4results about How to "High foaming rate" patented technology

This invention discloses a high-strength, high-foaming-rate, low-viscosity oil-based polyurethane grouting material and its preparation method. The material comprises, by weight, 65-85 parts PMDI, 10-20 parts low molecular weight polyether polyol, 1-6 parts octahydroxy-POSS, 5-15 parts epoxy resin reactive diluent, 3-8 parts high-boiling-point solvent, 0.5-2.5 parts composite foaming catalyst, 1-3 parts trimer and epoxy ring-opening composite catalyst, and 1-2 parts foam stabilizer. This invention eliminates traditional volatile solvents and constructs an in-situ interpenetrating crosslinked network of "nanocage-type silsesquioxane (POSS)-epoxy resin-polyisocyanurate (PIR)". According to JC / T2041-2020 testing, this material not only has extremely low viscosity (≤400mPa·s) and extremely high non-volatile matter (≥95%), but also breaks the mechanical curse of conventional foamed materials. Under extreme foaming conditions such as rapid solidification upon contact with water (≤30s) and foaming rate ≥4000%, the compressive strength is still as high as 30MPa or more. It completely solves the global problem that high foaming of materials in leak sealing and reinforcement projects inevitably leads to low strength, and has excellent environmental protection and structural reinforcement pressure resistance.

This invention discloses a photocurable 3D printing elastic resin and a foaming method. The photocurable 3D printing elastic resin incorporates surface-modified high-temperature thermally foamed microspheres. The double bond formation and roughening of these microspheres improve the crosslinking and mechanical interlocking with the resin, thereby enhancing tensile strength. After printing, the microspheres undergo ultrasonic and vacuum pretreatment to accelerate the vaporization of liquid alkanes within the thermally foamed microspheres. Heating then allows the alkanes to escape, producing a foaming effect. This method yields elastic printed parts with high foaming rate and good uniformity, meeting the application requirements of lightweight, highly elastic, and functionally graded materials.

This invention discloses a glass fiber reinforced polypropylene material, its preparation method, and its application. The glass fiber reinforced polypropylene material comprises the following components in parts by weight: 55-95 parts polypropylene resin, 10-35 parts glass fiber, and 1-5 parts compatibilizer; wherein the polypropylene resin contains block copolymer polypropylene A and block copolymer polypropylene B in a weight ratio of (2-4):1; the average molecular weight M of block copolymer polypropylene A is... w The mass fraction of the copolymerized ethylene propylene diene monomer (EPDM) phase is 10%-20%, with a molecular weight of 200,000-290,000; the average molecular weight M of the block copolymerized polypropylene B is... w The mass fraction of the copolymerized ethylene propylene diene monomer (EPDM) phase is 11%-17% with a molecular weight ≥340,000. This invention produces glass fiber reinforced polypropylene materials by selecting block copolymers A and B with specific average molecular weights and EPDM phase contents. These materials exhibit strong tensile properties, flexural properties, and unnotched impact resistance under low-temperature conditions.

The invention relates to the field of physical foaming, in particular to C08J9 / 12. The method includes the following steps: crosslink the foaming matrix to obtain a plurality of crosslinked prefabricated products, add the crosslinked prefabricated products into a reaction reactor filled with polar liquid, add nitrogen for foaming, relieve pressure, and heat for foaming to obtain the foaming materials. In the polar liquid system, the inventor finds that the ratio of the distance between the adjacent crosslinked prefabricated products to the thickness of the prefabricated products as well as the difference between the melting temperature of the polymer and the temperature of the polar liquid need to be controlled to promote the adjacent prefabricated products in full contact with the polar liquid, and prefoaming can be carried out under the condition of low temperature difference, namely, at the low temperature of the polar liquid, to promote the foaming ratio and the cell uniformity.