CN109575591B - Insulating composition for railway - Google Patents
Insulating composition for railway Download PDFInfo
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- CN109575591B CN109575591B CN201811536030.9A CN201811536030A CN109575591B CN 109575591 B CN109575591 B CN 109575591B CN 201811536030 A CN201811536030 A CN 201811536030A CN 109575591 B CN109575591 B CN 109575591B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
- C08L77/06—Polyamides derived from polyamines and polycarboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/004—Additives being defined by their length
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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Abstract
The invention relates to the technical field of railway application, in particular to an insulation composition for a railway and a preparation method thereof. The invention provides an insulating composition for railways, which is prepared from raw materials including nylon, glass fiber, maleic anhydride modified SEBS, modified polypropylene and talcum powder; wherein the raw materials for preparing the modified polypropylene comprise polypropylene and olefin containing a cyclic structure.
Description
Technical Field
The invention relates to the technical field of railway application, in particular to an insulation composition for a railway and a preparation method thereof.
Background
Rail insulation is one of the basic components of a track circuit, and the mechanical strength of a rail joint should not be reduced except for ensuring the normal operation of the track circuit. The rail insulation material is required to have good insulation performance and high compression strength, and the rail insulation is easy to damage due to the adverse effects of weather and environment and the continuous action of alternating load of train operation; the rail is the weakest link of a steel rail, the rail insulation material adopts PA6, PA66, PA1010, MC nylon and the like, main products comprise groove insulation, an insulating tube pad, an insulating washer, rail end insulation and the like, and the rail insulation technology and the insulating material become the key of the technical development of rail circuit equipment.
Nylon materials have been widely used as engineering plastics with excellent comprehensive properties in high-speed railway parts, but high-speed railway requires high strength and high toughness of the used materials, and nylon materials have some defects in the process of single application, such as brittle fracture easily at low temperature and softening easily at higher temperature; in addition, the nylon material is easy to change the mechanical property under the action of water, has poor weather resistance and cannot keep good insulating property for a long time; and the steel is easy to peel off from iron core materials such as rails and the like, is easy to fall off, and brings potential harm to railway running in the rails.
In view of the above problems, the present invention provides an insulation composition for railways based on nylon-based material, which has excellent insulation properties and maintains good properties at high and low temperatures, i.e. the insulation composition has good weather resistance, and in addition, the composition has good toughness, hardness and friction properties, thereby improving the service life of the insulation material; the insulating composition has the advantages of simple preparation method and low cost, and is suitable for industrial production.
Disclosure of Invention
The invention provides an insulating composition for railways, wherein the preparation raw materials comprise nylon, glass fiber, maleic anhydride modified SEBS, modified polypropylene and talcum powder; wherein the raw materials for preparing the modified polypropylene comprise polypropylene and olefin containing a cyclic structure.
According to a preferable technical scheme, the preparation raw materials comprise, by weight, 30-90 parts of nylon, 10-30 parts of glass fiber, 5-75 parts of maleic anhydride modified SEBS, 20-50 parts of modified polypropylene and 3-10 parts of talcum powder.
The invention relates to a preferable technical scheme, wherein the weight ratio of nylon to maleic anhydride modified SEBS is 1: (0.2-0.8).
In a preferred embodiment of the present invention, the molar ratio of maleic anhydride to SEBS in the maleic anhydride-modified SEBS is 1: (2-8).
As a preferable technical scheme of the invention, the SEBS has the structure
Wherein, n: m is1：m2Is 1: (3-10): (3-15).
In a preferred embodiment of the present invention, the olefin having a cyclic structure contains an amino group.
In a preferred embodiment of the present invention, the cyclic structure in the olefin having a cyclic structure is a heterocycle and contains at least one N.
As a preferred embodiment of the present invention, the olefin having a cyclic structure is 4- (3-buten-1-yl) -3-isopropyl-2-azetidinone and/or 2-hydroxy-5-iminoazepin-3-ene.
The second aspect of the invention provides a preparation method of the insulation composition, which comprises the steps of firstly melting and blending nylon and maleic anhydride modified SEBS, then adding glass fiber, modified polypropylene and talcum powder in sequence, melting and blending, extruding and cooling.
In a third aspect, the present invention provides an insulation material comprising the insulation composition.
Has the advantages that:
(1) the glass fiber contained in the insulating composition provided by the invention has a specific length, and is beneficial to improving the mechanical property, the wear resistance and the weather resistance of the insulating composition;
(2) the insulating composition provided by the invention has the maleic anhydride modified SEBS with a specific structure, and is beneficial to improving the toughness and hardness of the insulating composition, so that the wear resistance and weather resistance of a system are improved;
(3) the insulating composition containing the modified polypropylene can effectively realize the mechanical properties of low-temperature brittleness resistance and high-temperature softness resistance, and simultaneously can improve the water resistance of the insulating composition and prolong the service life of the material.
(4) The insulating composition provided by the invention is simple in preparation method, low in cost and suitable for industrial production.
Detailed Description
The invention provides an insulation composition for railways, which is prepared from raw materials including nylon, glass fiber, maleic anhydride modified SEBS, modified polypropylene and talcum powder.
Preferably, the insulation composition is prepared from, by weight, 30-90 parts of nylon, 10-30 parts of glass fiber, 5-75 parts of maleic anhydride modified SEBS, 20-50 parts of modified polypropylene and 3-10 parts of talcum powder.
More preferably, the raw materials for preparing the insulation composition comprise, by weight, 60 parts of nylon, 15 parts of glass fiber, 33 parts of maleic anhydride modified SEBS, 40 parts of modified polypropylene and 6 parts of talcum powder.
Nylon:
nylon is a term for polyamide fiber (nylon) and can be made into long fibers or short fibers. Nylon is a trade name for polyamide fiber, also known as Nylon (Nylon). The basic component of Polyamide (abbreviated as PA) is aliphatic Polyamide linked by amide bonds [ NHCO ] -.
The product has wide application, uses plastics to replace good materials of steel, iron, copper and other metals, and is important engineering plastics; the cast nylon can be used to replace antiwear parts of mechanical equipment and copper and alloy. The method is suitable for manufacturing wear-resistant parts, transmission structural parts, household appliance parts, automobile manufacturing parts and the like.
The impact resistance of nylon is good, but the impact strength of nylon is greatly influenced by temperature and water absorption; the amide groups in the molecular chain affect the insulation of the material due to the polarity, and the electrical insulation of nylon is good under low temperature and dry conditions, but the electrical property of the material is reduced under humid conditions, and the electrical property of the material is also reduced along with the increase of the temperature.
In one embodiment, the nylon is selected from the group consisting of nylon 6, nylon 66, nylon 11, nylon 12, nylon 610, nylon 612, nylon 46, nylon 1010, any one or more combinations thereof; preferably, the nylon is nylon 6, nylon 6 and nylon 46; further preferably, the weight ratio of nylon 6, nylon 6 and nylon 46 is 1: (0.5-2.5): (0.3 to 3); more preferably, the weight ratio of nylon 6, nylon 66 and nylon 46 is 1: 0.85: 1.05; the manufacturers of said nylon 6, nylon 66 and nylon 46 are not particularly restricted, said nylon 6, nylon 66 and nylon 46 being obtained from dellon nylon.
Glass fiber:
the glass fiber is an inorganic non-metallic material with excellent performance, has various varieties, has the advantages of good insulativity, strong heat resistance, good corrosion resistance and high mechanical strength, but has the defects of brittleness and poor wear resistance. The hair-care fiber is made of seven kinds of ores of pyrophyllite, quartz sand, limestone, dolomite, borocalcite and boromagnesite through the processes of high-temperature melting, wire drawing, winding, weaving and the like, wherein the diameter of each monofilament ranges from several micrometers to twenty micrometers, the monofilament is equivalent to 1/20-1/5 of one hair, and each bundle of fiber precursor consists of hundreds of even thousands of monofilaments. Glass fibers are commonly used as reinforcing materials in composite materials, electrical and thermal insulation materials, circuit substrates, and other various fields of the national economy.
In the actual use process, the length of the glass fiber directly influences the performance of the material; if the glass fiber is not well treated, the impact strength can be reduced by the short fiber, and the brittleness of the material can be improved by the long fiber, so that the glass fiber with a certain length is selected to ensure that the brittleness of the material is not greatly reduced.
In one embodiment, the glass fiber has a length of 0.5 to 30 mm; preferably, the length of the glass fiber is 5-20 mm; more preferably, the length of the glass fiber is 8-12 mm.
In one embodiment, the glass fiber has a diameter of 5 to 30 μm; preferably, the diameter of the glass fiber is 10-25 μm; more preferably, the diameter of the glass fiber is 15 to 20 μm.
Experiments show that the content of the glass fiber has great influence on the service performance of the material, the content of the glass fiber is too large, the dispersibility is not good, the aggregation is easy, and the mechanical property, the wear resistance, the weather resistance and the like of the material are influenced; when the content is small or no glass fiber is available, the impact strength, the weather resistance, the friction resistance and the water resistance of the material are reduced, and probably because the hydrogen bond acting force among molecules is relatively strong under the condition of lacking the glass fiber, the acting force among the molecules is damaged under the conditions of water and heat, the material performance is changed, and under the condition of being cold, the molecular chain has no small steric hindrance, the material is easy to act, the molecular motion freedom degree is reduced, and the impact resistance is also reduced.
Maleic anhydride-modified SEBS:
the SEBS is a styrene-ethylene-butylene-styrene block copolymer, takes polystyrene as a terminal segment, takes an ethylene-butylene copolymer obtained by hydrogenating polybutadiene as a linear triblock copolymer of a middle elastic block, is between plastic and rubber, has the dual and wide characteristics of rubber and plastic, and has the triblock copolymerization with the molecular configuration of A-B-A type.
In one embodiment, the weight ratio of nylon to maleic anhydride modified SEBS is 1: (0.2-0.8); preferably, the weight ratio of the nylon to the maleic anhydride modified SEBS is 1: (0.4-0.6); more preferably, the weight ratio of the nylon to the maleic anhydride modified SEBS is 1: 0.55.
in one embodiment, the mole ratio of maleic anhydride to SEBS in the maleic anhydride-modified SEBS is 1: (2-8); preferably, the molar ratio of maleic anhydride to SEBS is 1: (3-6); more preferably, the molar ratio of maleic anhydride to SEBS is 1: 5.
in one embodiment, the structure of the SEBS in the maleic anhydride modified SEBS is
Wherein, n: m is1：m2Is 1: (3-10): (3-15); preferably, the ratio of n: m is1：m2Is 1: (5-8): (5-12); more preferably, the ratio of n: m is1：m2Is 1: 6: 10, the manufacturer of the SEBS is not particularly limited, and in the experiment, the SEBS is purchased from the ba ling petrochemical industry.
In one embodiment, the preparation method of the maleic anhydride modified SEBS comprises the following steps: placing the SEBS and maleic anhydride in a closed reaction container under the nitrogen atmosphere, heating at 145-175 ℃, stirring for 0.5-2 h, adding dibenzoyl peroxide, and reacting for 8-12 h to obtain maleic anhydride modified SEBS;
the molar ratio of dibenzoyl peroxide to maleic anhydride is (0.003-0.007): 1; preferably, the molar ratio of dibenzoyl peroxide to maleic anhydride is 0.005: 1.
preferably, in an embodiment, the preparation method of the maleic anhydride modified SEBS is as follows: and (2) under the nitrogen atmosphere, putting the SEBS and maleic anhydride into a closed reaction container, heating at 150 ℃, stirring for 1h, adding dibenzoyl peroxide, and reacting for 10h to obtain the maleic anhydride modified SEBS.
Experiments show that the service performance of the insulating composition can be adjusted by maleic anhydride modified SEBS, and a proper molecular structure has great influence on the service performance of the insulating composition, so that the compatibility of an organic phase and an inorganic phase can be well adjusted in a melting process of maleic anhydride in a system, intermolecular acting force is favorably formed, the hardness of the system is improved, and the system can be used as a crosslinking point to improve the softening temperature of the system; in addition, the applicant also finds out through experiments that when styrene, ethylene and butylene are in proper proportion in the SEBS, the performance of the prepared insulation composition is optimal, probably because butylene and ethylene molecular chain segments can adjust the flexibility of the system and promote the dispersion and compatibility of an organic phase and an inorganic phase, and the styrene unit can be used as molecular steric hindrance or entanglement point to improve the hardness of the material while improving the strength, and can also prevent the slippage between molecular chains to improve the weather resistance and the wear resistance of the material under the synergistic action.
Modified polypropylene:
the modified polypropylene is a polypropylene derivative formed by taking polypropylene as a matrix and grafting or blocking different groups, elastomers or inorganic materials in the polypropylene matrix through chemical reaction.
The polypropylene is non-toxic, tasteless, low in density, superior in strength, rigidity, hardness and heat resistance to low-pressure polyethylene, and can be used at about 100 ℃. Has good dielectric property and high-frequency insulation property, is not influenced by humidity, but becomes brittle at low temperature, is not wear-resistant and is easy to age. It is suitable for making general mechanical parts, corrosion-resistant parts and insulating parts.
In one embodiment, the raw materials for preparing the modified polypropylene comprise polypropylene and olefin containing a cyclic structure.
In one embodiment, the degree of polymerization of the polypropylene is 100 to 1000; preferably, the polymerization degree of the polypropylene is 200-800; more preferably, the polymerization degree of the polypropylene is 450 to 500.
In one embodiment, the molar ratio of the polypropylene to the olefin containing a cyclic structure is 1 (0.5-0.01); preferably, the molar ratio of the polypropylene to the olefin containing a cyclic structure is 1 (0.3-0.08); more preferably, the molar ratio of polypropylene to olefin containing a cyclic structure is 1: 0.15.
in one embodiment, the olefin containing a cyclic structure contains an amino group; preferably, the ring-containing structure is a heterocycle and contains at least one N.
In one embodiment, the olefin containing a cyclic structure is 4- (3-buten-1-yl) -3-isopropyl-2-azetidinone and/or 2-hydroxy-5-iminoazepin-3-ene; preferably, the olefins containing cyclic structures are 4- (3-buten-1-yl) -3-isopropyl-2-azetidinone and 2-hydroxy-5-iminoazepin-3-ene; further preferably, the molar ratio of 4- (3-buten-1-yl) -3-isopropyl-2-azetidinone to 2-hydroxy-5-iminoazepin-3-ene is 1: (0.5 to 1.5); more preferably, the molar ratio of 4- (3-buten-1-yl) -3-isopropyl-2-azetidinone to 2-hydroxy-5-iminoazepin-3-ene is 1: 0.8; the CAS for the 4- (3-buten-1-yl) -3-isopropyl-2-azetidinone is 101347-89-1, 2-hydroxy-5-iminoazepin-3-ene is 71765-74-7.
In one embodiment, the modified polypropylene is prepared by the following steps: placing polypropylene and olefin containing a cyclic structure in a closed reaction container in a nitrogen atmosphere, heating at 125-155 ℃, stirring for 0.5-1.5 h, adding dibenzoyl peroxide, and reacting for 6-10 h to obtain modified polypropylene;
the molar ratio of the dibenzoyl peroxide to the olefin containing a cyclic structure is (0.002-0.008): 1; preferably, the molar ratio of dibenzoyl peroxide to olefin containing a cyclic structure is 0.006: 1.
preferably, in one embodiment, the modified polypropylene is prepared by the following steps: in the nitrogen atmosphere, polypropylene and olefin containing a cyclic structure are placed in a closed reaction container, heated at 130 ℃, stirred for 1h, added with dibenzoyl peroxide and reacted for 8h to obtain the modified polypropylene.
In the experimental process, the modified polypropylene is added into the insulation combination system to greatly improve the mechanical property and the friction resistance of the insulation composition, which probably can improve the uniformity of the insulation composition due to the modified polypropylene, avoid the stress defect and the stress concentration of the composition, and improve the local motion freedom of a molecular chain, thereby improving the impact resistance and the abrasion resistance of the material.
In addition, experiments also show that the insulating composition containing the modified polypropylene also has better water resistance and weather resistance, the modified polypropylene improves the local motion freedom of a molecular chain, and simultaneously is well compatible with nylon and SEBS in the melting process, so that the regularity of molecular arrangement in a system is reduced; on the other hand, the N-containing cyclic structure in the modified polypropylene can prevent slippage and large-degree relative movement between molecular chains, so that the weather resistance of the material is improved; in addition, the N-containing cyclic structure in the modified polypropylene can enhance the dispersion and compatibility degree between inorganic phase and organic phase, improve the uniformity of the material, improve the water resistance of the insulation system and prolong the service cycle of the material.
Talc powder:
the talc contains hydrous magnesium silicate of talc as main ingredient and has a molecular formula of Mg3[Si4O10](OH)2Talc belongs to monoclinic system, and the crystal is in a pseudo-hexagonal or rhombohedral shape and is occasionally seen; the product is usually in a dense massive, leaf-shaped, radial and fibrous aggregate, is colorless and transparent or white, but has light green, light yellow, light brown and even light red due to containing a small amount of impurities; the cleavage surface is pearl-like; the specific gravity is 2.7-2.8.
In one embodiment, the particle size of the talcum powder is 30-80 μm; preferably, the particle size of the talcum powder is 45-65 μm; more preferably, the particle size of the talcum powder is 50-60 μm.
The invention is not particularly restricted to the manufacturer of talc, which in this experiment is purchased from Shenba chemical.
The second aspect of the invention provides a preparation method of the insulating composition, wherein nylon and maleic anhydride modified SEBS are firstly melted and blended, then glass fiber, modified polypropylene and talcum powder are sequentially added, melted and blended, and then extrusion cooling is carried out.
Preferably, the preparation method of the insulation composition is as follows: firstly, melting and blending nylon and maleic anhydride modified SEBS for 3-6 hours at 165-175 ℃; and sequentially adding glass fiber, modified polypropylene and talcum powder, melting and blending for 3-8 h at 175-185 ℃, extruding and cooling to obtain the insulating composition.
More preferably, the preparation method of the insulation composition is: firstly, melting and blending nylon and maleic anhydride modified SEBS for 4.5 hours at 170 ℃; and sequentially adding the glass fiber, the modified polypropylene and the talcum powder, melting and blending for 6 hours at 185 ℃, extruding and cooling to obtain the insulating composition.
The preparation method of melting and blending the nylon and the maleic anhydride modified SEBS firstly, and then adding the glass fiber, the modified polypropylene and the talcum powder into the melting and blending sequentially can also improve the service performance of the insulating material, which can ensure that the glass fiber and the talcum powder can be well dispersed in a system in the melting process according to the adding sequence, avoid the phenomena of concentration and sedimentation, simultaneously avoid the structural damage of inorganic particles as much as possible, keep the integrity of the inorganic particles, ensure that all substances in the insulating material obtained by cooling are uniformly dispersed, cannot generate obvious shrinkage under the action of mutual dragging of molecules, and keep the stability of macroscopic size and performance.
In a third aspect, the present invention provides an insulation material comprising the insulation composition.
Example 1
Embodiment 1 of the invention provides an insulation composition for a railway, which is prepared from 60 parts by weight of nylon, 15 parts by weight of glass fiber, 33 parts by weight of maleic anhydride modified SEBS, 40 parts by weight of modified polypropylene and 6 parts by weight of talcum powder;
the nylon is nylon 6, nylon 6 and nylon 46, and the weight ratio of the nylon 6 to the nylon 66 to the nylon 46 is 1: 0.85: 1.05;
the length of the glass fiber is 8-12 mm, and the diameter of the glass fiber is 15-20 mu m;
the molar ratio of maleic anhydride to SEBS in the maleic anhydride modified SEBS is 1: 5;
the SEBS structure in the maleic anhydride modified SEBS is
Wherein, n: m is1：m2Is 1: 6: 10;
the preparation method of the maleic anhydride modified SEBS comprises the following steps: placing SEBS and maleic anhydride in a closed reaction container under the nitrogen atmosphere, heating at 150 ℃, stirring for 1h, adding dibenzoyl peroxide, and reacting for 10h to obtain maleic anhydride modified SEBS;
the molar ratio of dibenzoyl peroxide to maleic anhydride is 0.005: 1;
the raw materials for preparing the modified polypropylene comprise polypropylene and olefin containing a cyclic structure;
the polymerization degree of the polypropylene is 450-500;
the molar ratio of the polypropylene to the olefin containing a cyclic structure is 1: 0.15;
the alkene containing the cyclic structure is 4- (3-butene-1-yl) -3-isopropyl-2-azetidinone and 2-hydroxy-5-imino-N-aza-pent-3-ene, the molar ratio of the 4- (3-butene-1-yl) -3-isopropyl-2-azetidinone to the 2-hydroxy-5-imino-N-aza-pent-3-ene is 1: 0.8;
the preparation method of the modified polypropylene comprises the following steps: placing polypropylene and olefin containing a cyclic structure in a closed reaction container under the atmosphere of nitrogen, heating at 130 ℃, stirring for 1h, adding dibenzoyl peroxide, and reacting for 8h to obtain modified polypropylene;
the molar ratio of the dibenzoyl peroxide to the olefin containing a cyclic structure is 0.006: 1;
the particle size of the talcum powder is 50-60 mu m;
the preparation method of the insulation composition comprises the following steps: firstly, melting and blending nylon and maleic anhydride modified SEBS for 4.5 hours at 170 ℃; and sequentially adding the glass fiber, the modified polypropylene and the talcum powder, melting and blending for 6 hours at 185 ℃, extruding and cooling to obtain the insulating composition.
Example 2
Embodiment 2 of the invention provides an insulation composition for a railway, which is prepared from the following raw materials, by weight, 90 parts of nylon, 30 parts of glass fiber, 45 parts of maleic anhydride modified SEBS, 50 parts of modified polypropylene and 10 parts of talcum powder;
the nylon is nylon 6, nylon 6 and nylon 46, and the weight ratio of the nylon 6 to the nylon 66 to the nylon 46 is 1: 0.85: 1.05;
the length of the glass fiber is 18-20 mm, and the diameter of the glass fiber is 15-20 mu m;
the molar ratio of maleic anhydride to SEBS in the maleic anhydride modified SEBS is 1: 8;
the SEBS structure in the maleic anhydride modified SEBS is
Wherein, n: m is1：m2Is 1: 10: 15;
the preparation method of the maleic anhydride modified SEBS comprises the following steps: placing SEBS and maleic anhydride in a closed reaction container under the nitrogen atmosphere, heating at 150 ℃, stirring for 1h, adding dibenzoyl peroxide, and reacting for 10h to obtain maleic anhydride modified SEBS;
the molar ratio of dibenzoyl peroxide to maleic anhydride is 0.005: 1;
the raw materials for preparing the modified polypropylene comprise polypropylene and olefin containing a cyclic structure;
the polymerization degree of the polypropylene is 450-500;
the molar ratio of the polypropylene to the olefin containing a cyclic structure is 1: 0.15;
the alkene containing the cyclic structure is 4- (3-butene-1-yl) -3-isopropyl-2-azetidinone and 2-hydroxy-5-imino-N-aza-pent-3-ene, the molar ratio of the 4- (3-butene-1-yl) -3-isopropyl-2-azetidinone to the 2-hydroxy-5-imino-N-aza-pent-3-ene is 1: 0.8;
the preparation method of the modified polypropylene comprises the following steps: placing polypropylene and olefin containing a cyclic structure in a closed reaction container under the atmosphere of nitrogen, heating at 130 ℃, stirring for 1h, adding dibenzoyl peroxide, and reacting for 8h to obtain modified polypropylene;
the molar ratio of the dibenzoyl peroxide to the olefin containing a cyclic structure is 0.006: 1;
the particle size of the talcum powder is 50-60 mu m;
the preparation method of the insulation composition comprises the following steps: firstly, melting and blending nylon and maleic anhydride modified SEBS for 4.5 hours at 170 ℃; and sequentially adding the glass fiber, the modified polypropylene and the talcum powder, melting and blending for 6 hours at 185 ℃, extruding and cooling to obtain the insulating composition.
Example 3
Embodiment 3 of the present invention provides an insulation composition for a railway, wherein raw materials for preparing the insulation composition comprise, by weight, 30 parts of nylon, 10 parts of glass fiber, 15 parts of maleic anhydride modified SEBS, 20 parts of modified polypropylene, and 3 parts of talc powder;
the nylon is nylon 6, nylon 6 and nylon 46, and the weight ratio of the nylon 6 to the nylon 66 to the nylon 46 is 1: 0.85: 1.05;
the length of the glass fiber is 5-8 mm, and the diameter of the glass fiber is 15-20 mu m;
the molar ratio of maleic anhydride to SEBS in the maleic anhydride modified SEBS is 1: 2;
the SEBS structure in the maleic anhydride modified SEBS is
Wherein, n: m is1：m2Is 1: 3: 3;
the preparation method of the maleic anhydride modified SEBS comprises the following steps: placing SEBS and maleic anhydride in a closed reaction container under the nitrogen atmosphere, heating at 150 ℃, stirring for 1h, adding dibenzoyl peroxide, and reacting for 10h to obtain maleic anhydride modified SEBS;
the molar ratio of dibenzoyl peroxide to maleic anhydride is 0.005: 1;
the raw materials for preparing the modified polypropylene comprise polypropylene and olefin containing a cyclic structure;
the polymerization degree of the polypropylene is 450-500;
the molar ratio of the polypropylene to the olefin containing a cyclic structure is 1: 0.15;
the alkene containing the cyclic structure is 4- (3-butene-1-yl) -3-isopropyl-2-azetidinone and 2-hydroxy-5-imino-N-aza-pent-3-ene, the molar ratio of the 4- (3-butene-1-yl) -3-isopropyl-2-azetidinone to the 2-hydroxy-5-imino-N-aza-pent-3-ene is 1: 0.8;
the preparation method of the modified polypropylene comprises the following steps: placing polypropylene and olefin containing a cyclic structure in a closed reaction container under the atmosphere of nitrogen, heating at 130 ℃, stirring for 1h, adding dibenzoyl peroxide, and reacting for 8h to obtain modified polypropylene;
the molar ratio of the dibenzoyl peroxide to the olefin containing a cyclic structure is 0.006: 1;
the particle size of the talcum powder is 50-60 mu m;
the preparation method of the insulation composition comprises the following steps: firstly, melting and blending nylon and maleic anhydride modified SEBS for 4.5 hours at 170 ℃; and sequentially adding the glass fiber, the modified polypropylene and the talcum powder, melting and blending for 6 hours at 185 ℃, extruding and cooling to obtain the insulating composition.
Example 4
Example 4 of the present invention provides an insulation composition for railways, which is embodied in the same manner as in example 1 except that the content of the glass fiber is replaced with 0.
Example 5
Example 5 of the present invention provides an insulation composition for railways, which is the same as example 1 except that the length of the glass fiber is replaced with 23 to 25 mm.
Example 6
Example 6 of the present invention provides an insulation composition for railways, which is the same as example 1 except that the length of the glass fiber is changed to 2 to 3 mm.
Example 7
Example 7 of the present invention provides an insulation composition for railways, which is similar to example 1 except that the content of the maleic anhydride-modified SEBS is replaced with 0.
Example 8
Example 8 of the present invention provides an insulation composition for railways, which is the same as example 1 except that the maleic anhydride-modified SEBS is replaced with SEBS.
Example 9
Example 9 of the present invention provides an insulating composition for railways, which is similar to example 1 except that the molar ratio of maleic anhydride to SEBS in the maleic anhydride-modified SEBS is replaced with 1: 1.
Example 10
Example 10 of the present invention provides an insulation composition for railways, which is the same as in example 1 except that n: m is1：m2The ratio of (a) to (b) is replaced by 1: 10: 15.
example 11
Example 11 of the present invention provides an insulation composition for railways, which is embodied in the same manner as in example 1 except that the modified polypropylene is replaced with polypropylene.
Example 12
Example 12 of the present invention provides an insulation composition for railways, which is embodied in the same manner as in example 1 except that the content of the modified polypropylene is replaced with 0.
Example 13
Example 13 of the present invention provides an insulation composition for use in railroads, which is embodied in the same manner as example 1 except that the olefin having a cyclic structure is replaced with 2-propen-1-yl N- ((4- (hydroxymethyl) phenyl) methyl) carbamate.
Example 14
Example 14 of the present invention provides an insulation composition for a railway, which is embodied in the same manner as in example 1 except that the talc content is replaced with 0.
Example 15
Example 15 of the present invention provides an insulation composition for railways, which is the same as example 1 in specific embodiment except that the preparation method of the insulation composition comprises: melting and blending nylon and glass fiber at 170 ℃ for 4.5 h; and sequentially adding maleic anhydride modified SEBS, modified polypropylene and talcum powder, melting and blending for 6 hours at 185 ℃, extruding and cooling to obtain the insulating composition.
Performance evaluation:
1. impact strength: the impact strength of the insulation compositions obtained in examples 1 to 15 was measured at room temperature and-20 ℃ respectively, and the test results are shown in Table 1, according to GB/T1043-93, with the sample size of 80mm × 10mm × 4mm and the supporting line spacing of 60 mm;
2. tensile strength: the tensile strength of the insulation compositions obtained in examples 1-15 was measured at room temperature and at 55 ℃ and 85% humidity, respectively, according to GB/T1447-2005, at a tensile rate of 10mm/min, the test results are shown in Table 1;
3. wear resistance: in this study, tribological properties were characterized using a friction and wear tester (UMT-3, CETR, usa) in a reciprocating mode, with the test conditions at ambient temperature as follows: the load is 2.5N, the frequency is 1Hz, the time is 20min, the length of a grinding crack is 5mm, the opposite friction material is a GCr15 steel ball, the diameter is 3mm, the friction medium is air, the wear coefficient of the material is measured, and the test result is shown in Table 1.
Table 1 results of performance testing
As can be seen from table 1, the insulation composition provided by the invention contains the glass fiber with a specific length, the maleic anhydride modified SEBS with a specific structure and the modified polypropylene, so that the insulation material has certain hardness and toughness, and the wear resistance of the system is improved; meanwhile, the mechanical properties of low temperature non-brittleness and high temperature non-softness, namely weather resistance, can be effectively realized; in addition, the high-insulation composition has water resistance and prolongs the service life of the material.
The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim as broad a scope as is contemplated, and the examples presented herein are merely illustrative of selected implementations in accordance with all possible combinations of examples. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Also, where numerical ranges are used in the claims, subranges therein are included, and variations in these ranges are also to be construed as possible being covered by the appended claims.
Claims (3)
1. An insulation composition for railways is characterized in that raw materials for preparation comprise nylon, glass fiber, maleic anhydride modified SEBS, modified polypropylene and talcum powder; wherein the raw materials for preparing the modified polypropylene comprise polypropylene and olefin containing a cyclic structure;
the SEBS has the structure of
And n: m is1：m2Is 1: (5-8): (5-12);
the length of the glass fiber is 5-20 mm;
the preparation raw materials comprise, by weight, 30-90 parts of nylon, 10-30 parts of glass fiber, 5-75 parts of maleic anhydride modified SEBS, 20-50 parts of modified polypropylene and 3-10 parts of talcum powder;
the molar ratio of maleic anhydride to SEBS in the maleic anhydride modified SEBS is 1: (2-8);
the alkene containing a cyclic structure is 4- (3-butene-1-yl) -3-isopropyl-2-azetidinone and/or 2-hydroxy-5-imino-azetidin-3-ene;
the preparation method of the insulation composition comprises the following steps: firstly, melting and blending nylon and maleic anhydride modified SEBS, then adding glass fiber, modified polypropylene and talcum powder in sequence, melting and blending, extruding and cooling.
2. The insulation composition according to claim 1, wherein the weight ratio of nylon to maleic anhydride modified SEBS is 1: (0.2-0.8).
3. An insulation material comprising an insulation composition as claimed in any of claims 1 to 2.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4795782A (en) * | 1986-09-25 | 1989-01-03 | Shell Oil Company | Impact resistant blends of thermoplastic polyamides, functionalized polyolefins and functionalized elastomers |
| US4871799A (en) * | 1985-10-28 | 1989-10-03 | Toyo Boseki Kabushiki Kaisha | Thermoplastic polymer composition |
| CN1756802A (en) * | 2003-03-03 | 2006-04-05 | 费罗公司 | Glass reinforced nylon blend with improved knitline strength |
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2018
- 2018-12-14 CN CN201811536030.9A patent/CN109575591B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4871799A (en) * | 1985-10-28 | 1989-10-03 | Toyo Boseki Kabushiki Kaisha | Thermoplastic polymer composition |
| US4795782A (en) * | 1986-09-25 | 1989-01-03 | Shell Oil Company | Impact resistant blends of thermoplastic polyamides, functionalized polyolefins and functionalized elastomers |
| CN1756802A (en) * | 2003-03-03 | 2006-04-05 | 费罗公司 | Glass reinforced nylon blend with improved knitline strength |
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