27 results about "Nepheline" patented technology

This invention provides a method for activating and extracting potassium from potassium feldspar, the method comprising the following steps: (1) ball milling potassium feldspar raw material to obtain pre-activated potassium feldspar powder; the pre-activated potassium feldspar powder is in a near-amorphous state; (2) mixing the pre-activated potassium feldspar powder with an alkaline solution and performing a stirring transformation reaction, followed by a first solid-liquid separation to obtain a transformed solid product; the Si / K molar ratio of the main phase of the transformed solid product does not exceed 2.5; the phase composition of the transformed solid product includes garnet and / or nepheline; (3) mixing the transformed solid product with an acid solution and performing a second solid-liquid separation to obtain a potassium-rich leachate. This invention utilizes a stirring transformation reaction with a mixed alkaline solution to restructure potassium feldspar minerals, increasing the reactivity of potassium, and then dissolving potassium with acid to ultimately obtain a potassium-rich leachate, which is beneficial for further recycling.

The invention relates to the field of architectural ceramics, and discloses light-transmitting powder, a gradually-changed light-transmitting ceramic tile and a preparation method of the gradually-changed light-transmitting ceramic tile. The light-transmitting powder comprises the following raw materials in parts by weight: 50-70 parts of nepheline syenite, 10-15 parts of superfine quartz, 10-20 parts of kaolin, 3-8 parts of barium carbonate, 5-10 parts of wollastonite, 3-5 parts of yttrium aluminum garnet and 2-4 parts of magnesium aluminate spinel. By adopting the formula, the light-transmitting green body which is high in light transmittance, stable in light transmittance and uniform in light transmittance can be prepared by compounding multiple components, and a good foundation is provided for preparing a ceramic tile with full-transparent jade texture.

The present invention relates to a coating composition that provides high resistance to dirt, friction and polishing, due to the presence of mineral fillers and polymeric dispersions that promote resistance to polishing and meet wet abrasion resistance, said composition comprising: (a) at least one mineral filler selected from nepheline syenite, natural diatomite or a mixture thereof; (b) at least one silica-based matting agent; (c) at least one non-ionic aqueous emulsion selected from paraffin wax and high-density polyethylene wax or a mixture thereof; and (d) at least one additional component selected from the group consisting of solvent, dispersing agent, binding polymer and mixtures thereof. The present invention also relates to the use of the composition for the preparation of a washable matte acrylic paint product and matte acrylic paints containing the composition as claimed herein.

The invention discloses a fluxing agent for replacing fluorite in iron and steel smelting and a manufacturing method thereof, and belongs to the field of iron and steel smelting. The fluxing agent for replacing fluorite is prepared by taking nepheline syenite containing various silicate minerals as a main material, crushing, adding a mixture taking bentonite and starch as a binder, adding water, uniformly mixing, then pressing into pellets with the diameter of 30-40mm by a machine, and airing and drying for use. Wherein the binder accounts for 3-5% by weight, is the same as fluorite, has the effects of reducing the melting point and apparent viscosity of the slag, improving the fluidity of the slag and reducing the iron loss of the slag, and can increase the alkalinity of molten steel and improve the quality of the molten steel. The ingredients overcome the defects of fluorite in iron and steel smelting, corrosion to a furnace lining of a melting furnace can be reduced, the health of workers is not harmed, pollution of slag to the environment can be reduced, and the post-treatment process of the slag is simplified, so that the treatment cost of the slag is reduced.

The invention discloses a lead-free environment-friendly white oily cracked ceramic glaze and an application method thereof. The ceramic glaze is prepared from the following raw materials in percentage by weight: 28 to 35 weight percent of albite, 5 to 8 weight percent of Suzhou kaolin, 9 to 19 weight percent of quartz, 4 to 10 weight percent of calcite, 5 to 10 weight percent of barium carbonate, 18 to 25 weight percent of talc, 0.5 to 16 weight percent of sodium carbonate, 1.4 to 2 weight percent of ZnO and 2 to 6 weight percent of nepheline syenite. The application method comprises the following steps: step 1, preparing ceramic glaze powder; 2, mixing and ball-milling are carried out; step 3, sieving the glaze slip with meshes, and aging to obtain glaze; and 4, applying the glaze to the surface of the green body, drying, and sintering in a reducing atmosphere to obtain a ceramic glaze decoration product. The ceramic glaze has the advantages of high whiteness, high hardness and unique decorative effect, the preparation process is simple, the energy consumption is lower, and the product does not contain heavy metals such as lead and meets the green and environment-friendly requirements.

This invention discloses a frit, comprising, by weight, the following raw materials: 8-10 parts albite, 5-10 parts strontium carbonate, 5-15 parts alumina, 1-6 parts corundum, 3-6 parts borax, 10-15 parts diopside, 5-10 parts clay, 10-15 parts fluorite, 15-20 parts quartz, 4-10 parts dolomite, and 1-2 parts nepheline. This frit possesses advantages such as strong water retention and good screen-removal properties. Glazes prepared using this frit can solve problems encountered in the production of marble ceramic tiles using large-format screen printing, including easy adhesion to the screen, easy detachment, poor water retention, uneven printing, and pattern layer adhesion caused by large screen size and slow screen lifting.

The invention provides a method for recovering nepheline in lithium feldspar tailings and a molecular sieve preparation method and equipment, and relates to the field of tailings recovery. The method for recovering nepheline in the lithium feldspar tailings comprises the following steps: S11, grinding, screening and calcining the lithium feldspar tailings in sequence; and S12, slurrying the calcined material, dispersing the material through an ultrasonic separation system, then adding a flocculating agent, adding the mixed slurry into a flexible recovery system, adding a flotation reagent, agglomerating a hydrophilic material, and settling and separating a hydrophobic material. According to the method for recycling the nepheline in the lithium feldspar tailings and the molecular sieve preparation method, the nepheline in the lithium feldspar tailings is recycled through a soft natural stripping process, the extraction rate of the nepheline is increased, then the nepheline is further purified and treated, the nepheline forms molecular sieve crystal mush, and molecular sieve particles are obtained through the following steps of roasting and curing and the like. Therefore, full utilization of the lithium tailings is realized, and waste utilization is realized.

This invention discloses a dark-colored velvet-textured ceramic slab, a base glaze, and its preparation method. The dark-colored velvet-textured base glaze is prepared by ball milling according to the following mass ratio of material: water: carboxymethyl cellulose: sodium tripolyphosphate: 100:36:(0.1-0.2):(0.3-0.5). The material of the velvet-textured base glaze is prepared from the following components in parts by weight: 3-8 parts wollastonite, 5-10 parts dolomite, 10-15 parts strontium carbonate, 2-5 parts calcined talc, 30-40 parts potassium feldspar, 5-10 parts nepheline, 5-10 parts calcined kaolin, 5-15 parts quartz, 1-5 parts white corundum, 3-8 parts calcined zinc oxide, and 10-15 parts matte transparent frit. The matte transparent frit includes the following components in the following mass percentage: SiO2. The composition is 55-60%, Al₂O₃ 12-15%, K₂O 2-3%, Na₂O 3-4%, CaO 20-25%, and the calcination vector of the matte transparent frit is 1%-5%. This solution improves the light transmittance of the glaze layer, enhances the transparency, and maintains a uniform and dispersed surface gloss without crystallization, resulting in a glaze surface with a velvety soft feel.

The application provides a microcrystalline glass, wherein a crystal phase in the microcrystalline glass comprises a sodium-containing nepheline phase, a forsterite crystal phase and a TiO2 crystal phase, wherein the sodium-containing nepheline phase comprises one or more of sodium nepheline and a silica solid solution thereof, a sodium-potassium solid solution nepheline and a silica solid solution thereof; and the TiO2 crystal phase comprises at least one of an anatase phase and a rutile phase. The microcrystalline glass containing the above crystal phase has high light transmittance, can be efficiently ion exchanged to obtain a strengthened microcrystalline glass containing a hexagonal potassium nepheline crystal phase on the surface, and has high hardness and good drop resistance, and can meet the application requirements of large-size, ultrathin terminal glass cover plates and the like. The application also provides a strengthened microcrystalline glass obtained by strengthening the microcrystalline glass, and a terminal adopting the strengthened microcrystalline glass.

The application relates to the technical field of building ceramics, and discloses a radiation refrigeration ceramic tile and a preparation method thereof. The radiation refrigeration ceramic tile comprises a bottom glaze layer and a reflective heat insulation surface glaze layer. Raw materials of the bottom glaze layer comprise kaolin, calcined kaolin, porous alumina powder, quartz, calcined talc, nepheline, potassium feldspar, sodium feldspar, trivalent europium ion doped magnesium aluminate spinel powder and zirconium silicate. The purpose of the bottom glaze layer formula design is to design a bottom glaze layer with an expansion coefficient close to that of a conventional qualified ceramic tile, and meanwhile, porous alumina and trivalent europium ion doped magnesium aluminate spinel powder are introduced, so that the expansion coefficient of the bottom glaze layer is consistent with that of a conventional produced body and the reflective heat insulation surface glaze layer, the structure of the porous alumina is not damaged, and the problem that the reflectivity and emissivity of the glaze are difficult to effectively improve when the expansion coefficients of the bottom glaze layer, the body and the surface glaze layer are inconsistent is solved. + The trivalent europium ion doped magnesium aluminate spinel powder ensures that the expansion coefficient of the bottom glaze layer is consistent with that of the conventional produced body and the reflective heat insulation surface glaze layer, the structure of the porous alumina is not damaged, and the problem that the reflectivity and emissivity of the glaze are difficult to effectively improve when the expansion coefficients of the bottom glaze layer, the body and the surface glaze layer are inconsistent is solved.

The present application relates to a method for separating and purifying desilication products from red mud, drying the red mud, coarsely grinding it into powder, passing it through a 325 mesh vibrating screen, and performing multi-stage gravity separation on the undersize product until a gravity concentrate with a density less than 2.2 g / cm 3 is obtained, removing impurities from the obtained gravity concentrate with dilute alkali, and then performing solid-liquid separation, collecting the solid precipitate, and performing washing and drying treatment on the solid precipitate to obtain a desilication product purification product. The present application separates and purifies desilication products from red mud using a simple method without the need for high temperature and high pressure, etc., thereby maximizing the preservation of the original appearance and physicochemical properties of sodalite and calcium nepheline desilication products, which can be used as original samples for mineralogical analysis, elemental composition analysis, and microscopic morphology analysis of desilication products contained in red mud. The desilication products separated and purified by the present application have high purity, low investment and operating costs, and can be applied on a large scale in industry.

The application discloses a method for high-temperature and high-pressure collaborative treatment of red mud, coal or coal gangue, and belongs to the field of resource utilization of red mud, coal or coal gangue. The method comprises the following steps: mixing red mud, coal or coal gangue and water, and then placing the mixture into a high-temperature and high-pressure device; introducing an oxygen-containing gas or adding an oxidant; under the high-temperature and high-pressure conditions, mineral decomposition and reconstruction of the red mud and the coal or coal gangue occur, acidic substances produced by oxidation of sulfide minerals and carbon-based minerals in the coal or coal gangue and alkaline substances in the red mud are subjected to neutralization reaction; and after desalination of reaction products of the red mud and the coal or coal gangue, the reaction products are used as ecological matrix soil. The method disclosed by the application accelerates decomposition of alkaline minerals such as nepheline in the red mud and release of alkali under high-temperature and high-pressure conditions, and accelerates oxidation of carbon-based minerals and sulfide minerals in the coal or coal gangue and transformation of humus and humic acid, neutralizes alkaline substances and acidic substances produced in the reaction, realizes rapid dealkalization of the red mud, controls the degree of oxidation of the carbon-based minerals, and improves the content of organic matter in the reaction products, so that full resource utilization and ecological utilization of the red mud, the coal or the coal gangue are realized.

This invention belongs to the field of architectural ceramics, specifically disclosing a ceramic tile with a simulated dry granular surface effect and its preparation method. The ceramic tile comprises, from bottom to top, a body, a glaze layer, a colored ink layer, a matte micro-engraved ink layer, and a protective glaze layer. The raw materials for preparing the glaze layer, by weight, include: 10-15 parts potassium feldspar, 20-35 parts sodium feldspar, 10-20 parts nepheline, 5-10 parts washed clay, 3-10 parts calcined kaolin, 2-10 parts quartz, 3-10 parts alumina, 8-15 parts barium carbonate, 4-10 parts wollastonite, 0-5 parts calcined talc, 0-4 parts calcined zinc oxide, and 5-15 parts zirconium silicate. The raw materials for preparing the matte micro-engraved ink layer, by weight, include: 40-50 parts inorganic materials, 3-8 parts dispersant, and 40-60 parts ester solvent. The inorganic materials consist of bismuth vanadate and glass powder, with the initial melting temperature of the glass powder being 1130-1220℃.

The application relates to the technical field of glass ceramics, and discloses a tri-clinic nepheline glass ceramic as well as a preparation method and application thereof. The glass ceramic comprises the following components in terms of molar percentage: 43-58 mol% SiO2, 15-27 mol% Al2O3, 20-30 mol% Na2O, 0-10 mol% Li2O, 0-10 mol% K2O, 0-5 mol% P2O5 and 0-3 mol% ZrO2. The glass ceramic provided by the application has a crystallinity of more than 80%, a crystal size of less than 90 nm, an average transmittance of more than 90% in a visible light band, and a crystal phase composition containing only a main crystal phase tri-clinic nepheline phase or containing a secondary crystal phase nepheline phase and a phosphate phase. The reduction or removal of the phosphate phase in the crystal phase improves the chemical stability of the glass ceramic and enables chemical strengthening.

The application discloses a kind of multi-stage nepheline concentrate powder production methods, comprising: step 1: nepheline raw ore is crushed, washing, middle crushing, first screening classification, fine crushing, obtains nepheline powder and slurry I;Step 2: nepheline powder is ground, second screening classification, first hydrocyclone classification, obtain coarse-grained ore pulp and argillaceous ore pulp;Step 3: coarse-grained ore pulp is obtained by coarse-grained wet classification magnetic separation, coarse concentrate I, coarse-grained tailings;Argillaceous ore pulp is obtained by second hydrocyclone classification, fine-grained wet classification magnetic separation, coarse concentrate II, slurry II and fine-grained tailings;Step 4: coarse concentrate I is concentrated, dried, dry magnetic separation classification, ball milling, wind classification, obtains first grade nepheline concentrate and second grade nepheline concentrate;Coarse concentrate II is dehydrated, dried, obtains third grade nepheline concentrate.The comprehensive second hydrocyclone classification, wet magnetic separation, dry magnetic separation, multi-scale grinding, can simultaneously carry out the production of three high-quality nepheline concentrate powder.

The invention relates to the field of tempered glass, and particularly discloses anti-dazzle high aluminosilicate microcrystalline glass containing a nano nepheline phase as well as a preparation method and application of the anti-dazzle high aluminosilicate microcrystalline glass. The glass ceramic is prepared from the following components in percentage by weight: 20 to 1.5 percent of SiO2, Al2O3, Na2O, K2O, P2O5, MgO and ZrO; wherein the mass percentage content of P2O5 is 4.5 to 14.0 percent, and the weight ratio of Al2O3 to P2O5 is 0.5 to 4.4. According to the method, annealing is controlled after melting forming, and a single nepheline phase with the average size smaller than 100 nm is directionally separated out in a glass matrix. After the material is subjected to chemical strengthening, the stress layer depth larger than 50 microns and the surface compressive stress larger than 750 MPa can be obtained, the anti-falling performance is remarkably improved, and meanwhile the high light transmittance of 90% or above is kept. In addition, by means of selective etching of acid liquor on the split-phase structure, uniform spherical pits with the roughness being 0.05-0.4 micrometer can be formed in the surface of the split-phase structure, and the excellent anti-dazzle effect is achieved. The microcrystalline glass is suitable for cover plate glass in various fields of mobile terminals, vehicle-mounted displays and the like.

The invention discloses an application method of an environment-friendly high-temperature copper glaze fired in a multi-element atmosphere, which comprises the following steps: step 1, weighing the following raw materials in percentage by weight: 30-32% of nepheline syenite, 5-10% of talc, 4-9% of kaolin, 15-18% of calcite, 30-35.5% of quartz, 4-9% of barium carbonate, 0.8-2% of additional tin oxide and 0.2-1.4% of copper oxide, and uniformly mixing to obtain powder; 2, mixing and ball-milling are carried out; step 3, sieving the glaze slip with meshes, and aging to obtain glaze; and 4, applying the glaze to the surface of the green body, drying, and sintering in an oxidizing or reducing atmosphere to obtain the environment-friendly high-temperature copper glaze decoration product. The technology provides an original solution for solving the long-standing core technology contradiction of'atmosphere sensitivity 'and'environmental protection' of the high-temperature copper glaze, so that the high-temperature copper glaze has a relatively good market prospect.

The invention provides a green and environment-friendly high-alumina fly ash multi-component synergistic extraction method, and belongs to the technical field of fly ash extraction. The preparation method comprises the following steps: adding sodium carbonate into fly ash serving as a raw material, mixing and calcining to obtain a nepheline phase which is easily soluble in an acidic medium; then adding sulfuric acid to decompose the sintered product to dissolve the sintered product, heating and aging to separate silicon from aluminum to obtain silica gel and a metal salt solution, using the silica gel to prepare white carbon black, and separating and purifying the metal salt solution to prepare aluminum oxide, iron oxide, calcium hydroxide and magnesium hydroxide. According to the method, the problems of low utilization rate and impure product in the traditional extraction process are better solved, the utilization rate of useful substances in the fly ash can reach 95% or above, and the method is more environment-friendly, so that green, refined and efficient utilization of the fly ash is realized.

The invention discloses a multi-stage nepheline concentrate powder production method which comprises the following steps: step 1, performing coarse crushing, ore washing, intermediate crushing, primary screening and grading and fine crushing on nepheline raw ore to obtain nepheline powder and muddy water I; 2, the nepheline powder is subjected to ore grinding, second-time screening classification and first-time hydraulic cyclone classification, and coarse-grained ore pulp and argillaceous ore pulp are obtained; 3, the coarse-fraction ore pulp is subjected to coarse-fraction wet-type grading magnetic separation, and coarse concentrate I and coarse-fraction tailings are obtained; the argillaceous ore pulp is subjected to secondary hydraulic cyclone classification and fine-fraction wet classification magnetic separation to obtain rough concentrate II, muddy water II and fine-fraction tailings; 4, the rough concentrate I is subjected to concentration, drying, dry magnetic separation classification, ball milling and wind classification, and first-stage nepheline concentrate and second-stage nepheline concentrate are obtained; and dehydrating and drying the rough concentrate II to obtain third-level nepheline concentrate. And the production of three-stage high-quality nepheline concentrate powder can be simultaneously carried out by integrating two-stage hydraulic cyclone classification, wet magnetic separation, dry magnetic separation and multi-scale ore grinding.

The application discloses an application method of an environment-friendly high-temperature copper glaze fired in a multi-element atmosphere, and comprises the following steps: S1, uniformly mixing raw materials according to the following weight percentage: 30-32% of nepheline syenite, 5-10% of talc, 4-9% of kaolin, 15-18% of calcite, 30-35.5% of quartz, 4-9% of barium carbonate, 0.8-2% of tin oxide and 0.2-1.4% of copper oxide to obtain powder; S2, performing mixed ball milling; S3, performing glaze pulp mesh screening and aging to obtain glaze material; and S4, applying the glaze material to the surface of a blank, drying, and firing in an oxidizing or reducing atmosphere to obtain an environment-friendly high-temperature copper glaze decoration product. The application provides an original solution for solving the contradiction between the atmosphere sensitivity and the environmental protection of the high-temperature copper glaze, and therefore has a good market prospect.

The invention discloses microcrystalline glass based on oil shale waste and phosphorus slag as well as a preparation method and application of the microcrystalline glass, and belongs to the technical field of inorganic non-metallic materials. The invention solves the problems of high cost, large energy consumption, low solid waste resource utilization rate, narrow glass formation area of single OSA or PS-based glass ceramics, difficult crystallization control, large flux raw material consumption and the like in the traditional glass ceramics. The preparation method comprises the following steps: pretreating and mixing oil shale residues and phosphorus residues, adding a nucleating agent titanium dioxide and a fluxing agent anhydrous sodium carbonate, carrying out high-temperature melting, pouring and compression molding to prepare precursor glass, annealing the precursor glass to eliminate internal stress, carrying out heat preservation to obtain base glass, and carrying out one-step crystallization heat treatment on the base glass to obtain the high-strength glass. The microcrystalline glass is obtained. The microcrystal glass takes nepheline as a main crystal phase, is high in hardness, low in water absorption rate and good in corrosion resistance, has biological safety, and can be applied to the fields of building decoration and power transmission engineering.

The present application relates to the field of oil and gas well cementing engineering, and discloses a cement strength stabilizing material, an oil well cementing cement slurry system and application thereof.The cement strength stabilizing material comprises 30-80 parts by weight of a first strength stabilizing material and 20-70 parts by weight of a second strength stabilizing material; wherein the first strength stabilizing material is a mixture of quartz sand and glass powder; and the second strength stabilizing material is a mixture of at least two selected from spodumene, andalusite, olivine, leucite, garnet, pyrope, almandine, grossular, epidote, nepheline, staurolite, spinel and graphite.The cement slurry system containing the cement strength stabilizing material of the present application is suitable for both high-temperature direct forming working conditions of deep wells and super-deep wells and low-temperature forming and high-temperature service working conditions of heavy oil steam production, has good comprehensive performance, and has a broad market application prospect.

The application relates to the field of paint technology and relates to a stone-imitating fluorocarbon paint and a preparation method thereof. The stone-imitating fluorocarbon paint is prepared from the following components in parts by mass: fluorocarbon resin 35-50 parts, nepheline powder 10-20 parts, potassium aluminosilicate 5-15 parts, rutile titanium dioxide 3-8 parts, inorganic color paste 1-5 parts, silane coupling agent 0.5-2 parts, polyamide wax anti-settling agent 0.3-1.5 parts, fumed silica 0.5-2 parts, organic silicon leveling agent 0.1-0.8 parts, modified hydrogenated castor oil 0.2-1 part, aliphatic isocyanate curing agent 5-12 parts and mixed solvent 10-20 parts. The stone-imitating fluorocarbon paint has excellent weather resistance, can effectively resist the influence of environmental factors such as ultraviolet rays, acid rain and temperature change, significantly reduces the occurrence probability of phenomena such as discoloration, powdering and peeling, prolongs the service life of the paint and ensures long-term stable decoration effect.

The present invention relates to the technical field of glass ceramics, and disclosed therein are a triclinic nepheline glass ceramic, and a preparation method therefor and the use thereof. The glass ceramic comprises the following components in molar percentages: 43-58 mol% of SiO2, 15-27 mol% of Al2O3, 20-28 mol% of Na2O, 0-10 mol% of Li2O, 0-10 mol% of K2O, 1-5 mol% of P2O5, and 0.3-3 mol% of ZrO2. According to the glass ceramic provided by the present invention, the crystal phase composition can only include a main crystal phase of a triclinic nepheline phase, or can further include a secondary crystal phase of a nepheline phase and a phosphate phase, and the phosphate phase in the crystal phase is reduced or removed, thus improving the chemical stability of the glass ceramic.

This invention belongs to the field of protective coating technology, specifically disclosing a thermally adaptive coating and its preparation method. The method includes mixing a modified fluororubber matrix, oriented sheet filler, and a thermal expansion regulator by weight, followed by high-speed stirring for 15-20 minutes and ultrasonic dispersion for 8-12 minutes to obtain the coating. The modified fluororubber matrix is ​​selected from silicone-modified fluororubber; the oriented sheet filler is one or more of talc, vermiculite, and mica powder with a thickness-to-diameter ratio ≥ 50:1; and the thermal expansion regulator is one or more of cordierite, perovskite, and β-nepheline. The coating of this invention is composed of modified fluororubber, oriented sheet filler, and thermal expansion regulator. Through the synergistic effect of these three components, the fluororubber coating achieves an elongation at break >150%, an elasticity retention rate >90% after thermal cycling at 400℃ / 1h, and an interfacial adhesion strength ≥5MPa. After more than 300 thermal cycles, the coating remains crack-free and maintains its integrity, providing a long-life, highly reliable solution for extreme temperature cycling scenarios.

The invention discloses a ground coat for a matt brick, a preparation method and application. The ground coat for the matt brick is prepared from 39 wt%-46 wt% of potassium-sodium feldspar, 6 wt%-9 wt% of quartz, 2 wt%-5 wt% of nepheline, 5 wt%-8 wt% of calcined kaolin, 1 wt%-3 wt% of talc, 2 wt%-4 wt% of wollastonite, 7 wt%-9 wt% of washed kaolin, 12 wt%-16 wt% of aluminum oxide and 7 wt%-10 wt% of zirconium silicate. In the ground coat for the matte brick, the proportion of silicon to aluminum is high, the proportion of calcium to magnesium is low, and generation of miliaria, blistering and other defects can be reduced.

This application relates to the field of door lock lever materials technology, specifically disclosing a polypropylene composite material comprising the following components by weight: 90-110 parts of polypropylene resin, 15-25 parts of negative thermal expansion filler, 3-8 parts of low moisture expansion filler, 10-15 parts of reinforcing fiber, and 5-10 parts of other additives; the negative thermal expansion filler is selected from one or more of rare earth tungstate, β-lithium nepheline, and aluminum titanate; the negative thermal expansion filler is modified with a silane coupling agent at a temperature of 110-130℃ for 20-40 minutes; the low moisture expansion filler has a specific surface area of ​​100-300 m². 2 / g of fumed silica. The door lock rod made from the polypropylene composite material provided in this application has good environmental adaptability and is not easily deformed in extreme environments such as high temperature and high humidity, and has good application prospects.