30results about How to "Short foaming time" patented technology

The invention relates to a preparation method of a layered composite material, in particular to a preparation method of a foamed aluminum sandwich plate. The method comprises the following steps of: firstly, uniformly mixing an aluminum alloy, a tackifier and a foaming agent to obtain a platy or blocky foamable precast blank material; then, performing hot-pressing compounding of the precast blank and a steel plate after the surface plating to obtain a foamable composite plate sandwiching the precast blank; placing the foamable composite plate sandwiching the precast blank in a mould sleeve closed around, and delivering into an infrared foaming furnace heating at the upper and lower parts at the same time so as to heat and foam the composite plate sandwiching the precast blank under infrared radiation; and finally, pulling the mould sleeve out of the foaming furnace, and cooling to obtain a foamed aluminum sandwich plate with a fixed thickness. The foamed aluminum sandwich plate prepared by the method provided by the invention has an accurate thickness, a uniform structure and a high yield; and moreover, the preparation processes in the invention can be automatically controlled, thereby being favorable for realizing semi-continuous preparation of the foamed aluminum sandwich plate.

The invention discloses a foam magnesium alloy preparing method, belonging to the field of the production of an alloy with open or closed pores. The method is particularly a method for preparing a magnesium alloy by means of foaming a powder entity and comprises the following steps: firstly, mixing 150-270-mesh pure magnesium powder and 250-400-mesh pure aluminum powder according to a mass ratio (pure magnesium powder : pure aluminum powder) ranging from 4:1 to 9:1 so as to obtain a metal powder mixture, uniformly mixing the metal powder mixture with 200-325-mesh TiH2 powder vesicant which accounts for 1.0-2.5 percent of the mass of the metal powder mixture, carrying out cold pressing and hot pressing on the mixture obtained from the previous step, and then obtaining a magnesium alloy foaming precast block; and then, under the protection of argon, preparing the foam magnesium alloy with an average aperture ranging from 1 mm to 5 mm by means of heating the foaming precast block in a mould. The method has the advantages of simple and flexible process, short period, high productive rate and no impurity; and the foam magnesium alloy prepared according to the method has a closed-pore structure and the advantages of high porosity, uniform pore structure distribution, regular pore shapes, wide application scope and good comprehensive performance.

The invention relates to a closed pore CNTs / Al-Si composite foamed material. The closed pore CNTs / Al-Si composite foamed material comprises, by weight, 5%-25% of silicon powder, 0-5% of magnesium powder, 0.15%-1.5% of TiH2 powder and the balance CNTs / Al powder obtained through in-situ chemical vapor deposition. The preparation method includes the steps that the in-situ CNTs / Al powder is subjectedto mechanical ball milling; the CNTs / Al powder obtained through ball grinding is mixed with the silicon powder, the magnesium powder and a foaming agent in a stirring machine; the mixed powder is subjected to cold-press molding, so that a cylindrical precast block is obtained; and the precast block is put into a cylindrical steel mold of a resistance furnace for fast foaming, and accordingly the closed pore CNTs / Al-Si composite foamed material can be obtained. According to the closed pore CNTs / Al-Si composite foamed material, foam pores are evenly distributed, and the size dimensions are uniform; and full-closed holes are formed, the strain rate sensitive effect is low, and the compression stress-strain curve has an obvious platform region. The foamed aluminum material product prepared through the method is stable in quality and excellent in performance, the preparation process is simple and the technological process is fast.

The invention relates to melamine foam prepared by taking terminated isophorone diisocyanate as a curing agent. The melamine foam is made from melamine resin prepolymer by taking terminated isophoronediisocyanate as a curing agent. A liquid foaming agent is one of cyclohexane, n-heptane, and isooctane, and the foaming temperature is in a range of 80-120 DEG C. The terminated isophorone diisocyanate takes sodium bisulfite as an end-capping reagent, and has the release temperature being 80-120 DEG C. The released isophorone diisocyanate is taken as a curing agent and can obviously improve the curing rate of the melamine resin prepolymer, thereby matching the curing rate to the foaming rate in the release temperature range. The closed pore rate of melamine foam is no less than 96%, the heatconduction coefficient is lower than 0.029 W / *K, the compression strength is no less than 180 kPa, the oxygen index is no less than 36%, and the density is lower than 50 kg / m<3>.

The invention discloses a chemically foamed polyamide elastomer foam material and a preparation method thereof. The preparation method comprises the following steps: (1) extruding the mixture of polyamide elastomer, melt viscosity regulator, cell nucleating agent and foaming auxiliary agent through an extruder to obtain foamed particles; (2) foaming Granules, surfactants and chemical foaming agent are mixed in a reaction kettle, stirred and kept warm after heating up in an inert atmosphere; foaming is obtained after continuing to heat up. The polyamide elastomer foaming material provided by the invention has the advantages of good resilience, uniform cell size, low foaming material density, good foaming effect, etc., and at the same time has low melt viscosity and melt strength for polyamide elastomer , The characteristics of difficult foaming, the introduction of melt viscosity modifier to improve the viscosity and strength of the melt is conducive to foaming, suitable for popularization and use; the chemical foaming agent used has low raw material cost, short foaming time, large gas generation, and the introduction of surface activity The agent can promote foaming, control the cell diameter and cell dispersion uniformity, etc.

The present invention relates to novel types of PMMA foams and also to the production thereof. The recipes used in the production process include particularly crosslinkers and chain transfer agents as recipe constituents, mostly in low concentrations, in addition to suitable blowing agents. It was found that, surprisingly, the invention provides a simple-to-produce stable PMMA foam having very good properties.

The invention discloses a plant fiber reinforcing type heat-preservation inflaming-retarding phenolic foam material and a preparing method of the plant fiber reinforcing type heat-preservation inflaming-retarding phenolic foam material. The plant fiber reinforcing type heat-preservation inflaming-retarding phenolic foam material is formed by adding plant fibers which have different lengths and are of a hollow structure into phenolic resin. The preparing method of the plant fiber reinforcing type heat-preservation inflaming-retarding phenolic foam material comprises the steps that the dried plant fibers, obtaining through cutting, with the different lengths are mechanically mixed with the phenolic resin, an emulsifying agent, a coupling agent, a foaming agent and a curing agent, the mixture is cured and foamed for 30 min to 120 min at the curing temperature ranging from 45 DEG C to 80 DEG C, and then the plant fiber reinforcing type phenolic foam material used for internal walls and external walls of buildings is obtained after demolding. According to the plant fiber reinforcing type heat-preservation inflaming-retarding phenolic foam material and the preparing method of the plant fiber reinforcing type heat-preservation inflaming-retarding phenolic foam material, phenolic foam is reinforced through the environment-friendly and renewable natural plant fibers, the heat-preservation property and the inflaming-retarding property of the material are good, and the production cost of the phenolic foam material is greatly reduced due to the fact that the plant fibers are cheap and easy to obtain.

The invention belongs to the technical field of dyeing and finishing, and specifically relates to a soaping agent and a soaping process for high-density patterned pure cotton figured cloth. The soaping agent for high-density patterned pure cotton figured cloth is prepared from the following raw materials: N-vinyl pyrrolidone, sodium lauryl sulfate, delta-laminated sodium metasilicate, dodecyl dimethyl betaine, etidronic acid, maleic anhydride, polyacrylic acid, compound soaping enzyme, octadecyl amine ethoxylate ether, secondary alkyl sodium sulfonate and thiourea dioxide, wherein the compound soaping enzyme is composed of laccase, lipopenic enzyme, Eurolan RP soaping enzyme and EOQ soaping enzyme. The soaping agent has less foam and short foaming time when used in soaping high-density patterned pure cotton figured cloth; the soaped pure cotton figured cloth can not fade or change color; dyed fabric of the high-density patterned pure cotton figured cloth processed by the soaping agent combined with the soaping process basically has no color difference and strong loss; and compared with the traditional soaping process, the color fastness is higher, working procedures are reduced, and time and energy are saved.

Fine-cell PMMA foams are produced using a production process including nucleators in addition to suitable blowing agents. It was found that, surprisingly, a simple-to-produce stable PMMA foam having very fine cells and very good properties can be produced.