12results about How to "Small water absorption" patented technology

The present application belongs to the field of comprehensive utilization of solid waste resources, and relates to a calcium silicate board synthesized from industrial solid waste and a preparation method thereof. The calcium silicate board comprises oil-removed waste diatomite, fly ash, slaked lime, fiber and activator. In the present application, wood fiber is modified by hydrothermal treatment with citric acid modification, so as to reduce the water absorption of the wood fiber. The modified wood fiber is compounded with rock wool fiber to exert the tensile strength of the modified wood fiber and the heat resistance and chemical stability of the rock wool fiber. In the present application, a pre-hydration process is designed. After the oil-removed waste diatomite is mixed with the fly ash and reacts with excess calcium hydroxide, the product can provide nucleation sites as crystal nuclei, significantly accelerating the hydration kinetics process of the system. In combination with a continuous two-stage temperature-controlled steam pressure curing process, the crystal phase content of tobermorite in the calcium silicate board is increased, and the macroscopic performance of the material is comprehensively improved. Moreover, the present application can absorb a large amount of oil-containing waste diatomite and fly ash, realizing the resource utilization of industrial solid waste.

The utility model discloses a flame -retardant heat -insulation waterproof moisture -permeable fabric, including polytetrafluoroethylene moisture -permeable membrane, first flame -retardant fiber water -jet felt and second flame -retardant fiber water -jet felt, polytetrafluoroethylene moisture -permeable membrane with first flame -retardant fiber water -jet felt between, through first point shape flame -retardant adhesive and stick together, first flame -retardant fiber water -jet felt with second flame -retardant fiber water -jet felt between, through second point shape flame -retardant adhesive and stick together, wherein, second flame -retardant fiber water -jet felt has multiple pinholes of array, to increase the moisture -permeability of fabric. The utility model discloses a flame -retardant heat -insulation waterproof moisture -permeable fabric, polytetrafluoroethylene moisture -permeable membrane, first flame -retardant fiber water -jet felt and second flame -retardant fiber water -jet felt three layer materials and stick together, second flame -retardant fiber water -jet felt has multiple pinholes of array, and the whole fabric heat protection performance (TPP) is good, and the moisture -permeability is high, and has the function of moisture absorption and sweat -releasing.

The application relates to the technical field of welding materials, in particular to a high-stability lead-free soldering paste without an inner cover and a preparation method thereof, the lead-free soldering paste contains the following components in parts by weight: 10-14 parts of a soldering paste, 86-90 parts of lead-free soldering powder; the lead-free soldering powder is selected from one or more of Sn99Ag0.3Cu0.7, Sn98.5Ag1Cu0.5 and Sn96.5Ag3Cu0.5; the soldering paste contains the following components in parts by weight: 30-50 parts of rosin, 4-10 parts of resin, 30-50 parts of a solvent, 3-15 parts of an additive, 4-8 parts of a thixotropic agent, 5-10 parts of an organic acid, 0.5-3 parts of a halogen compound and 0.5-2 parts of an antioxidant. In the application, the prepared low-water absorption additive is introduced into the lead-free soldering paste to obtain a high-stability, low-water absorption soldering paste, the soldering paste can be stored for a long time without covering the inner cover, the material for producing the inner cover is saved, the packaging process is simplified, the storage time is prolonged, small and micro enterprises can concentrate on furnace welding, the welding time is reduced, and the energy consumption is reduced.

This invention relates to the field of preparation method technology and discloses a method for preparing a low-density nylon foam material. The method includes selecting nylon resin as the matrix material, wherein the nylon resin is a blend of PA6 and amorphous nylon PA610 in a specific ratio, wherein the mass ratio of PA6 to PA610 is 60:40 to 80:20, and the melt strength of the nylon resin is greater than or equal to 18 Pa·s; introducing a composite foaming agent, wherein the composite foaming agent is a combination of a chemical foaming agent and a physical foaming agent; and adding a nucleating agent, wherein the nucleating agent is nano-sized silica, nano-clay, talc, or a combination thereof, wherein the mass content of nano-silica is 0.5% to 2.0%. This invention can maintain stable dimensions and mechanical properties in humid environments and has a uniform and stable cell structure.

The application discloses a conductive silver paste for photovoltaic cells and a preparation method thereof. The conductive silver paste comprises the following raw materials in percentage: 65-85% of silver powder and 1-3% of modified binder, and the rest is an organic carrier. In the printing process of the conductive silver paste, the substances in the organic carrier contact the silver powder, so that the silver chelate in the organic carrier is fully contacted, and then a stable conductive path can be formed during baking. The modified binder is a lead-free glass formed by taking bismuth trioxide as a main raw material to form a bismuth-based glass. The addition of calcium fluoride in the raw material can reduce the water absorption of the bismuth-based glass, thereby ensuring the stability of the resistivity. The addition of titanium dioxide can exist in a quadruple coordination form, so that the Si-O-Si bond in the glass is changed into a Si-O-Ti bond, thereby forming an interconnected tetrahedral structure, increasing the network connectivity of the glass, and simultaneously increasing the antireflection effect of the glass and the utilization rate of light energy.

The utility model relates to cable technical field discloses a wear -resisting waterproof type power cable, including cable core and shielding layer, the number of cable core is three, the inside of shielding layer is located to cable core, the outer surface of cable core is fixedly connected with insulating layer, the inner chamber of shielding layer and be located between adjacent cable core and be provided with rebound rubber pipe, the utility model discloses a cable core, shielding layer and insulating layer can improve the insulation shielding performance of cable, through setting up rebound rubber pipe, can when the cable is extruded, to its buffer protection, avoid causing cable damage, through setting up waterproof layer, can improve the waterproof performance of cable, through setting up function layer, can improve the heat -proof flame -retardant performance of cable, through setting up wear -resisting layer, can improve the wear resistance of cable, through setting up above structure, can improve the wear -resisting waterproof ability and pressure -resistance of cable, to be able to satisfy the special use demand of user.

The application relates to the field of concrete, and particularly discloses a steam pressure aerated concrete prepared from furnace bottom slag and a preparation method thereof. The steam pressure aerated concrete prepared from the furnace bottom slag comprises granulated blast furnace slag, carbon slag, quartz sand, Portland cement, lime, desulfurization gypsum, aluminum powder, reinforcing fiber and foam stabilizer. The preparation method is as follows: the granulated blast furnace slag, the carbon slag, the quartz sand and water are mixed to prepare a slurry, the lime and the desulfurization gypsum are added to the slurry and stirred, the reinforcing fiber is added to the slurry, the Portland cement is added after the slurry is uniformly stirred, the foam stabilizer is added, the aluminum powder is added after the slurry is thickened and kept, and the slurry is poured into a mold after being stirred, the concrete in the mold is cured, the mold is demolded, the green body is cut, the green body is high-temperature and high-pressure steam cured, and the steam pressure aerated concrete is prepared. The steam pressure aerated concrete prepared from the furnace bottom slag has the advantages of solving the problem of high water absorption of the steam pressure aerated concrete.

The invention provides a negative photosensitive composition containing a bismaleimide compound A as shown in a structural formula (I) and a polyimide precursor B with a structure as shown in a structural formula (II). The composition can form a relief pattern cured film with excellent mechanical property, high resolution, low water absorption, strong adhesion and corrosion resistance after being subjected to photoetching and high-temperature curing, and is suitable for the fields of semiconductor packaging (such as redistribution layers (RDL), interlayer insulation buffer films, cover coatings and surface protection films), display manufacturing and the like.

The utility model relates to the technical field of sealing rubber strips, in particular to a self-adhesive sealing rubber strip. According to the technical scheme, the sealing rubber strip comprises a sealing rubber strip body and a self-adhesive adhesive layer, the self-adhesive adhesive layer is arranged on the upper surface of the sealing rubber strip body, a first isolating membrane layer is arranged on the upper surface of the self-adhesive adhesive layer, a dust sticking adhesive layer is arranged on the upper surface of the first isolating membrane layer, and a second isolating membrane layer is arranged on the upper surface of the dust sticking adhesive layer. A water absorbing layer is arranged on the upper surface of the second isolating membrane layer. Before the sealing rubber strip is adhered through the adhesive layer, water drops and dust on the surface of an adhered object can be conveniently removed, so that the tightness between the self-adhesive layer and the adhered object is improved, and the adhesion firmness and the sealing performance of the sealing rubber strip are improved.

This invention discloses a recycled mortar concrete, its preparation method, and its application, belonging to the technical field of recycled mortar concrete. The method involves modifying activated hydrophobic aerogel powder with 3-(methacryloyloxy)propyltrimethoxysilane, then incorporating the resulting modified aerogel powder containing double bond segments into a gel system for crosslinking. Water is added for dilution, resulting in a modified liquid with a solid content of 3-4%. Recycled aggregate is impregnated with the modified liquid to obtain modified recycled aggregate. The modified recycled aggregate, silicate cement, fly ash, quartz sand, water-reducing agent, and water are mixed to obtain recycled mortar concrete. The modified recycled aggregate in the recycled mortar concrete exhibits a crosslinked network on its surface, which acts as a thickener and retarder, regulating the fluidity of the concrete. Furthermore, the hydrophobic modified aerogel powder and crosslinked network seal and strengthen the pores of the recycled aggregate, blocking moisture and improving the freeze-thaw resistance and compressive strength of the recycled mortar concrete.

This invention provides a composite nucleating agent and its application in the preparation of nylon 66 composite materials, belonging to the field of nylon 66 composite materials. The composite nucleating agent is composed of a first nucleating agent and a second nucleating agent, which synergistically regulate the crystallization behavior of nylon 66. The first nucleating agent is zinc oxide or silicon dioxide; the second nucleating agent is one or more of sodium benzoate, disodium hydrogen phosphate, zinc phenylphosphonate, and sodium stearate. The mass ratio of the second nucleating agent to the first nucleating agent ranges from 1:1 to 5:1. The composite nucleating agent of this invention, when used in the preparation of nylon 66 composite materials, can effectively improve the crystallization properties of nylon 66, achieving a good balance between low water absorption and excellent mechanical properties in nylon 66 composite materials.

The application belongs to the technical field of thermoplastic polyester imides, and particularly relates to a biphenyl-bridged thermoplastic polyester imide, a preparation method thereof, a biphenyl-bridged thermoplastic polyester imide film and application. The biphenyl-bridged thermoplastic polyester imide is polymerized from biphenyl diphenylate-3,3',4,4'-tetracarboxylic dianhydride, 3,3',4,4',-biphenyl tetracarboxylic dianhydride and 2-(4-aminobenzoate)-5-aminobiphenyl. The biphenyl-bridged thermoplastic polyester imide provided by the application has a linear thermal expansion coefficient close to that of copper foil, and excellent thermoplasticity, high-temperature dimensional stability and dielectric properties.