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CN-121975081-A - Sealing material suitable for pipeline encapsulation in low-temperature area and application thereof

CN121975081ACN 121975081 ACN121975081 ACN 121975081ACN-121975081-A

Abstract

The invention discloses a sealing material suitable for pipeline encapsulation in low-temperature areas and application thereof, wherein the pipeline comprises a PCCP pipe or a PCCP-C pipe and the like, the sealing material comprises a special modified bio-based polyol and is used for preparing the sealing material suitable for pipeline sealing, the sealing mode comprises crack pouring, surface coating and the like, the sealing material can be, for example, a bi-component polyurethane sealant, a single-component polyurethane anti-corrosion coating and the like, and the application of the sealing material in the sealing material can shorten the curing time under relatively low humidity, meanwhile, the viscosity of a material body is less increased under low temperature, the proper viscosity can still be kept, the sealing construction and the anti-corrosion construction of a pipeline butt joint part are facilitated, in addition, the mechanical property under low temperature is better, and the sealing material is suitable for areas with long low-temperature time duration.

Inventors

  • WANG XIAOJUN
  • CHEN MING
  • YU YONG
  • MEI BAOLAN
  • PAN WEI
  • SONG GUN
  • XIAO LI
  • KANG JIEFEN

Assignees

  • 新疆水发准水建设开发有限公司
  • 中建材苏州防水研究院有限公司

Dates

Publication Date
20260505
Application Date
20260213

Claims (15)

  1. 1. A bio-based polyol composition for polyurethane, characterized in that the bio-based polyol composition comprises a first unit and a second unit; The first unit comprises a bio-based polyol, and the bio-based polyol is prepared by the following steps of enabling castor oil and peroxy acid to undergo an epoxidation reaction to generate a first intermediate, enabling the first intermediate and a compound shown as a formula (I) to undergo an epoxy ring-opening reaction to generate a second intermediate, and enabling the second intermediate and a compound shown as a formula (II) to undergo an esterification reaction to generate the bio-based polyol; In formula (I), R 1 is selected from C 2-6 alkylene; In formula (II), R 2 、R 3 is independently selected from C 1-3 alkylene, R 4 is selected from C 1-3 alkyl or hydroxy-substituted C 1-3 alkyl; The second unit comprises a compound of formula (III); In formula (III), R 5 、R 6 、R 7 is independently selected from C 2-10 alkylene, double bond interrupted C 2-10 alkylene, epoxy interrupted C 2-10 alkylene, and R 8 、R 9 、R 10 is independently selected from C 2-10 alkyl, alkenyl C 2-10 alkyl, epoxy C 2-10 alkyl, double bond interrupted C 2-10 alkyl, epoxy interrupted C 2-10 alkyl.
  2. 2. The bio-based polyol composition for polyurethane according to claim 1, wherein the epoxidation reaction is performed at 40-60 ℃ and/or in the presence of an alkaline substance, further comprising an alkali metal carbonate and/or an alkali metal hydroxide, in the process of preparing the bio-based polyol; Still further, the alkali metal carbonate comprises sodium carbonate and/or potassium carbonate, and the alkali metal hydroxide comprises sodium hydroxide and/or potassium hydroxide; further, the addition mass of the alkaline substance accounts for 0.01% -0.3% of the addition mass of the castor oil; And/or the number of the groups of groups, The feeding mass ratio of the castor oil to the peroxy acid is 6-8:1; And/or the number of the groups of groups, The peroxyacid comprises trifluoroperoxyacetic acid.
  3. 3. The bio-based polyol composition for polyurethane according to claim 1, wherein the epoxy ring-opening reaction is performed at 120 to 160℃during the preparation of the bio-based polyol, and/or, The epoxy ring-opening reaction is carried out in the presence of a tetraalkyl amine halide, further, the tetraalkyl amine halide comprises tetrabutylammonium bromide, further, the tetraalkyl amine halide is added in an amount of 0.5 to 4.0% by mass based on the added mass of the compound represented by the formula (I), and/or, Controlling the feeding mass ratio of the compound shown in the formula (I) to the castor oil to be 1.05-1.25:1, and/or, In the formula (I), R 1 is selected from ethylene, propylene and butylene.
  4. 4. A bio-based polyol composition for polyurethane according to claim 1, wherein the esterification reaction is carried out at 120 to 160℃in the course of preparing the bio-based polyol, and/or, The esterification reaction is carried out in the presence of an acid, further, the acid comprises trifluoromethanesulfonic acid and/or p-toluenesulfonic acid, still further, the added mass of the acid accounts for 0.1% -2.0% of the total mass of the reaction system, and/or, Controlling the feeding mass ratio of the compound shown in the formula (II) to the castor oil to be 0.5-0.65:1, and/or, In formula (II), R 2 、R 3 is independently selected from methylene, ethylene, propylene, and R 4 is selected from methyl, ethyl, propyl, or hydroxy-substituted methyl.
  5. 5. The bio-based polyol composition for polyurethane according to claim 1, wherein in the formula (III), R 5 、R 6 、R 7 is independently selected from the group consisting of propylene, butylene, pentylene, hexylene, heptylene, octylene, double bond-interrupted pentylene, double bond-interrupted hexylene, double bond-interrupted heptylene, double bond-interrupted octylene, epoxy-interrupted pentylene, epoxy-interrupted hexylene, epoxy-interrupted heptylene, epoxy-interrupted octylene, and R 8 、R 9 、R 10 is independently selected from the group consisting of propyl, butyl, pentyl, hexyl, heptyl, octyl, alkenyl C 3-8 alkyl, epoxy C 3-8 alkyl, double bond-interrupted C 3-8 alkyl, epoxy-interrupted C 3-8 alkyl.
  6. 6. The bio-based polyol composition for polyurethane according to claim 1, wherein the ratio of the first unit to the second unit is 1:0.25 to 0.50 by mass, and/or the compound represented by the formula (I) comprises ethylene glycol, and/or the compound represented by the formula (II) comprises 2, 2-dimethylolpropionic acid, and/or the second unit comprises epoxidized soybean oil.
  7. 7. A polyurethane sealant, characterized in that the polyurethane sealant comprises an A component and a B component; the raw materials of the A component comprise a polyol, the bio-based polyol composition for polyurethane according to any one of claims 1 to 6, and a polyisocyanate; The raw materials of the component B comprise a chain extender, a cross-linking agent, the bio-based polyol composition for polyurethane according to any one of claims 1 to 6, a filler and a catalyst.
  8. 8. The polyurethane sealant according to claim 7, wherein in the A component, 70 to 80 parts by weight of the polyol, 5 to 10 parts by weight of the bio-based polyol composition for polyurethane according to any one of claims 1 to 6, 10 to 20 parts by weight of the isocyanate, and/or, In parts by weight, in the component B, 5 to 10 parts of a chain extender, 60 to 70 parts of a crosslinking agent, 5 to 10 parts of the bio-based polyol composition for polyurethane according to any one of claims 1 to 6, 10 to 20 parts of a filler, 0.1 to 0.5 part of a catalyst, and/or, The feeding mass ratio of the component A to the component B is 1:0.8-1.2.
  9. 9. A polyurethane sealant according to claim 7, wherein in the A component, the polyol is polyether diol and/or polyether triol, further wherein the average molecular weight of the polyether diol is 2000-6000, the average molecular weight of the polyether triol is 3000-8000, and/or, The component A comprises polyisocyanate, and further comprises one or a combination of more selected from toluene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate and hexamethylene diisocyanate, and/or, In the component B, the chain extender comprises a sterically hindered amine chain extender, further, the sterically hindered amine chain extender comprises one or more selected from the group consisting of dimethyl thiotoluene diamine, 4' -di (alkylamino) -diphenylmethane, N ' -dialkylphenylenediamine, 4' -di (alkylamino) -dicyclohexylmethane and polyaspartic acid ester, and/or, In the component B, the cross-linking agent is selected from polyether triol with average molecular weight of 3000-8000 and/or, In the component B, the filler is selected from one or a combination of more of calcium carbonate, kaolin, talcum powder and mica powder.
  10. 10. The polyurethane sealant according to claim 7, wherein in the component B, the catalyst is composed of an organobismuth catalyst and an amine catalyst, further, the organobismuth catalyst comprises bismuth isooctanoate and/or bismuth neodecanoate, the amine catalyst comprises triethylene diamine and/or dimethylaminoethyl ether, and further, the feeding mass ratio of the organobismuth catalyst to the amine catalyst is 1:0.5-2.
  11. 11. A one-component polyurethane anticorrosive paint, characterized in that raw materials of the one-component polyurethane anticorrosive paint comprise the bio-based polyol composition for polyurethane according to any one of claims 1 to 6, polyisocyanate with the mass content of NCO groups being 20% or more, a filler, an anti-sagging auxiliary agent, a composite catalyst and a solvent; the composite catalyst consists of a main catalyst and a cocatalyst, wherein the main catalyst is dibutyl tin dilaurate and/or stannous octoate, and the cocatalyst is N, N-dimethyl cyclohexylamine.
  12. 12. The single-component polyurethane anticorrosive paint according to claim 11, wherein the single-component polyurethane anticorrosive paint comprises, by weight, 30-50 parts of bio-based polyol, 15-25 parts of polyisocyanate with the mass content of NCO groups being 20% or more, 6-10 parts of compound shown in formula (III), 10-20 parts of filler, 2-5 parts of anti-sagging auxiliary agent, 0.3-1.5 parts of composite catalyst and 5-20 parts of solvent.
  13. 13. The one-component polyurethane anticorrosive paint according to claim 11, wherein the mass ratio of the main catalyst to the cocatalyst in the composite catalyst is 2-3:1, and/or, The filler comprises nano silicon dioxide and talcum powder, and further, in the filler, the feeding mass ratio of the nano silicon dioxide to the talcum powder is 1:3-5.
  14. 14. The one-component polyurethane anticorrosive paint according to claim 11, wherein the polyisocyanate is polymethylene polyphenyl isocyanate and/or hexamethylene diisocyanate trimer, and/or the sag resistance aid is one or a combination of more selected from hydrogenated castor oil, polyamide wax and fumed silica, and/or the solvent is a mixed solvent of anhydrous toluene and ethyl acetate according to a mass ratio of 1:1-2.
  15. 15. Use of a polyurethane sealant according to any one of claims 7 to 10 or a one-component polyurethane anticorrosive paint according to any one of claims 11 to 14 for potting of pipes in low temperature areas.

Description

Sealing material suitable for pipeline encapsulation in low-temperature area and application thereof Technical Field The invention relates to the technical field of PCCP pipe faucet sealing, in particular to a sealing material suitable for sealing a pipeline in a low-temperature area and application thereof. Background The prestressed steel cylinder concrete pipe (PRESTRESSED CONCRETE CYLINDER PIPE, PCCP for short) is a composite pipe material formed by compositing various materials such as high-strength prestressed steel wires, steel cylinders, concrete, cement mortar and the like, combines the rigidity of the concrete, the tensile property of the steel and the like, and has remarkable advantages in large-caliber (for example, the pipe diameter can be 2-5 meters and the like), high-pressure and long-distance hydrophobic engineering. At present, PCCP pipelines are widely applied to hydraulic engineering in northwest arid regions, the sealing and corrosion-resistant quality of the butt joint parts of the pipelines directly influence the overall performance of the pipelines, and once the pipelines are damaged, moisture, sulfate, chloride ions and the like can invade, corrode prestressed steel wires and influence the service life of the PCCP pipelines. The environment of the areas is relatively special, the relative humidity is low (can be lower than 30%, and can be even lower than 10% -15% in partial areas), the ultraviolet rays are strong in daytime and the low-temperature time is long, for example, the duration time in winter in some northern areas can be as long as 4-5 months, so that the selection of sealing or anti-corrosion materials suitable for the areas is important, for example, the characteristics of good low-temperature performance, good weather resistance, high curing speed under low-temperature and low-humidity conditions, easiness in construction under low temperature and the like are required. Polyurethane high molecular materials (such as paint or adhesive) are generally classified into two basic types, namely a single-component polyurethane material and a two-component polyurethane material, wherein the single-component polyurethane material is of a moisture-curing type, and the two-component polyurethane material is of a reaction-curing type. The single-component polyurethane material has the characteristics of convenient construction, slower solidification and relatively higher solidification speed, but needs to be prepared when in use. Under different scenes, single components or double components can be selected in theory respectively, but in practice, in some relatively harsh environments, for example, in the areas with lower relative humidity and longer low-temperature environment time all the year round, the environmental suitability is the problem that needs to be considered or solved mainly for polyurethane materials, and the characteristics of good low-temperature performance, good weather resistance, high curing speed under low-temperature and low-humidity conditions, easy construction under low temperature and the like of some polyurethane materials commonly used at present are difficult to be simultaneously considered, so that the problems exist. It should be noted that the information disclosed in the above background section is only for understanding the background of the present application, and thus the background section of the present application may contain background information about the problem or environment of the present application, not necessarily describe the prior art. Accordingly, inclusion in the background section is not an admission of prior art by the applicant. Disclosure of Invention The invention aims to overcome one or more defects in the prior art and provide an improved bio-based polyol composition for polyurethane, which can obtain excellent comprehensive performance in the environment with relatively low humidity and long low-temperature environment time when being used for a two-component polyurethane sealant and a one-component polyurethane anticorrosive paint. In order to achieve the above purpose, the invention adopts a technical scheme that: A bio-based polyol composition for polyurethane, the bio-based polyol composition comprising a first unit and a second unit; The first unit comprises a bio-based polyol, and the bio-based polyol is prepared by the following steps of enabling castor oil and peroxy acid to undergo an epoxidation reaction to generate a first intermediate, enabling the first intermediate and a compound shown as a formula (I) to undergo an epoxy ring-opening reaction to generate a second intermediate, and enabling the second intermediate and a compound shown as a formula (II) to undergo an esterification reaction to generate the bio-based polyol; In formula (I), R 1 is selected from C 2-6 alkylene; In formula (II), R 2、R3 is independently selected from C 1-3 alkylene, R 4 is selected from C 1-3 alkyl or hydroxy-substituted C 1-