35results about How to "Increased mechanical engagement" patented technology

The invention discloses an emulsion type carbon fiber sizing agent containing a nano material. The sizing agent comprises the following components in percentage by mass: 0.1-2% of a main sizing agent, 0.01-1% of a nano material, 0.05-2% of an emulsion agent, 0.05-0.1% of a dispersing agent, 0.15-8% of an organic solvent and 86.9-99.64% of deionized water. The sizing agent has the advantages the interface binding strength with carbon fibers is high and the surface free energy of the sized carbon fibers is no less than 55mN/m.

The invention discloses a method for adsorbing polymine on a carbon fiber surface in supercritical methanol, relates to a carbon fiber surface adsorption method, and aims to solve problems that an existing carbon fiber modifying method causes severe strength loss to the carbon fiber, is complex to operate, not suitable for being performed, low in bonding strength with resin. The method comprises the following steps: I, cleaning; II, oxidizing; III, adsorbing polymine in supercritical methanol to obtain carbon fiber, surface of which is adsorbed with the polymine, thereby completing grafting hexamine on the carbon fiber surface in the supercritical methanol. According to the method, interface shearing strength of the carbon fiber, surface of which is adsorbed with the polymine, is increased to 101.8 MPa-103 MPa from unmodified 64.9 MPa, and increased by 56.9%-59.7%; impact strength is increased to 84.39 kJ/m<2>-86.7 kJ/m<2> from 55.77 kJ/m<2>. The invention discloses a method for grafting hexamine on the carbon fiber surface.

A furniture item and a method for its manufacture, the item comprising at least one support portion, said at least one support portion (24,26) comprising a receiving frame (30) and a support member (50) comprising a webbing (54) made of flexible material fitted at its edges with frame-engaging profiles (56) formed with first engaging members (66) for secure engagement with corresponding second engaging members (32) of the receiving frame (30); the invention characterized in that said frame-engaging profiles (56) are integrally molded with said webbing (54).

The invention relates to a UiO-66-(COOH) 2/dopamine synergistically modified carbon fiber reinforced paper-based friction material and a preparation method thereof. The preparation method comprises the steps that carbon fibers with clean surfaces are sequentially placed in trihydroxymethyl aminomethane (Tris buffer solution) and a dopamine solution, and a high-adhesion dopamine flexible film grows and wraps the surfaces of the carbon fibers; then, based on a hydrothermal reaction, a UiO-66-(COOH) 2 crystal layer grows on the surface of the carbon fiber in situ, and after the reaction is completed, the modified carbon fiber is fully washed and dried. An interface structure is constructed and reinforced by adopting the bi-component modified carbon fibers and a resin matrix, and the UiO-66-(COOH) 2/dopamine synergistically modified carbon fiber reinforced paper-based friction material is prepared. The dynamic friction coefficient of the UiO-66-(COOH) 2/dopamine synergistically modified carbon fiber reinforced paper-based friction material prepared by the preparation method disclosed by the invention is increased to 0.1353 from 0.1044, and the amplification is 29.60%. The wear rate is reduced from 3.35 * 10 <-8 > cm < 3 >. J <-1 > to 2.65 * 10 <-8 > cm < 3 >. J <-1 >, and the reduction amplitude is 20.89%. The result shows that the UiO-66-(COOH) 2/dopamine synergistically modifies and reinforces the material interface structure, and the friction and wear performance of the paper-based friction material can be remarkably improved.

An electrical connector for engaging with an electronic card has a insulative housing with a plurality of receiving spaces, a plurality of terminals respectively mounted in the receiving spaces of the insulative housing, and an operating member pivotally connected to the insulative housing. The operating member controls the terminals in the insulative housing to be moved for electrically and mechanically engagement with the electronic card. Each of the terminals has a base portion, an upper arm and a lower arm. The upper arm is connected to the base portion at a joint as a first fulcrum. The lower arm is connected to the base portion at another joint as a second fulcrum. As the operating member pivotally moves to a predetermined position, the upper arm and the lower arm respectively rotate about the first fulcrum and the second fulcrum to securely grasp the electronic card.

A method for preparing an anticorrosion antioxidation material is disclosed. The method includes firstly adding bamboo powder into a NaOH solution containing cytosine; soaking and reacting the bamboopowder; then reacting the alkali-treated bamboo powder in an ethanol solution containing vinyltrimethoxysilane to obtain silane-modified bamboo powder; modifying and reacting alkali-treated bamboo powder in distilled water containing stearic acid and ammonium 3-bromocamphor-8-sulfonate to obtain bamboo powder modified with stearic acid; finally fully mixing the silane-modified bamboo powder, the bamboo powder modified with stearic acid, polypropylene powder and an antioxidant; and subjecting the mixture to melting and granulation to obtain the anticorrosion antioxidation material. Beneficial effects are that the method can effectively improve roughness of the surface and inside of bamboo powder, polarity of the bamboo powder is increased, the degree of crystallization of cellulose molecules is increased, mechanical meshing between the bamboo powder and a resin matrix is further improved, the density and uniformity of the composite material are improved, and mechanical strength and an antioxidation function of the material are improved.

The invention discloses a composite internal-curing shrinkage-reducing anti-cracking agent for concrete and a production method of the composite internal-curing shrinkage-reducing anti-cracking agent, and belongs to concrete additives. The agent is prepared from the following components in parts by weight: a modified expanding agent, acrylic acid modified polypropylene fibers, graphene oxide and a polycarboxylic acid water reducing agent. The graphene oxide is used as an adsorption point to adsorb acrylic acid modified polypropylene fibers to form a three-dimensional network branch-tendril-shaped capillary structure, and countless uniformly-distributed micro water storage tanks are formed in the concrete, so that the hydration reaction of a cementing material is promoted to the greatest extent, and the deformation performance, the crack resistance and the durability of the concrete are obviously improved.

A molding apparatus includes two mold tools that define and bound a mold cavity therebetween, for three-dimensionally press-molding a trim component. To minimize or avoid shrinkage or pull-back recession of the edge of the trim component during the molding process, at least one of the mold tools, on its molding surface bounding an end portion of the mold cavity, includes at least one grip-enhancing structure that provides increased grip on an edge portion of the trim component. The grip-enhancing structure may be or include a rough surface, a geometric configured surface, a geometric gripping edge, a surface coating, or mechanical engagement members. The grip-enhancing structure provides increased grip on the edge portion of the trim component by narrowing the mold cavity space, by increasing the surface friction or adhesion, and/or by mechanically engaging the material of the trim component. Thereby, the edge of the trim component is held in place while the three-dimensional molding proceeds and until the molded contour of the component is fixed.

The invention relates to a preparation method of a ceramic material, particularly a preparation method of a ceramic material capable of generating carbon nanowires in situ. The method aims to solve the problems of high complexity and high condition requirements in the existing carbon nanowire preparation technique. The method 1 comprises the following steps: 1. carrying out resin solidification; 2. carrying out ball milling to obtain powder; 3. carrying out pre-press forming; 4. carrying out pyrolytic cracking; and 5. cooling to obtain the in-situ-generated carbon nanowire ceramic material. The method 2 comprises the following steps: 1. carrying out resin solidification; 2. carrying out ball milling to obtain powder; 3. carrying out hot-press forming; and 4. cooling to obtain the in-situ-generated carbon nanowire ceramic material. The method is simple and convenient, does not need complicated equipment or experimental steps, is low in cost, and can perform carbon nanowire in-situ generation inside the ceramic material. The method can promote the conductivity of the material. The method is applicable to the field of ceramic materials.

The invention belongs to the technical field of artificial board manufacturing, particularly relates to a surface control technology for a PB cold-bonded board, and solves the problems that in the prior art, the requirements of PB board veneering treatment on technological parameters are relatively high, the produced veneered PB board is limited by the production technology level, glue failure, blistering, low bonding strength and the like are easy to occur. According to the technology, the PB cold-bonded board is formed by connecting a composite veneer, a plain board and a composite veneer through an adhesive I from top to bottom and performing cold press molding and post-treatment finally. According to the technology, the composite veneers, the plain board and the adhesive I are prepared, the composite veneer, the plain board and the composite veneer are connected through the adhesive I, and finally, cold press molding is performed to obtain the PB cold-bonded board. The preparation method is simple, cold press molding and cold press curing technologies are adopted, the technological parameter requirements are low, production operation is easy, the preparation cost is low, and the technology is suitable for industrial production.

The invention discloses a method of grafting hexamine on a carbon fiber surface in supercritical methanol and relates to a carbon fiber surface modification method. The method aims at solving the problems that few groups are grafted onto a carbon fiber and distributed on the carbon fiber nonuniformly, and the bonding strength of the modified carbon fiber with resin is low for the existing carbon fiber surface modification method. The method of grafting hexamine on the carbon fiber surface in supercritical methanol comprises the steps: I, cleaning, II, oxidizing, III, acylating chlorination, IV, alcoholysis, and V, grafting of hexamine in supercritical methanol to form the carbon fiber with hexamine grafted on the surface. Interfacial shear strength of the carbon fiber with hexamine grafted on the surface is improved to 106.1MPa from 64.9MPa of a precursor fiber by 63.5%.The method of grafting hexamine on the carbon fiber surface in supercritical methanol can be obtained.

The invention discloses a preparation method of a carbon nanotube reinforced fiber metal laminate, and belongs to the field of composite material preparation. According to the method, carbon nanotubes are deposited on titanium plates subjected to different surface treatment through electrophoretic deposition, absolute ethyl alcohol is adopted as a dispersion solution of the carbon nanotubes, and the stability of suspension liquid is improved by oxidizing the carbon nanotubes through mixed acid. According to the preparation method, the compatibility of the surfaces of the titanium plates and resin is improved, and the carbon nanotubes can be well embedded into the resin and the grooves in the surfaces of the titanium plates, so that the interface performance of the fiber metal laminate is improved, the preparation process is simple, and the time used in the deposition process is short. The method is not limited to stable titanium alloy surfaces, and can also be used for bonding metal with complex structures and resin.