent flame retardant property.

The invention relates to the technical field of mine filling materials, and provides a low-shrinkage steel slag powder mine filling cementing material and a preparation method and application thereof.The cementing material is prepared from, by weight, 30-40 parts of steel slag powder, 50-60 parts of mineral powder, 8-15 parts of desulfurized gypsum and 0-5 parts of excitant, the excitant is superfine cement clinker, and the specific surface area is larger than or equal to 600 m < 2 > / kg; through a cascade reaction path of early excitation, expansion compensation and continuous enhancement among the components such as the steel slag powder, the mineral powder and the desulfurized gypsum, the filling cementing material which is high in solid waste mixing amount, low in shrinkage and appropriate in strength and has environmental protection benefits and engineering applicability is realized, pollution and carbon are reduced, cost is reduced and benefits are increased for tailing treatment, and the filling cementing material is suitable for being used as a filling cementing material. And the comprehensive utilization way of the tailings and the metallurgical solid waste is further expanded.

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 relates to a low-shrinkage UV and moisture dual-curing adhesive and a preparation method, and belongs to the field of electronic adhesives, the low-shrinkage UV and moisture dual-curing adhesive comprises the following components by weight: 10-20 parts of urethane acrylate resin, 10-20 parts of a silane-terminated modified urethane acrylate polymer, 5-20 parts of a reaction type acrylate monomer, 1-5 parts of a curing agent, 1-5 parts of a curing agent, and 1-5 parts of a curing agent. The photoinitiator, the moisture scavenger, the catalyst, the filler, the fumed silica and the additive are sequentially arranged from 1 part to 2 parts, 0.5-2 parts, 0.5-1 part, 0.5-1 part, 0.5-1 part, 0.5-2 parts, 0-2 parts and 0.5-1 part. The UV and moisture dual-curing adhesive prepared by the invention has the advantages of extremely low curing shrinkage, high hardness and bonding strength, low thermal expansion coefficient and good storage stability, and is suitable for sealing of consumer electronics or an alignment process in the lens industry.

The invention discloses a preparation process of composite cement based on activation of steel slag micro powder, belongs to the technical field of cement preparation, and aims to solve the technical problem that durability and stability of cement are difficult to further improve in the prior art. A composite cement preparation process based on steel slag micro powder activation comprises the following steps: adding final powder, a polycarboxylate superplasticizer, a retarder and a defoaming agent into a stirring kettle, and uniformly stirring to obtain composite cement; according to the invention, through synergistic combination of the composite activator, the activated steel slag micro powder and the porous silicon-aluminum-calcium sustained-release microspheres, a multi-layer reaction system with early-stage excitation, middle-stage reinforcement and long-term reinforcement effects is constructed; all the components are complementary in time and space to form a compact and continuous skeleton structure, the aperture is refined, the interface is stabilized, and the internal humidity and ion supply are maintained, so that the compressive strength and breaking strength of the concrete are remarkably improved, the shrinkage rate is reduced, and the impermeability and freeze-thaw resistance are improved.

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.

According to the low-shrinkage 3D printing zirconia ceramic and the preparation process thereof, photosensitive polyimide is selected, the photosensitive polyimide has an imine ring and a photosensitive group on a macromolecular chain and has the advantages of excellent photosensitivity, thermal stability, low volume shrinkage and the like, a photoinitiator does not need to be added into a product system, and the preparation process is simple. Curing can be directly completed under ultraviolet irradiation, and the problems of ceramic shrinkage, cracking and the like caused by volatilization or decomposition of a photoinitiator in a workpiece during degreasing are avoided; the ratio of the dispersing agent to the plasticizer in the product system is optimized, the viscosity of the slurry is reduced, the solid content is increased, the shrinkage rate after sintering is reduced, and the flowability and the printing precision of the slurry are ensured. Besides, by combining a flash sintering treatment process, grain growth coarsening is inhibited, a nanoscale compact structure is realized, and internal defects are reduced, so that the zirconia ceramic prepared by the method has the advantages of no defect, compact structure, smaller grain size (smaller than 1 mu m), excellent fracture toughness and higher relative density.

The present invention provides a multi-scale toughening and shrinkage-compensating C80 high-crack-resistant self-compacting concrete and a preparation method thereof. The present invention uses low-shrinkage and crack-resistant composite cement to compensate for the shrinkage of C80 concrete, avoiding the disadvantage that general expansive agents are difficult to function due to the low water-cement ratio design of ordinary C80 concrete, and solving the problem that C80 concrete is prone to shrinkage and cracking. The present invention uses multi-scale hybrid fibers to strengthen toughness and crack resistance, and uses high-strength fine steel fibers, multi-anchor steel fibers, and temperature-shrinkage-induced organic fibers to improve the toughness of C80 concrete and its crack resistance in the heating / cooling stages on a macro scale; and uses CaCO3 and CaSO4 composite whiskers and nano-silica-modified water-based polyurethane to form a uniform three-dimensional toughening network inside the cementitious slurry, thereby improving the tensile strength and toughness of C80 concrete on a micron scale. This allows C80 concrete to have the characteristics of low shrinkage, high toughness, and high crack resistance.

Disclosed in the present invention are a crystalline easy-to-recycle polyester heat-shrinkable film and a preparation method therefor. The film layer structure has an A / B / A three-layer structure; the layer A is made from the following raw materials: PETG, functional master batches and PET; and the layer B is made from the following raw materials: modified PET, PET, a nucleating agent, a chain extender and a foaming agent. A proper amount of the chain extender can increase the molecular weight, namely the melting point, and increase the crystallinity of the film together with the nucleating agent, which can synergistically improve the recycling property of the film. The foaming agent can improve the yield of the film and reduce the shrinkage force of the film, and the nucleating agent can promote the formation of microcrystals, thus inhibiting the overall haze increase of the film resulting from overlarge cells formed by foaming. During processing, the cell structure can be expanded due to a high draw ratio, and thus the film can have a higher heat shrinkage rate. In the present invention, an additive is introduced to improve the crystallinity and melting point of the film, and the resulting polyester heat-shrinkable film has the features of good recycling property, crystallizability, printability, shrinkability and low shrinkage force.

The invention belongs to the technical field of building materials, and particularly relates to a silicon-aluminum material as well as a preparation method and application thereof. The silicon-aluminum material comprises 10-65 parts by weight of red mud, 20-60 parts by weight of slag powder, 0-20 parts by weight of Portland cement clinker, 0.1-8 parts by weight of an exciting agent and 5-15 parts by weight of an expanding agent; wherein the expanding agent is prepared from the following components in percentage by mass: 0 to 60 weight percent of aluminum sulfate, 0 to 70 weight percent of carbide slag, 0 to 70 weight percent of tricalcium aluminate, 0 to 60 weight percent of calcium sulphoaluminate and 0 to 60 weight percent of gypsum, and the content of at least two components in the expanding agent is not 0. The silicon-aluminum material with specific components and content can give consideration to both high strength and low shrinkage rate, and when the silicon-aluminum material is used in cement mortar, the compactness of cement can be enhanced and cracking can be prevented, so that the material can be used for a long time.

The present invention relates to a polyester film with low shrinkage, good adhesion and wear resistance and a preparation method thereof. The polyester film comprises two surface layers and a core layer located between the two surface layers; the material of the surface layer is mainly composed of polybutylene terephthalate and a wear-resistant agent; the material of the core layer is mainly composed of a mixture of polycarbonate and polyethylene terephthalate-1,4-cyclohexanedimethanol. Preparation method: manufacturing surface layer pellets; manufacturing core layer pellets; extruding the melts separately and compounding them in a die head, and then subjecting them to shaping, cooling, pulling and annealing to obtain a polyester film. In the present invention, a core layer structure is introduced by a multi-layer co-extrusion method, and the film has wear-resistant and scratch-resistant functions after film formation, and no coating treatment is required; the core layer structure can achieve a low shrinkage rate and is easy to heat-seal; at the same time, the softening point of the introduced core layer is very low, so that the overall adhesion of the film is strong, and it has good adhesion performance to irregular concave and convex surfaces; the preparation method has a simple process and strong practicality.

The invention discloses a high-strength degradable polypropylene composite material as well as a preparation method and application of the high-strength degradable polypropylene composite material. Comprising the following components in percentage by weight: 40-60% of polypropylene, 5-15% of an elastomer, 3-10% of polycaprolactone, 10-25% of coffee grounds, 5-20% of polyhydroxyalkanoate, 3-12% of calcium carbonate, 0.3-1.5% of an antioxidant and 1-3% of a silane coupling agent. According to the composite material, by introducing coffee grounds and polyhydroxyalkanoate, a multifunctional composite system with high printability and controllable degradation is constructed, so that the technical bottleneck that the mechanical property and the processing fluidity of a biomass composite material are difficult to synergistically improve is broken through; and triple balance of high toughness, low shrinkage and good printing rheological property is realized, material guarantee is provided for 3D printing products with complex structures, and the 3D printing material is suitable for the fields of automobiles, environment-friendly packaging, 3D printing and the like.

The invention relates to the technical field of special toe cap materials, in particular to a glass fiber composite material for manufacturing a special toe cap and a preparation method of the glass fiber composite material. The invention relates to a glass fiber composite material for manufacturing a special toe cap. The glass fiber composite material is prepared by hot-pressing multiple layers of glass fiber prepreg cloth; the glass fiber prepreg is prepared from the following raw materials in percentage by mass: 60 to 65 percent of glass fiber gridding cloth, 24 to 28 percent of thermosetting resin composition, 3 to 4 percent of low-shrinkage resin, 0.15 to 2 percent of initiator, 0.2 to 0.3 percent of cross-linking agent, 4 to 6 percent of heat-resistant reinforced monomer, 0.4 to 0.6 percent of thickening agent, 0.25 to 0.35 percent of defoaming agent and 0.8 to 1.2 percent of release agent. The special safety toe cap prepared from the glass fiber composite material provided by the invention is light in weight, meets the lightweight design requirement of safety shoes, has excellent compressive strength and impact strength, and meets the requirements of European standard EN 22568, standard CSA and American standard ASTM.

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.