51results about How to "Fine and uniform cells" patented technology

The invention relates to an IXPE electronic radiation crosslinked polyethylene conductive foam and a preparation method thereof. The IXPE electronic radiation crosslinked polyethylene conductive foam mainly contains the mother batch: low density polyethylene; accessories: ethylene-vinyl acetate copolymer, azodicarbonamide blowing agent, polyethylene wax lubrication additive, titanate ester coupling agent and conductive carbon black which are mixed for processing, extruded for molding, radiated for crosslinking, heated for foaming, and treated by secondary processing, etc, to produce the IXPE electronic radiation crosslinked polyethylene conductive foam. The crosslinking of the product of the invention can be easily controlled, the foaming process is stable, the foam pores are fine and even, the quality of the surface is high without unpleasant odor, the foam pores are obstructed, the production can be carried out continually, the electrical conductivity is stable, the product is lightweight, non-toxic, extremely less absorbent; the thermal conductivity is slow, aging resistant, chemical corrosion resistant, pulverization resistant, and a plurality of porous foam materials can be easily achieved; in addition, the product has good properties to be treated by the secondary processing procedures, such as bonding, machining, hot forming, etc.

The invention discloses porcelainized fireproof and heat insulation foamed silicone rubber and a preparation method thereof. The rubber comprises the following raw materials in parts by weight: 100 parts of base rubber, 10 to 60 parts of porcelain forming filler, 0.1 to 0.5 part of a platinum catalyst, 0.5 to 1.5 parts of silicone oil, 2 to 10 parts of a foaming agent, 0.1 to 0.5 part of a vulcanizing agent, and 0.1 to 0.4 part of a vulcanization accelerator. The foamed silicone rubber has good ceramic effect, does not have surface cracks, is hard in texture, keeps a complete foam structure, ensures that the volume retention rate is 85% or higher, and is excellent in fireproof performance.

The invention discloses an EPE material for a crawling pad, a preparation method of the EPE material and the crawling pad. The EPE material comprises the following components in parts by mass: 90-100 parts of low density polyethylene, 5-8 parts of a silane coupling agent, 0.5-2 parts of a butane foaming agent, 40-70 parts of talcum powder, 2-5 parts of glyceride, 1-3 parts of zinc oxide and 0.5-2 parts of stearic acid. The crawling pad prepared from the EPE material is favorable in water resistance, is flexible, light and elastic, can absorb and disperse external impact force through bending to achieve a buffer effect, overcomes the defects of deformation and poor rebound resilience, and meanwhile, has a thermal insulating effect and is easy to clean.

The invention provides a pre-foamed organic silicone foam material as well as a preparation method and application thereof. The pre-foamed organic silicone foam material disclosed by the invention comprises the following raw materials: methyl and/or vinyl-terminated organopolysiloxane, hydrogen-containing polysiloxane, hydroxyl silicone oil, a pre-foaming agent, an alcohol substance, a surfactant, a filler, a catalyst and a vulcanization inhibitor. According to the pre-foamed organic silicone foam material disclosed by the invention, the pre-foaming agent and the alcohol substance are adopted for performing auxiliary foaming on the basis of dehydrogenation foaming of hydroxyl silicone oil, foaming can be performed before a dehydrogenation reaction, tiny bubble nucleuses are formed, gas volumes and foaming ratios can be effectively increased, the dosage of the hydroxyl silicone oil is reduced, thixotropy is reduced, and processability is improved. Meanwhile, by adding aids such as the surfactant, compatibility of the components can be improved, and stability in the foaming process is improved, so that the prepared foam material is fine and uniform in pore and low in density.

The invention discloses a polyurethane resin used for slow-recovery sponge, and a preparation method and an application thereof. The resin comprises a resin A component, a resin B1 component and a resin B2 component, and the resin A component comprises polyol A, a cross-linking agent, a catalyst, a foaming agent and a foam stabilizer; the resin B1 comprises 100 parts of isocyanate B1, 10-40 parts of polyol B1 and 0.002-0.010 parts of a side reaction inhibitor, the resin B2 comprises 100 parts of isocyanate B2, 50-100 parts of polyol B2 and 0.002-0.010 parts of the side reaction inhibitor, the isocyanate B1 is methyl diphenylene diisocyanate, carbodiimide modified methyl diphenylene diisocyanate, toluene diisocyanate or diisocyanatonaphthalene, the polyol B1 is polyether triol, the isocyanate B2 is methyl diphenylene diisocyanate, carbodiimide modified methyl diphenylene diisocyanate, toluene diisocyanate or diisocyanatonaphthalene, and the polyol B2 is polyether polyol. Slow-recovery polyurethane sponge with different hardness values can be produced, and the cost is low.

The invention belongs to the technical field of novel materials and relates to high temperature-resistant imide-polyvinyl chloride alloy structure foam and a preparation method thereof. The high temperature-resistant imide-polyvinyl chloride alloy structure foam comprises, by weight, 100 parts of polyvinyl chloride resin, 1-30 parts of organic dianhydride, 30-150 parts of isocyanate, 0-10 parts of a stabilizer and 1-12 parts of an initiator. The high temperature-resistant imide-polyvinyl chloride alloy structure foam has uniform foam apertures, excellent mechanical properties, closed porosity of 97% or more, density of 60kg/m<3> and compression strength of 0.8-1.2MPa. Compared with the common polyvinyl chloride structure foam, the high temperature-resistant imide-polyvinyl chloride alloy structure foam has better temperature resistance and improves a processing temperature upper limit by 30-40%. The high temperature-resistant imide-polyvinyl chloride alloy structure foam provides a strong support for use in a preimpregnation process and development of an advanced composite material technology.

The invention discloses a preparation method for a chlorinated polyvinyl chloride foaming board. The preparation method comprises the following steps of: heating chlorinated polyvinyl chloride resin, organic tin stabilizer, composite foaming agent of 4,4'-oxybis (benzenesulfonyl hydrazine)and azobisformamide, and other additives except anti-impact modifier to 80-90 DEG C, adding the anti-impact modifier and heating until 100 DEG C to 120 DEG C, cooling to 25 DEG C to 45 DEG C, granulating after discharging, delivering the particles into an extruding machine, and shaping after extrusion to obtain the chlorinated polyvinyl chloride foaming board; and the composite foaming agent is a composite of 4,4'-oxybis benzenesulfonyl hydrazine and azobisformamide, and the weight ratio of 4,4'-oxybis benzenesulfonyl hydrazine to azobisformamide is (3-1):1. The chlorinated polyvinyl chloride (CPVC) foaming bard obtained via the preparation method is provided with an expansion rate of 300 percent, and the obtained board product is provided with a remarkable mechanical force property.

The invention discloses a preparation method of a foamed nylon plate. The preparation method comprises the following steps: premixing nylon, a toughening agent, a chemical foaming agent, a nucleating agent, a lubricant and a crosslinking agent according to a formula, adding the obtained mixture into an extensional rheological plasticization and extrusion device, using an extensional deformation-based flow field to make nylon melted and plasticized and a gas formed after decomposition of the foaming agent mixed and dispersed in a polymer melt, performing extrusion through a foamed sheet die, and carrying out three-roller pressing to obtain the foamed nylon sheet. Addition of a small amount of the crosslinking agent can significantly improve the melt strength of PA, and the nylon plate produced through the preparation method by adopting the extensional rheological plasticization and extrusion device has the advantages of uniform and fine cells, high foaming rate, low aperture ratio, excellent performances, good processing performance, simple process flow, high production efficiency, suitableness for industrial scale production, and wide application prospect.

The invention provides a high-molecular foaming material and a preparation method thereof. The high-molecular foaming material is prepared from base resin, a cross-linking agent, a foaming agent, a cell nucleating agent and an antioxidant, wherein the base resin is high-molecular resin or modified high-molecular resin having end groups with active hydrogen. Based on the total weight, the content of the base resin is 93.5-97.4 wt% by weight, the content of the cross-linking agent is 0.38-1.92 wt%, the content of the foaming agent is 0.94-1.93 wt%, the content of the cell nucleating agent is 1.14-2.31 wt%, and the content of the antioxidant is 0.09-0.48 wt%. The invention also provides the preparation method of the high-molecular foaming material. The foaming system has a flame-retardant property, and the high-molecular foaming material also has better apparent mass and foaming rate.

The invention discloses a composite foaming agent for a rigid PVC foam material. The foaming agent comprises the following raw materials, by weight: 5-10 parts of azodicarbonamide, 2-4 parts of diethyl azodicarboxylate, 2-3 parts of OBSH, 0.5-1.5 parts of lauryl sodium sulfate, 1-2 parts of sodium bicarbonate, 1-2 parts of zinc carbonate, 1-3 parts of urea, 0.5-0.8 part of lead stearate, 2-4 parts of citric acid, and 15-20 parts of glycol propyl ether. According to the invention, raw materials including urea, zinc carbonate, sodium bicarbonate, sodium dodecyl sulfate are adopted for modification of azodicarbonamide to prepare the composite foaming agent for rigid PVC foam material; and the composite foaming agent has advantages of decomposition temperature within the range of molding processing of rigid PVC foam material, basically balanced heat absorption-release, smooth decomposition rate, large deflating amount and no abruptness. The rigid PVC material prepared from the composite foaming agent has good mechanical properties, uniform and fine pores, thin pore wall, easily controlled processing conditions, and no emergence of burning.

The invention discloses PVC structural foam which comprises the following raw material components in parts by weight: 100 parts of PVC resin, 5-80 parts of epoxy resin, 0.4-24 parts of an epoxy curingagent, 5-20 parts of a foaming agent, 3-20 parts of a sensitizer, 1-8 parts of a stabilizer and 5-15 parts of a processing aid. Through special setting of the raw material components and the ratio, an epoxy resin crosslinking system is introduced, and after irradiation foaming, a double-crosslinking system with two interpenetrated resin systems with a PVC resin crosslinking system is formed; on the basis of ensuring the uniformity of the PVC crosslinking system and obtaining foam with fine and uniform cells, high closed-cell rate and low water absorption, the rigidity of a crosslinking structure is enhanced by utilizing an epoxy resin system, and the crosslinking density and the crosslinking strength of the whole system are greatly improved, so that the mechanical property and the heat resistance of the prepared structural foam are greatly improved. The invention also discloses a preparation method for the PVC structural foam.

The invention relates to a variable-density ethylene propylene diene monomer thermal insulation functional material and a preparation method thereof. The thermal insulation functional material is composed of an anti-ablation functional layer, a heat-insulating layer and an easy-to-bond layer, wherein chopped fibers and a functional filler are added to the anti-ablation functional layer to improvethe ablation resistance of the anti-ablation functional layer, a foaming agent is added to the heat-insulating layer to reduce the density and enhance heat insulation, and a tackifier is added to theeasy-to-bond layer to enhance the bonding effect with a substrate material. The preparation method comprises the following steps: sequentially adding the raw materials of the anti-ablation functionallayer, the heat-insulating layer and the easy-to-bond layer into an open mill, mixing to obtain a mixed rubber sheet, then processing the obtained three layers of the mixed rubber sheets into an integral composite laminated raw rubber sheet by using a flat plate laminating pressurizing method, and carrying out integral pressurizing vulcanization forming in a using process to obtain the rubber heatinsulation layer with the multi-layer functional characteristic. The thermal insulation functional material reduces the overall average density of the material, highly resists impact of high-temperature flame, can efficiently isolate heat, has strong binding force with a substrate material, and is suitable for harsh use environments.

The invention discloses a foaming agent for PVC foamed plastic. The foaming agent consists of the following raw materials by weight: 8-12 parts of azoformamide potassium formate, 4-6 parts of p-toluenesulfonyl semicarbazide, 2-5 parts of p-(N-methoxy formamido) benzene sulfonyl hydrazide, 1-2 parts of fatty alcohol polyoxyethylene ether sodium sulfate, 2-4 parts of ammonium carbonate, 2-3 parts of ethanolamine, 1-3 parts of urea, 0.5-0.8 part of lead stearate, 3-6 parts of benzoic acid, 2-4 parts of calcium oxide and 15-20 parts of propylene glycol. The foaming agent for PVC foamed plastic provided by the invention has decomposition temperature in the molding processing range of rigid PVC foam material, basically balanced heat absorption, smooth decomposition rate, large amount of gas release and no burstiness. The foamed plastic prepared from the composite foaming agent has good mechanical property, uniform and fine bubble hole, thin hole wall, easily controllable processing conditions, and no occurrence of burning and charring.

The invention discloses a dampproof silence pad and a preparation process thereof. The preparation process comprises the following steps: mixing low density polyethylene and a hollow material and performing banburying to obtain semi-finished product particles A; mixing low density polyethylene, a foaming agent, an antioxidant and a coupling agent and performing banburying to obtain semi-finished product particles B; mixing low density polyethylene, a toughening agent and a lubricant and performing banburying to obtain semi-finished product particles C; mixing low density polyethylene and a coloring agent and performing banburying to obtain semi-finished product particles D; drying the semi-finished product particles A, B, C and D, stirring and mixing uniformly, and extruding into a sheet E by a single screw extruder; performing radiation crosslinking of the sheet E through a high-frequency high-voltage electron accelerator to obtain a foaming master slice F; preheating the master slice F by a horizontal foaming furnace, performing high-temperature foaming in a vertical foaming furnace, and sequentially performing the processes of calendering setting, corona, punching, trimming and coiling to obtain a coil of the dampproof silence pad; and performing thermal compounding between the coil G and PE films different in thickness on a compound machine with a heating device, and performing online slitting and coiling to obtain the dampproof silence pad.

The invention discloses a separable negative pressure foaming machine with a bottomless bucket, and a preparation method thereof. The separable negative pressure foaming machine comprises a stirring device, a hydraulic lifting device, a negative pressure air extraction device, a separable stirring bucket and a discharge device, wherein the separable stirring bucket comprises the bottomless bucketand a sealing cover; the hydraulic lifting device is fixedly connected with the sealing cover through an upper pull rod; the sealing cover is movably connected with the bottomless bucket through a cylinder and a lower pull rod; and the cylinder realizes the closure and separation of the sealing cover and the bottomless bucket. The separable negative pressure foaming machine disclosed by the invention overcomes the technical problems that the internal structure defects of a product are caused due to air mixing during stirring, and the inner wall of a bucket bottom cannot be self-cleaned and residues exist, so that the production efficiency is reduced, in the prior art, and the provided foaming equipment with the polyurethane bottomless bucket and a negative pressure defoaming stirring device realizes that the next foaming can be carried out without the need of cleaning for a bucket body, and continuous industrial production is efficient and rapid; and meanwhile, the foam holes of foam are fine and uniform, so that the perforation and structure defects are greatly reduced, the mechanical strength of the product is increased, and the appearance quality of the product is improved.

The invention discloses a preparation method of an intercalated and modified organic montmorillonite composite foaming agent for polyvinyl chloride. The method comprises the steps of firstly carrying out organic modification on montmorillonite by using benzyl triphenyl phosphonium chloride; secondly carrying out intercalation on the modified montmorillonite by using azodicarbonamide and achieving uniform dispersion of the azodicarbonamide between montmorillonite laminates through control of a series of technological conditions; and finally further reducing the decomposition temperature of the foaming agent through coordinating with addition of a proper amount of zinc oxide and sodium bicarbonate, adding the foaming agent to polyvinyl chloride, thereby avoiding the phenomenon of pasting of the polyvinyl chloride. Industrial control is facilitated by a synthetic process of a product produced by the process, the production cost is reduced, the foaming temperature is moderate, the product is very suitable for a foaming process of the polyvinyl chloride and is not decomposed or pasted in the foaming process, a foaming material formed by the foaming agent is stable in quality, dense and uniform in cells and excellent in heat preservation effect, and has a certain flame-retarding effect.