55results about How to "Cracking will not" patented technology

The invention belongs to the technical field of building materials, and in particular relates to a high-flexibility and low-shrinkage fiber reinforced cement-based composite material. The composite material is prepared by mixing cement, coal ash, silicon powder, gypsum, an expanding agent, a water reducing agent, a shrinkage reducing agent, a defoaming agent, a thickening agent, fine sand, fibers and water, wherein the total mass percentage of the cement, the coal ash, the silicon powder, the gypsum, the expanding agent, the water reducing agent, the shrinkage reducing agent, the defoaming agent, the thickening agent, the fine sand and the fibers is 77-85 percent, and the mass percentage of the water is 15-23 percent. The fiber reinforced cement-based composite material has the performance characteristics of low shrinkage, high flexibility, small crack width, quickness in condensation and early strength and is high in compressive strength and good in synergism with other materials.

The invention discloses a matrix and a welding method for the matrix and a diamond piece, and belongs to the technical field of surface processing and coating. The matrix is provided with a cross recess; the cross recess is provided with notches formed in the side surfaces; the section of the cross recess is rectangular, V-shaped or arc-shaped; the surface of the matrix is not limited to be horizontal, crossed, annular and/or grid-shaped. According to the welding method, the problem that a diamond is cracked due to different thermal expansion coefficients in a brazing process of a diamond brazing tool as a metal surface with a large thermal expansion coefficient has an expansion joint during cooling after high temperature welding is completed is solved. By the adoption of a method for slotting the surface of the metal matrix welded with the diamond (to achieve the effect of the expansion joint), the problem of cracks caused by different thermal expansion coefficients between the diamond and the tool matrix during welding is effectively avoided, and the whole strength of the diamond tool cannot be affected; therefore, a diamond material with an extremely low thermal expansion coefficient cannot be cracked.

The invention relates to the field of building waterproofing, and discloses modified-fiber-modified waterproofing slurry and a preparation method thereof. The waterproofing slurry is prepared from thefollowing components by weight: a powder material comprising 50-70 parts of Portland cement, 20-35 parts of quartz sand, 5-13 parts of quartz powder, 2-3 parts of metakaolin, 0.1-0.3 part of a dry powder water reducer, 0.1 to 0.3 part of a dry powder defoamer, 0.01 to 0.05 part of cellulose ether, 0.1 to 0.3 part of an organosilicon water repellent, 0.3 to 0.5 part of zinc stearate and 0.1 to 0.3part of glass fiber reinforced modified fiber, and a liquid material comprising 50-70 parts of water, 30-50 parts of emulsion, 0.1-0.3 part of an antifoaming agent, 0.1-0.3 part of a bactericide, 0.1- 0.3 part of a water reducing agent and 0.3 - 0.5 part of an antifreeze; wherein the ratio of liquid material: powder material is 1: (2.5 - 3). The modified-fiber-modified waterproofing slurry has ultra-high flexural and compressive strength, and due to the presence of the modified fiber, powder and residue falling and water-repellent layer peeling off caused by an external force can be effectively prevented.

The invention relates to a machining method of a whole-wood and fresh-wood cutting board. The machining method comprises the following steps: preparing a whole-wood and fresh-wood cutting board or a semi-finished product or a board blank; preparing a protection solution with mould-proof and anti-cracking functions; loading into a basket, feeding into a pot, discharging from the pot, washing, unloading from the basket, aging, finely machining and packaging. By adopting the machining method, a gap of the factory-oriented mass production in the field can be filled, the machined cutting board is maintained in an original shape and original ecology and is wet, fresh and saturated, wood grains are attractive and clear, the original color and original shape can be maintained, no metal hoop is needed on the periphery, the problems such as mildewing, color changing and cracking of the whole-wood and fresh-wood cutting board in the production process, the sales process and the application process of customers can be well solved, and the visual effect of the cutting board can be prevented from being seriously affected.

The invention relates to the field of chemical powder coating, in particular to a bend-resistance powder coating. The invention aims to provide bend-resistance powder coating which can ensure powder coating films that are more than 60 micrometers thick on workpieces do not crack when the powder coating is sprayed on box bodies, the workpieces or various antitheft doors and the box bodies, the workpieces or the various antitheft doors are punched at 90 to 180 DEG, in order to overcome the low bend resistance drawback of the conventional powder coating. The technical scheme adopted by the invention is implemented as follows: the components of the bend-resistance powder coating include carboxyl resin, triglycidyl isocyanurate (TGIC), BaSO4(filler), delustering agent 803A, curing agent 32-18A and pigment, wherein the acid value of the carboxyl resin is 20 to 40 micrograms of KOH per gram, and the pigment is one or more of titanium white, ferrite yellow, iron oxide red and dry-ground black limestone powder.

The invention discloses a crack resistant coating and a preparation method thereof, and relates to the technical field of coatings, the crack resistant coating is prepared from the following raw materials by weight: 20-30 parts of silicone rubber, 25-40 parts of talcum powder, 15-35 parts of peach gum, 10-15 parts of an emulsifier, 20-25 parts of gloss oil and 3-7 parts of water; the preparation method comprises the following steps: A. smashing the silicone rubber and the peach gum into powder, adding the water and the emulsifier for mixing, and using an emulsification machine to prepare emulsion; B. adding the talcum powder into the emulsion, using a mixer for stirring and mixing in the stirring speed of 500r /min-800r /min for stirring time of 20 minutes-30 minutes to obtain a primer; and C. when in use, coating with a primer, then coating the outer layer of the primer with the gloss oil, and then curing to obtain the crack resistant coating. Compared with the prior art, the crack resistant coating solves the problem that coatings in the prior art are easy to crack.

The invention discloses a cracking-resistant salt and chemical making equipment pipe. The cracking-resistant salt and chemical making equipment pipe comprises a salt and chemical making equipment pipe body, wherein a plurality of tightening rings sequentially sleeve the outer side wall of the salt and chemical making equipment pipe body along the length direction of the slat and chemical making equipment pipe body; each tightening ring consists of two symmetric half arcs; one sides of the tightening rings are connected to one another through hinges; the other sides of the tightening rings are fixed through bolts; the tightening rings apply a radial pre-compression force pointing to an axis to the salt and chemical making equipment pipe body; and the radial pre-compression force is equal to or greater than pressure of brine in the salt and chemical making equipment pipe body. By the structure, the radial pre-compression force is applied to the salt and chemical equipment pipe body of the cracking-resistant salt and chemical making equipment pipe, pressure of the brine in the salt and chemical making equipment pipe body on the salt and chemical making equipment pipe body is counteracted, even if the inside of the salt and chemical making equipment pipe body is subjected to pitting corrosion under a long-term effect of the brine in the salt and chemical making equipment pipe body, the circumstance that pitting corrosion portions crack due to pressure stress of the brine is avoided, and the service life of the salt and chemical making equipment pipe body is prolonged.

The invention relates to a thermal-shock resistant, corrosion resistant zirconia-carbon-containing refractory material which is mainly applied to a submersed nozzle used in steel-making and continuous casting. According to the zirconia-carbon refractory material, zirconia particles are combined with carbon to form a network structure; gaps of the network structure are filled with graphite with high heat conductivity to raise thermal shock resistance of the material; high-temperature metal plastic molybdenum disilicide with the surface coated with a dense silicon dioxide protective film is added to alleviate thermal stress of the material during the using process; and macrovoid ratio and contact area of melt cinder and zirconia in use are minimized to reduce washout and erosion of melt cinder to the zirconia-carbon refractory material. Total porosity of the material is less than 20%, wherein the volume fraction of pores with the size of below 10 microns is more than 85% of that of the total pores. The zirconia-carbon refractory material provided by the invention has good erosion resistance. Thermal shock resistance is not reduced. The zirconia-carbon refractory material will not be cracked or damaged when in use.

The invention discloses an anti-cracking salt chemical engineering equipment pipeline. The anti-cracking salt chemical engineering equipment pipeline comprises a salt chemical engineering equipment pipeline body. The outer side wall of the salt chemical engineering equipment pipeline body is sequentially sleeved with a plurality of lock rings in the length direction of the pipeline body. Each lockring is of a structure with two symmetrical semi-circular arcs. One side of each lock ring is connected through a hinge, and the other side of each lock ring is fixed with a bolt. The lock rings haveradial pre-pressing force, pointing to the axis, on the salt chemical engineering equipment pipeline body, and the radial pre-pressing force is equal to or larger than the brine pressure inside the salt chemical engineering equipment pipeline body. According to the above structure of the anti-cracking salt chemical engineering equipment pipeline, the radial pre-pressing force is applied to the salt chemical engineering equipment pipeline body to offset the pressure of brine, inside the salt chemical engineering equipment pipeline body, on the salt chemical engineering equipment pipeline body,even though the inside of the salt chemical engineering equipment pipeline body generates corrosive pitting under the long-term action of the brine, the corrosive pitting positions can not crack under the pressure stress of the brine, and the service life of the salt chemical engineering equipment pipeline body is greatly prolonged.

The invention discloses crack-resistant glued laminated bamboo, which comprises a first bamboo blank layer (1) placed longitudinally, a second bamboo blank layer (2) placed obliquely at a certain angle and a third bamboo blank layer placed longitudinally (3). The first bamboo blank layer (1), the second bamboo blank layer (2) and the third bamboo blank layer (3) placed longitudinally are bonded and hot-pressed to form a whole. The crack-resistant glued laminated bamboo has the advantages of increasing tensile force of transverse fibers between the adjacent bamboo blank layers and preventing the bamboo blank layers from cracking.