CN112063033B - Cold-resistant fastener composition for ballastless track, cold-resistant fastener material for ballastless track and preparation method of cold-resistant fastener material - Google Patents
Cold-resistant fastener composition for ballastless track, cold-resistant fastener material for ballastless track and preparation method of cold-resistant fastener material Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
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- C08L2205/00—Polymer mixtures characterised by other features
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- C08L2207/062—HDPE
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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Abstract
The invention relates to the field of accessory materials for ballastless tracks and discloses a cold-resistant fastener composition for ballastless tracks, a cold-resistant fastener material for ballastless tracks and a preparation method thereof. The composition comprises a base resin, a reinforcing resin and a filler, wherein the base resin is an ethylene-vinyl acetate copolymer, the reinforcing resin is high-density polyethylene and/or low-density polyethylene, and the filler is one or more of calcium stearate, zinc oxide and chlorinated polyethylene. The cold-resistant fastener for the ballastless track prepared by the method has excellent low-temperature resistance, the ratio of dynamic stiffness to static stiffness meets the national standard requirement, and the cold-resistant fastener has excellent mechanical property.
Description
Technical Field
The invention relates to the field of accessory materials for ballastless tracks, in particular to a cold-resistant fastener composition for ballastless tracks, a cold-resistant fastener material for ballastless tracks and a preparation method thereof.
Background
At present, EPDM, SBR, NR, EVA and the like are mostly adopted as main materials of the vibration damping base plate of the domestic rail transit line, rubber, nylon, Polyurethane (PU) and the like are mostly adopted as fasteners, and the product is difficult to meet the requirements of high strength, high durability, low temperature resistance and the like of a high-speed railway. The derailment coefficient of the high-speed train in operation is increased, and the train operation safety is reduced. In northern areas of China, the temperature difference in one year is nearly 70 ℃, severe cold drying is long in winter, the average temperature in the coldest month is lower than-20 ℃, the lowest temperature in the extreme is nearly-40 ℃, the maximum freezing depth is 2.72m, and the rail fastener belongs to the severe cold areas, so that the rail fastener has high requirements on cold resistance. With the rapid development of high-speed railways in China, the requirements of high bearing capacity, high quality and less maintenance of passenger dedicated lines are met. The rail fastener with the characteristics of good durability, cold resistance, shock absorption and the like is particularly important.
Therefore, the method has important significance for research and development of the fastener for the ballastless track.
Disclosure of Invention
The invention aims to overcome the defect of poor cold resistance in the prior art, and provides a cold-resistant fastener composition for a ballastless track, a cold-resistant fastener material for the ballastless track and a preparation method thereof.
In order to achieve the above object, the invention provides a cold-resistant fastener composition for a ballastless track, wherein the composition comprises a base resin, a reinforcing resin and a filler, wherein the base resin is an ethylene-vinyl acetate copolymer, the reinforcing resin is high-density polyethylene and/or low-density polyethylene, and the filler is one or more of calcium stearate, zinc oxide and chlorinated polyethylene.
The invention provides a preparation method of a cold-resistant fastener material for a ballastless track, wherein the method comprises the following steps: mixing the composition and extruding for granulation; preferably, the extrusion granulation conditions include: the temperature is 150 ℃ to 210 ℃, more preferably 160 ℃ to 200 ℃.
The third invention provides the cold-resistant fastener material for the ballastless track prepared by the preparation method, and preferably, the low-temperature brittle temperature of the cold-resistant fastener material for the ballastless track can reach less than or equal to-70 ℃ and the shore hardness>90A, tensile strength of not less than 10Mpa, volume resistivity of not less than 10 8 And the ratio of dynamic stiffness to static stiffness is less than or equal to 1.5.
Through the technical scheme, the cold-resistant fastener for the ballastless track prepared by the method has excellent low-temperature resistance and good mechanical property.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides a cold-resistant fastener composition for a ballastless track, which comprises a base resin, a reinforcing resin and a filler, wherein the base resin is an ethylene-vinyl acetate copolymer, the reinforcing resin is high-density polyethylene and/or low-density polyethylene, and the filler is one or more of calcium stearate, zinc oxide and chlorinated polyethylene.
According to the present invention, the base resin may be used in an amount of 30 to 90 parts by weight, the reinforcing resin may be used in an amount of 10 to 60 parts by weight, and the filler may be used in an amount of 0.1 to 0.5 parts by weight.
According to the invention, when the cold-resistant fastener composition for the ballastless track contains the filler, the weather resistance of the prepared fastener can be improved.
According to the present invention, in order to provide excellent cold resistance for the cold-resistant fastener for the ballastless track, the inventors of the present invention conducted studies on the amounts of the respective components in the cold-resistant fastener composition for the ballastless track, and found through the studies that although the object of the present invention can be achieved to some extent as long as the base resin and the reinforcing resin are contained and the above proportional relationship is satisfied, preferably, the base resin is used in an amount of 40 to 80 parts by weight, the reinforcing resin is used in an amount of 15 to 55 parts by weight, and the filler is used in an amount of 0.1 to 0.2 parts by weight, the cold resistance of the cold-resistant fastener for the ballastless track is better.
According to the present invention, the base resin may be an ethylene-vinyl acetate copolymer, wherein the content of a vinyl acetate structural unit may be 5 to 25% by weight, and the content of an ethylene structural unit may be 75 to 95% by weight, based on the total weight of the ethylene-vinyl acetate copolymer; preferably, the content of the vinyl acetate structural unit is 10-20 wt% and the content of the ethylene structural unit is 80-90 wt% based on the total weight of the ethylene-vinyl acetate copolymer; in the present invention, the ethylene structural unit means a structural unit derived from ethylene, and the vinyl acetate structural unit means a structural unit derived from vinyl acetate.
According to the present invention, the ethylene-vinyl acetate copolymer has a melt index of 1 to 20g/10min, preferably 2 to 8g/10min, under a load of 2.16kg at 190 ℃.
According to the present invention, the reinforcing resin may be high density polyethylene and/or low density polyethylene, wherein the density of the high density polyethylene may be 0.95 to 0.97g/cm 3 Preferably 0.951 to 0.965g/cm 3 (ii) a The high density polyethylene has a melt index of 0.1-20g/10min, preferably 0.5-14.5g/10min at 190 ℃ under a load of 2.16 kg; wherein the low density polyethylene may have a density of 0.91 to 0.94g/cm 3 Preferably 0.92 to 0.935g/cm 3 (ii) a The low density polyethylene may have a melt index at 190 ℃ under a load of 2.16kg of from 5 to 40g/10min, preferably from 15 to 30g/10 min.
According to the invention, the composition can also contain an antioxidant, preferably, the antioxidant is one or more of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], tris [2, 4-di-tert-butylphenyl ] phosphite and n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, preferably one or more of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, and calcium stearate. In the present invention, the antioxidant may be used in an amount of 0.1 to 0.6 parts by weight, preferably 0.2 to 0.5 parts by weight. In the invention, when the antioxidant is contained in the cold-resistant fastener composition for the ballastless track, the aging resistance of the prepared fastener can be increased.
According to the invention, the composition can also contain color master batches, and preferably, the color master batches can be one or more of reinforcing black master batches, highlight master batches and general master batches; in addition, in the present invention, the color masterbatch may be used in an amount of 1 to 5 parts by weight, preferably 1 to 3 parts by weight. According to the invention, when the cold-resistant fastener composition for the ballastless track contains the color master batch, the strength of the prepared fastener can be increased.
The invention provides a preparation method of a cold-resistant fastener material for a ballastless track, wherein the method comprises the following steps: mixing the composition and extruding for granulation; preferably, the extrusion granulation conditions include: the temperature is 150 ℃ to 210 ℃, preferably 160 ℃ to 200 ℃.
According to the invention, the components in the cold-resistant fastener composition for the ballastless track can be mixed and stored before use, and can also be stored independently. In a preferable case, each component in the cold-resistant fastener composition for the ballastless track is independently preserved before use.
According to the invention, firstly, the components in the cold-resistant fastener composition for the ballastless track are mixed, wherein the equipment for mixing can be a high-speed mixer, and the mixing time is not particularly limited as long as the components for preparing the composition are uniformly mixed; secondly, extruding and granulating the mixed mixture, wherein the equipment used for granulating can be a double-screw extruder, and in the invention, the conditions for extruding and granulating can comprise: the extrusion temperature is 150-210 ℃, preferably 160-200 ℃. The extrusion temperature in the present invention means that the temperature in the twin-screw extruder is controlled within the above-mentioned preferred range, i.e., the temperature of the composition gradually increases while passing through the twin-screw extruder, but the maximum temperature thereof is not higher than 210 ℃ and the minimum temperature thereof is not lower than 150 ℃.
The third aspect of the invention provides the cold-resistant fastener material for the ballastless track prepared by the preparation method, and preferably, the cold-resistant fastener material for the ballastless track has a low-temperature embrittlement temperature of less than or equal to-70 ℃ and a shore strengthHardness in durometer>90A, tensile strength of not less than 10Mpa, volume resistivity of not less than 10 8 And the ratio of dynamic stiffness to static stiffness is less than or equal to 1.5.
According to the invention, the cold-resistant fastener for the ballastless track is prepared by adopting the cold-resistant fastener material for the ballastless track: for example, a melt blending method can be adopted, specifically, the components in the elastic fastener composition for the ballastless track are mixed in a high-speed mixer for 2min, mixed uniformly, and then the mixed mixture is extruded and granulated, wherein the process temperature is as follows:
160 ℃, 175 ℃, 180 ℃, 185 ℃, 195 ℃, 190 ℃, 185 ℃ and 180 ℃ of a machine head.
The present invention will be described in detail below by way of examples. In the following examples, the performance index parameter test criteria are as follows:
1. tensile strength test standard: GB/T1040.2-2006;
2. stress at definite elongation test standard: GB/T1040.2-2006;
3. volume resistivity test standard: GB/T1410-2006;
4. embrittlement temperature test criteria: GB/T5470-;
5. shore hardness: GB/T3398.2-2008;
6. melt mass flow rate: GB/T3682.1-2018;
the raw materials are products of Yanshan petrochemical company with the brands of EVA1803, EVA24J6, PE5000S, PE1800, PE7600 and PP18010, and the antioxidant 1010/168/176, Jili black masterbatch and calcium stearate are all commercial products.
Example 1
The embodiment illustrates the cold-resistant fastener material for the ballastless track prepared by the method of the invention.
(1) The cold-resistant fastener composition for the ballastless track comprises the following components in percentage by weight:
80 parts by weight of ethylene-vinyl acetate copolymer, wherein the content of a vinyl acetate structural unit is 20 percent by weight, and the melt index of the ethylene-vinyl acetate copolymer at 190 ℃ under the load of 2.16kg is 3g/10 min;
15 parts by weight of high-density polyethylene HDPEWherein the HDPE has a density of 0.97g/cm 3 A melt index of 0.9g/10min at 190 ℃ under a load of 2.16 kg;
(2) extrusion granulation
Uniformly mixing all components in the cold-resistant fastener composition for the ballastless track in the step (1) by adopting a double-screw extruder, and then extruding and granulating the mixed mixture, wherein the process temperature is as follows:
160 ℃, 175 ℃, 180 ℃, 185 ℃, 195 ℃, 190 ℃, 185 ℃ and 180 ℃ of a machine head.
The performance of the prepared cold-resistant fastener material S1 for the ballastless track is tested, as shown in table 1.
Example 2
The embodiment illustrates the cold-resistant fastener material for the ballastless track prepared by the method of the invention.
(1) The cold-resistant fastener composition for the ballastless track comprises the following components in percentage by weight:
80 parts by weight of ethylene-vinyl acetate copolymer, wherein the content of a vinyl acetate structural unit is 18% by weight, and the melt index of the ethylene-vinyl acetate copolymer at 190 ℃ under the load of 2.16kg is 3g/10 min;
15 parts by weight of high-density polyethylene HDPE, wherein the density of the HDPE is 0.97g/cm 3 A melt index of 0.9g/10min at 190 ℃ under a load of 2.16 kg;
0.4 part by weight of antioxidant beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate;
0.5 part by weight of filler calcium stearate;
(2) extrusion granulation
Uniformly mixing all components in the cold-resistant fastener composition for the ballastless track in the step (1) by adopting a double-screw extruder, and then extruding and granulating the mixed mixture, wherein the process temperature is as follows:
160 ℃, 175 ℃, 180 ℃, 185 ℃, 195 ℃, 190 ℃, 185 ℃ and 180 ℃ of a machine head.
The performance of the prepared cold-resistant fastener material S2 for the ballastless track is tested, as shown in table 1.
Example 3
The embodiment illustrates the cold-resistant fastener material for the ballastless track prepared by the method of the invention.
(1) The cold-resistant fastener composition for the ballastless track comprises the following components in percentage by weight:
75 parts of ethylene-vinyl acetate copolymer, wherein the content of a vinyl acetate structural unit is 18% by weight, and the melt index of the ethylene-vinyl acetate copolymer is 3g/10 min;
15 parts by weight of high-density polyethylene HDPE, wherein the density of the HDPE is 0.95g/cm 3 A melt index of 0.9g/10min at 190 ℃ under a load of 2.16 kg;
10 parts by weight of low-density polyethylene LDPE, wherein the density of the LDPE is 0.91g/cm 3 A melt index of 6g/10min at 190 ℃ under a load of 2.16 kg;
2 parts of black color-enhancing master batch;
0.4 part by weight of antioxidant beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate;
0.2 part by weight of filler calcium stearate;
(2) extrusion granulation
Uniformly mixing all components in the cold-resistant fastener composition for the ballastless track in the step (1) by adopting a double-screw extruder, and then extruding and granulating the mixed mixture, wherein the process temperature is as follows:
170 ℃, 175 ℃, 180 ℃, 185 ℃, 195 ℃, 190 ℃, 185 ℃ and 180 ℃ of a machine head.
The performance of the prepared cold-resistant fastener material S3 for the ballastless track is tested, as shown in table 1.
Example 4
The embodiment illustrates the cold-resistant fastener material for the ballastless track prepared by the method of the invention.
(1) The cold-resistant fastener composition for the ballastless track comprises the following components in percentage by weight:
75 parts of ethylene-vinyl acetate copolymer, wherein the content of a vinyl acetate structural unit is 18% by weight, and the melt index of the ethylene-vinyl acetate copolymer is 3g/10 min;
15 parts by weight of high-density polyethylene HDPE, wherein the melt index of the HDPE at 190 ℃ under the load of 2.16kg is 0.9g/10 min;
10 parts by weight of low-density polyethylene (HDPE), wherein the melt index of the HDPE under the load of 2.16kg at 190 ℃ is 20g/10 min;
0.4 part by weight of antioxidant beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate;
2 parts of black color-enhancing master batch;
0.2 part by weight of filler calcium stearate; 0.1 part by weight of filler zinc oxide;
(2) extrusion granulation
Uniformly mixing all components in the cold-resistant fastener composition for the ballastless track in the step (1) by adopting a double-screw extruder, and then extruding and granulating the mixed mixture, wherein the process temperature is as follows:
160 ℃, 175 ℃, 180 ℃, 185 ℃, 195 ℃, 190 ℃, 185 ℃ and 180 ℃ of a machine head.
The performance of the prepared cold-resistant fastener material S4 for the ballastless track is tested, as shown in table 1.
Example 5
The embodiment illustrates the cold-resistant fastener material for the ballastless track prepared by the method of the invention.
The cold-resistant fastener material for the ballastless track is prepared by the same method as the example 2, except that: the content of the vinyl acetate structural unit in the ethylene-vinyl acetate copolymer is 20 weight percent, and the melt index of the ethylene-vinyl acetate copolymer under the load of 2.16kg at 190 ℃ is 10g/10 min;
40 parts by weight of high-density polyethylene HDPE, wherein the density of the HDPE is 0.96g/cm 3 A melt index of 0.9g/10min at 190 ℃ under a load of 2.16 kg;
40 parts by weight of low-density polyethylene LDPE, wherein the density of the LDPE is 0.93g/cm 3 A melt index of 6g/10min at 190 ℃ under a load of 2.16 kg;
0.2 part by weight of antioxidant beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate;
0.2 part by weight of antioxidant tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester;
2 parts of black color-enhancing master batch;
0.2 part by weight of filler chlorinated polyethylene;
the performance of the prepared cold-resistant fastener S5 for the ballastless track is tested and is shown in Table 1.
Comparative example 1
The cold-resistant fastener material for the ballastless track is prepared by the same method as the example 2, except that: 90 parts by weight of ethylene-vinyl acetate copolymer;
10 parts by weight of Polyethylene (PE), wherein the melt index of the PE under a load of 2.16kg at 190 ℃ is 8g/10 min;
0.4 part of antioxidant beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate.
The performance of the cold-resistant fastener DS1 for the ballastless track is tested and is shown in Table 1.
Comparative example 2
The cold-resistant fastener material for the ballastless track is prepared by the same method as the embodiment 3, except that: 85 parts of ethylene-vinyl acetate copolymer;
15 parts by weight of polypropylene (PP), wherein the melt index of the PP under the load of 2.16kg at 230 ℃ is 10g/10 min;
0.4 part of antioxidant beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate.
The performance of the cold-resistant fastener DS2 for the ballastless track is tested and is shown in Table 1.
Comparative example 3
The cold-resistant fastener material for the ballastless track is prepared by the same method as the embodiment 4, except that: 95 parts by weight of an ethylene-vinyl acetate copolymer,
5 parts by weight of high-density polyethylene HDPE.
The performance of the cold-resistant fastener DS3 for the ballastless track is tested and is shown in Table 1.
Comparative example 4
The cold-resistant fastener material for the ballastless track is prepared by the same method as the example 2, except that: 10 parts by weight of an ethylene-vinyl acetate copolymer,
90 parts by weight of high-density polyethylene HDPE;
0.2 part by weight of antioxidant beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate;
0.2 part by weight of antioxidant tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester;
0.2 part by weight of black reinforced master batch;
0.2 part by weight of filler calcium stearate.
The performance of the cold-resistant fastener DS4 for the ballastless track is tested and is shown in Table 1.
Comparative example 5
The cold-resistant fastener material for the ballastless track is prepared by the same method as the example 2, except that: the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 28 weight percent, and the melt index of the ethylene-vinyl acetate copolymer is 5g/10 min;
the density of the high density polyethylene HDPE is 0.949g/cm 3 The melt index was 0.04g/10 min.
The performance of the cold-resistant fastener DS5 for the ballastless track is tested and is shown in Table 1.
TABLE 1
As can be seen from the results of table 1:
(1) in the embodiment adopting the cold-resistant fastener composition for the ballastless track, the cold-resistant performance of S3 and S4 is low temperature resistant, the effect is obviously better, no filler is used in the embodiment 1, the content of each component in the embodiment 5 is not in the range limited by the invention, and the effect is slightly worse than the comprehensive performance of the embodiments 2-4;
(2) comparative examples 1 to 5 are not provided with the technical scheme of the invention, and the dynamic and static rigidity ratio is higher than that of examples 1 to 5, so that the dynamic and static rigidity ratio of comparative examples 1 to 5 is large, the derailment coefficient of a high-speed train in operation is increased, and the train operation safety is reduced; in addition, comparative examples 1 to 5 are poor in cold resistance.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (16)
1. The cold-resistant fastener composition for the ballastless track is characterized by comprising base resin, reinforced resin and filler, wherein the base resin is an ethylene-vinyl acetate copolymer, the reinforced resin is high-density polyethylene and/or low-density polyethylene, and the filler is one or more of calcium stearate, zinc oxide and chlorinated polyethylene;
wherein the dosage of the base resin is 40-80 parts by weight, the dosage of the reinforced resin is 15-55 parts by weight, and the dosage of the filler is 0.1-0.2 part by weight.
2. The composition of claim 1, wherein the vinyl acetate structural units are present in an amount of 5 to 22 wt% and the ethylene structural units are present in an amount of 75 to 95 wt%, based on the total weight of the ethylene-vinyl acetate copolymer.
3. The composition of claim 2, wherein the ethylene-vinyl acetate copolymer has a melt index of 1 to 20g/10min at 190 ℃ under a load of 2.16 kg.
4. The composition of claim 1, wherein the high density polyethylene has a density of 0.95 to 0.97g/cm 3 The melt index under the load of 2.16kg at 190 ℃ is 0.1-20g/10 min; the low density polyethylene has a density of 0.91-0.94 g/cm 3 And a melt index of 5 to 40g/10min under a load of 2.16kg at 190 ℃.
5. The composition of any one of claims 1-4, wherein the composition further comprises an antioxidant.
6. The composition of claim 5, wherein the antioxidant is one or more of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], tris [2, 4-di-tert-butylphenyl ] phosphite, and n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate.
7. The composition of claim 6, wherein the antioxidant is used in an amount of 0.1 to 0.6 parts by weight.
8. The composition of claim 7, wherein the antioxidant is used in an amount of 0.2 to 0.5 parts by weight.
9. The composition of any one of claims 1-4, wherein the composition further comprises a color masterbatch.
10. The composition of claim 9 wherein the color concentrate is present in an amount of 1 to 5 parts by weight.
11. The composition of claim 10 wherein the color concentrate is present in an amount of 1 to 3 parts by weight.
12. A preparation method of a cold-resistant fastener material for a ballastless track is characterized by comprising the following steps: mixing and extrusion granulating a composition according to any one of claims 1 to 11.
13. The method of claim 12, wherein the extrusion granulation conditions comprise: the temperature is 150 ℃ and 210 ℃.
14. The production method according to claim 13, wherein the conditions for extrusion granulation include: the temperature is 160-200 ℃.
15. The cold-resistant fastener material for the ballastless track prepared by the preparation method of any one of claims 12-14.
16. The cold-resistant fastener material for the ballastless track of claim 15, wherein the cold-resistant fastener material for the ballastless track has a low-temperature embrittlement temperature of-70 ℃ and a shore hardness of ≤ 70 ℃>91A, tensile strength is more than or equal to 11 MPa, stress at definite elongation is more than or equal to 8MPa, dynamic-static stiffness ratio is less than or equal to 1.5, volume resistivity is more than or equal to 10 9 。
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| CN201910498455.3A CN112063033B (en) | 2019-06-10 | 2019-06-10 | Cold-resistant fastener composition for ballastless track, cold-resistant fastener material for ballastless track and preparation method of cold-resistant fastener material |
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| WO2014142599A1 (en) * | 2013-03-14 | 2014-09-18 | 에스케이이노베이션 주식회사 | Hot-melt adhesive composition having enhanced cold-tolerance |
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| CN101608036B (en) * | 2009-06-26 | 2011-03-16 | 孝感学院 | Special material for reinforcing steel bar insulating clamp of ballastless track and preparation method thereof |
| CN102675710A (en) * | 2011-03-11 | 2012-09-19 | 北京化工大学 | Molding technique of high-density polyethylene sliding layer sheets for high-speed railway ballastless tracks |
| CN105602079B (en) * | 2016-02-17 | 2018-06-29 | 湖北工程学院 | A kind of ballastless track of high-speed railway reinforcing steel bar insulating heat-shrink tube and its production method |
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| WO2014142599A1 (en) * | 2013-03-14 | 2014-09-18 | 에스케이이노베이션 주식회사 | Hot-melt adhesive composition having enhanced cold-tolerance |
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