207 results about "Phenolformaldehyde foam" patented technology

The invention discloses a foaming phenolic resin preparation method. The method comprises the following steps: A, phenol, aldehyde and alkali catalyst are added into a reactor, the mole ratio is 1 : 1-3 : 0.01-0.1, and the components are stirred for 5 to 8 hours at 70 to 90 degrees centigrade; B, the temperature of reaction liquid in step A is reduced to 50 to 60 degrees centigrade, acid is added and stirred until the pH value is 6.0 to 8.0; and C, the reaction liquid in step B is decompressed and dehydrated to 60 to 70 degrees centigrade and 2500 to 7000 m Pa.s viscosity. The invention further discloses phenolic resin foam made of the phenolic resin. The invention makes the foaming phenolic resin which can gel quickly have low free monomer content and high curing activity through controlling the synthesis technology condition accurately. The aperture of the prepared phenolic foam body is only 50 to 60 microns. The structure of the micro holes of the foam body is regular and the foam holes are fine and compact. The prepared phenolic foam body does not need any toughening modifier and no residue falls.

The invention provides a preparation method of phenolic foam boards. The method comprises the steps as follows: mixing 90 to 120 parts by weight of alkaline phenolic resin, 4 to 15 parts by weight of foaming agents, 2 to 6 parts by weight of emulsifiers, 2 to 8 parts by weight of flexibilizers and 10 to 30 parts by weight of curing agents so as to prepare a foaming system of the phenolic foam boards; heating for foaming; solidifying for shaping; and then post-solidifying so as to prepare the phenolic foam boards. The post-solidifying treatment is performed on the conditions that temperature is 30 to 80 DEG C, the humidity is 40 to 90%, and the time is 24 to 72 hours. The preparation method provided by the invention is realized by post-solidifying boards, and adding an inorganic fire retardant and a high-activity modifier to the foaming system of the phenolic foam boards so as to prepare phenolic foam boards with the warping dimension being equal to or less than 4 mm, the wall-mounting condition is good or the boards are warped slightly, and no dropping phenomenon occurs; therefore, the boards accord with the requirements for good boards in the markets, and the method solves the warping problem of the phenolic foam boards.

The invention relates to a preparation method of lignin modified phenolic foam, comprising the following steps: modifying high molecular weight lignin in order to degrade into low molecular weight lignin, wherein the activity is improved, replacing the phenol by the degraded lignin, preparing lignin modified resol, mixing with curing agent, foaming agent and surfactant, foaming at room temperature (25-30 DEG C) or in an oven of temperature 40-80 DEG C, finally the modified phenolic foam plastic is obtained after the curing process. The preparation method of the invention has the following advantages: the cost of the phenolic foam is greatly reduced, the toughness of the foam is increased and the brittles is decreased, thus the foam of the lignin modified phenolic foam has good market prospect; the preparation method of the invention provides a high-addition way to the abundant pulp paper-making waste liquid and forestry and agricultural residues, and reduces the dependency of phenolic foam industry on petrochemical raw material phenol.

The invention relates to a preparation method of polyurethane-prepolymer-toughened modified phenolic foam plastic, which comprises the following steps: vacuumizing and dehydrating polyalcohol, dropwisely adding the polyalcohol into isocyanate to react in a nitrogen atmosphere, and adding a chain extender to react; regulating an alkaline A-stage phenol formaldehyde resin with acid according to parts by mass, adding a toughener polyurethane prepolymer, a surfactant, a foaming agent 1 and a curing agent into the resin to obtain a foamed system; and stirring uniformly the foamed system at room temperature, and heating to cure and form to obtain the polyurethane-prepolymer-modified flame-retardant phenol formaldehyde foam thermal-insulation material. The phenol formaldehyde foam has the advantages of less shedding, high toughness and the like; and the adopted phenol formaldehyde resin has the advantages of low viscosity and favorable compatibility with the polyurethane prepolymer, and can be easily mixed uniformly.

The invention relates to a wood fiber reinforced flame retardant foam composite plate and a preparation method thereof. The external layer of the composite plate is a wood panel, and the foam core plate in the internal layer is a wood fiber reinforced phenol formaldehyde foam material or a melamine modified formaldehyde foam material. The wood fiber is treated by a coupling agent. The invention further relates to a manufacturing method of the plate. The wood panel is adhered to the external layer panel of the foam core plate. The plate can be manufactured by performing lamination thermal composition on the materials by using an adhesive, and also can be manufactured by directly foaming between fixed dual-layer panels. The foam core plate uses wood fiber reinforced phenol formaldehyde foam or melamine modified formaldehyde foam material. The flame retardant performance can accord with the specified standard. The foam core plate is flame retardant and small in smoke amount, generates no harmful gas, and meets requirement of environmental friendliness, so that the composite plate has excellent sound absorption and heat insulation properties. The fiber reinforced foam base material has an excellent mechanical property.

The invention relates to a modification method of lignin. The modification method comprises: adding and dissolving lignin in an organic solvent in which a thiol and a basic catalyst are dissolved, carrying out a demethylation reaction, centrifuging, washing and drying to obtain pure demethylated lignin, wherein the mass ratio of lignin to the catalyst to the thiol to dimethyl formamide is 1: (0.2-0.6): (0.5-2): (5-10). The lignin provided by the invention has the advantages that the free radicals are not polymerized in the modification process, the molecular weight of the lignin is reduced and the polarity is simultaneously improved, the reaction activity with formaldehyde is improved, and the lignin can replace phenol at a high ratio. The lignin modified by the modification method is in a shape of powder, can be used for preparing thermoplastic phenolic resins and thermosetting phenolic resins, and can also be used for adhesives, phenolic foam plastics, polyurethane foam plastics, phenolic molding materials, carbonization functional materials, polyurethane films and other multiple novel polymer materials.

A composite phenolic aldehyde construction energy saving insulation plate and manufacturing method and application thereof relate to an insulation plate. The invention aims to provide the composite phenolic aldehyde construction energy saving insulation plate and the manufacturing method and application thereof with excellent insulation effect, convenient use and high construction efficiency. The invention comprises a phenolic aldehyde insulation layer, a bonding layer and an inorganic material composite board, wherein, the bonding layer is arranged between the phenolic aldehyde insulation layer and the inorganic material composite board; the thickness of the phenolic aldehyde insulation layer is 20-100mm, the thickness of the bonding layer is 0.1-1mm, and the thickness of the inorganic material composite board is 3-10mm. The inorganic material composite board is continuously produced for reserving; the inorganic material composite board is applied with bonding treatment agent; phenolic aldehyde resin which is prepared pro rata is frothed and solidified into shaping with the continuous production line of the composite board, and a target product can be received.

The invention specifically relates to a preparation method for halogen-free flame-retardant toughened phenolic foamed plastics, which belongs to the technical field of materials. The method comprises the following steps: weighing 100 parts of resol resin and then respectively adding a plasticizer, a surfactant, a curing agent, a foaming agent and a halogen-free flame retardant; and evenly mixing the above mentioned components under rapid stirring, pouring an obtained mixture into a die, closing the die and carrying out foaming at a temperature of 60 to 100 DEG C for 30 to 60 min so as to obtain the flame-retardant toughened phenolic foamed plastics. The prepared flame-retardant toughened phenolic foamed plastics have the advantages of a good flame retardant effect (wherein an oxygen index is as high as 40%), a small smoke volume in combustion, no production of toxic and corrosive gas and good mechanical properties.

The invention discloses a preparation method of a hollow glass microbead-reinforced phenolic foam composite material, belonging to the field of foam materials. The preparation method comprises the following steps: copolymerizing phenol and formaldehyde serving as comonomers and hollow glass microbeads serving as reinforcing materials so as to get modified A-stage phenolic resin in the presence of an alkaline catalyst; and further mixing the A-stage phenolic resin with a surfactant, a foaming agent, a nano-nucleating agent and an acid curing agent according to a formula, adding into a mold, and performing hot-pressing, foaming and molding to prepare the hollow glass microbead-reinforced phenolic foam. According to the preparation method disclosed by the invention, by reinforcing the hollow glass microbeads, the compressive strength, the bending strength and the impact strength of the phenolic foam are improved; the bubble hole structure of the phenolic foam is improved, the bubble hole size is reduced; and bubble holes are more uniform; and the fire resistance of the phenolic foam can not be reduced. The prepared foam can be applied to high-tech technical fields of aerospace, high-speed trains, building heat insulation, ships and the like.

A steel face type phenolic aldehyde heat preservation composite board and the manufacturing method and application thereof relate to a warming plate, particularly a steel face type phenolic aldehyde heat preservation composite board and the manufacturing method and application thereof, which combines the advantages of the traditional galvanized sheet iron wind pipe and combined wind pipe, have good heat preservation effect, widely used in the pipe of the central air conditioner, such as the heat preservation work shop, the clean air condition house, the large exhibition hall, the gymnasium, the high-rise building, the high level villa, which are provided with an upper layer, a tackified layer, the phenol formaldehyde foam insulation layer and the metal lower layer. The tackified layer is arranged between the upper layer and the phenol formaldehyde foam insulation layer, the thickness of the upper layer is 0.1-0.5 mm, the thickness of the phenol formaldehyde foam insulation layer is 20-100mm, the thickness of the metal lower layer is 0.05-0.5 mm. The continuous production method or the batch production method is used.

The invention discloses a method for preparing safe environment-friendly phenolic foam. The foam is prepared by a reaction after mixing the following ingredients: 100 weight portions of expandable phenolic resin, 8-15 weight portions of curing agent, 4-8 weight portions of surfactant and 20-50 weight portions of packing. The preparation method comprises the following steps: putting the ingredients in a reaction container in proportion, stirring with high speed, after mixing uniformly, transferring the ingredients to a preheated mould, foaming at the temperature of 60-80 DEG C and under the pressure of 15-40kg/cm<2>, cooling and demoulding. According to the method, because inflammable CFCs, low-carbon alkane and other lower-boiling organic compounds are not used as foaming agent, the production cost is reduced. The prepared phenolic foam has uniform quality, small aperture, low coefficient of thermal conductivity, and good thermal insulation performance, can be widely used in exterior wall, roofing, air-conditioning bellow and other thermal insulation materials, and improves thermal insulation performance and fireproof performance greatly.

A water-soluble phenolic resin for continuous casing and foaming at ordinary temp is composed of phenol and formaldehyde through low-temp prepolycondensation reaction, heating to 95 deg.c, high-temp polycondensation reaction, medium-temp polycondensation reaction, and low-temp polycondensation reaction while adding amino organosilicon compound as reaction activity regulator. Its advantages are high foaming uniformity, and high adhesion to panel.

The invention relates to lignin phenolic foam and a preparation method thereof. The preparation method comprises the following step: liquefying lignin to obtain biomass phenol to obtain lignin flowing phenolic resin under the catalyst effect of formaldehyde. The lignin phenolic foam is prepared from the following components in parts by mass: 100 parts of lignin flowing phenolic resin, 4-8 parts of a surfactant, 10-32 parts of a curing agent and 5-20 parts of a foamer. According to the lignin phenolic foam provided by the invention, dependency of phenolic resin on petrochemical materials is reduced, and the foam is uniformly foamed, has good heat-preserving and fire resisting performances and biodegradability, belongs to an environment-friendly product, and has huge social, economic and biological benefits.

The invention belongs to the technical field of materials, and relates to a preparation method of borate modified phenolic foam material. The borate is prepared by esterification reaction of boric acid and polyethylene glycol under certain temperature. The preparation method of the borate modified phenolic foam material comprises the following steps of: firstly, weighing 100 mass parts of A-stage phenolic resin, then, respectively adding 2-14 mass parts of borate, 3-6 mass parts of surface active agent, 8-11 mass parts of curing agent and 6-14 parts of foaming agent, stirring and mixing evenly, pouring the mixture into a die, closing the die, foaming for 30-60min under 70-90 DEG C, and sequentially obtaining the borate modified phenolic foam. The phenolic foam material is high in flame retardant efficiency, low in powdery rate and low in smoke development, and generates no toxic and corrosive gases.

The invention relates to a toughened enhanced phenolic foam insulation material. The material is characterized by mainly comprising the following raw materials: 100 parts of phenolic resin, 2-10 parts of phenolic resin fluidity improver, 5-15 parts of emulsifying agent, 4-8 parts of foaming agent, 1-10 parts of toughening-enhancing agent, and 6-55 parts of reactivity acid curing agent. The reactivity acid curing agent in high additive amount is adopted so that the cost is lowered, and the system residual acid is small and the corrosivity is small. The glass fiber powder and diatomite are used as the toughening-enhancing agent so that the foam flame retardation is improved, and the production cost is lowered.

The invention discloses a toughened modified phenolic resin foam material, the foaming material comprises the following components by weight: 100 parts of modified phenolic resin, 2-10 parts of a surface active agent, 4-12 parts of a foaming agent, 1-12 parts of a modifying agent and 2-10 parts of a curing agent, and the modified phenolic resin comprises nonyl phenol type phenolic resin and phenol type phenolic resin. The invention also discloses a preparation method of the toughened modified phenolic resin foam material. The toughened modified phenolic resin foam material effectively improves the toughness of phenolic foam by combination of changes in the internal structure and the addition of the modifying agent, the excellent flame retardant performance of the toughened modified phenolic resin foam material is not affected, the problem of incapability of concurrent consideration to toughness and flame retardancy of the phenolic foam can be solved, and application areas of the toughened modified phenolic resin foam material as a heat insulation fire retardant material can be broadened.

The invention discloses a toughening-modified phenol formaldehyde foam which is mainly prepared from the following raw materials in parts by mass: 40-80 parts of toughening-modified phenol formaldehyde resin, 2-4 parts of surfactant water-based silicon oil, 3-6 parts of composite foaming agent and 4-8 parts of acid mixture curing agent. The sulfuric acid, phosphoric acid, boric acid, methylsulfonic acid, dodecylbenzene sulfonic acid, camphorsulfonic acid and the like are proportionally mixed to obtain the inorganic-organic acid mixture used as the curing agent, the curing rate and foaming rate are proper, and the system is heated gradually, thereby ensuring the reaction uniformity; and the prepared phenol formaldehyde foam has the advantages of uniform and fine foam pores and light color.

The invention provides a phenolic resin and polyurethane prepolymer composite foam material and a preparation method. The composite foam material comprises phenolic resin, a polyurethane prepolymer, hole-closed perlite, a surfactant, a foaming agent and a curing agent with the mass ratio of 1:(0.05-0.25):(0.10-0.30):(0.02-0.06):(0.05-0.15):(0.80-0.15); the preparation method comprises the following steps: mixing phenolic resin, the polyurethane prepolymer and various auxiliaries, stirring, then mixing the mixture with the hole-closed perlite, feeding the new mixture into a mould, foaming, curing and carrying out curing forming. The material is light in mass and good in toughness; compared with phenolic foam which does not contain polyurethane, the pulverization rate is reduced by 50%-70%; the heat conductivity coefficient reaches 0.030 W/m.K; the oxygen index reaches 46.5 and the combustion performance reaches the A level. The material is excellent in performance, and the cost is reduced by 20%-30%. The material can be used as a heat-insulation sound-insulation and cold insulation material.