The invention discloses a two-component PU (polyurethane) coating. Firstly, castor oil is used for cross-linking prepolymers: a multifunctional group structure in the castor oil can cross-link the polymers to a certain extent, the cross-linking degree of the polymers is increased, so that the interaction force among molecular chains is increased, motion of the molecular chains is hindered, water molecules can hardly enter the molecular chains to enable the polymers to swell, and the water absorption of a film is reduced; meanwhile, the castor oil is a triglyceride of fatty acid, the film has the good hydrophobicity due to long nonpolar fatty acid chains in molecules of the castor oil, and the water absorption is further reduced; besides, ester groups in the castor oil have higher cohesive energy, so that the tensile strength of the film can be enhanced; ethyl cellulose has better heat resistance and thermoplasticity, has good compatibility with PU and can improve the comprehensive performance of the prepolymers; then blending modification is performed on the PU prepolymers and polysilsesquioxane.

Two-component PU (polyurethane) coating and preparation method thereof

The invention discloses a novel high-strength polyurethane waterproofing paint which consists of a component A and a component B. The component A is prepared from the following components in parts by weight: 140-350 parts of polyether polyol, 20-60 parts of TDI (toluene diisocyanate), 20-60 parts of diphenylmethane diisocyanate and 50-100 parts of a plasticizer; the component B is prepared from the following components in parts by weight: 50-100 parts of polyether polyol, 40-200 parts of a plasticizer, 20-80 parts of a chain extender, 100-300 parts of pigment and filler, 0.1-0.5 part of a catalyst, 0.1-0.5 part of a polymerization inhibitor and 0.1-1 part of a high-performance accessory ingredient defoaming agent. The invention also comprises a preparation method of the high-strength polyurethane waterproofing paint. The high-strength polyurethane waterproofing paint disclosed by the invention has relatively long operable construction time and excellent physical and mechanical properties such as high strength, high elongation rate and high bonding strength, and is low in residual TDI and toxicity. The novel high-strength polyurethane waterproofing paint can be widely applied to infrastructure construction and municipal traffic engineering, and particularly to water resistance of important projects such as high-speed railways and highway bridges.

Novel high-strength polyurethane waterproofing paint and preparation method thereof

The invention discloses a preparation method of an environmental-protection polyurethane waterproof coating. The preparation method comprises the following steps: 1) preparing a component A, namely a polyurethane prepolymer; 2) preparing a component B, namely a pigment filler; and 3) adding the pigment filler into 20-30 parts of the polyurethane prepolymer, adding a thickening agent, stirring for 1-2 h, and discharging to obtain the environmental-protection polyurethane waterproof coating. The new-generation double-component environmental-protection color polyurethane waterproof coating which contains no any solvent, has high solid content, has no pollution during a construction process, and has stable film coating performance, adjustable colors and excellent cost performance is prepared with a chlorinated paraffin liquid and industrial waste slag fly as a mixed filler.

Preparation method of polyurethane waterproof coating

The invention discloses heavy corrosion-resistant paint for industry. The heavy corrosion-resistant paint comprises the following components in parts by weight: 10-30 parts of epoxy resin, 25-45 parts of polyurethane, 2-15 parts of solvent, 2-4 parts of modified amino silicon oil, 1-5 parts of polysiloxane, 1-3 parts of chlorinated paraffin, 1-3 parts of sodium polycarboxylate, 5-10 parts of polyamide, 8-15 parts of D9050 modified aromatic resin epoxy curing agent and 13-17 parts of additive; the additive comprises the following components in parts by mass: 10-15 parts of dispersing agent, 5-10 parts of thickening agent, 5-10 parts of film-forming additive, 1-5 parts of PH adjusting agent, 5-10 parts of silane coupling agent, 2-6 parts of delustering agent and 1-6 parts of defoaming agent. The heavy corrosion-resistant paint disclosed by the invention has strong corrosion-resistant property and anti-salt-mist property and can be firmly adsorbed on the surface of metal so as to have good corrosion-resistant and anti-rusting property; and the heavy corrosion-resistant paint has the advantages that the corrosion-resistant time is long, the raw materials are easily obtained, the production process is simple, the construction is convenient, the operation is easy, the drying speed is high, the construction period is short and the demolding is not needed in the following processing procedure. The invention also discloses a method for preparing the heavy corrosion-resistant paint for industry.

Heavy corrosion-resistant paint for industry and preparation method thereof

The invention discloses a preparation method of an environment-friendly light-resistant and waterproof polyurethane coating and adhesive. The preparation method comprises the steps of mixing polytetramethylene ether glycol and isophorone diisocyanate in the existence of a dibutyltin dilaurate catalyst according to the NCO to OH molar ratio of 1.5:1 to 4.5:1, reacting at the temperature of 80-100 DEG C for 1-4h, adding lipidosome, and reacting at the temperature of 80 DEG C for 1h to obtain a polyurethane prepolymer A; adding a chain extender accounting for 1.2-3.2% of the weight of the prepolymer A and 1, 1, 2-trifluorotrichloroethane accounting for 12-25% of the weight of the prepolymer A into the prepolymer A, reacting at the temperature of 65-85 DEG C for 1.5-3.5h, adding a fluorine compound accounting for 0.5-1.2% of the weight of the prepolymer A, reacting at the temperature of 75-85 DEG C for 1-2h, adding triethylamine accounting for 10-15% of the weight of the prepolymer A to carry out neutral reaction for 30-50min, adding water to emulsify to obtain the environment-friendly light-resistant and waterproof polyurethane coating and adhesive. The prepared light-resistant polyurethane coating and adhesive is environment-friendly and low in price, can be widely applied to the surfaces of a wall, furniture and metal ware, and can be used as an adhesive for plastics, glass, papermaking and textiles.

Preparation method of environment-friendly light-resistant and waterproof polyurethane coating and adhesive

The invention relates to a bi-component polyurethane coating which is prepared from a component A and a component B in a weight ratio of 1:(1-3), wherein the component A comprises the following materials in parts by weight: 40-80 parts of polylol, 20-50 parts of polyisocyanates, 1-10 parts of plasticizer and 0-5 parts of storage stabilizing agent; and the component B comprises the following materials in parts by weight: 10-40 parts of polylol, 10-40 parts of liquid filler, 5-10 parts of crosslinking agent, 30-60 parts of solid filler, 3-15 parts of plasticizer, 0.1-8 parts of thixotropic agent, 0-5 parts of pigment and 0.2-5 parts of additive. The bi-component polyurethane coating is suitable for water prevention, permeability resistance, corrosion resistance and protection of a horizontal plane, can be thickly coated and constructed (>3mm/turn) on complex parts such as a vertical surface and an incline, does not generate sagging and bubble phenomena in a construction process, is full in color, and has the advantages of excellent mechanical property, shock resistance, water resistance and corrosion resistance.

Bi-component polyurethane coating and preparation method thereof

The invention discloses a polyurethane/polyurea composite protective layer and a preparation method thereof, and application of the polyurethane/polyurea composite protective layer in concrete shielding. The polyurethane/polyurea composite protective layer comprises a concrete base layer, a polyurethane elastic layer and a polyurea layer from bottom to top. The preparation method comprises the following steps: treating the surface of the concrete, and forming the polyurethane elastic layer by a multiple brushing or spraying method until reaching the designed thickness; and after the surface of the last brushing or spraying polyurethane layer becomes dry, spraying at least one polyurea layer to form the polyurethane/polyurea composite protective layer. The invention can be used for combined shielding of concrete surfaces in track traffic, parking lots, airports, roofs, road surfaces, playgrounds, sewage treatment plants, harbors, navigation locks, waterways, bridges, tubular piles and the like. The invention combines the elasticity, toughness and low price of the polyurethane with the shock resistance, wear resistance, corrosion resistance, aging resistance and other characteristics of the spraying polyurea to obtain the composite protective layer which has the advantages of excellent water resistance, excellent corrosion resistance, excellent shock resistance, high cost performance and high construction speed.

Polyurethane/polyurea composite protective layer and preparation method thereof, and application of polyurethane/polyurea composite protective layer in concrete shielding

The invention discloses a single-component polyurethane latent curing agent and a preparation method and an application thereof. The preparation method comprises the following steps of: A, putting X into a reaction kettle, and heating to 20-80 DEG C; B, continuously adding Y into a reactant within 1-4 hours, wherein the molar ratio of X to Y is (1:2)-(1:4); and C, heating the reactant to 100-180 DEG C, preserving heat for 2-9 hours, and collecting generated water, wherein X and Y are R1 or H or CH3; n is an integer ranging from 1 to 100; and R2 and R3 are H, alkyl, aryl or alkaryl. The surface drying time of single-component polyurethane containing the latent curing agent is 3-12 hours, the tensile strength is 2.4-6.5MPa, the elongation at break is 435-800 percent, and the tearing strength is 17-25N/mm; and a prepared film has a complete and continuous surface and is free from the phenomena of bubbles and hollowing.

Single-component polyurethane latent curing agent and preparation method and application thereof

The utility model discloses a waterproof, heat-preserving and root thorn preventing planted roof structure, which comprises a building top plate base layer, a heat preserving layer, a polyurea-coated waterproof and root thorn preventing layer, a separation slideable isolating layer or a leveling and protection layer, a filtration and drainage layer and a light medium layer. Since the waterproof, heat-preserving and root thorn preventing planted roof structure uses the characteristic of spray coating construction of the polyurea-coated waterproof and root thorn preventing layer, the construction period can be greatly shortened. Since the spray coated polyurea material has the characteristics of excellent mechanical property and seamless construction, the damages to the waterproof layer during construction and application can be effectively avoided and the situation of root thorns can be prevented from occurring. By using the single-pass polyurea-coated waterproof layer instead of the traditional waterproof roll materials and the puncture-proof materials, not only can the requirement of the traditional two-pass waterproof layers be satisfied, but also the situation of root thorns can be precluded and the goal of prolonging the service life is achieved; and at the same time, since the heat-preserving layer and soil plants have dual heat preserving effects, the goals of energy saving and environmental friendliness are better realized.

Waterproof, heat-preserving and root thorn preventing planted roof structure

The utility model relates to a high-performance elastic polyurea / polyurethane composite terrace structure. The structure comprises a rigid base layer, an elastic polyurethane layer and a polyurea-spraying layer which are arranged from bottom to top. The high-performance elastic polyurea / polyurethane composite terrace structure is comfortable in touch, low in noise, abrasion proof, impact proof, aging resistant, and shearing resistant and has a surface which is smooth and easy to tidy and the like. The high-performance elastic polyurea / polyurethane composite terrace structure can be applied in various fields like factories, commercial spaces, airports, working spaces, sport fields and parking places and the like.

High-performance elastic polyurea / polyurethane composite terrace structure

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