Two-component polyurethane composite material for pipeline repair as well as preparation method and application of two-component polyurethane composite material

Abstract

The invention relates to the technical field of high polymer materials, and discloses a two-component polyurethane composite material for pipeline repair as well as a preparation method and application thereof.The two-component polyurethane composite material comprises a component A and a component B. The component A is prepared from the following raw materials in parts by weight: 30-100 parts of diisocyanate, 80-120 parts of polyether polyol, 1-5 parts of a curing agent, 1-5 parts of a curing agent, 1-5 parts of a curing agent and 1-5 parts of a curing agent. 200 to 300 parts of polyphenyl polymethylene polyisocyanate, 1 to 1.5 parts of micromolecule chain extender, and 80 to 200 parts of plasticizer; the component B is water-soluble silicate; the double-component polyurethane composite material provided by the invention is used for pipeline repair, and is excellent in strength and wear resistance, controllable in operation time and high in cost performance.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to a two-component polyurethane composite material for pipeline repair and a preparation method and application thereof. Background Art

[0002] In modern urban construction and management, the maintenance and repair of pipeline systems is an important and complex project. The traditional excavation pipeline repair method has many inconveniences and risks, and the construction period and cost are not very controllable. It has certain adverse effects on traffic, environment and urban appearance. Therefore, trenchless repair technology came into being. Among them, trenchless repair materials, as a key part, have attracted much attention and are required to have the characteristics of high strength, corrosion resistance, high and low temperature resistance, and wear resistance.

[0003] Currently, the common trenchless repair materials on the market mainly include glass fiber reinforced plastic, epoxy resin, polymer composite materials, etc. These materials have their own advantages and disadvantages. They have shortcomings such as insufficient strength and wear resistance and high prices, which limit and restrict the development of trenchless pipeline repair technology. Summary of the invention

[0004] The purpose of the present invention is to provide a two-component polyurethane composite material for pipeline repair. The two-component polyurethane composite material has the advantages of excellent strength and wear resistance, controllable operation time and high cost performance, and is suitable for trenchless pipeline rapid repair.

[0005] In order to achieve the above object, the present invention provides a two-component polyurethane composite material for pipeline repair, comprising component A and component B, wherein component A is prepared from the following raw materials in parts by weight: 30-100 parts of diisocyanate, 80-120 parts of polyether polyol, 200-300 parts of polyphenyl polymethylene polyisocyanate, 1-1.5 parts of small molecule chain extender, and 80-200 parts of plasticizer;

[0006] The B component is a water-soluble silicate.

[0007] Preferably, the diisocyanate is toluene diisocyanate or diphenylmethane diisocyanate, or a combination thereof.

[0008] Preferably, the small molecule chain extender is a mixture of dimethylolpropionic acid and neopentyl glycol in a weight ratio of 1:2.

[0009] Preferably, the polyphenylpolymethylene polyisocyanate is a polyisocyanate mixture having an NCO content of 30-36%.

[0010] Preferably, the molecular weight of the polyether polyol is 2000-5000 and the functionality is 2 or 3;

[0011] Polyoxypropylene diols or triols meeting the above molecular weight and functionality requirements are preferred.

[0012] Preferably, the plasticizer is one or more of chlorinated paraffin, dibutyl phthalate, and dimethyl phthalate.

[0013] Preferably, the water-soluble silicate is industrial-grade liquid sodium silicate with a modulus of 2.0-2.6 and a Baume degree of 50-53.

[0014] Another aspect of the present invention provides a method for preparing the above-mentioned two-component polyurethane composite material for pipeline repair, the method comprising the following steps:

[0015] Preparation of component A: Add polyether polyol, small molecule chain extender and plasticizer into a container, stir evenly, heat to 90-100°C, vacuum dehydrate for 1 hour, cool to 60°C, add diisocyanate at one time, stir, keep warm at 75-80°C for 2 hours, then add polyphenyl polymethylene polyisocyanate, stir for 1 hour, cool, filter and package to obtain component A.

[0016] In another aspect, the present invention provides an application of the above-mentioned two-component polyurethane composite material for pipeline repair, the application comprising mixing component A and component B in a volume ratio of 1:(1-3) to obtain a mixture, and then spreading the mixture on a glass fiber cloth to ensure that the mixture is evenly spread and impregnated on the glass fiber cloth;

[0017] The glass fiber cloth impregnated with the mixture is gently fixed on a special repair airbag, which is then sent to the repair point of the pipeline. The repair airbag is inflated to fill the entire pipeline. After 40-60 minutes, the repair status is checked by a camera. After solidification is confirmed, the pipeline leak is repaired.

[0018] Preferably, the density of the glass fiber cloth is 600-1000 g / m2;

[0019] Preferably, the weight ratio of the mixture formed by the component A and the component B to the glass fiber cloth is (1.5-1.8):1.

[0020] In the two-component polyurethane composite material provided by the present invention, since the raw materials for preparing component A include diisocyanate, polyether polyol, polyphenyl polymethylene polyisocyanate, small molecule chain extender and plasticizer, and component B is water-soluble silicate, it can have the characteristics of both polyurethane and water-soluble silicate, and a cross-linking grafting reaction occurs between the two, and the time is controllable; the catalytic performance of potassium ions in polyether polyol is cleverly utilized, and no external catalyst is needed.

[0021] The two-component polyurethane composite material provided by the present invention is used for pipeline repair, has excellent strength and wear resistance, controllable operation time and high cost performance. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods. It should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0023] As described above, the present invention provides a two-component polyurethane composite material for pipeline repair, including component A and component B, wherein component A is prepared from the following raw materials in parts by weight: 30-100 parts of diisocyanate, 80-120 parts of polyether polyol, 200-300 parts of polyphenyl polymethylene polyisocyanate, 1-1.5 parts of small molecule chain extender, and 80-200 parts of plasticizer; component B is water-soluble silicate.

[0024] In the present invention, since the raw materials for preparing component A include diisocyanate, polyether polyol, polyphenyl polymethylene polyisocyanate, small molecule chain extender and plasticizer, and component B is water-soluble silicate, it can have the characteristics of both polyurethane and water-soluble silicate, and a cross-linking grafting reaction occurs between the two with controllable time; the catalytic performance of potassium ions in polyether polyol is cleverly utilized, and no external catalyst is needed.

[0025] The two-component polyurethane composite material provided by the present invention is used for pipeline repair, has excellent strength and wear resistance, controllable operation time and high cost performance.

[0026] In the present invention, the diisocyanate is toluene diisocyanate or diphenylmethane diisocyanate, or a combination thereof.

[0027] The inventors of the present application also found that in the technical solution provided by the present invention, by controlling the type of small molecule chain extender, especially by using dimethylolpropionic acid and neopentyl glycol for compatibility, the final obtained two-component polyurethane composite material has significantly excellent mechanical properties. Specifically, the small molecule chain extender is a mixture of dimethylolpropionic acid and neopentyl glycol in a weight ratio of 1:2.

[0028] In the present invention, the polyphenyl polymethylene polyisocyanate is a polyisocyanate mixture with an NCO content of 30-36%.

[0029] In the present invention, the molecular weight of the polyether polyol is 2000-5000, and the functionality is 2 or 3; preferably, polyoxypropylene diol or triol that meets the above molecular weight and functionality requirements is used. The inventors of the present application have found that by using the polyether defined in the present invention, it has high activity and is easy to participate in the reaction, and the trace potassium ions contained therein can act as a catalyst, which can catalyze the subsequent reaction with water-soluble silicate.

[0030] In the present invention, the plasticizer is one or more of chlorinated paraffin, dibutyl phthalate, and dimethyl phthalate. It is understandable that the plasticizer can play the role of plasticizing, reducing viscosity and reducing cost.

[0031] In the present invention, the water-soluble silicate is industrial-grade liquid sodium silicate, with a modulus of 2.0-2.6 and a Baume degree of 50-53. The inventors of the present application have found that by selecting the industrial-grade liquid sodium silicate, it is easy to directly mix evenly with the prepared component A, and the reaction speed and the strength of the final product caused by its water content are most suitable.

[0032] The present invention also provides a method for preparing the above-mentioned two-component polyurethane composite material for pipeline repair, the method comprising the following steps:

[0033] Preparation of component A: Add polyether polyol, small molecule chain extender and plasticizer into a container, stir evenly, heat to 90-100°C, vacuum dehydrate for 1 hour, cool to 60°C, add diisocyanate at one time, stir, keep warm at 75-80°C for 2 hours, then add polyphenyl polymethylene polyisocyanate, stir for 1 hour, cool, filter and package to obtain component A.

[0034] In actual use, the prepared component A and the existing component B can be stirred and mixed evenly, which is simple and convenient.

[0035] The present invention also provides an application of the above-mentioned two-component polyurethane composite material for pipeline repair, the application comprising mixing component A and component B in a volume ratio of 1:(1-3) to obtain a mixture, and then spreading the mixture on a glass fiber cloth to ensure that the mixture is evenly spread and impregnated on the glass fiber cloth;

[0036] The glass fiber cloth impregnated with the mixture is gently fixed on a special repair airbag, which is then sent to the repair point of the pipeline. The repair airbag is inflated to fill the entire pipeline. After 40-60 minutes, the repair status is checked by a camera. After solidification is confirmed, the pipeline leak is repaired.

[0037] The density of the glass fiber cloth is 600-1000 g / m2; preferably, the weight ratio of the mixture formed by the component A and the component B to the glass fiber cloth is (1.5-1.8):1.

[0038] The two-component polyurethane composite material for pipeline repair provided by the present invention is further described below through specific examples.

[0039] Example 1

[0040] In the two-component polyurethane composite material provided in this embodiment, the raw materials for preparing component A are:

[0041] The diisocyanate is toluene diisocyanate, and the amount used is 30 parts;

[0042] The polyether polyol includes polyether triol - molecular weight 5000, functionality 3, amount 70 parts; polyether diol - molecular weight 2000, functionality 2, amount 20 parts;

[0043] The amount of polyphenyl polymethylene polyisocyanate is 200 parts;

[0044] The small molecule chain extender is a mixture of dimethylol propionic acid and neopentyl glycol in a weight ratio of 1:2, and the total amount of the small molecule chain extender is 1 part;

[0045] The plasticizer is chlorinated paraffin, and the dosage is 80 parts.

[0046] Component B is liquid sodium silicate with a modulus of 2.1 and a Baume degree of 51.

[0047] The preparation method of the two-component polyurethane composite material provided in this embodiment comprises the following steps: adding polyether polyol, small molecule chain extender and plasticizer to a container, stirring evenly, heating to 95°C, vacuum dehydration for 1h, cooling to 60°C, adding diisocyanate at one time, stirring, keeping warm for 2h at 75°C, adding polyphenyl polymethylene polyisocyanate, stirring for 1h, cooling, filtering and packaging to obtain component A; when in use, component A and component B are mixed evenly in a volume ratio of 1:2 to obtain a mixture. Record the operation time, drying time, and test the compressive strength and tensile strength, which are summarized in Table 1. Among them, the operation time refers to the time from the start of mixing and stirring to the time when it cannot flow, and the drying time refers to the complete curing reaction time.

[0048] Example 2

[0049] In the two-component polyurethane composite material provided in this embodiment, the raw materials for preparing component A are:

[0050] The diisocyanate is diphenylmethane diisocyanate, and the amount used is 44 parts;

[0051] The polyether polyol includes polyether triol-molecular weight 5000, functionality 3, and dosage 60 parts; polyether triol-molecular weight 3000, functionality 3, and dosage 26 parts;

[0052] The amount of polyphenyl polymethylene polyisocyanate is 220 parts;

[0053] The small molecule chain extender is a mixture of dimethylol propionic acid and neopentyl glycol in a weight ratio of 1:2, and the total amount of the small molecule chain extender is 1 part;

[0054] The plasticizer is dibutyl phthalate, and the amount used is 95 parts.

[0055] Component B is liquid sodium silicate with a modulus of 2.3 and a Baume degree of 52.

[0056] The preparation method of the two-component polyurethane composite material provided in this embodiment comprises the following steps: adding polyether polyol, small molecule chain extender and plasticizer to a container, stirring evenly, heating to 95°C, vacuum dehydration for 1h, cooling to 60°C, adding diisocyanate at one time, stirring, keeping warm for 2h at 75°C, adding polyphenyl polymethylene polyisocyanate, stirring for 1h, cooling, filtering and packaging to obtain component A; when in use, component A and component B are mixed evenly in a volume ratio of 1:2 to obtain a mixture. Record the operation time, drying time, and test the compressive strength and tensile strength, which are summarized in Table 1. Among them, the operation time refers to the time from the start of mixing and stirring to the time when it cannot flow, and the drying time refers to the complete curing reaction time.

[0057] Example 3

[0058] In the two-component polyurethane composite material provided in this embodiment, the raw materials for preparing component A are:

[0059] The diisocyanate is diphenylmethane diisocyanate, and the amount used is 45 parts;

[0060] The polyether polyol includes polyether triol-molecular weight 5000, functionality 3, and dosage 80 parts; polyether diol-molecular weight 2000, functionality 2, and dosage 25 parts;

[0061] The amount of polyphenyl polymethylene polyisocyanate is 240 parts;

[0062] The small molecule chain extender is a mixture of dimethylol propionic acid and neopentyl glycol in a weight ratio of 1:2, and the total amount of the small molecule chain extender is 1.5 parts;

[0063] The plasticizer is dibutyl phthalate, and the amount used is 106 parts.

[0064] Component B is liquid sodium silicate with a modulus of 2.4 and a Baume degree of 50.

[0065] The preparation method of the two-component polyurethane composite material provided in this embodiment comprises the following steps: adding polyether polyol, small molecule chain extender and plasticizer to a container, stirring evenly, heating to 95°C, vacuum dehydration for 1h, cooling to 60°C, adding diisocyanate at one time, stirring, keeping warm for 2h at 75°C, adding polyphenyl polymethylene polyisocyanate, stirring for 1h, cooling, filtering and packaging to obtain component A; when in use, component A and component B are mixed evenly in a volume ratio of 1:2 to obtain a mixture. Record the operation time, drying time, and test the compressive strength and tensile strength, which are summarized in Table 1. Among them, the operation time refers to the time from the start of mixing and stirring to the time when it cannot flow, and the drying time refers to the complete curing reaction time.

[0066] Comparative Example 1

[0067] The formula of the two-component polyurethane composite material provided in this comparative example is basically the same as that in Example 1, except that only dimethylolpropionic acid is used as the small molecule chain extender in an amount of 1 part, and the rest remains unchanged.

[0068] Comparative Example 2

[0069] The formula of the two-component polyurethane composite material provided in this comparative example is basically the same as that in Example 1, except that only neopentyl glycol is used as the small molecule chain extender in an amount of 1 part, and the rest remains unchanged.

[0070] Table 1:

[0071] Operation time / min Drying time / min Compressive strength / MPa Tensile strength / MPa Example 1 15 40 52 35 Example 2 13 38 55 36 Example 3 13 43 58 39 Comparative Example 1 14 53 26 13 Comparative Example 2 14 55 24 12 Commercially available materials 11 32 19 14

[0072] It can be seen from the above example data that the operation time and drying time of the two-component polyurethane composite material provided by the present invention are slightly longer, so that the material can be fully infiltrated and convenient for on-site construction. It has excellent compressive strength and tensile strength, and can achieve a good leak plugging and repair effect.

[0073] The above shows and describes the basic principles, main features and characteristics of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. A two-component polyurethane composite material for pipeline repair, characterized in that: The invention comprises component A and component B, wherein component A is prepared from the following raw materials in parts by weight: 30-100 parts of diisocyanate, 80-120 parts of polyether polyol, 200-300 parts of polyphenyl polymethylene polyisocyanate, 1-1.5 parts of small molecule chain extender, and 80-200 parts of plasticizer; The B component is a water-soluble silicate.

2. The two-component polyurethane composite material for pipeline repair according to claim 1, characterized in that: The diisocyanate is toluene diisocyanate or diphenylmethane diisocyanate, or a combination thereof.

3. The two-component polyurethane composite material for pipeline repair according to claim 1, characterized in that: The small molecule chain extender is a mixture of dimethylol propionic acid and neopentyl glycol in a weight ratio of 1:

2.

4. The two-component polyurethane composite material for pipeline repair according to claim 1, characterized in that: The polyphenyl polymethylene polyisocyanate is a polyisocyanate mixture with an NCO content of 30-36%.

5. The two-component polyurethane composite material for pipeline repair according to claim 1, characterized in that: The polyether polyol is polyoxypropylene diol or triol, the molecular weight of the polyether polyol is 2000-5000, and the functionality is 2 or 3.

6. The two-component polyurethane composite material for pipeline repair according to claim 1, characterized in that: The plasticizer is one or more of chlorinated paraffin, dibutyl phthalate and dimethyl phthalate.

7. The two-component polyurethane composite material for pipeline repair according to claim 1, characterized in that: The water-soluble silicate is industrial-grade liquid sodium silicate with a modulus of 2.0-2.6 and a Baume degree of 50-53.

8. A method for preparing the two-component polyurethane composite material for pipeline repair according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: Preparation of component A: Add polyether polyol, small molecule chain extender and plasticizer into a container, stir evenly, heat to 90-100°C, vacuum dehydrate for 1 hour, cool to 60°C, add diisocyanate at one time, stir, keep warm at 75-80°C for 2 hours, then add polyphenyl polymethylene polyisocyanate, stir for 1 hour, cool, filter and package to obtain component A.

9. An application of the two-component polyurethane composite material for pipeline repair according to any one of claims 1 to 7, characterized in that: The application comprises mixing component A and component B in a volume ratio of 1:(1-3) to obtain a mixture, and then spreading the mixture on a glass fiber cloth, ensuring that the mixture is evenly spread and impregnated on the glass fiber cloth; The glass fiber cloth impregnated with the mixture is gently fixed on a special repair airbag, which is then sent to the repair point of the pipeline. The repair airbag is inflated to fill the entire pipeline. After 40-60 minutes, the repair status is checked by a camera. After solidification is confirmed, the pipeline leak is repaired.

10. The use according to claim 9, characterized in that: The density of the glass fiber cloth is 600-1000 g / m2; and / or The weight ratio of the mixture formed by the A component and the B component to the glass fiber cloth is (1.5-1.8):1.