35results about How to "Small cell diameter" patented technology

To provide a polishing pad which is insusceptible to clogging of groove with abrasive particles and grinding dusts during polishing, and leads to little decrease in polishing rate even after long-term continuous use. A polishing pad of the present invention has a polishing layer formed of polyurethane resin foam having fine-cells, and asperity structure formed in a polishing surface of the polishing layer, and is featured in that the polyurethane resin foam is a reaction cured product between isocyanate-terminated prepolymer containing high-molecular-weight polyol component and isocyanate component, and a chain extender, and contains a silicon-based surfactant having combustion residue of not less than 8 wt %.

The present invention provides a cement foaming agent and the cement foaming agent is formed by compounding modified nano-silica and a foaming agent AC. After foaming, the cell diameter is significantly reduced while the cell density is relatively improved. The nano-silica has particular morphological characteristics so that the nanocomposite foaming agent can be dispersed more uniformly into the cement. The cement foaming agent provided by the invention achieves uniform dispersion into the cement so as to reduce the amount of local foaming, and meanwhile the composite foaming agent has the advantage of a nano-composite material.

The invention provides a preparation method of a polypropylene injection molding chemical micro-foamed composite material. The polypropylene micro-foamed composite material is prepared by uniformly mixing a polypropylene composite material and a foaming agent and molding an obtained mixture by adopting a secondary mold opening process, wherein the polypropylene composite material is prepared from the following materials in parts by weight: 57 to 63 parts of polypropylene, 0.1 to 25 parts of talcum powder, 0.1 to 20 parts of flexibilizer, 2 to 10 parts of dendritic macromolecule master batch, 0.2 to 0.4 part of antioxidant, 0.5 to 1 part of lubricating agent, and 0 to 3 parts of other additives, wherein the chemical foaming agent is sodium hydrogen carbonate master batch of LDPE carriers. Melt strength of the polypropylene composite system is mutually entangled and regulated with a matrix by virtue of the special dendritic structure of the dendritic macromolecule, after the foaming, a core layer presents in an obvious sandwiched structure, the diameter of a foam hole is 60 micrometers, and the foam holes are uniform and dense; and in addition, the heat insulation, sound insulation and noise reduction can be achieved, a novel solution is provided for developing the light-weight material, and the prepared polypropylene injection molding chemical micro-foamed composite material can be widely applied to products such as automotive interior door panels, instrument panels.

The present invention provides a deformation detection sensor which combines a magnetic resin dispersing a magnetic filler in a resin with a magnetic sensor, of which durability of long period of use is highly enhanced.

The present invention thus provides a deformation detection sensor which comprises:

• • a magnetic resin-containing polymer foam which comprises a magnetic resin, in which a magnetic filler is contained, and a polymer foam in which the magnetic resin is included, and
  • a magnetic sensor that detects a magnetic change caused by a deformation of the magnetic resin-containing polymer foam,
  • wherein an average cell diameter of cells of the polymer foam in the vicinity of an interface between the magnetic resin and the polymer foam is smaller than that of cells of a center portion of the polymer foam, and a production thereof.

The invention provides a preparation method of an anti-attenuation gasket, belonging to the technical field of sealing material preparation. The preparation method of the anti-attenuation gasket is characterized in that the anti-attenuation gasket comprises a spring steel belt and a foaming rubber layer; the foaming rubber layer is arranged on one side or two sides of the spring steel belt, and the preparation method is characterized by comprising the following steps of: carrying out surface treatment to the spring steel belt; preparing the foaming rubber; carrying out compounding, curing, checking, stamping forming and ribbing treatment on the foaming rubber and the spring steel belt sequentially so as to obtain a finished product. The foaming rubber and the spring steel belt provided bythe invention are tightly bonded, and are not easy to peel off, the product is environment-friendly, nontoxic and odorless, has a large compression amount, good rebound resilience and good flexibility, and a framework adopts the spring steel belt, so that the framework can maintain elasticity for a long time due to a honeycomb structure of the foaming rubber after being stressed, and the moment can be maintained for a long time without attenuation.

A polyol composition for a rigid polyurethane foam, which comprises polyol compounds, and water as a blowing agent, and which is mixed with a polyisocyanate component to react therewith, and thereby forming the rigid polyurethane foam, wherein the polyol compounds comprise a polyether polyol (A) which is a polymer made from an alkylene oxide and has an average functional group number of 2 to 4 and a weight-average molecular weight of 3000 to 8000, and a short glycol (B) having a molecular weight less than 250, and the water is contained in an amount of 20 to 100 parts by weight for 100 parts by weight of the polyol compounds.

The invention discloses a preparation method of an alkali-resistant fire extinguishing agent. The preparation method comprises the steps that (1) hydrophobic solid particles are put into air-drying equipment to be fully air-dried; (2) the hydrophobic solid particles are put into a ball mill to be subjected to ball milling; (3) a foaming agent, a stabilizing agent and the hydrophobic solid particles are put into a stirrer to be mixed and stirred; (4) a solute is put into clear water and mixed to form an aqueous solution, and the mixture of the foaming agent, the stabilizing agent and the hydrophobic solid particles in the step (3) is added into the aqueous solution to form the fire extinguishing agent; and (5) the obtained fire extinguishing agent is contained in a pressure-resistant container, and 1.8-2.3 atmospheric pressure is applied to the fire extinguishing agent for storage. According to the preparation method, the step of ball milling of the hydrophobic solid particles is added; the unit diameter of the hydrophobic solid particles is obviously reduced so that the hydrophobic solid particles can be attached to the surface of a burning object more uniformly; the hydrophobic solid particles are used in cooperation with foam generated by the foaming agent, and an isolation film can be rapidly formed under a high-temperature burning environment to extinguish a fire quickly.

The invention discloses a preparation method of a fire extinguishing agent made of ammonium dihydrogen phosphate dry powder, which comprises the steps of putting hydrophobic solid particles into an air-drying device for sufficient air-drying; putting the hydrophobic solid particles into a ball mill for ball milling; The step of putting the foaming agent, stabilizer, and hydrophobic solid particles into the agitator for mixing and stirring, and mixing the solute into clear water to form an aqueous solution and adding the foaming agent, stabilizer, and hydrophobic solid particles in step 3 A mixture of solid particles forms a fire extinguishing agent; the obtained fire extinguishing agent is packed in a pressure-resistant container and stored at 1.8-2.3 atmospheres. In the present invention, by adding the step of ball milling the hydrophobic solid particles, the unit diameter of the hydrophobic solid particles is significantly reduced, and can be more uniformly attached to the surface of the burning object, and the foam produced by the foaming agent can be used in a high-temperature burning environment It can quickly form an insulating film and quickly extinguish the fire.

The invention relates to a preparation method of a foaming agent master batch, which comprises the following steps: (1) adding glycerol, oxalic acid and a molecular weight regulator into a reaction kettle, and carrying out heating and dehydrating; and after dehydration is completed, adding a catalyst, and heating the reaction kettle to perform reaction for 4-10h under the conditions of vacuum andnitrogen protection so as to obtain hyperbranched polyester; (2) adding citric acid and a compatibility regulator into the hyperbranched polyester, heating the reaction kettle to perform reaction for2-4h under the conditions of vacuum and nitrogen protection to obtain a reaction product, and cooling the reaction product to obtain a citric acid-loaded hyperbranched polyester composite foaming agent; and (3) mixing matrix resin with the hyperbranched polyester composite foaming agent to a uniform state, and granulating the mixture through a granulator to obtain the foaming agent master batch. The foaming agent master batch has the characteristics of small influence on the flowability of polypropylene melt, high mechanical strength after foaming, low cost, adaptability to other fillers and assistants and the like, and has a wide application prospect in the field of large polypropylene injection molding parts.

The invention discloses a method for preparing a foam fire extinguishing agent based on an acidic solution, which comprises the steps of putting hydrophobic solid particles into air-drying equipment for sufficient air-drying; putting the hydrophobic solid particles into a ball mill for ball milling; foaming agent, stabilizer, and hydrophobic solid particles are put into a stirrer for mixing and stirring, and the solute is put into clear water and mixed to form an aqueous solution and add the foaming agent, stabilizer, and hydrophobic solid particles in step 3 The mixture is formed into a fire extinguishing agent; the obtained fire extinguishing agent is packed in a pressure-resistant container and stored at 1.8-2.3 atmospheres. In the present invention, by adding the step of ball milling the hydrophobic solid particles, the unit diameter of the hydrophobic solid particles is significantly reduced, and can be more uniformly attached to the surface of the burning object, and the foam produced by the foaming agent can be used in a high-temperature burning environment It can quickly form an insulating film and quickly extinguish the fire.

An inventive transfer roller (1) is made of a foam formed from an electrically conductive rubber composition containing an electrically conductive rubber, a crosslinking component, and a foaming agent including OBSH and 0.25 to 2.5 parts by mass of sodium hydrogen carbonate based on 1 part by mass of OBSH, and has an Asker-C hardness of not lower than 25 degrees and not higher than 35 degrees and an average foam cell diameter of not greater than 120 μm. Therefore, the transfer roller is flexible with a lower rubber hardness, and has smaller foam cell diameters. An inventive production method includes the steps of: forming the electrically conductive rubber composition into a tubular body; and maintaining the tubular body at a temperature of not lower than 120° C. and not higher than 140° C. to foam the rubber by a single-stage foaming process.

The invention discloses a preparation method of a covering type isolation fire extinguishing agent. The preparation method comprises the steps that hydrophobic solid particles are put into air-drying equipment to be fully air-dried; the hydrophobic solid particles are put into a ball grinder for ball grinding; a foaming agent, a stabilizing agent and the hydrophobic solid particles are put into a stirrer to be mixed and stirred; solutes are put into clear water to be mixed, a water solution is formed to be added into a mixture of the foaming agent, the stabilizing agent and the hydrophobic solid particles in the third step to form the fire extinguishing agent; and the obtained fire extinguishing agent is contained in a pressing resisting container, and 1.8-2.3 atmospheres of pressure are applied for storage. According to the preparation method, the step of carrying out ball grinding on the hydrophobic solid particles is added, the unit diameter of the hydrophobic solid particles is remarkably reduced, the fire extinguishing agent can be attached to the surface of a fire object more evenly, an isolation film can be fast formed under the high-temperature burning environment in cooperation with foam generated by the foaming agent, and fast fire extinguishing is achieved.