188 results about "Polyphenyl isocyanate" patented technology

The invention relates to a preparation method of a polyurethane prepolymer, which comprises: mixing polyisocyanate and an organic polyol compound for reaction, wherein the molar ratio of the -NCO in the polyisocyanate and the -OH in the organic polyol compound is (4-15):1; the polyisocyanate is two or more of polymethylene polyphenyl isocyanate (PAPI), methylene diphenyl diisocyanate (MDI) and carbodiimide modified MDI 5412; and the organic polyol compound comprises one or more of polyether glycol with functionality of 2 to 4 and number-average molecular weight of 300 to 5,000, polyester polyol and polyether-polyester polyol. The invention also relates to the polyurethane prepolymer and a polyurethane grouting material. The polyurethane grouting material is a single-component grouting material, has little toxicity to the environment and construction personnel and can well improve foaming rate and anti-contraction performance; during packaging, the need of independent packaging of a catalyst is obviated, so the packaging cost is lowered; and the material is more convenient to use and transport and has a more wide application range and a bright prospect.

The invention relates to a polyurethane reinforcing and filling materials for coal mines. A component A is a polymethylene polyphenyl isocyanate, a component B is obtained via the follow steps: mixing and stirring the following ingredients: 33 to 70 wt% of polyether polyol, 0 to 40 wt% of polyester polyol, 0.1 to 1.5 wt% of composite catalyst, 6 to 30 wt% of composite flame retardant, 0 to 15 wt%of foaming agent, 0.5 to 2.5 wt% of stabilizer, 0.5 to 10 wt% of foam stabilizing agent, 0.1 to 5 wt% of antistatic agent , 5 to 25 wt% of plasticizer at 30 DEG C to 50 DEG C for 0.5 to 2 hrs; and when in use, the component A and the component B are together pressed into a coal (rock) layer according to the mass ratio of 1 to 2 : 1, penetrate into tiny cracks and expand, meanwhile react and generate CO2 gas and further expand, thereby effectively reinforcing and sealing processing areas. The compressive strength of polyurethane reinforcing and filling materials for coal mines is more than 55 MPa, the bond strength is more than or equal to 4 MPa, the foaming factor is less than or equal to two times. The invention can meet the need of coal mine safe production, and can be used for hydropower, construction, mining, transportation and other industries.

The invention discloses a high-strength and high-toughness polyurethane material and a preparation method thereof. The high-strength and high-toughness polyurethane material is prepared by the reaction of the following raw materials: an A component, a B component and a C component, wherein the A component comprises a polyurethane prepolymer and one or two or more of polymethylene polyphenyl isocyanate and diisocyanate derivatives; the B component comprises a small-molecular chain extender and one or two or more of high polymer polyols and high polymer polyamines; and the C component comprises a catalyst and an antioxidant, as well as one or two or more of optional components, namely a dewatering agent, a defoaming agent, a plasticizer and an anti-hydrolysis agent. The prepared polyurethane material has special high strength and good toughness, and can withstand high-strength impact and prevent fracture; and furthermore, the bending strength can achieve 75-95MPa, the bending modulus can achieve 1900-2950MPa, and the impact strength can achieve 60-95KJ/m<2>.

The invention relates to the field of polyurethane, particularly a preparation method and application of 100% water-base foamed polyurethane foam. The 100% water-base foamed polyurethane foam is characterized by comprising a component A and a component B in a mass ratio of 1:1, wherein the component A is polymethylene polyphenyl isocyanate; the component B comprises polyalcohol, catalysts, foam stabilizer, pore opening agent, foaming agent, emulsifier and flame retardant; and the polyalcohol comprises polyether glycol, polyester polyol and flame-retardant polyether glycol. The invention is characterized by adopting high-proportion water. The invention adopts multiple assistants, and especially ingeniously uses three or two catalysts to ensure the open pore foam to have an open pore structure, the foam pores are compact and open, the meridian fibers of the foam pores are thin and soft, and the heat conductivity coefficient of the foam can still reach 0.036-0.040 (W/M.K).

The invention discloses a single-component moisture-curing polyurethane adhesive and a preparation method thereof. The preparation method of the adhesive is characterized by comprising the following step: by adopting an organic solvent as a solvent, performing reaction on polyether glycol and/or polyester glycol, diphenyl methane diisocyanate, polymethylene polyphenyl isocyanate and triatomic primary alcohol of which the molecular weight is less than 200 to prepare the adhesive. The average degree of functionality of an obtained high-functionality NCO-terminated prepolymer is more than or equal to 3, and the single-component moisture-curing polyurethane adhesive disclosed by the invention is suitable for splicing and tenoning (or assembling) of woods and bonding and compounding of stone materials, fireproof plates, plastic aluminum plates, bakelite plates, oak boards, some metals such as aluminum and iron, zinc-plating plates, PVC membranes and the like, is especially suitable for adhesion of rosewoods and red woods, and can meet the special requirements of some products.

The invention relates to the compound board making using corn and wheat straw, comprising the material processing, mixed gluing, spreading, preheating, hot pressing and after treatment. It can recycle the corn and wheat straws, using polymethlene polyphenyl isocyanate and isocyanate solution in 1:1-1:2. 5 proportion to form the isocyanate adhesive, quick in high temperature solidification, strong in adhesion, low in formaldehyde emission, perfect for indoor decoration. It is highly biological.

The invention relates to a two-component polyurethane grouting material for repair and maintenance of a road and a preparation method thereof. The two-component polyurethane grouting material is formed by mixing a component A with a component B through foaming expansion. The component A comprises the following raw materials in parts by weight: 800 to 900 parts of polyether glycol, 50 to 150 partsof cross linking agent, 10 to 30 parts of foaming agent, 10 to 30 parts of foam stabilizer, and 10 to 40 parts of catalyst. The component B comprises 500 to 1,000 parts by weight of poly methylene polyphenyl isocyanate. The two-component polyurethane grouting material has the advantages that the two-component polyurethane grouting material is used as a road maintenance material, also has low viscosity which meets the grouting requirement at a temperature of below zero, can effectively penetrate the inside of cracks of a foundation and can be cured in 1 to 10 minutes at normal temperature; thecuring time of the two-component polyurethane grouting material can be regulated by the type of the catalyst and the addition amount; the construction efficiency is improved; and the problem that when the road is repaired, the traffic needs to be blocked for a long time is solved.

The invention discloses a phase-change polyurethane foam and a preparation method thereof. The foam is prepared by subjecting a polyurethane foam raw material to processes of reacting, foaming, and curing; wherein the polyurethane foam raw material comprises polyether, polymethylene polyphenyl isocyanate, silicone oil, and methyl chloride; the reactions are carrier out after the mixing of a phase-change energy-storage microcapsule and the polyurethane foam raw material, the phase-change energy-storage microcapsule is composed of a capsule wall made of polyurethane-polysiloxane and a capsule core made of an organic phase-change material, and polycarbodiimide is taken as the cross-linking agent. The phase-change energy-storage microcapsule integrates the advantages of organic materials and inorganic materials together, namely has the organic materials' advantages of flexibility and elasticity, also has the inorganic materials' advantages of excellent mechanical performance and fire-retardant performance, and overcomes the shortage of easy separation between the conventional microcapsule and the foam substrate.

The invention describes a preparation method of a rigid polyurethane foam wood-imitation material. The preparation method comprises the following steps: taking a mixture of polyether glycol, a catalyst, a foam stabilizer, a foaming agent, a fire retardant and the like as a white material, taking polymethylene polyphenyl isocyanate as a black material, injecting a certain amount of the mixed materials into a mould at temperature of 23-25 DEG C of the white material and the black material with mechanical stirring rate of 2000-3000r/min and mass ratio of the white material to the black material as 100/105-110, and demoulding after being at constant temperature of 35 DEG C for half an hour to obtain the rigid polyurethane foam wood-imitation material. The polyether glycol in the white material is a mixture of GR-4110, GR-403 and GE-210; the catalyst is a mixture of SFC, A33 and PC-41; the foam stabilizer is AK-8805, and the foaming agent is a mixture of HCFC-141b and H2O; and the fire retardant is DMMP. The black material is PM-200, Suprasec 5005 or Desmodur 44V20L.

The invention provides a chitosan-polyurethane composite rigid closed-cell foam material and a preparation method thereof, which belong to the technical field of polyurethane materials. The material comprises the following components in part by weight: 100 parts of polyether glycol, 140 to 160 parts of polymethylene polyphenyl isocyanate, 0 to 3 parts of physical foaming agent and water, 10 to 15 parts of flame retardant, 1 to 4 parts of catalyst, 1.5 to 10 parts of foam stabilizer and 5 to 20 parts of chitosan powder. The preparation method comprises the following steps: drying polyether glycol, polymethylene polyphenyl isocyanate and chitosan powder; placing the obtained product to room temperature for later use; adding chitosan powder into polymethylene polyphenyl isocyanate and mechanically stirring the two for 2 hours to obtain a component A; performing mixing treatment to obtain a component B; performing polymerization and polymerization treatment to obtain a pouring die billet; curing the pouring die billet after die release to obtain a foamed material. The foam material prepared by the method has the advantages of biocompatibility and degradability, and the preparation method ensures that every property of the material is equivalent to that of polyurethane foam materials containing no chitosan.

The invention discloses a polyurethane heat insulation foaming material and a preparation method thereof. The polyurethane heat insulation foaming material comprises the following components in parts by weight: 100 parts of polyether polyol, 150-170 parts of polymethylene polyphenyl isocyanate, 5-30 parts of expanded perlite, 20-40 parts of a physical foaming agent, 10-15 parts of a flame retardant, 1-3 parts of a catalyst and 1.5-10 parts of a foam stabilizer. The density of hard polyurethane foams prepared by the preparation method is smaller than 65Kg/m<3>, the thermal conductivity is smaller than 21mW/m.K, the compressive strength is greater than 0.42MPa, the compression modulus is greater than 14MPa, and the oxygen index is more than or equal to 23, so that the polyurethane heat insulation foaming material is suitable for the field of heat insulation.

The invention discloses a release-controlled coated urea which comprises a core layer of urea and a coated layer enclosing the surface of the urea, wherein the coated layer is formed from solid inorganic mineral powder and polymethylene polyphenyl isocyanate, the coated layer amounts to 15-30% of the total weight, its thickness is 100-120 microns.

The invention relates to a polyurethane foam two-component raw material in compounds in the field of chemistry and a construction method thereof, and particularly relates to a polyurethane foam two-component raw material suitable for construction in autumn and winter for hydraulic concrete dam insulation engineering and the repair of cracks in a low temperature cold storage. The polyurethane foam two-component raw material comprises an isocyanate component and a polyol component, wherein the polyol component contains low-temperature and highly active polyether polyol which accounts for 15-45% of the total weight of the polyol component, the polyol component contains a physical foaming agent having a boiling point not higher than the construction temperature of 20 DEG C and accounting for 5-25% of the total weight of the polyol component, the isocyanate component is polymethylene polyphenyl isocyanate, a viscosity reducer, which accounts for 5-25% of the weight of polymethylene polyphenyl isocyanate, is added into polymethylene polyphenyl isocyanate and the viscosity of the polymethylene polyphenyl isocyanate is reduced to 100cps or less after the addition of the viscosity reducer. The polyurethane foam two-component raw material disclosed by the invention can be normally constructed at -30 DEG C and above ambient temperature.

The invention relates to a moisture-curing polyurethane epoxy coal-tar bitumastic. The invention adopts a technical scheme that: the bitumastic is formed by a component A and a component B in a weight ratio of 1:1-1:2; and the preparation method comprises the following steps of: placing 37 to 40 parts of polymethylene polyphenyl isocyanate, 11 to 13 parts of polyether 330 or 3,030, 2 to 3 parts of polyether 635 or 450, 8 to 9 parts of DOP or DBP, 3 to 4 parts of epoxy resin, 0.002 to 0.003 part of phosphoric acid and 33 to 37 parts of solvent No.S10,000 or industrial xylene in a reaction kettle at the temperature of between 81 and 86 DEG C, preserving the heat for 2 hours, and cooling the raw materials to obtain the component A; and placing 62 to 66 parts of coal-tar, 9 to 10 parts of cyclohexanone, 10 to 11.5 parts of toluene, and 7 to 8 parts of solvent No.S1,000or industrial xylene in the reaction kettle at the temperature of between 115 and 120 DEG C, preserving the heat for 2 hours, and cooling the raw materials to obtain the component B. The coating applied by the bitumastic is waterproof and long in life time and can further protect equipment and pipes.

The invention provides a bi-component polyurethane structural adhesive for bonding power batteries and a preparation method of the bi-component polyurethane structural adhesive. The polyurethane structural adhesive comprises a component A and a component B. The component A comprises 40-65 parts of polymethylene polyphenyl isocyanate, 30-50 parts of aluminum hydroxide, 2-5 parts of hydrophobic fumed silica and 0-5 parts of a plasticizer. The component B comprises the following components in parts by weight: 40-65 parts of bio-based polyol, 1-4 parts of fumed silica, 25-50 parts of a flame retardant, 1-5 parts of an adhesion promoter and 0.01-0.5 parts of a catalyst. The bio-based polyol is selected from one or more of rapeseed oil modified polyol, castor oil modified polyol, soybean oil modified polyol and palm oil modified polyol. The adhesion promoter is prepared by reacting aminophenylsilane with a silane modifier. The adhesive is relatively high in bonding strength and has a mediumelastic modulus. The flame-retardant effect is good, the adhesive has excellent adhesion performance to materials such as bare aluminum and PET films, and the adhesive can be used for structural adhesion of power battery PACKs.

The invention relates to a synthetic method of modified high-toughness epoxy vinyl ester resin, belonging to the technical field of high-molecular polymers. The synthetic method is characterized by comprising the following steps of: (1) sequentially adding 40%-50% of bisphenol A type epoxy resin, 8%-20% of unsaturated monocarboxylic acid, 2.5%-11% of long-chained saturated dicarboxylic acid, 0.1%-1.0% of catalyst A, and 0.01%-0.1% of polymerization inhibitor into a reaction kettle; (2) controlling the temperature to be 100-130 DEG C to measure an acid value until the acid value is reduced to 10mgKOH/g below; and (3) cooling to about 100 DEG C, then adding 28%-40% of crosslinking agent, 1.0-5.0% of polymethylene polyphenyl isocyanate, and 0.05%-0.5% of catalyst B, and controlling the temperature to be 60-80 DEG C until the measured isocyanato concentration is zero, thus achieving the reaction endpoint. The synthetic method has the advantages that the long-chained saturated dicarboxylic acid is used for partially replacing an unsaturated monocarboxylic acid to react, dilution is carried out before the polymethylene polyphenyl isocyanate is added for chain extension, the chain extension reaction is thorough, and the toughness effect is good. The synthetic method is simple in technology, clear in endpoint, less in side effects, and free from generation of three wastes, and the quality is stable.

The invention discloses a hard polyurethane flame-retardant heat-insulation material for external walls. The material is composed of a component A and a component B; the component A is prepared from, by weight, 60-80 parts of polyether polyol, 30-40 parts of phenolic resin, 20-30 parts of brominated epoxy resin, 10-30 parts of vitrified microspheres, 10-20 parts of expanded vermiculite, 5-15 parts of nano silicon dioxide, 3-8 parts of glass fibers, 5-10 parts of sepiolite fibers, 5-15 parts of filler, 8-15 parts of a foaming agent and 5-10 parts of auxiliary agents; the component B is polymethylene polyphenyl isocyanate. The hard polyurethane flame-retardant heat-insulation material which integrates excellent flame retardation and mechanical performances is provided to solve the problem of mutual contradiction between flame retardation and mechanical performances of previous rigid polyurethane foam heat-insulation materials.

The invention discloses all-water foamed molding slow-rebound bloating foamed cotton of MDI (polymethylene polyphenyl isocyanate) with the density of 45kg/m<3>. For the isocyanate in the MDI system, the functionality is 2-3 and the NCO value is 26-30; the polyether polyol is prepared by mixing the following materials: polyol A with the functionality being 3 and the hydroxyl value being 32-60mgKOH/g, polyol B with the functionality being 2 and the hydroxyl value being 240-260mgKOH/g, polyol C with the functionality being 3 and the hydroxyl value being 240-260mgKOH/g, polyol D with the functionality being 3 and the hydroxyl value being 20-28mgKOH/g; and a foaming agent is H2O. The molding slow-rebound bloating foamed cotton disclosed by the invention has the advantages that due to use of MDI for production, the harm can not be caused to a human body, water generates trace carbon dioxide in the foaming reaction, and the pollution to the atmosphere is almost zero; in conclusion, the use is safe and the processing is no-pollution.

The invention relates to an automobile roof polyurethane composition which mainly solves the problems existing in the prior art such as high VOC value and great odor due to relatively high aldehyde content. With the adoption of the technical scheme of the invention, the low-VOC low-odor automobile roof composition is composed of a component A and a component B, wherein a ratio of the weight percentage of the component A to the component B is 1:(1.1-2.0); the component A comprises polyether polyol, polyester polyol, polypolyols, a chain extender, a foam stabilizer, a catalyst, water and at least one aid of colorants, antioxidants and dispersing agents; and the component B refers to polymethylene polyphenyl isocyanate or modified polymethylene polyphenyl isocyanate. The problems are well solved, and the composition can be used in industrialized production of the low-VOC low-odor automobile roof composition.

The invention discloses an isocyanate curing agent with fluorescence characteristic and a preparation method thereof. The raw materials for preparing the isocyanate curing agent with fluorescence characteristic include polymethylene polyphenyl isocyanate and (E)-4,4'-dihydroxyl tetraphenylethylene, wherein the mass ratio of the polymethylene polyphenyl isocyanate to (E)-4,4'-dihydroxyl tetraphenylethylene is (99:1)-(80:20). The preparation scheme comprises the following steps: dissolving the polymethylene polyphenyl isocyanate and (E)-4,4'-dihydroxyl tetraphenylethylene in certain solvent, stirring and heating for reacting for certain time; cooling; and evaporating with a rotary evaporator to remove the solvent to obtain the designed product solvent. In the invention, the preparation technology of fluorescent paint is simplified, and the defect of aggregation-induced quenching effect easily caused by adopting traditional organic fluorescent molecules is overcome.

The invention relates to the technical field of adhesives, in particular to a reactive thickening type two-component polyurethane glass adhesive and a preparation method thereof. The preparation method comprises the following steps of: mixing and stirring a component A and a component B in a volume ratio of 1: 0.8-1.2 for 5-20min to prepare the glass adhesive. The component A comprises 40-75% of atwo-component polyurethane prepolymer, 1-15% of polymethylene polyphenyl isocyanate, 20-40% of a reinforcing filler A, 0.1-2% of a catalyst A, 0.1-2% of an adhesion promoter A and 0.1-2% of a water removal agent. The component B comprises 30-65% of a low-activity cross-linking agent, 1-10% of a high-activity cross-linking agent, 20-40% of a reinforcing filler B, 10-25% of a plasticizer B, 0.1-2%of a catalyst B and 0.1-2% of an adhesion promoter B. The preparation method of the invention has simple operation, convenient control, low production cost and high product quality, and can be used for large-scale production.

The invention discloses an environment-friendly high-buffering-property polyurethane packaging material. The packaging material is formed by mixing a combined polyether raw material and polymethylene polyphenyl isocyanate, wherein the combined polyether raw material is composed of, by proportion, 40-45 parts of polyether trihydric alcohol, 30-40 parts of polyether glycol, 3-8 parts of chain extenders, 2-5 parts of foam stabilizers, 20-30 parts of water, 0.3-0.6 part of dimethylamino ethylether and 0.3-0.5 part of triethylene diamine. The proportion of the polymethylene polyphenyl isocyanate to the combined polyether raw material is 0.8-1.0:1. The material has a good buffering property, the buffering property is three times that of a general foaming material, and the material has good elasticity, and can be used repeatedly, and foamed and formed into the packaging material anytime and anywhere within a short time; as the water is used for replacing other foaming agents, intensity is low, the production cost is reduced, substances damaging an ozone layer are avoided, pollution is really reduced, and the environment-friendly effect of the foaming agent is completely achieved.

This is a kind of polyurethane outer wall thermal insulation material belonging to chemical technology field. The invention is double components reaction. The First Component is the mixture of polyether polyols, PET alcoholysis and various auxiliary agents, and the Second Component is polyarylpolymethylene polyphenyl isocyanate (PAPI). When used, mix according to proportion can adopt smearing method to construct. Because of adding PET alcoholysis, it can observably improve the foam porosity structure of product. The obtained product has certain toughness, and the break elongation ratio is improved. It can form compact and hard epidermis when frothing, so it has certain waterproof effect besides thermal insulation. It can be applied for outer wall thermal insulation with both effects of reducing energy waste and waterproofness. The PET alcoholysis is made from PET waste material, so its cost is lower than polyether polyols,. Its addition can reduce the cost of outer wall thermal insulation material. Besides it provides new mentality for the use of PET waste material.