41results about How to "To achieve toughening effect" patented technology

The invention belongs to the field of all-ceramics materials for the dentistry, and discloses a strengthening-toughening glass ceramic and a preparation method thereof. The strengthening-toughening glass ceramic comprises the following components in percentage by mass: 96 to 99% of basic component, and 1.0 to 4.0% of toughening component, wherein the basic component comprises the following components in percentage by mass: 58 to 62% of SiO2, 28 to 30% of Li2CO3, 3.5 to 4.0% of K2CO3, 2.5 to 3.0% of Al2O3, 11.4 to 1.6% of CeO2, and 2.6 to 3.0% of P2O5, and the toughening component is ZrO2.

The invention relates to a toughening epoxy resin composition for copper-clad plate. Except for lower dielectric constant and dielectric loss, the toughening epoxy resin composition has excellent mechanical property, high heat resistance and flame retardant property, also has a more compact structure, and can meet the demand of the copper-clad plate for a high-frequency circuit board.

The invention relates to a talcum powder master batch and a preparation method thereof. The talcum powder master batch comprises the following components: 75-84% of talcum powder, 15-25% of ethylene-octene copolymer, 0.3-0.6% of antioxidant and 0.3-0.6% of lubricant. The preparation method of the talcum powder master batch comprises the following steps of: adding all the components to a banbury mixer for banburying according to the proportion, wherein the banburying time ranges from 5 to 7 min and the temperature ranges from 110 to 130 DEG C; next, adding the mixture to a double-screw extruder for mixing, wherein the extrusion temperatures of the first section and the second section of the double-screw extruder range from 150 to 170 DEG C, and the extrusion temperatures of other several sections range from 170 to 200 DEG C; and the total stay time of the mixture in the double-screw extruder ranges from 3 to 8 min; and finally, extruding the obtained material, and then cooling and the material and performing grain-sized cutting, thereby obtaining the desired talcum powder master batch. As the talcum powder master batch is used, the dust pollution caused in the use of the traditional talcum powder is solved, and the tenacity of a modified polypropylene material can be improved so that the modified polypropylene material can keep excellent rigidity.

The invention discloses an antistatic reinforced PP/ABS alloy material and a preparation method thereof. The antistatic reinforced PP/ABS alloy material comprises the following raw materials in parts by weight: 35-55 parts of PP, 15-30 parts of ABS, 2-5 parts of a compatilizer, 0.3-0.6 part of a coupling agent, 0.3-0.5 part of a compound antioxidant, 3-5 parts of a compound antistatic agent, 0.3-0.5 part of a lubricant and 15-30 parts of alkali-free glass fiber. The antistatic reinforced PP/ABS alloy material has the advantages of high heat-resistance temperature, low shrinking percentage, low surface impedance, good mechanical property, wide application range and the like.

The invention provides a halogen-free flame-retardant high-toughness bulk molding compound and a method for preparing the same, and relates to the technical field of bulk molding compounds. The halogen-free flame-retardant high-toughness bulk molding compound comprises unsaturated polyester-polyurethane composite resin, curing agents, modified inorganic flame-retardant fillers, organic flame retardants, modified heavy calcium carbonate, release agents, reinforcement fibers, auxiliaries and toner. The method includes mixing raw materials for the halogen-free flame-retardant high-toughness bulkmolding compound with one another to form a compression molding or injection molding adhesive composite material 'in the shape of oil putty'; molding the compression molding or injection molding adhesive composite material by the aid of mold pressing processes to obtain the halogen-free flame-retardant high-toughness bulk molding compound. The halogen-free flame-retardant high-toughness bulk molding compound and the method have the advantages that unsaturated polyester and thermoset polyurethane interpenetrate network polymers, accordingly, the rigidity and the toughness of the halogen-free flame-retardant high-toughness bulk molding compound can be obviously improved, and the contraction ratio of the halogen-free flame-retardant high-toughness bulk molding compound can be reduced; multiple inorganic/organic composite halogen-free flame-retardant systems are used, synergistic effects can be realized by the multiple inorganic/organic composite halogen-free flame-retardant systems, accordingly, the halogen-free flame-retardant high-toughness bulk molding compound can be free of halogen and low in smoke and is nontoxic, environmental impact can be minimized, and the flame retardance of the halogen-free flame-retardant high-toughness bulk molding compound can be optimized.

The invention provides a sintering process of a petroleum fracturing propping agent, wherein the sintering process comprises the following steps: removing impurities from potassium feldspar, drying, and pulverizing to obtain potassium feldspar fine powder; uniformly mixing the potassium feldspar, graphite powder and magnesium powder, introducing protective gas, firing for 1-2 h at the temperatureof 600-700 DEG C, heating to 950-1100 DEG C, firing for 1-2 h, cooling, taking out, and crushing again to obtain secondary powder; and mixing the secondary powder with light calcined clay, sodium tripolyphosphate and tuff, carrying out spray mixing granulation and polishing to obtain ceramic primary particles, introducing protective gas, sintering the ceramic primary particles at the temperature of 1150-1210 DEG C for 0.5-1 h, continuously heating to 1250-1350 DEG C, and sintering for 1-2 h to obtain the petroleum fracturing propping agent. The method avoids the application of high-aluminum minerals, ensures the performance of the petroleum fracturing propping agent as much as possible, and has a great application prospect.

The invention discloses modified cyanate resin and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing 100 parts by mass of molten cyanate resin and 0.10-1.55 parts by mass of poly ionic liquid modified carbon nanotube hybrid material, and carrying out curing and after-treatment to obtain the modified cyanate resin. The synthesis process of the poly ionic liquid modified carbon nanotube hybrid material comprises the following steps: 1. synthesizing amino-terminated ionic liquid containing a transition metal; and 2. carrying out in-situ polymerization by using the ionic liquid to coat the carbon nanotubes. Compared with the cyanate resin, the modified cyanate resin prepared by the method disclosed by the invention has the advantages of favorable curing manufacturability, higher toughness, higher heat stability, stable dielectric constant and lower dielectric loss. The preparation method of the modified cyanate resin has the characteristics of simple technique, high controllability and the like.

The invention discloses a method for preparing a high-toughness cottonseed protein based composite membrane. The method comprises the following steps: (1) refining cottonseed protein; (2) preparing acottonseed protein solution and a water-soluble high polymer solution; (3) adding the cottonseed protein solution into the water-soluble high polymer solution, and carrying out uniform stirring at a certain temperature, so as to obtain a solution A; (4) adding a tertiary amine based alcoholic reagent into the solution A, and carrying out stirring for 1 to 5 hours in a thermostatic water bath withthe temperature of 40 DEG C to 60 DEG C, so as to obtain a solution B; and (5) after the solution B is cooled, preparing the cottonseed protein based composite membrane with relatively good toughnessby a casting method. Water-soluble high polymers include, but not limited to, polyvinyl alcohol, polyethylene oxide and gelatin; the addition level of the tertiary amine based alcoholic reagent is 5%to 30% the total mass of the cottonseed protein and the water-soluble high polymers; and a mass ratio of the cottonseed protein to the water-soluble high polymers is (9: 1) to (1: 9). According to themethod, on one hand, the tertiary amine based alcoholic reagent serves as a plasticizer, and thus, the elongation at break of the protein membrane is increased; and on the other hand, the tertiary amine based alcoholic reagent serves as a physical cross-linker, cross-linked bridges are formed between molecular chains of the cottonseed protein and the high polymers through hydrogen bonds under theaction of tertiary amine groups with relatively high electronegativity, a novel cross-linked network is formed, and thus, the tensile strength of the protein membrane is enhanced. Thereby, the high-toughness cottonseed protein based composite membrane is prepared.

This invention involves a aromatic amine epoxy curing agent and its preparation. The curing agent takes the nonylphenol and dibromo substitute hydrocarbon as raw materials. After coupling, nitration, reduction to obtain. Not add any toughening agent circumstances, impact toughness of curing product risen 30% than ordinary aromatic amine curing agent, also molecule contains more amid, making the curing agent activity, in the medium temperature (60-100 C degree) curing resins, made up the shortcomings of high curing temperature of aromatic amine curing agent.

The invention relates to a preparation method of a high-strength casting coating for a stainless steel casting, and belongs to the technical field of casting coatings. According to the preparation method of the high-strength casting coating for the stainless steel casting, zirconium sand, zirconium oxide whiskers and silicon carbide whiskers are used as refractory fillers, the zirconium oxide whiskers and the silicon carbide whiskers are modified by ethyl orthosilicate to prepare the high-strength casting coating for the stainless steel casting, the zirconium oxide whiskers and the silicon carbide whiskers are added into the coating, so that the strength of a coating film can be effectively improved; when the whiskers are subjected to external acting force, the whiskers bridged in the coating film can generate acting force to force cracks to be closed, so that the effect of consuming some external force to do work is achieved, then the toughness and strength of the coating film are improved, and when the cracks are diffused to the whiskers from the surface of the coating film, the diffusion direction of the cracks can be changed; and the cracks are diffused along the whiskers due to dissociation of the whiskers and the coating film, so that the area of the formed new surface is increased, the cracks can be within the critical size of the new surface, and the coating film is further reinforced.