36results about How to "Low foam density" patented technology

The invention relates to a foamable polymeric composition, comprising a thermoplastic elastomer on the basis of a polyolefin and a rubber; the invention is characterized in that the polyolefin is a polypropylene homo- or copolymer having:a weight average molecular weight, Mw, of at least 2*105, andan elongational viscosity (measured at a temperature of 170° C., at a rate of elongation of 0.03 s-1 and at a time of 10 s), EV(170/10), of at least 1.4*105 Pa.s.The invention relates also to a process for foaming a polymeric composition, as well as to a foamed thermoplastic article.

There is provided herein a styrenic polymer composition comprising a styrenic polymer and a flame retardant effective amount of a mixture comprising (a) at least one brominated flame retardant; and, (b) at least one solid phosphate ester that has a melting temperature of at least 80 degrees Celsius.

A composition for polyurethane foaming, a polyurethane foam and a use thereof. The composition contains two different polyols with a polyethylene oxide ether structure and a polypropylene oxide ether structure, and a specific type of catalyst, flame retardant and water are added thereto; at the same time, the composition contains a small amount of a surfactant and other small molecular alcohols. The traits of the product are that it is pale yellow and transparent, and the product is not layered during long-term storage. The above-mentioned composition and polyphenylpolymethylene polyisocyanate (PAPI) produce a low-density polyurethane foam by means of a foaming machine. The foam has a good thermal insulation effect and a high rate of yield, and the foam has a flame retardant property, that is to say, same can be used for construction insulation, and can also be used for packaging a buffer material, has a good thermal insulation, adhesion and dimensional stability, and has a low odor during the process of construction, the foaming agents all use water, and do not contain chlorofluorocarbon substances that destroy the ozone layer and climate.

The invention relates to expandable polystyrene particles with high foaming ratio and a preparation method thereof, and particularly relates to raw materials for producing cushion packaging materials for electronics, building insulation materials and ocean floating products and a preparation method thereof. The expandable polystyrene particles with high foaming ratio are characterized by being prepared from styrene, soft water, nucleating agent, calcium phosphate, benzoyl peroxide, tert-butyl perbenzoate, white oil, a molecular chain acting force regulating agent, pentane, a surface lubricant and the like as raw materials by the steps of mixing, reacting, filtering and drying. The foam plastic prepared from the expandable polystyrene particles has low production cost; and used as a packaging material, the foam plastic is hard to break and can prevent the packed material from being damaged.

There are provided foamable, foamable polyvinyl halide resin masses containing: A) 1 to 25 parts relative to 100 parts of polyvinyl halide, of a polymerizate obtainable through the emulsion polymerization of i) up to 20 to not more than 75 parts of methylmethacrylate, ii) 25 to 80 parts of one or more C2-C18 alkylmethacrylates, iii) 0 to 5 parts of one or more vinyl unsaturated monomers copolymerizable with (i) and/or (ii, wherein the components (i)-(iii) together yield 100 parts and are polymerized with up to a further 100 parts of usual additives for emulsion polymerization, wherein the emulsion polymerizate is single stepped and has a viscosity number of >700 cm3/g and wherein copolymers are excluded which contain iv) MMA per se, or less than 20 or more than 75 parts of MMA together with either v) one or more acrylic acid esters, and/or vi) ethyl methacrylate, n-butyl-methacrylate, or ethylhexyl methacrylate. The resin mass further includes: B) 0.1-10 parts based on 100 parts of the polyvinyl halide of one or more foaming materials, C) 0-100 parts based on 100 parts polyvinyl halide of the usual additives. This polyvinyl halide resin mass, after foaming, yields a resin mass which, as well as of good surface properties, has a foam density of <0.7 g/cm3.

Described are the use of highly branched and/or dendritic polyols with a number average molecular weight (Mn) of 500 to 100,000 g/mole and preferably of 1,000 to 10,000 g/mole and an average hydroxy functionality per molecule of 10 to 1000 and preferably of 25 to 100, as polyol for the preparation of polyurethane foams with a higher ratio of compressive strength to density, a two-component foam system for the preparation of polyurethane foams with a higher ratio of compressive strength to density, with a polyisocyanates component (A) and a component (B) (polyol component) containing compounds having reactive hydrogen atoms, which are present in separate containers and, for use, can be caused to react by being mixed, which is characterized in that the polyol component (B) contains 1 to 50% by weight and preferably 2 to 30% by weight, based on the weight of the compounds of the polyol component (B) having reactive hydrogen atoms, at least one highly branched and/or dendritic polyol (B1) with a number average molecular weight (Mn) of 500 to 100,000 g/mole and preferably of 1000 to 10,000 g/mole and an average hydroxy functionality per molecule of 10 to 1000 and preferably of 25 to 100, as well as the use of this two-component foam system as installation foam, especially for the installation of door and window frames or of staircases and/or as fire protection foam for sealing openings and/or wall bushings and/or ceilings of buildings.

A highly foamed coaxial cable comprising, an inner conductor disposed in the cable, and a foamed insulator comprising porous cells and surrounding the inner conductor, and an outer conductor surrounding said insulator, and a sheath surrounding said outer conductor, and in said insulator, the total area of macro cell which has a diameter of at least 300/M is larger than the total area of micro cell which has a diameter smaller than 300/M at cross section of cable.

The invention provides sponge foaming rubber for a car door sealing strip and a preparation method thereof, a car door sealing strip and a preparation method thereof. The sponge foaming rubber for the car door sealing strip, provided by the invention, is prepared from the following components in parts by weight: 20 to 40 parts of ethylene-propylene-diene monomer 9090M, 69 to 92 parts of ethylene-propylene-diene monomer V8800, 5 to 7 parts of active zinc oxide, 1 to 2 parts of stearic acid, 1 to 3 parts of a dispersant, 0.8 to 1.4 parts of erucamide, 1 to 2 parts of PEG-4000 (Polyethylene Glycol-4000), 5 to 10 parts of POE (Polyolefin Elastomer), 60 to 77 parts of paraffin oil R-2291, 30 to 50 parts of carbon black N550, 50 to 70 parts of carbon black SP5000, 1.5 to 2.5 parts of sulfur S-80, 6 to 10 parts of a moisture absorbent GR, 3 to 6.4 parts of an accelerant, 3 to 3.6 parts of a foaming agent OBSH-75 (Oxydibenzenesulfonyl Hydrazide-75) and 1.1 to 1.5 parts of a foaming agent AC3000-75. By adopting a formula of the sponge foaming rubber for the car door sealing strip, provided by the invention, the prepared sponge rubber has relatively low density and can meet a lightweight design; meanwhile, the obtained rubber also can have relatively good physical performance, so that the utilization quality of the car door sealing strip utilizing the sponge foaming rubber can also be improved.

Polymer foam and a method for preparing the same are disclosed. In the present disclosure, the method sequentially comprises the following steps: providing a polymer body; performing a pressure-induced flow (PIF) process on the polymer body at a first predetermined temperature and a first predetermined pressure for a pressure holding time, to obtain a polymer sheet; and performing a foaming process on the polymer sheet by using a foaming agent at a second predetermined temperature and a second predetermined pressure for a saturation time, to obtain polymer foam.

The invention discloses a preparation method of a light-weight wall board and a multilayer light weight wall board, and relates to the technical field of a building material. The preparation method ofthe light-weight wall board uses a multi-time material distribution mode; a first material and a second material are respectively subjected to material distribution and firing, wherein each of the first material and the second material comprises a base material and a foaming agent; the amount of the foaming agent in the first material is 0.1 to 0.2 percent; the amount of the foaming agent in thesecond material is 0.25 to 0.35 percent. Preferably, the material distribution times is 2 to 3 times. The multilayer light-weight wall board is prepared by the preparation method of the light-weight wall plate. The preparation method has the advantage that the sound isolation, heat isolation and mechanical performance of the finally formed multilayer light-weight wall board are improved.

The invention relates to high molecular processing modifier used in a polyvinyl chloride low foaming tube, which is characterized in that: the total weight of polymeric monomer is calculated as 100 percent, which comprises 12-72 percent of methyl methacrylate, 21-66 percent of styrene and 7-22 percent of acrylonitrile. Chain extender is added into the compositions to carry out emulsion polymerization in redox system. The invention is characterized in that: the invention can improve plasticizing and the plasticizing can become more even, can improve melt strength to promote extending property, can improve surface quality to reduce melting pulsation and increase surface gloss and can improve processing property to reduce blooming and crazing, decrease the foaming density of the product and increase elongation and pulling speed. Because of higher relative molecular mass, the invention can greatly improve the melt strength. The invention is used for producing PVC foaming products which have dense and even stomata structure and lower density.

A vehicle external mirror assembly (10) comprising a mirror head (30) adapted to support a mirror, the mirror head (30) having an external shell (36), a first foam core (37) providing support for the shell (36), a mirror base (20) adapted for mounting to a vehicle, the mirror base (20) connected to the mirror head (30) or integral with the mirror head (30) and a plurality of electrical conductors (32) disposed within the first foam core (37), the conductors (32) are arranged and constructed to diffuse stress within the foam core (37).

The invention provides high-weight high-strength phenol formaldehyde foam and a preparation method thereof. The foam is mainly prepared from the following raw materials in parts by weight: 100 parts of high-viscosity phenolic resin, 4 to 6 parts of silica sol, 3 to 5 parts of pH regulators, 2 to 4 parts of potassium silicate, 7 to 10 parts of foaming agents, 5 to 10 parts of emulsifiers and 10 to 16 parts of curing agents. The preparation method of the foam has the advantages that nanometer silicon dioxide particles are introduced into formaldehyde foam by using silica sol/potassium silicate; Si-O-C chemical bonds are generated by using the effects of nanometer silicon dioxide and high-viscosity phenolic resin; an interface enhancing effect is generated. Concretely, in a container with a stirring function, the raw materials are added according to the proportion ratio; after the materials are uniformly stirred, the materials are fast poured into a mold; foaming is performed at 65 to 70 DEG C; the heat insulation is performed for 20 to 30 min; demoulding is performed. The mechanical intensity is improved; the production cost is reduced; the heat resistance is improved; the operation is simple; the method is suitable for industrialized operation.

The invention discloses a sponge sofa or sponge stool structure which comprises a low-density sponge foaming forming sofa base or low-density sponge foaming forming stool base with the foaming density of 10-35 kg/m<3>, wherein a high-density sponge cladding layer with the foaming density of 35-60 kg/m<3> is integrally foamed on the outer surface of the base; the hardness of the sponge sofa base or the sponge stool base is Share A 20+; the hardness of the sponge cladding layer is 30-80 Kgf. The sponge sofa structure has the characteristics of simple manufacturing process, shape controllability, high production efficiency and low manufacturing cost. In addition, a low-density sponge of the sponge sofa base or the sponge stool base is relatively low in price and light in weight and has certain supporting strength and supporting toughness. Therefore, the consumption of a high-density sponge can be reduced, and the material cost and weight of a whole sponge sofa or stool can be further reduced. Moreover, the sponge cladding layer is integrally foamed on the outer surface of the sponge sofa base or the sponge stool base, is firmly attached to the surface of the base and is unlikely to loosen, and thus the service life of the sponge sofa or stool is guaranteed.

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 freezer foaming layer, and relates to the technical field of freezer manufacturing. The freezer foaming layer is prepared from a high-viscosity black material, combined polyether and a foaming agent through a reaction. The viscosity of the high-viscosity black material at 25 DEG C is 300 to 700 mPa.s; wherein the high-viscosity black material is a mixture consisting of isocyanate with higher functionality and diphenylmethane diisocyanate. The flowability of the foaming liquid is improved through the combined polyether, so that the problem of insufficient foam flowability caused by the use of a high-viscosity black material is solved; the prepared polyurethane foam has the effects of zero ODP value and low GWP value; besides, the prepared foam is low in foaming density, the using amount of foaming materials is reduced, the foaming cost is reduced, the heat conductivity coefficient of the foam is low, and it is guaranteed that the heat preservation performance of the foam is not affected.