Novel polyester fiber protective net for underground coal mine

Abstract

The invention relates to the technical field of roadway support, in particular to a novel polyester fiber protective net for an underground coal mine, which comprises the following components in parts by weight: 60-100 parts of modified polyester fiber; 1 to 5 parts of a phosphate-carbonate copolymer; 0.05 to 0.1 part of an antioxidant; 5 to 10 parts of modified master batch; and 1 to 5 parts of titanate. By preparing the high-performance modified polyester fiber, the environment-friendly advantage of the straw and the polylactic acid, the heat reducing and enhancing effect of the ethylene bis stearamide and the antioxidant and heat stability improving characteristics of hafnium oxide are fused. Meanwhile, the composite PET modified master batch is adopted, and the carbon black, the flexibilizer and the compatilizer are combined, so that the color, the toughness and the antistatic performance are further enhanced. Through graphene enhancement, polyborosiloxane crosslinking and polytetrafluoroethylene grafting, the strength, heat resistance, creep resistance and corrosion resistance are remarkably improved. And the protective net suitable for the complex environment of the underground coal mine is prepared through a heating and wire extruding forming process.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel support, and specifically refers to a new polyester fiber protective net used in underground coal mines. Background Art

[0002] The tunnel environment of coal mines in my country is complex and diverse, especially in areas with soft surrounding rocks and coal seams significantly affected by mining. Anchor net support technology has become a key means to ensure the stability of tunnels. In traditional technologies, metal protective nets are widely used as the main support material due to their excellent bearing capacity and protective effect. Under most mine conditions, they effectively prevent the collapse of coal and rock fragments and share the surrounding rock pressure.

[0003] However, metal protective nets are susceptible to corrosion in extreme environments such as high temperature and high humidity, which leads to weakening of the mesh structure and a significant decrease in strength, thereby reducing the overall support efficiency, which not only affects the long-term stability of the tunnel, but also increases maintenance costs and safety hazards; secondly, although non-metallic nets can show advantages due to their corrosion resistance and other properties, their widespread lack of tensile strength limits their application potential in high-stress mining environments, making it difficult to meet the support needs of all mines. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a new polyester fiber protective net for underground coal mines, in order to solve the problems in the prior art that the metal protective net is easily corroded in high temperature and high humidity environment, the tensile strength of the non-metallic net is insufficient, and the support equipment and technology are difficult to fully adapt to the complex and changeable mine conditions.

[0005] The first aspect of the present application provides a novel polyester fiber protective net for underground coal mines. The novel polyester fiber protective net comprises the following components by weight:

[0006] Modified polyester fiber: 60-100 parts;

[0007] Phosphate-carbonate copolymer: 1-5 parts;

[0008] Antioxidant: 0.05-0.1 parts;

[0009] Modified masterbatch: 5-10 parts;

[0010] Titanate: 1-5 parts.

[0011] Optionally, the novel polyester fiber protective net comprises the following components by weight:

[0012] Modified polyester fiber: 70-90 parts;

[0013] Phosphate-carbonate copolymer: 2-4 parts;

[0014] Antioxidant: 0.06-0.08 parts;

[0015] Modified masterbatch: 6-8 parts;

[0016] Titanate: 3-4 parts.

[0017] Optionally, the modified polyester fiber comprises the following components by weight:

[0018] Straw: 10-15 portions;

[0019] Polylactic acid: 50-70 parts;

[0020] Ethylene bisstearamide: 0.5-1 part;

[0021] Plasticizer: 1-5 parts;

[0022] Hafnium oxide: 1-5 parts;

[0023] Stabilizer: 15-20 parts;

[0024] Coupling agent: 5-8 parts.

[0025] Optionally, the model of ethylene bisstearamide is KF-1, the plasticizer is one of phthalate and fatty acid ester, the stabilizer is one or more of calcium stearate, zinc stearate and non-toxic phosphite, and the coupling agent is one or more of silane coupling agent, titanate coupling agent and aluminate coupling agent.

[0026] Optionally, the phosphate-carbonate copolymer is prepared by mixing 25 parts by weight of polyaryl phosphate, 6 parts by weight of graphene, 2 parts by weight of polyborosiloxane and 0.5 parts by weight of polytetrafluoroethylene.

[0027] Optionally, the antioxidant is one of Irgano1010, Irgano168, and Irgano245.

[0028] Optionally, the modified masterbatch comprises the following components by weight:

[0029] Carbon black: 3-5 parts;

[0030] PET: 70-90 parts

[0031] Toughening agent: 10-30 parts;

[0032] Zirconia: 1-3 parts;

[0033] Compatibilizer: 2-8 parts.

[0034] Optionally, the toughening agent is one of ACR, MBS, POE-g-MAH, and E-MA-GMA, and the compatibilizer is polymethyl methacrylate grafted with maleic anhydride.

[0035] The second embodiment of the present application provides a method for preparing a novel polyester fiber protective net for underground coal mines, comprising the following steps:

[0036] Step 1: preparing modified polyester fiber, modified masterbatch and phosphate-carbonate copolymer respectively;

[0037] Step 2: Mix the prepared modified polyester fiber, modified masterbatch and phosphate-carbonate copolymer with other raw materials and dry them at a drying temperature of 120° for 5 hours;

[0038] Step 3: heating the dried product to extrude into wire;

[0039] Step 4: stretching the formed product, wherein the heating temperature is 280° C. and the stretching ratio is 4.5 times;

[0040] Step 5: shaping the stretched product, wherein the shaping temperature is 90°C;

[0041] Step 6: subjecting the shaped product to a fourth pulling, wherein the pressure is 0.6 MPa;

[0042] Step 7: Roll up the pulled product and inspect the product result. If the result is qualified, proceed to step 8. Otherwise, directly carry out secondary processing.

[0043] Step 8: Weave the qualified products into a net, thread the wires and reel them up, wherein the threading amount is 39 wires per meter, the netting setting temperature is 110°C, and the reeling length is 30.3 meters.

[0044] Optionally, the secondary processing is to cut the unqualified products and crush them, and the processed powder is used to prepare products again.

[0045] Therefore, this application has at least the following beneficial effects:

[0046] (1) By preparing modified polyester fibers, functional groups such as hydroxyl groups on the surface of straw fibers react with carboxyl groups or ester groups of polylactic acid to form covalent bonds, and adding ethylene bisstearamide can reduce heat accumulation, which can not only achieve biodegradability, but also improve the strength of the modified polyester fibers;

[0047] (2) After the grafting reaction, hafnium oxide is added to the polylactic acid to form a coating layer on the surface, which is not only anti-oxidative but also improves thermal stability. It can show unique advantages in application scenarios that require high-temperature treatment or long-term exposure to harsh environments;

[0048] (3) preparing modified masterbatch, reacting PET and zirconium oxide to obtain composite PET, which can improve bending strength and molding shrinkage. Adding carbon black and toughening agent to the composite PET can change the color and improve toughness. Adding compatibilizer, since the compatibilizer is polymethyl methacrylate grafted with maleic anhydride, not only facilitates compatibility between substances, but also provides antistatic effect;

[0049] (4) preparing a phosphate-carbonate copolymer, introducing graphene as a reinforcing phase into polyaryl phosphate to improve the strength of the polyaryl phosphate, cross-linking polyborosiloxane inside the polyaryl phosphate to limit the thermal motion of the molecular chain, thereby improving the heat resistance and creep resistance, and grafting polytetrafluoroethylene on the outer layer to further improve the corrosion resistance;

[0050] (5) mixing the prepared modified polyester fiber, modified masterbatch and phosphate-carbonate copolymer with other raw materials and drying them, and then heating and extruding them to form solid polymer particles with a certain molecular weight, so that the solid polymer particles are heated to a temperature below their melting point and above their glass transition temperature, and the small molecular products are taken away by inert gas protection, so that the polycondensation reaction is continued and the viscosity is further increased;

[0051] (6) The preparation method of the new polyester fiber protective net for underground coal mines provided by the present invention has a simple process, convenient operation, and saves a lot of manpower and material resources. By selecting high-strength, wear-resistant polyester fiber materials and undergoing careful weaving and other processes, the prepared protective net has excellent physical properties and durability, and is suitable for the complex environment of underground coal mines. It not only improves the safety of operations, but also meets market demand due to its long service life and reasonable cost, and demonstrates good economic and social benefits.

[0052] (7) The embodiments of the present application form a strong and flexible whole through precise cross-interconnection, which has both rigid strength to resist impact and ductility to disperse pressure, and can provide reaction support when subjected to force, effectively preventing coal and rock from loosening and ensuring the safety and stability of the tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0054] Figure 1 A schematic diagram of the molecular structure of a polyaryl phosphate provided in an embodiment of the present invention;

[0055] Figure 2 This is a flow chart of a method for preparing a novel polyester fiber protective net for underground coal mines provided in an embodiment of the present invention;

[0056] Figure 3This is a schematic structural diagram of a novel polyester fiber protective net for underground coal mines provided in an embodiment of the present invention;

[0057] Figure 4 This is a scanning electron microscope image of the new polyester fiber protective net provided in Example 4 of the present invention. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0059] In the examples of the present invention, if there is no special description of raw materials or processing techniques, it is indicated that they are all conventional commercially available raw materials or conventional processing techniques in the art.

[0060] The following describes a new polyester fiber protective net for underground coal mines according to an embodiment of the present application with reference to the accompanying drawings. In response to the problems mentioned in the above background technology that the protective net is easily corroded and has insufficient tensile strength in a high temperature and high humidity environment, the present application provides a new polyester fiber protective net for underground coal mines. The modified polyester fiber can be prepared by reacting the surface of the straw fiber with polylactic acid. At the same time, adding ethylene bisstearamide can reduce heat accumulation and improve the strength of the modified polyester fiber; hafnium oxide is added to the polylactic acid after the grafting reaction to form a coating layer on the surface, which is not only anti-oxidative but also improves thermal stability; a modified masterbatch is prepared, and PET and zirconium oxide are reacted to obtain a composite PET, which can improve the bending strength and molding shrinkage rate. Carbon black and a toughening agent are added to the composite PET to change the color and improve the toughness. A compatibilizer is added. Since the compatibilizer is polymethyl methacrylate, Ester grafted maleic anhydride can provide antistatic effect; prepare phosphate-carbonate copolymer, introduce graphene as reinforcing phase into polyaryl phosphate, improve the strength of polyaryl phosphate, cross-link polyborosiloxane inside polyaryl phosphate, improve heat resistance and creep resistance, graft polytetrafluoroethylene on the outer layer, further improve corrosion resistance; mix the prepared modified polyester fiber, modified masterbatch and phosphate-carbonate copolymer with other raw materials and dry them, then heat and extrude them to continue the polycondensation reaction and further increase the viscosity; by selecting high-strength and wear-resistant polyester fiber materials and undergoing careful weaving and other processes, the prepared protective net has excellent physical properties and durability, and is suitable for the complex environment of coal mines. Thus, the problems of metal protective nets being easily corroded in high temperature and high humidity environments, insufficient tensile strength of non-metallic nets, and difficulty in fully adapting support equipment and technology to complex and changeable mine conditions in the prior art are solved.

[0061] Example 1

[0062] The present application provides a novel polyester fiber protective net for underground coal mines, and the novel polyester fiber protective net comprises the following components by weight:

[0063] Modified polyester fiber: 70 parts;

[0064] Phosphate-carbonate copolymer: 2 parts;

[0065] Antioxidant: 0.06 parts;

[0066] Modified masterbatch: 6 parts;

[0067] Titanate: 3 parts.

[0068] The modified polyester fiber comprises the following components by weight:

[0069] Straw: 10 parts;

[0070] Polylactic acid: 50 parts;

[0071] Ethylene bisstearamide: 0.5 parts;

[0072] Plasticizer: 1 part;

[0073] Hafnium oxide: 1 part;

[0074] Stabilizer: 15 parts;

[0075] Coupling agent: 5 parts.

[0076] Among them, the model of ethylene bisstearamide is KF-1, the plasticizer is one of phthalate and fatty acid ester, the stabilizer is one or more of calcium stearate, zinc stearate and non-toxic phosphite, and the coupling agent is one or more of silane coupling agent, titanate coupling agent and aluminate coupling agent.

[0077] Wherein, the phosphate-carbonate copolymer is 25 parts by weight of polyaryl phosphate, such as Figure 1 As shown, 6 parts by weight of graphene, 2 parts by weight of polyborosiloxane and 0.5 parts by weight of polytetrafluoroethylene are mixed and prepared.

[0078] The antioxidant is one of Irgano1010, Irgano168 and Irgano245.

[0079] Among them, the modified masterbatch contains the following components by weight:

[0080] Carbon black: 3 parts;

[0081] PET: 70 parts

[0082] Toughening agent: 10 parts;

[0083] Zirconia: 1 part;

[0084] Compatibilizer: 2 parts.

[0085] The toughening agent is one of ACR, MBS, POE-g-MAH and E-MA-GMA, and the compatibilizer is polymethyl methacrylate grafted with maleic anhydride.

[0086] The present application also provides a method for preparing a novel polyester fiber protective net for underground coal mines, such as Figure 2 As shown, the following steps are included:

[0087] Step 1: preparing modified polyester fiber, modified masterbatch and phosphate-carbonate copolymer respectively;

[0088] Step 2: Mix the prepared modified polyester fiber, modified masterbatch and phosphate-carbonate copolymer with other raw materials and dry them at a drying temperature of 120° for 5 hours;

[0089] Step 3: heating the dried product to extrude into wire;

[0090] Step 4: stretching the formed product, wherein the heating temperature is 280° C. and the stretching ratio is 4.5 times;

[0091] Step 5: shaping the stretched product, wherein the shaping temperature is 90°C;

[0092] Step 6: subjecting the shaped product to a fourth pulling, wherein the pressure is 0.6 MPa;

[0093] Step 7: Roll up the pulled product and inspect the product result. If the result is qualified, proceed to step 8. Otherwise, directly carry out secondary processing.

[0094] Step 8: Weave the qualified products into a net and reel them up. Figure 3 As shown, the number of wires per meter is 39, the netting setting temperature is 110°C, and the winding length is 30.3 meters.

[0095] Among them, the secondary processing is to cut the unqualified products and crush them, and the processed powder is used to prepare products again.

[0096] Example 2

[0097] The present application provides a novel polyester fiber protective net for underground coal mines, and the novel polyester fiber protective net comprises the following components by weight:

[0098] Modified polyester fiber: 75 parts;

[0099] Phosphate-carbonate copolymer: 2.5 parts;

[0100] Antioxidant: 0.065 parts;

[0101] Modified masterbatch: 6.5 parts;

[0102] Titanate: 3.2 parts.

[0103] The modified polyester fiber comprises the following components by weight:

[0104] Straw: 11 parts;

[0105] Polylactic acid: 55 parts;

[0106] Ethylene bisstearamide: 0.6 parts;

[0107] Plasticizer: 2 parts;

[0108] Hafnium oxide: 2 parts;

[0109] Stabilizer: 16 parts;

[0110] Coupling agent: 6 parts.

[0111] Among them, the model of ethylene bisstearamide is KF-1, the plasticizer is one of phthalate and fatty acid ester, the stabilizer is one or more of calcium stearate, zinc stearate and non-toxic phosphite, and the coupling agent is one or more of silane coupling agent, titanate coupling agent and aluminate coupling agent.

[0112] Wherein, the phosphate-carbonate copolymer is 25 parts by weight of polyaryl phosphate, such as Figure 1 As shown, 6 parts by weight of graphene, 2 parts by weight of polyborosiloxane and 0.5 parts by weight of polytetrafluoroethylene are mixed and prepared.

[0113] The antioxidant is one of Irgano1010, Irgano168 and Irgano245.

[0114] Among them, the modified masterbatch contains the following components by weight:

[0115] Carbon black: 3.5 parts;

[0116] PET: 75 parts

[0117] Toughener: 15 parts;

[0118] Zirconia: 1.5 parts;

[0119] Compatibilizer: 4 parts.

[0120] The toughening agent is one of ACR, MBS, POE-g-MAH and E-MA-GMA, and the compatibilizer is polymethyl methacrylate grafted with maleic anhydride.

[0121] It should be noted that the preparation method of the new polyester fiber protective net for underground coal mines is the same as that in Example 1.

[0122] Example 3

[0123] The present application provides a novel polyester fiber protective net for underground coal mines, and the novel polyester fiber protective net comprises the following components by weight:

[0124] Modified polyester fiber: 80 parts;

[0125] Phosphate-carbonate copolymer: 3 parts;

[0126] Antioxidant: 0.07 parts;

[0127] Modified masterbatch: 7 parts;

[0128] Titanate: 3.4 parts.

[0129] The modified polyester fiber comprises the following components by weight:

[0130] Straw: 12 portions;

[0131] Polylactic acid: 60 parts;

[0132] Ethylene bisstearamide: 0.7 parts;

[0133] Plasticizer: 3 parts;

[0134] Hafnium oxide: 3 parts;

[0135] Stabilizer: 17 parts;

[0136] Coupling agent: 7 parts.

[0137] Among them, the model of ethylene bisstearamide is KF-1, the plasticizer is one of phthalate and fatty acid ester, the stabilizer is one or more of calcium stearate, zinc stearate and non-toxic phosphite, and the coupling agent is one or more of silane coupling agent, titanate coupling agent and aluminate coupling agent.

[0138] Wherein, the phosphate-carbonate copolymer is 25 parts by weight of polyaryl phosphate, such as Figure 1 As shown, 6 parts by weight of graphene, 2 parts by weight of polyborosiloxane and 0.5 parts by weight of polytetrafluoroethylene are mixed and prepared.

[0139] The antioxidant is one of Irgano1010, Irgano168 and Irgano245.

[0140] Among them, the modified masterbatch contains the following components by weight:

[0141] Carbon black: 4 parts;

[0142] PET: 80 parts

[0143] Toughening agent: 20 parts;

[0144] Zirconia: 2 parts;

[0145] Compatibilizer: 5 parts.

[0146] The toughening agent is one of ACR, MBS, POE-g-MAH and E-MA-GMA, and the compatibilizer is polymethyl methacrylate grafted with maleic anhydride.

[0147] It should be noted that the preparation method of the new polyester fiber protective net for underground coal mines is the same as that in Example 1.

[0148] Example 4

[0149] The present application provides a novel polyester fiber protective net for underground coal mines, and the novel polyester fiber protective net comprises the following components by weight:

[0150] Modified polyester fiber: 85 parts;

[0151] Phosphate-carbonate copolymer: 3.5 parts;

[0152] Antioxidant: 0.075 parts;

[0153] Modified masterbatch: 7.5 parts;

[0154] Titanate: 3.8 parts.

[0155] The modified polyester fiber comprises the following components by weight:

[0156] Straw: 14 parts;

[0157] Polylactic acid: 65 parts;

[0158] Ethylene bisstearamide: 0.8 parts;

[0159] Plasticizer: 4 parts;

[0160] Hafnium oxide: 4 parts;

[0161] Stabilizer: 19 parts;

[0162] Coupling agent: 7 parts.

[0163] Among them, the model of ethylene bisstearamide is KF-1, the plasticizer is one of phthalate and fatty acid ester, the stabilizer is one or more of calcium stearate, zinc stearate and non-toxic phosphite, and the coupling agent is one or more of silane coupling agent, titanate coupling agent and aluminate coupling agent.

[0164] Wherein, the phosphate-carbonate copolymer is 25 parts by weight of polyaryl phosphate, such as Figure 1 As shown, 6 parts by weight of graphene, 2 parts by weight of polyborosiloxane and 0.5 parts by weight of polytetrafluoroethylene are mixed and prepared.

[0165] The antioxidant is one of Irgano1010, Irgano168 and Irgano245.

[0166] Among them, the modified masterbatch contains the following components by weight:

[0167] Carbon black: 4.5 parts;

[0168] PET: 85 parts

[0169] Toughener: 25 parts;

[0170] Zirconia: 2.5 parts;

[0171] Compatibilizer: 7 parts.

[0172] The toughening agent is one of ACR, MBS, POE-g-MAH and E-MA-GMA, and the compatibilizer is polymethyl methacrylate grafted with maleic anhydride.

[0173] It should be noted that the preparation method of the new polyester fiber protective net for underground coal mines is the same as that in Example 1.

[0174] Example 5

[0175] The present application provides a novel polyester fiber protective net for underground coal mines, and the novel polyester fiber protective net comprises the following components by weight:

[0176] Modified polyester fiber: 90 parts;

[0177] Phosphate-carbonate copolymer: 4 parts;

[0178] Antioxidant: 0.08 parts;

[0179] Modified masterbatch: 8 parts;

[0180] Titanate: 4 parts.

[0181] The modified polyester fiber comprises the following components by weight:

[0182] Straw: 15 parts;

[0183] Polylactic acid: 70 parts;

[0184] Ethylene bisstearamide: 1 part;

[0185] Plasticizer: 5 parts;

[0186] Hafnium oxide: 5 parts;

[0187] Stabilizer: 20 parts;

[0188] Coupling agent: 8 parts.

[0189] Among them, the model of ethylene bisstearamide is KF-1, the plasticizer is one of phthalate and fatty acid ester, the stabilizer is one or more of calcium stearate, zinc stearate and non-toxic phosphite, and the coupling agent is one or more of silane coupling agent, titanate coupling agent and aluminate coupling agent.

[0190] Wherein, the phosphate-carbonate copolymer is 25 parts by weight of polyaryl phosphate, such as Figure 1 As shown, 6 parts by weight of graphene, 2 parts by weight of polyborosiloxane and 0.5 parts by weight of polytetrafluoroethylene are mixed and prepared.

[0191] The antioxidant is one of Irgano1010, Irgano168 and Irgano245.

[0192] Among them, the modified masterbatch contains the following components by weight:

[0193] Carbon black: 5 parts;

[0194] PET: 90 parts

[0195] Toughening agent: 30 parts;

[0196] Zirconia: 3 parts;

[0197] Compatibilizer: 8 parts.

[0198] The toughening agent is one of ACR, MBS, POE-g-MAH and E-MA-GMA, and the compatibilizer is polymethyl methacrylate grafted with maleic anhydride.

[0199] It should be noted that the preparation method of the new polyester fiber protective net for underground coal mines is the same as that in Example 1.

[0200] Performance Testing

[0201] The tensile strength, elongation, corrosion resistance and flame retardancy of a novel polyester fiber protective net for underground coal mines prepared in Examples 1-5 were tested respectively. To test the corrosion resistance, a section of the protective net was placed in a 1 mol / L acid solution prepared with hydrochloric acid and a sodium hydroxide alkali solution with a mass concentration of 15%. After soaking for 24 hours, the surface was observed. The performance test is shown in Table 1.

[0202] Table 1 Performance test of new polyester fiber protective net

[0203]

[0204]

[0205] like Figure 4 As shown in Table 1, the new polyester fiber protective net in the embodiment of the present invention has strong tensile strength and high elongation. At the same time, it has good corrosion resistance, obvious flame retardant properties, and excellent properties such as biodegradability, and can be produced on a large scale at low cost.

[0206] By adopting the preparation method of the new polyester fiber protection net for underground coal mines provided by the present invention, the tensile strength and elongation of Example 4 are optimal, with the tensile strength reaching 2650N and the elongation reaching 22%. At the same time, the corrosion resistance and flame retardancy are excellent. It can be seen that the introduced materials need to be within a certain amount, and adding too much or too little will affect the performance. Therefore, considering the comprehensive performance influence of the new polyester fiber protection net for underground coal mines, the new polyester fiber protection net for underground coal mines of the present invention improves the material properties under degradable conditions, makes the corrosion resistance and flame retardancy effects obvious, and reduces the production cost at the same time, and has a high use value.

[0207] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0208] The present invention and its implementation methods are described above, and such description is not restrictive, and the actual application is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design structures and embodiments similar to the technical solution without creativity, which should all fall within the protection scope of the present invention.

Claims

1. A new polyester fiber protective net for underground coal mines, characterized in that: The novel polyester fiber protective net comprises the following components by weight: Modified polyester fiber: 60-100 parts; Phosphate-carbonate copolymer: 1-5 parts; Antioxidant: 0.05-0.1 parts; Modified masterbatch: 5-10 parts; Titanate: 1-5 parts.

2. A novel polyester fiber protective net for underground coal mines according to claim 1, characterized in that: The novel polyester fiber protective net comprises the following components by weight: Modified polyester fiber: 70-90 parts; Phosphate-carbonate copolymer: 2-4 parts; Antioxidant: 0.06-0.08 parts; Modified masterbatch: 6-8 parts; Titanate: 3-4 parts.

3. A new polyester fiber protective net for underground coal mines according to claim 2, characterized in that: The modified polyester fiber comprises the following components by weight: Straw: 10-15 portions; Polylactic acid: 50-70 parts; Ethylene bisstearamide: 0.5-1 part; Plasticizer: 1-5 parts; Hafnium oxide: 1-5 parts; Stabilizer: 15-20 parts; Coupling agent: 5-8 parts.

4. A novel polyester fiber protective net for underground coal mines according to claim 3, characterized in that: The model of the ethylene bisstearamide is KF-1, the plasticizer is one of phthalate and fatty acid ester, the stabilizer is one or more of calcium stearate, zinc stearate and non-toxic phosphite, and the coupling agent is one or more of silane coupling agent, titanate coupling agent and aluminate coupling agent.

5. The novel polyester fiber protective net for underground coal mines according to claim 2 is characterized in that: The phosphate-carbonate copolymer is prepared by mixing 25 parts by weight of polyaryl phosphate, 6 parts by weight of graphene, 2 parts by weight of polyborosiloxane and 0.5 parts by weight of polytetrafluoroethylene.

6. The novel polyester fiber protective net for underground coal mines according to claim 5, characterized in that: The antioxidant is one of Irgano1010, Irgano168 and Irgano245.

7. A novel polyester fiber protective net for underground coal mines according to claim 6, characterized in that: The modified masterbatch comprises the following components by weight: Carbon black: 5-10 parts; PET: 70-90 parts Toughening agent: 10-30 parts; Zirconia: 1-3 parts; Compatibilizer: 2-8 parts.

8. The novel polyester fiber protective net for underground coal mines according to claim 7, characterized in that: The toughening agent is one of ACR, MBS, POE-g-MAH and E-MA-GMA, and the compatibilizer is polymethyl methacrylate grafted with maleic anhydride.

9. The method for preparing a novel polyester fiber protective net for underground coal mines according to claim 1, characterized in that: The steps include: Step 1: preparing modified polyester fiber, modified masterbatch and phosphate-carbonate copolymer respectively; Step 2: Mixing the prepared modified polyester fiber, modified masterbatch and phosphate-carbonate copolymer with other raw materials and drying them, wherein the drying temperature is 120° and the drying time is 5 hours; Step 3: heating the dried product to extrude into wire; Step 4: stretching the formed product, wherein the heating temperature is 280° C. and the stretching ratio is 4.5 times; Step 5: shaping the stretched product, wherein the shaping temperature is 90° C. Step 6: subjecting the shaped product to a fourth pulling, wherein the pressure is 0.6 MPa; Step 7: Roll up the pulled product and inspect the product result. If the result is qualified, proceed to step 8. Otherwise, directly carry out secondary processing. Step 8: Weave the qualified products into a net, thread the wires and reel them up, wherein the threading amount is 39 wires per meter, the netting setting temperature is 110°C, and the reeling length is 30.3 meters.

10. The method for preparing a novel polyester fiber protective net for underground coal mines according to claim 9, characterized in that: The secondary treatment is to cut the unqualified products and crush them, and the processed powder is used to prepare products again.

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