CN106674991A - Modified polyurethane cold-patch liquid, preparation method and use method - Google Patents

Abstract

The invention discloses a modified polyurethane cold-patch liquid, a preparation method and a using method thereof, and the modified polyurethane cold-patch liquid comprises 100-140 parts of polyisocyanate, 80-150 parts of polyether polyol, 80-150 parts of polyester polyol, 10-15 parts of SBS resin, 0.03-0.15 part of catalyst, 200-300 parts of diluent, 20-40 parts of plasticizer and 0.5-1 part of defoaming agent. The invention utilizes-NCO group contained in polyurethane to react with water absorbed on the surface of the aggregate to form covalent bond, complex and the like. Can directly mix with the aggregate, the expressway is restoreed, is not restricted by the season, and after the restoration is accomplished, the influence traffic time is short, is applicable to under any weather and the environment, repairs the road surface course of various different grade types. Can meet the use performance of roads in alpine regions and prolong the service life of the roads. Simple operation, convenient use, good storage stability, wide application, low repair cost, remarkable social benefit and easy industrialization.

Description

A modified polyurethane cold replenishment liquid, preparation method and use method

technical field

The invention relates to a cold replenishment fluid for asphalt roads, in particular to a modified polyurethane cold replenishment fluid, a preparation method and a use method.

Background technique

Traditional thermal repair construction is very inconvenient for road surface repairs with scattered locations and small works, and it cannot be carried out normally in rainy and snowy weather. The cold patching method makes up for the shortcomings of the hot method, and is suitable for repairing various types of road surfaces in any weather and environment, so its application in road maintenance is increasing year by year.

Ordinary cold replenishment liquid often has low initial strength. Later, because the diluent volatilizes slowly and cannot quickly form strength, after opening traffic, it is prone to loosening, falling off and other diseases again. The durability is poor, and it can only be used as a temporary treatment for diseases. measure.

The asphalt modification has been studied at home and abroad. Modified asphalt is to add modifiers to asphalt to improve the performance of asphalt or asphalt mixture. Among them, the modifiers are mostly: rubber, resin, high molecular polymer, finely ground rubber powder or other fillers. The disadvantages of this asphalt modification method are: because the modifier is simply added to the asphalt for physical blending, the problem of segregation and stratification is easy to occur, and the asphalt has strong temperature sensitivity, low viscosity, and poor flexibility. Although other problems have been improved, the effect is not ideal.

Chinese invention patent CN201210307108.6 discloses a method for preparing polyurethane-modified asphalt. Under the action of an initiator, asphalt and allyl alcohol are reacted to prepare hydroxyl-containing asphalt, and then reacted with isocyanate to obtain polyurethane-modified asphalt. It just improves the asphalt's low-temperature brittleness and poor flexibility. But asphalt construction performance and other properties have not fundamentally changed.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a modified polyurethane cold replacement fluid, a preparation method and a use method, which can quickly form high strength and improve durability.

The present invention is achieved through the following technical solutions: a modified polyurethane cold replenishment liquid of the present invention, which comprises 100-140 parts of polyisocyanate, 80-150 parts of polyether polyol, 80-150 parts of polyester polyol, 10-15 parts of SBS resin, 0.03-0.15 parts of catalyst, 200-300 parts of diluent, 20-40 parts of plasticizer, and 0.5-1 part of defoamer.

The polyisocyanate is selected from one or more of aromatic polyisocyanate, aliphatic polyisocyanate ester and cyclic polyisocyanate.

The polyether polyol is selected from polyethylene glycol, polyoxypropylene diol, polytetrahydrofuran diol, tetrahydrofuran-oxypropylene copolymerized diol, polybutadiene diol, polybutadiene polyether diol, polybutadiene at least one of diene-acrylonitrile diols.

The polyester polyol is selected from polyethylene adipate diol, polyethylene adipate-propylene glycol ester diol, polyethylene adipate diethylene glycol, polycarbonate 1, At least one of 6-hexanediol diol, polycaprolactone diol, and poly-1,4-butylene adipate diol.

The diluent is selected from acetone, methyl ethyl ketone, methyl ethyl ketone, dioxane, N,N-dimethylamide, N-methylpyrrolidone, ethyl acetate, methyl acetate, ethyl butyl ester, toluene, xylene , dichloromethane, carbon tetrachloride, dichloroethane, gasoline, kerosene, diesel at least one.

The plasticizer is selected from aliphatic dibasic acid esters, phthalic acid esters, benzoic acid esters, benzoic acid esters, polyol esters, chlorinated hydrocarbons, citric acid esters, polyesters at least one of the

The defoamer is selected from at least one of silicone defoamers, polyether defoamers, polyether modified silicone oil defoamers, and high-carbon alcohol defoamers.

The average molecular weight of the linear SBS of the SBS resin is 80,000 to 120,000. According to the mass fraction, it is 10-15 parts.

The catalyst includes one or two or more of organic tins and amines.

The cold replenishment liquid is a viscous liquid with a density of 1.1-1.2 g/cm ³ , a solid content of 30-85%, and a viscosity of 5000-8000 mPa·s ^-1 at 25°C.

A preparation method for modified polyurethane cold replenishment liquid, comprising the following steps:

(1) Heat polyether polyol or polyester polyol and asphalt to 110-120°C, dehydrate for 2-3 hours under a vacuum of 0.06-0.08MPa, and the mass fraction of water in the polymer polyol is less than or equal to 0.05% When the temperature is lowered to 40-50°C, the dehydrated polymer polyol is obtained;

(2) Slowly add polyisocyanate to the dehydrated polymer polyol prepared in step (1), under nitrogen protection, add SBS resin, catalyst and diluent, naturally heat up to room temperature and then heat up to 70-100°C, Insulate for 3-5 hours, then lower the temperature of the mixture to 40-50°C, add plasticizer, diluent, and defoamer in sequence and mix together for 0.3-1 hour to prepare polyurethane cold replenishment fluid.

A method for using a modified polyurethane cold replenishment liquid, the specific process is as follows: the modified polyurethane cold replenishment liquid is directly mixed with aggregates at normal temperature to prepare a cold repair asphalt mixture, and then road pits are repaired.

Some solvents in the existing cold-patch asphalt mixture continue to volatilize, making the asphalt material more and more viscous, the gap between the cold-patch mixture is getting smaller and smaller, and the distribution of particles is more compact and uniform. The stickiness is stronger. The present invention is realized by chemical reaction. The -NCO group contained in polyurethane reacts with the adsorbed water on the surface of the aggregate to form covalent bonds and complexes, etc., forming high strength.

Compared with the prior art, the present invention has the following advantages: the present invention overcomes the disadvantages of low initial strength and slow strength growth of ordinary cold replenishment liquid. It can form higher strength faster, shorten the time for open traffic, has excellent road performance and durability, can meet the performance of roads in alpine regions, and prolong the service life of roads. It can be directly mixed with aggregates without heating. Combined, rapid road repair, not subject to seasonal restrictions, after the repair is completed, the impact on traffic is short, suitable for any weather and environment, repairing various types of road surfaces. It can meet the performance of roads in alpine regions and prolong the service life of roads. The invention has the advantages of simple operation, convenient use, good storage stability, wide application, low maintenance cost, remarkable social benefit and easy industrialization.

detailed description

The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

Example 1

The preparation method of the modified polyurethane cold replacement fluid of the present embodiment is as follows:

(1) Heat 100 parts of polyether 220, 100 parts of polyethylene adipate diol and 50 parts of petroleum asphalt to 110-120°C, dehydrate for 3 hours under a vacuum of 0.06MPa, and measure the moisture content of the polymer polyol When the mass fraction is below 0.05%, the temperature is lowered to 40°C to obtain dehydrated polymer polyol;

(2) Slowly add 110 parts of PAPI to the dehydrated mixed polyether prepared in step (1), under nitrogen protection, add 8 parts of SBS resin, 0.02 part of stannous octoate, 0.06 part of triethanolamine, 50 parts of xylene, 50 After the natural heating, the temperature was raised to 70°C, kept for 3 hours, and then the temperature of the product was lowered to 40°C, and 20 parts of chlorinated paraffin, 150 parts of ethyl acetate, and 0.5 parts of simethicone were added in order to blend After 0.5h, SBS modified polyurethane cold replacement fluid was prepared.

Appearance is brown viscous liquid; density is 1.13g/cm ³ ; solid content is 62%; viscosity (25°C) is 6600mPa·s ^-1 .

Example 2

The preparation method of the modified polyurethane cold replacement fluid of the present embodiment is as follows:

(1) Heat 120 parts of polyether 220, 120 parts of polyethylene adipate diol and 30 parts of natural asphalt to 110-120°C, dehydrate for 3 hours under a vacuum of 0.06MPa, and measure the moisture content of the polymer polyol When the mass fraction of is below 0.05%, the temperature is lowered to 50°C to obtain a dehydrated polymer polyol;

(2) Add 120 parts of 4,4'-diphenylmethane diisocyanate to the dehydrated polymer polyol prepared in step (1), under nitrogen protection, add 10 parts of SBS resin, 0.01 part of dibutyltin dilaurate, 0.03 parts of triethanolamine, 70 parts of toluene, 50 parts of dioxane, after the natural heating, the temperature was raised to 80°C, kept for 4 hours, then the temperature of the product was lowered to 50°C, and 30 parts of phthalate dioxane were added in sequence Butyl ester, 100 parts of methyl acetate, and 0.5 part of dimethyl silicone oil were blended for 0.5h to prepare SBS modified polyurethane cold replacement fluid;

The appearance is brown viscous liquid; the density is 1.16g/cm ³ ; the solid content is 70%; the viscosity (25°C) is 6250mPa·s ^-1 .

Example 3

The preparation method of the modified polyurethane cold replacement fluid of the present embodiment is as follows:

(1) Heat up 200 parts of polyether 330 and 70 parts of coal tar pitch to 115°C, dehydrate for 2.5 hours under a vacuum of 0.07MPa, and when the mass fraction of polyether moisture is measured to be below 0.05%, cool down to 45°C to prepare Obtain dehydrated polyether polyol;

(2) Slowly add 100 parts of toluene diisocyanate to the dehydrated polyether polyol prepared in step (1), under nitrogen protection, add 13 parts of SBS resin, 0.02 part of stannous octoate, 0.06 part of triethanolamine, 50 parts of tetrachlorohydrin Carbon dioxide, 25 parts of methyl ethyl ketone, 25 parts of N-methylpyrrolidone, after the natural temperature rise, the temperature was raised to 90°C, kept for 3h, and then the temperature of the product was lowered to 50°C, and 30 parts of dibutyl terephthalate, 180 parts of ethyl acetate and 0.8 parts of polydimethylsiloxane were blended for 0.5 hours to prepare SBS modified polyurethane cold replacement fluid;

Appearance is brown viscous liquid; density is 1.12g/cm ³ ; solid content is 58%; viscosity (25°C) is 5550mPa·s ^-1 .

Using the modified polyurethane cold replenishment fluid described in any one of Examples 1 to 3, directly mix the cold replenishment fluid with aggregates at room temperature to prepare a cold patch asphalt mixture, and then repair road pits. There is no need to heat during the mixing process, and the prepared cold-patch asphalt mixture has very good initial and forming strength, water damage resistance, and its construction workability is also good.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (10)

1. A modified polyurethane cold replacement fluid, characterized in that, by weight, it comprises 100 to 140 parts of polyisocyanates, 80 to 150 parts of polyether polyols, 80 to 150 parts of polyester polyols, and 10 to 15 parts of SBS resins , 0.03-0.15 parts of catalyst, 200-300 parts of diluent, 20-40 parts of plasticizer, and 0.5-1 part of defoamer. 2. A modified polyurethane cold replacement fluid according to claim 1, wherein the polyisocyanate is selected from one or more of aromatic polyisocyanates, aliphatic polyisocyanate esters, and cyclic polyisocyanates. 3. A kind of modified polyurethane cold replacement fluid according to claim 1, characterized in that, the polyether polyol is selected from polyethylene glycol, polyoxypropylene glycol, polytetrahydrofuran glycol, tetrahydrofuran-propylene oxide copolymer At least one of diol, polybutadiene diol, polybutadiene polyether diol, polybutadiene-acrylonitrile diol. 4. a kind of modified polyurethane cold replacement fluid according to claim 1, is characterized in that, described polyester polyol is selected from polyethylene adipate glycol, polyethylene adipate-propylene glycol ester Diol, polydiethylene glycol adipate diol, poly-1,6-hexanediol carbonate diol, polycaprolactone diol, poly-1,4-butylene adipate at least one of diols. 5. A kind of modified polyurethane cold replacement fluid according to claim 1, characterized in that, the diluent is selected from the group consisting of acetone, methyl ethyl ketone, methyl ethyl ketone, dioxane, N,N-dimethylamide, N- At least one of methylpyrrolidone, ethyl acetate, methyl acetate, butyl ethyl ester, toluene, xylene, methylene chloride, carbon tetrachloride, ethylene dichloride, gasoline, kerosene, and diesel. 6. A kind of modified polyurethane cold replacement fluid according to claim 1, characterized in that, the plasticizer is selected from the group consisting of aliphatic dibasic acid esters, phthalic acid esters, benzoic acid esters, benzoic acid At least one of esters, polyol esters, chlorinated hydrocarbons, citric acid esters, polyesters. 7. A kind of modified polyurethane cold replenishment fluid according to claim 1, characterized in that, the defoamer is selected from the group consisting of silicone defoamers, polyether defoamers, polyether modified silicone oil defoamers , at least one of high carbon alcohol defoamers. 8. A modified polyurethane cold replenishment liquid according to claim 1, characterized in that the cold replenishment liquid is a viscous liquid with a density of 1.1-1.2 g/cm ³ , a solid content of 30-85%, and a viscosity of 5000~8000mPa·s ^-1 at 25°C. 9. A method for preparing a modified polyurethane cold replacement fluid according to any one of claims 1 to 8, characterized in that it comprises the following steps: (1) Heat polyether polyol or polyester polyol and asphalt to 110-120°C, dehydrate for 2-3 hours under a vacuum of 0.06-0.08MPa, and the mass fraction of water in the polymer polyol is less than or equal to 0.05% When the temperature is lowered to 40-50°C, the dehydrated polymer polyol is obtained; (2) Slowly add polyisocyanate to the dehydrated polymer polyol prepared in step (1), under nitrogen protection, add SBS resin, catalyst and diluent, naturally heat up to room temperature and then heat up to 70-100°C, Insulate for 3-5 hours, then lower the temperature of the mixture to 40-50°C, add plasticizer, diluent, and defoamer in sequence and mix together for 0.3-1 hour to prepare polyurethane cold replenishment fluid. 10. A method for using modified polyurethane cold replenishment fluid according to claims 1-8, characterized in that the specific process is as follows: the modified polyurethane cold replenishment fluid is directly mixed with aggregates at room temperature to make cold patch asphalt mixture , and then repair the road potholes.