5results about How to "Improved dynamic fatigue performance" patented technology

The invention discloses a glass fiber reinforced rubber composite material and a preparation method thereof. The preparation method comprises the following steps: modifying the glass fiber by using an amino-epoxy silane compound coupling agent solution, and then stirring the modified glass fiber with part of the rubber matrix, the liquid interface compatilizer and silane-treated boron nitride in a closed container at a high speed to prepare uniform mixed slurry; and mixing the residual rubber matrix, the vulcanization system and the reinforcing filler, adding the mixed slurry, and carrying out mold pressing vulcanization to obtain the composite material. The compound coupling agent and the liquid interface compatilizer cooperatively construct a tough interface, a step-by-step process of prefabricated mixed slurry is combined, efficient dispersion and structural protection of the fibers and the functional filler are achieved, and the obtained composite material has excellent tensile strength and tearing strength, low dynamic heat generation and high thermal conductivity; the technical problems that traditional glass fiber reinforced rubber is weak in interface bonding, uneven in dispersion and single in function are solved.

This invention belongs to the field of buffer material technology, specifically disclosing a buffer block for a pump air bag, its preparation method, and its application. The raw materials for preparing the core layer of the buffer block include a polyurethane prepolymer and a chain extender composition A, and the raw materials for preparing the shell layer of the buffer block include a polyurethane prepolymer and a chain extender composition B. By weight, the chain extender composition A includes 60-80 parts of MOCA chain extender, 40-60 parts of hexanediol, 2-5 parts of epoxidized soybean oil, 3-5 parts of water, 0.5-1 parts of antioxidant, 0.5-2 parts of catalyst, and 0. 5-2.5 parts; Chain extender composition B includes 100-120 parts of MOCA chain extender, 10-15 parts of modified calcium carbonate whiskers, 1-1.5 parts of hydrolysis resistant agent, 0.5-1 part of antioxidant, 0.5-2 parts of catalyst and 0.5-2.5 parts of foam stabilizer. The buffer block as a whole can effectively stabilize the pressure, adapt to complex conveying media, and has excellent dynamic fatigue performance. Its application in the air jacket structure of mud pumps helps to effectively stabilize the pressure of mud pumps for a long time, and its application prospects are good.

The present application relates to a kind of rubber nanocomposites, especially relates to a kind of wet mixing rubber masterbatch containing trans-polybutadiene rubber and the preparation method and application of composite material.The composite material is made of the following components by weight parts:20-95 parts of wet mixing rubber masterbatch, 0-20 parts of natural rubber NR, 0-15 parts of butadiene rubber BR, 5-15 parts of trans-polybutadiene rubber TBIR, 0-60 parts of other rubber, 0-30 parts of carbon black, 0.3-5 parts of accelerator, 0.3-8 parts of sulfur, 1-4.5 parts of zinc oxide, 1-9 parts of stearic acid, 1-5 parts of antioxidant, and 0-20 parts of other additives.The wet mixing technology is used in the mixing rubber masterbatch, a large amount of filler and rubber are dispersed first, the masterbatch with good dispersion of filler and additives is prepared, and then other rubber is mixed and vulcanized, to reduce the environmental pollution in preparation.The fatigue resistance and wear resistance of the vulcanized rubber composite material are improved, and the rolling resistance is reduced, which can be applied to the tread, sidewall and upper triangular part of all-steel truck tire, all-rigid or semi-steel passenger car tire, and damping elastic element products.

The invention belongs to the field of rubber materials, and provides a rubber composition for a tire steel wire belt layer and a preparation method thereof, and the rubber composition comprises 70-90 parts of natural rubber, 20-40 parts of epoxidized natural rubber, 5-7 parts of a tackifying system, 50-65 parts of carbon black, 2-5 parts of an anti-aging agent, and 4-6 parts of a sulfur system. The tackifying system is prepared through a reaction of benzimidazole, a thiuram compound and omega-brominated fatty acid benzyl ester, and the omega-brominated fatty acid benzyl ester is prepared through a nucleophilic substitution reaction of omega-brominated fatty acid and benzyl bromide. Benzimidazole and a thiuram compound are bridged through a flexible aliphatic chain to form a tackifying system molecule, and the molecule can be chelated with copper / zinc / iron and other metal ions on the surface of a steel wire through a benzimidazole part, so that the initial bonding strength between rubber and the steel wire is improved; the thiuram part improves the interface stress distribution of the steel wire belt layer rubber and the steel wire, and the bonding performance of the steel wire cord fabric layer is improved.

The invention discloses a method for restraining aluminum alloy laser wire filling welding air holes through welding wire ultrasonic excitation, and belongs to the technical field of metal welding. According to the method, a welding system comprising a laser, a wire feeding device, an ultrasonic impact device, a movable platform and a control cabinet is adopted. The method is characterized in that welding wires on a conveying path are directly excited through an ultrasonic impact device, so that the welding wires vibrate at ultrasonic frequency and enter a molten pool. The method has double effects of'source hydrogen control 'and'process intervention', on one hand, ultrasonic vibration can effectively clean the surface of the welding wire, and a hydrogen source is reduced; and on the other hand, a molten pool inlet disturbance effect is generated when the vibration welding wire enters a molten pool, dendritic crystals are broken through micromechanical stirring, and bubble escape is promoted. According to the method, on-line continuous treatment without interrupting welding and polluting a molten pool is achieved, keyhole type and metallurgical type air holes are remarkably inhibited, the method is particularly suitable for automatic welding of two-series and six-series aluminum alloys, and the welding seam quality and the production efficiency can be effectively improved.