CN104479099A - Low-viscosity high-early-strength polyurethane repair material for high speed railway slab ballastless track filling layer open joint repair - Google Patents
Low-viscosity high-early-strength polyurethane repair material for high speed railway slab ballastless track filling layer open joint repair Download PDFInfo
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Abstract
The invention discloses a low-viscosity high-early-strength polyurethane repair material for high speed railway slab ballastless track filling layer open joint repair. The repair material consists of two parts, namely a part A and a part B, wherein the part A consists of the following raw materials in parts by mass: 100 parts of isocyanate and prepolymers thereof; the part B consists of the following raw materials in parts by mass: 60-80 parts of reactive hydrogen oligomer, 40-70 parts of a plasticizer, 0.5-2 parts of a defoaming agent and 0.1-1 part of an anti-aging agent; and the volume ratio of the part A to the part B is 1:1. The polyurethane open joint repair material has the advantages of low viscosity, high curing speed, high mechanical strength, high adhesive strength, high toughness and excellent durability, can meet the requirements on rapid construction in skylight time and instant traffic service after repair and can be used for rapid maintenance of the operating high speed railway slab ballastless track structure.
Description
Technical field
The invention belongs to high-speed railway work business maintenance field, be specifically related to the high early strong polyurethane repair material of a kind of high-speed railway plate type ballastless track filling bed gap repairing low viscosity.
Background technology
Plate-type ballastless track has the features such as orbital forcing is high, rigidity good uniformity, stability are strong because of it, becomes the primary trace structural shape that China's speed per hour 300 kilometers of high-speed railways adopt.The high-speed railways such as China is Beijing-Shanghai, Beijing-to-Shijiazhuang is military, Beijing-Tianjin, Tianjin Qin, Harbin-to-Dalian, Shanghai and Nanjing, Shanghai-Hangzhou, Ningbo-Hangzhou, Hangzhou-Zhejiang, conjunction freshwater mussel all adopt platy ballastless track structure.Platy ballastless track structure is primarily of formations such as precast track plate, filling bed, concrete bed or hydraulicity supporting courses, CRTS I-type plate-type ballastless track structure middle orbit plate adopts modular construction, and CRTS II plate-type non-fragment orbit middle orbit plate adopts vertical connection structure.Between track plates and base the major function of filling bed be filling, support, load, power transmission and suitable malleable is provided.The cement emulsified asphalt mortar of the filling bed employing of CRTS I-type plate-type non-fragment orbit and CRTS II plate-type non-fragment orbit, what CRTS type III platy ballastless track structure and roadbed section track switch platy ballastless track structure filling bed adopted is self-compacting concrete.
Filling bed gap is one of main hurt form of platy ballastless track structure, gap refer to pour into sclerosis there is crack between filling bed and track plates or bed-plate.Through finding the Field Research of opening plate-type ballastless track line filling bed gap situation, the most easily there is gap in the mortar that track plates vertex angle part divides, and gap width does not wait from 0.5mm to 5mm and changes along with the change of envrionment temperature thereupon.After filling bed produces gap, be that the rainwater on track plates can flow into gap gap along track plates periphery on the one hand, thus form ponding layer between filling bed and track plates or bed-plate; Be on the other hand that vertical acceleration and the displacement of gap state lower railway plate increases, thus strengthen when bullet train runs track plates to the Impact Load of slurry placement layer.Under the alternate cycles effect of repeated stock load, hydrodynamic pressure and temperature variation when bullet train runs, the gap in filling bed constantly produces, expand and extension, is finally communicated with into network of fracture, causes filling bed to occur cracked.Therefore, need to use bonding cohesive strength high, the low easy filling of viscosity, the high-performance patching material that mechanical strength and toughness are taken into account is repaired filling bed gap.Meanwhile, in order to realize the quick reparation completing ballastless track structure in Window time, material also should possess fast setting, high early strong feature.
Inorganic patching material viscosity is large, cannot fill tiny gap, and the cohesive strength of inorganic materials is lower, cannot meet the technical requirements that filling bed gap is repaired.Current high-performance patching material, based on macromolecular material, mainly comprises epoxy resin, crylic acid resin and polyurethanes.Epoxy resin viscosity is high, rigidity large, although can add solvent to reduce viscosity, can have a strong impact on the gelation rate of material, cannot meet fast setting, high early strong requirement; Acrylic resin poor toughness, under the effect of long-term DYNAMIC LOADING OF DRIVING TRAIN ON BRIDGES lotus, easily cracking is even broken, and it has irritating smell and corrodibility, and the feature of environmental protection is poor; Polyurethane material has special micro phase separation structure, has good snappiness while can keeping certain mechanical strength, likely repairs for ballastless track of high-speed railway filling bed gap.But polyurethane repair materials application conventional is at present in the repairing of ballastless track of high-speed railway filling bed gap, and still there are the following problems:
1. early strength is low: although existing polyurethane repair material is by regulating catalyzer fast reaction speed, premature curing degree promotes limited, and early stage mechanical strength is low, the needs be immediately open to traffic after cannot meeting repairing.
2. viscosity is high: the viscosity of existing polyurethane repair material is higher, general at more than 500mPas, gap cannot be filled full by (≤20min) at short notice, simultaneously, the viscosity of material increases in time and increases, mobility significantly reduces, and gap inside there will be more hole region, has a strong impact on repairing quality.
3. snappiness is poor: existing polyurethane repair material is to embody mechanical strength, and snappiness is lower, when being subject to DYNAMIC LOADING OF DRIVING TRAIN ON BRIDGES lotus and Lateral Force for a long time, easily brittle rupture occurs.
4. environmental compatibility is poor: when lesser temps (5 ~ 15 DEG C), and the speed of response of polyurethane repair material declines, and cannot meet Rapid-Repair needs; Large or the gap of atmospheric moisture inner moist time, polyurethane repair material easily foams, and green bond is low, and repair efficiency declines obviously.
Summary of the invention
Goal of the invention: the object of the invention is to solve the deficiencies in the prior art, provides the high early strong polyurethane repair material of a kind of high-speed railway plate type ballastless track filling bed gap repairing low viscosity.
Technical scheme: in order to realize above object, the invention provides the high early strong polyurethane repair material of a kind of high-speed railway plate type ballastless track filling bed gap repairing low viscosity, this material is by A, B two portions form, part A is made up of the raw material of following masses number: isocyanic ester and prepolymer 100 parts thereof, described isocyanic ester is PAPI, one or both in Carbodiimide-Modified MDI, isocyanate prepolymer be the NCO content prepared of isocyanic ester and dibasic alcohol 22% ~ 28% prepolymer, wherein isocyanic ester is IPDI, one or both in XDI, dibasic alcohol be molecular weight 400 ~ 800 hydroxy-terminated polybutadienes resin, EO content is lower than one or both in the polyoxyethylene-propylene oxide polyol of 8%, 20 ~ 50 parts, softening agent, part B is made up of the raw material of following masses number: reactive hydrogen oligopolymer 60 ~ 80 parts, described reactive hydrogen oligopolymer is one or more in low viscosity epoxy resin, Synolac, oil chemistry polyvalent alcohol, 40 ~ 70 parts, softening agent, defoamer 0.5 ~ 2 part, 0.1 ~ 1 part, anti-aging agent, the two-part volume ratio of A, B is 1: 1.
Above-mentioned softening agent is one or more in dioctyl sebacate, tributyl phosphate, di(2-ethylhexyl)phosphate isooctyl; Defoamer is silicone based defoamer; Anti-aging agent is one or more in photostabilizer, oxidation inhibitor and hydrolysis stabilizer.
Above-mentioned low viscosity early-strength type mortar gap patching material performance meets viscosity≤50mPas, gel time≤30min, 2h tensile strength >=10MPa, 24h tensile strength >=15MPa, 7d tensile strength >=20MPa, 2h compressive strength >=10MPa, 24h compressive strength >=20MPa, 7d compressive strength >=30MPa, 7d elongation at break >=20%, 7d shrinking percentage≤2%, 7d cohesive strength >=5MPa, 7d green bond >=3MPa, thermal ageing process, the requirement of velocity of variation≤10% of alkaline purification and ultraviolet ageing process back draft intensity and compressive strength, do not foam when this material uses in humid conditions simultaneously.
Above-mentioned a kind of polyurethane caulking material, its using method for: it is in two component slip casting machines of 1: 1 that A described in claim 1, B component are loaded volume ratio, direct slip casting.
Working mechanism: in order to reduce component A viscosity, polyurethane repair material multiselect monomeric aromatic isocyanate, but the kindliness and ageing resistance that reduce material largely can be fallen like this.Therefore, the prepolymer selecting the low viscosity aliphatic isocyanates of ageing-resistant performance excellence and the dibasic alcohol of linear low molecular weight to prepare and monomeric aromatic isocyanate used in combination, both ensure that material had low viscosity, turn increased its kindliness and ageing-resistant performance.Hydroxy-terminated polybutadienes resin can significantly improve the mechanical property of material, adhesive property and ageing-resistant performance, suitably add EO content lower than 8% polyoxyethylene-propylene oxide polyol, when material over-all properties base keeps this constant, material cost can be reduced.B component selects low viscosity epoxy resin, Synolac, oil chemistry polyvalent alcohol to substitute conventional polyether polyvalent alcohol as reactive component, viscosity of material can be reduced, improve mechanical strength and kindliness, obviously improve adhesive property and the ageing resistance of material, realize high early strong requirement.Do not use chain extension-crosslinking agent, avoid alcohol micromolecular and easily absorb water and cause foaming materials and amine small molecules speed of response is too fast, material stiffness is excessive problem.Meanwhile, above-mentioned reactive hydrogen oligopolymer reactive behavior is high, without the need to catalyzer, can realize fast setting, and significantly inhibit the reaction of isocyanic ester and water, can use at the larger environment of humidity or damping interface.Zero catalyst levels, the environmental-protecting performance of urethane gap patching material significantly improves.
Beneficial effect: the high early strong polyurethane repair material of a kind of ballastless track of high-speed railway mortar gap repairing low viscosity provided by the invention, through lot of experiments research, each component proportioning of this component is scientific and reasonable, and said composition has the performance of following excellence:
(1) construct convenient: this patching material use volume ratio be 1: 1 the slip casting of two component slip casting machine.
(2) concrete castability is excellent: can fill area in 20min and be about 16m
2, wide be the gap of 0.5mm ~ 5mm.
(3) early stage mechanical strength is high: gel time≤30min, 2h tensile strength and compressive strength are all at more than 10MPa a.
(4) snappiness is good: under long-term train fatigue load and Lateral Force, brittle rupture does not occur.
(5) ageing-resistant performance is good: heat-proof aging, alkaline-resisting and anti-ultraviolet ageing performance is excellent, after thermal treatment, alkaline purification and ultraviolet ageing, and velocity of variation≤10% of tensile strength and elongation at break.
(6) environmental compatibility is strong: the large or gap of atmospheric moisture inner moist time all can use, material does not foam, and green bond is high.
Embodiment
With embodiment, embodiment is described below, these embodiments are only limitted to explain and the present invention are described, and do not limit scope of the present invention.
Polyurethane repair material preparation process is as follows:
Component A preparation technology:
(1) dibasic alcohol is added in reactor, under (120 ± 5) DEG C condition, vacuum (vacuum tightness≤-0.9MPa) is dewatered 2h, test its water ratio, as water ratio≤0.05%, then by near for mixeding liquid temperature less than 70 DEG C, dehydration is then continued, till meeting the demands if do not met.When near less than 70 DEG C of mixeding liquid temperature, add aliphatic isocyanates, and its temperature is adjusted to (90 ± 5) DEG C, prepolymer isocyanate content is tested after reaction 90min, as met design load ± 0.2%, then prepolymer being cooled to less than 50 DEG C, then continuing reaction, till meeting the demands if do not met.
(2) when near less than 50 DEG C of prepolymer temperature, add after softening agent vacuum (vacuum tightness≤-0.9MPa) stirs deaeration 90min, discharging sealing is preserved.
B component preparation technology:
(1) reactive hydrogen oligopolymer is added in reactor, under (120 ± 5) DEG C condition, vacuum (vacuum tightness≤-0.9MPa) is dewatered 2h, test its water ratio, as water ratio≤0.05%, then by near for mixed solution material temperature degree less than 50 DEG C, dehydration is then continued, till meeting the demands if do not met.
(2), when near less than 50 DEG C of temperature, after adding the mixing such as softening agent, defoamer, anti-aging agent, after vacuum (vacuum tightness≤-0.9MPa) stirs deaeration 90min, discharging sealing is preserved.
Embodiment 1
The composition of urethane gap patching material:
Component A is made up of the raw material of following parts by weight: IPDI 10 parts and polyurethane repair material 20 parts of isocyanate content prepared are the prepolymer of 22%, PAPI 70 parts, dioctyl sebacate 20 parts;
Part B is made up of the raw material of following parts by weight: low viscosity epoxy resin 10 parts, Synolac 40 parts, oil chemistry polyvalent alcohol 10 parts, tributyl phosphate 20 parts, di(2-ethylhexyl)phosphate isooctyl 20 parts, defoamer BYK-066 0.5 part, photostabilizer 0.02 part, 0.03 part, oxidation inhibitor, hydrolysis stabilizer 0.05 part;
The two-part volume ratio of A, B is 1: 1.
Embodiment 2
The composition of urethane gap patching material:
Component A is made up of the raw material of following parts by weight: XDI 15 parts is the prepolymer of 28% with hydroxy-terminated polybutadienes resin 10 parts and polyoxyethylene-propylene oxide polyol 20 parts isocyanate content prepared, Carbodiimide-Modified MDI55 part, tributyl phosphate 25 parts, dioctyl sebacate 25 parts;
Part B is made up of the raw material of following parts by weight: low viscosity epoxy resin 15 parts, Synolac 45 parts, oil chemistry polyvalent alcohol 20 parts, tributyl phosphate 30 parts, di(2-ethylhexyl)phosphate isooctyl 40 parts, defoamer BYK-070 2 parts, photostabilizer 0.3 part, 0.5 part, oxidation inhibitor, hydrolysis stabilizer 0.2 part.
The two-part volume ratio of A, B is 1: 1.
Embodiment 3
The composition of urethane gap patching material:
Component A is made up of the raw material of following parts by weight: XDI 5 parts is the prepolymer of 25% with polyoxyethylene-propylene oxide polyol 10 parts isocyanate content prepared, Carbodiimide-Modified MDI 30 parts, PAPI 55 parts, dioctyl sebacate 70 parts;
Part B is made up of the raw material of following parts by weight: low viscosity epoxy resin 5 parts, Synolac 35 parts, oil chemistry polyvalent alcohol 30 parts, tributyl phosphate 20 parts, di(2-ethylhexyl)phosphate isooctyl 35 parts, defoamer BYK-088 1.25 parts, photostabilizer 0.3 part, 0.15 part, oxidation inhibitor, hydrolysis stabilizer 0.1 part.
The two-part volume ratio of A, B is 1: 1.
Embodiment 4
The composition of urethane gap patching material:
Component A is made up of the raw material of following parts by weight: IPDI 10 parts is the prepolymer of 23% with hydroxy-terminated polybutadienes resin 15 parts and polyoxyethylene-propylene oxide polyol 25 parts isocyanate content prepared, Carbodiimide-Modified MDI50 part, dioctyl sebacate 35 parts, di(2-ethylhexyl)phosphate isooctyl 30 parts;
Part B is made up of the raw material of following parts by weight: low viscosity epoxy resin 5 parts, Synolac 30 parts, oil chemistry polyvalent alcohol 30 parts, tributyl phosphate 10 parts, di(2-ethylhexyl)phosphate isooctyl 35 parts, defoamer BYK-066 1.6 parts, photostabilizer 0.15 part, 0.1 part, oxidation inhibitor, hydrolysis stabilizer 0.05 part.
The two-part volume ratio of A, B is 1: 1.
Embodiment 5
The composition of urethane gap patching material:
Component A is made up of the raw material of following parts by weight: XDI 5 parts is the prepolymer of 27% with hydroxy-terminated polybutadienes resin 5 parts and polyoxyethylene-propylene oxide polyol 10 parts isocyanate content prepared, PAPI 80 parts, dioctyl sebacate 30 parts, di(2-ethylhexyl)phosphate isooctyl 32 parts;
Part B is made up of the raw material of following parts by weight: low viscosity epoxy resin 10 parts, Synolac 40 parts, oil chemistry polyvalent alcohol 25 parts, di(2-ethylhexyl)phosphate isooctyl 65 parts, defoamer BYK-066 0.2 part, defoamer BYK-088 0.6 part, photostabilizer 0.4 part, 0.2 part, oxidation inhibitor, hydrolysis stabilizer 0.2 part.
The two-part volume ratio of A, B is 1: 1.
Embodiment 6
The composition of urethane gap patching material:
Component A is made up of the raw material of following parts by weight: IPDI 5 parts is the prepolymer of 24% with hydroxy-terminated polybutadienes resin 10 parts and polyoxyethylene-propylene oxide polyol 10 parts isocyanate content prepared, XDI 5 parts is the prepolymer of 26% with hydroxy-terminated polybutadienes resin 5 parts and polyoxyethylene-propylene oxide polyol 10 parts isocyanate content prepared, PAPI 20 parts, Carbodiimide-Modified MDI 15 parts, dioctyl sebacate 77 parts;
Part B is made up of the raw material of following parts by weight: low viscosity epoxy resin 13 parts, Synolac 47 parts, oil chemistry polyvalent alcohol 17 parts, di(2-ethylhexyl)phosphate isooctyl 50 parts, defoamer BYK-066 1.5 parts of photostabilizers 0.15 part, 0.25 part, oxidation inhibitor, hydrolysis stabilizer 0.2 part.
The two-part volume ratio of A, B is 1: 1.
In example 1 ~ 6, dual-component polyurethane gap patching material test-results is as shown in table 1 below, and its medium viscosity is tested according to GB/T 2794; Gel time is tested according to GB/T 7193; Tensile strength, elongation at break are tested according to GB/T 2567; Ultimate compression strength, cohesive strength are tested according to JC/T 1041; Shrinking percentage, by measuring the density (GB/T 1033.1) of liquidus density (GB/T 13354) and shaping hardening thing, calculates; Thermal ageing process, alkaline purification and ultraviolet ageing treatment process perform according to GB/T 16777:
Table 1 embodiment material property
Claims (5)
1. a high-speed railway plate type ballastless track filling bed gap is repaired with the high early strong polyurethane repair material of low viscosity, it is characterized in that: this material is by A, B two portions form, part A is made up of the raw material of following masses number: isocyanic ester and prepolymer 100 parts thereof, described isocyanic ester is PAPI, one or both in Carbodiimide-Modified MDI, isocyanate prepolymer be the NCO content prepared of isocyanic ester and dibasic alcohol 22% ~ 28% prepolymer, wherein isocyanic ester is IPDI, one or both in XDI, dibasic alcohol be molecular weight 400 ~ 800 hydroxy-terminated polybutadienes resin, EO content is lower than one or both in the polyoxyethylene-propylene oxide polyol of 8%, 20 ~ 50 parts, softening agent, part B is made up of the raw material of following masses number: reactive hydrogen oligopolymer 60 ~ 80 parts, described reactive hydrogen oligopolymer is one or more in low viscosity epoxy resin, Synolac, oil chemistry polyvalent alcohol, 40 ~ 70 parts, softening agent, defoamer 0.5 ~ 2 part, 0.1 ~ 1 part, anti-aging agent, the two-part volume ratio of A, B is 1: 1.
2. the high early strong polyurethane repair material of a kind of low viscosity according to claim 1, is characterized in that: described softening agent is one or more in dioctyl sebacate, tributyl phosphate, di(2-ethylhexyl)phosphate isooctyl.
3. the high early strong polyurethane repair material of a kind of low viscosity according to claim 1, is characterized in that described defoamer is silicone based defoamer.
4. the high early strong polyurethane repair material of a kind of low viscosity according to claim 1, is characterized in that: described anti-aging agent is one or more in photostabilizer, oxidation inhibitor and hydrolysis stabilizer.
5. according to the high early strong polyurethane repair material of the low viscosity in claim 1-4 described in any one, it is characterized in that: described low viscosity early-strength type mortar gap patching material performance meets viscosity≤50mPas, gel time≤30min, 2h tensile strength >=10MPa, 24h tensile strength >=15MPa, 7d tensile strength >=20MPa, 2h compressive strength >=10MPa, 24h compressive strength >=20MPa, 7d compressive strength >=30MPa, 7d elongation at break >=20%, 7d shrinking percentage≤2%, 7d cohesive strength >=5MPa, 7d green bond >=3MPa, thermal ageing process, the requirement of velocity of variation≤10% of alkaline purification and ultraviolet ageing process back draft intensity and compressive strength, do not foam when this material uses in humid conditions simultaneously.
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| CN201410654891.2A CN104479099B (en) | 2014-11-18 | 2014-11-18 | Low-viscosity high-early-strength polyurethane repair material for high speed railway slab ballastless track filling layer open joint repair |
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| CN105484110A (en) * | 2015-11-24 | 2016-04-13 | 北京瑞威铁科高铁工程有限公司 | Renovating method for gaps and mud spillover between CRTSI template type ballastless track base plate and surface layer of roadbed of high-speed railway |
| CN106632984A (en) * | 2016-12-21 | 2017-05-10 | 中国铁道科学研究院铁道建筑研究所 | High-speed railway ballast track ballast bed surface cementing material |
| CN108863162A (en) * | 2018-06-01 | 2018-11-23 | 苏州睿烁环境科技有限公司 | A kind of preparation method and application of the brickwork joint healant for building ground |
| CN109942779A (en) * | 2019-04-02 | 2019-06-28 | 中建材中岩科技有限公司 | High-speed rail non-fragment orbit off-seam repairs slurries and preparation method thereof |
| CN111592293A (en) * | 2019-06-20 | 2020-08-28 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Rapid repair material and process for CRTSI (China railway track System) type slab ballastless track mortar damage |
| CN111621256A (en) * | 2020-06-12 | 2020-09-04 | 中国铁道科学研究院集团有限公司金属及化学研究所 | Rapid maintenance material and preparation method thereof |
| CN112159511A (en) * | 2020-09-15 | 2021-01-01 | 山东省交通科学研究院 | Polyether polyurethane grouting material and method for treating grout pumping diseases of asphalt pavement |
| CN113480714A (en) * | 2021-07-29 | 2021-10-08 | 山东润义金新材料科技股份有限公司 | Epoxy resin modified polyurethane reinforcing material and preparation method thereof |
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| CN109942779B (en) * | 2019-04-02 | 2021-10-22 | 中建材中岩科技有限公司 | High-speed rail ballastless track open joint repairing slurry and preparation method thereof |
| CN111592293A (en) * | 2019-06-20 | 2020-08-28 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Rapid repair material and process for CRTSI (China railway track System) type slab ballastless track mortar damage |
| JP2021187930A (en) * | 2020-05-28 | 2021-12-13 | 日本特殊塗料株式会社 | Polyurethane clear filler and filling method |
| JP7420646B2 (en) | 2020-05-28 | 2024-01-23 | 日本特殊塗料株式会社 | A method of filling gaps, cracks, dents, electrical distribution boxes, and piping joints in structures with polyurethane clear filler. |
| CN111621256A (en) * | 2020-06-12 | 2020-09-04 | 中国铁道科学研究院集团有限公司金属及化学研究所 | Rapid maintenance material and preparation method thereof |
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| CN112159511A (en) * | 2020-09-15 | 2021-01-01 | 山东省交通科学研究院 | Polyether polyurethane grouting material and method for treating grout pumping diseases of asphalt pavement |
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