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

Process for preparing a flexible polyurethane foam comprising reacting at an isocyanate index of 70 to 130, 1) 40-65 parts by weight of a polyisocyanate composition comprising a) 80-100% by weight of a diphenylmethane diisocyanate component comprising, based on 100 parts by weight of the diphenylmethane diisocyanate component, i) 75-100 parts by weight of diphenylmethane diisocyanate comprising 15-75 parts by weight of 4,4′-diphenylmethane diisocyanate, and 25 to 85 parts by weight of 2,4′-diphenylmethane diisocyanate, and 2,2′-diphenylmethane diisocyanate and / or a liquid variant of such diphenylmethane diisocyanate, and ii) 0 to 25 parts by weight of homologues of diphenylmethane diisocyanates having an isocyanate functionality of 3 or more; and b) 20-0% by weight of toluene diisocyanate; 2) 20 to 45 parts by weight of a polyether polyol having an average molecular weight of 4500-10000, an average nominal functionality of 2-6 and comprising oxypropylene and optionally oxyethylene groups, the amount of oxypropylene groups being at least 70% by weight calculated on the weight of this polyol; 3) 3 to 20 parts by weight of a polyether polyol having an average molecular weight of 700-4000, an average nominal functionality of 2-6 and an hydroxyl value of at most 225 mg KOH / g and comprising oxyethylene and optionally oxypropylene groups, the amount of oxyethylene groups being at least 70% by weight calculated on the weight of this polyol; and 4) 2-6 parts by weight of water, wherein the amount of the polyisocyanate composition, polyol 2), polyol 3), and water being 100 parts by weight.

The invention provides a polybutylene foam material and a preparing method thereof. According to the foam material, by means of a chemical foaming method, an extruder is used for carrying out extruding foaming, an injection molding machine is used for carrying out injection molding foaming, and a double-roller mixing mill is used for carrying out mould pressing foaming after blending. The situation that melt indexes and melt strength corresponding to polybutylene of different and identical contents are different is taken into consideration, and the influence on the foaming behavior from polybutylene of the different and identical contents is explored. The influence on the cellular structure and mechanical properties of the foam material from different addition quantities of foaming agents is studied. The influence on the polybutylene cross-linking degree and the material melt strength from different addition quantities of cross-linking agents is studied, so that the foam material with cells distributed uniformly and good mechanical properties is obtained. In addition, different kinds of nucleating agents and the addition quantity of the different nucleating agents are considered according to the classic nucleating theory, and a balance point is found between the cellular structure and the mechanical properties of the foam material. The foam material can be applied to automotive upholstery parts, food packages, biological medicine materials and pipe heat insulation and heat preservation cannulas.

The invention provides a chassis structure used for a refrigerated container, comprising two vertically-arranged bottom side beams, a plurality of main bottom cross beams which are arranged to be vertical to the bottom side beams and a corrugated sub floor which is connected with the bottom side beams and the main bottom cross beams. Two ends of the main bottom cross beam are welded onto the bottom side beams and the corrugated sub follow is arranged on the main bottom cross beams. The invention is characterized in that the structure also comprises a plurality of small bottom cross beams and each small bottom cross beam is arranged between the trough of the corrugated sub floor and a T floor inside the container and two ends of the small bottom cross beam are also vertically welded onto the bottom side beams. The invention also provides a refrigerated container adopting the chassis structure. For the chassis structure of the invention, the weight of goods inside the container is mainly borne by the main bottom cross beams and the small bottom cross beams so as to reduce the bearing strength of the corrugated sub floor and enhance the rigidity and strength of the chassis of the refrigerated container, and simultaneously to reduce the corrugated sub floor materials and corrugated height and the foam density of a foam layer so as to reduce the consumption of structure materials and foam material and reduce the heat-leakage rate.

The invention relates to a flame-retardant styrene polymer foam plastics, which comprises styrene polymer and flame-retardant agent compound. The weight of phosphorus-containing compound takes up 2 percent to 4 percent of the total weight of the styrene polymer. The weight of HBCD takes up at least 5 percent to 8 percent of the total weight of the styrene polymer. The weight of antimony oxide compound takes up at least 2 percent of the total weight of the styrene polymer; the weight of expansion flame-retardant compound takes up at least 6 percent to 12 percent of the total weight of the styrene polymer. The invention, by recycling the styrene polymer foam plastics and through the extrusion production technique of common styrene polymer foam plastics, gets the styrene polymer foam plastics with good flame-retardant performance (the flame-retardant performance meets the requirement on heat insulation foam plastics of GB8624). The extruded type flame-retardant styrene polymer foam plastics the invention gets has low coefficient of thermal conductivity ( high energy saving efficiency), high intensity, and the flame retardance which can meet the requirement of national building fireproof standard, replaces molded type styrene polymer foam plastics and has good prospect on building insulation and pipe sandwich heat thermal insulation, etc.

The invention discloses reduced density foams and methods of making the foams by applying or creating a nonfoaming barrier layer on a foamable layer, which barrier layer inhibits the escape of fugitive gases during the foaming process.

A highly foamed coaxial cable having an inner conductor disposed in the cable, a foamed insulator having porous cells surrounding the inner conductor, an outer conductor surrounding the insulator, and a sheath surrounding the outer conductor and the insulator, wherein 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.

A foam material having one glass transition temperature (Tg) and made from an immiscible composition having at least two glass transition temperatures (Tg) by an extrusion process wherein said composition (C) comprises at least one polyarylene (P1) polymer, wherein more than 50% by moles (moles %) of the recurring units of said (P1) polymer are recurring units (R1) consisting of an arylene group, wherein said arylene group is a hydrocarbon divalent group consisting of one core composed of one benzene ring or of a plurality of benzene rings fused together by sharing two or more neighboring ring carbon atoms, said benzene ring being optionally substituted, wherein each of said arylene group is bound to two other arylene groups of neighboring recurring units (R1) through a first C—C bond (E1) and a second C—C bond (E2), wherein at least 20 moles % of recurring units (R1) are kink-forming arylene units (R1-b), the remainder being rigid rod-forming arylene units (R1-a) different from aryleneR1<sub2>—< / sub2>b units, wherein in said aryleneR1<sub2>—< / sub2>a units the bond (E1) and the bond (E2) are co-linear and anti-parallel towards each other, said (P1) polymer being present in composition (C) in an amount of below 75% by weight (wt. %) and above 10 wt. % based on the total wt. % of (P1) polymer and (PPSU) polymer, and (ii) at least one polyphenylsulfone polymer, said (PPSU) polymer being present in composition (C) in an amount of below 90 wt. % and above 25 wt. % of based on the total wt. % of polyarylene (P4) polymer and (PPSU) polymer.

A method for producing a bedding product is disclosed which has at least a foamed latex layer. The method includes pouring liquid latex foam on a conveyor belt. The liquid latex foam is vulcanized in a vulcanization station to obtain a vulcanized latex foam slab. The vulcanized latex foam slab is cut to a desired length and / or width. Electromagnetic waves with a frequency ranging between 1 and 50 Mhz are used for at least partially vulcanizing the liquid latex foam.

The invention discloses a preparation method of a light-weight wallboard and a multilayer light-weight wallboard, and relates to the technical field of building materials. The preparation method of the light-weight wallboard adopts the method of distributing the first batch and the second batch separately, and then fires them; wherein, both the first batch and the second batch include a base material and a foaming agent, The amount of the foaming agent in the first batch is 0.1%-0.2%, and the amount of the foaming agent in the second batch is 0.25-0.35%; preferably, the number of times of distributing is 2-3 times. The multi-layer light wallboard is prepared by applying the above-mentioned preparation method of the light wallboard. The preparation method of the invention improves the sound insulation, heat insulation and mechanical properties of the finally formed multi-layer lightweight wallboard.

The invention provides a chassis structure used for a refrigerated container, comprising two vertically-arranged bottom side beams, a plurality of main bottom cross beams which are arranged to be vertical to the bottom side beams and a corrugated sub floor which is connected with the bottom side beams and the main bottom cross beams. Two ends of the main bottom cross beam are welded onto the bottom side beams and the corrugated sub follow is arranged on the main bottom cross beams. The invention is characterized in that the structure also comprises a plurality of small bottom cross beams and each small bottom cross beam is arranged between the trough of the corrugated sub floor and a T floor inside the container and two ends of the small bottom cross beam are also vertically welded onto the bottom side beams. The invention also provides a refrigerated container adopting the chassis structure. For the chassis structure of the invention, the weight of goods inside the container is mainly borne by the main bottom cross beams and the small bottom cross beams so as to reduce the bearing strength of the corrugated sub floor and enhance the rigidity and strength of the chassis of the refrigerated container, and simultaneously to reduce the corrugated sub floor materials and corrugated height and the foam density of a foam layer so as to reduce the consumption of structure materials and foam material and reduce the heat-leakage rate.

A method for producing a bedding product comprising at least a foamed latex layer, said method comprising the steps of: —pouring liquid latex foam on a conveyor belt; —vulcanizing said liquid latex foam in a vulcanization station to obtain u vulcanized latex foam slab; —cutting said vulcanized latex foam slab to a desired length and / or width, characterized in that for at least partially vulcanizing said liquid latex foam electromagnetic waves with a frequency ranging between 1 and 50 Mhz are used.

The present invention is related to expandable vinyl aromatic polymers comprising from 1 to 10% by weight of homogeneously dispersed coke particles having a volume median particle diameter (D50) comprised between 0.5 and 8.5 μm and from 0.1 to 5% by weight of a halogenated block copolymer. The invention further is related to a method for producing said expandable vinyl aromatic polymers and to the expanded foams.

A foam material having one glass transition temperature (Tg) and made from an immiscible composition having at least two glass transition temperatures (Tg) by an extrusion process wherein said composition (C) comprises at least one polyarylene (P1) polymer, wherein more than 50% by moles (moles %) of the recurring units of said (P1) polymer are recurring units (R1) consisting of an arylene group, wherein said arylene group is a hydrocarbon divalent group consisting of one core composed of one benzene ring or of a plurality of benzene rings fused together by sharing two or more neighboring ring carbon atoms, said benzene ring being optionally substituted, wherein each of said arylene group is bound to two other arylene groups of neighboring recurring units (R1) through a first C—C bond (E1) and a second C—C bond (E2), wherein at least 20 moles % of recurring units (R1) are kink-forming arylene units (R1-b), the remainder being rigid rod-forming arylene units (R1-a) different from aryleneR1_b units, wherein in said aryleneR1_a units the bond (E1) and the bond (E2) are co-linear and anti-parallel towards each other, said (P1) polymer being present in composition (C) in an amount of below 75% by weight (wt. %) and above 10 wt. % based on the total wt. % of (P1) polymer and (PPSU) polymer, and (ii) at least one polyphenylsulfone polymer, said (PPSU) polymer being present in composition (C) in an amount of below 90 wt. % and above 25 wt. % of based on the total wt. % of polyarylene (P4) polymer and (PPSU) polymer.

The invention provides a polybutylene foam material and a preparing method thereof. According to the foam material, by means of a chemical foaming method, an extruder is used for carrying out extruding foaming, an injection molding machine is used for carrying out injection molding foaming, and a double-roller mixing mill is used for carrying out mould pressing foaming after blending. The situation that melt indexes and melt strength corresponding to polybutylene of different and identical contents are different is taken into consideration, and the influence on the foaming behavior from polybutylene of the different and identical contents is explored. The influence on the cellular structure and mechanical properties of the foam material from different addition quantities of foaming agents is studied. The influence on the polybutylene cross-linking degree and the material melt strength from different addition quantities of cross-linking agents is studied, so that the foam material with cells distributed uniformly and good mechanical properties is obtained. In addition, different kinds of nucleating agents and the addition quantity of the different nucleating agents are considered according to the classic nucleating theory, and a balance point is found between the cellular structure and the mechanical properties of the foam material. The foam material can be applied to automotive upholstery parts, food packages, biological medicine materials and pipe heat insulation and heat preservation cannulas.