A wear-resistant plastic woven bag and a preparation process thereof

Abstract

The application discloses a wear-resistant plastic woven bag and a preparation process thereof. The plastic woven bag comprises an outer bag woven by a woven material, and the woven material comprises the following components in parts by weight: 100 parts of PP; and 12.7-37.6 parts of a modified wear-resistant agent. The modified wear-resistant agent is obtained by calcining a two-phase material at 1280-1340 DEG C, the two-phase material is a mixture of zirconium dioxide and carbon black, the mass ratio of zirconium dioxide to carbon black in the two-phase material is 100: (12.1-46.7), the loss rate of C element of the two-phase material after calcination is 77.7-96.2%, and the porosity of the modified wear-resistant agent is 8.4-24.3%. In the case of guaranteeing the original tensile property of the outer bag of the woven bag, the wear-resistant property of the outer bag of the woven bag is effectively and significantly improved.

Description

TECHNICAL FIELD

[0001] The application relates to a packaging material, in particular to a wear-resistant plastic woven bag and a preparation process thereof. BACKGROUND

[0002] The plastic woven bag is prepared by taking polypropylene as a main raw material, extruding, stretching into a flat wire, weaving, weaving, and making an outer bag, and then adding or not adding an inner lining bag according to the needs of the packaging material. In the use process, the outer bag frequently contacts and rubs against external objects, so that the material of the outer bag has a higher wear resistance requirement. At present, the wear resistance of the polypropylene material is improved, and the use of the reinforcing fiber will affect the thickness of the polypropylene thin strip, so in the field of woven bag production, the wear-resistant powder material is generally added to improve the wear resistance of the outer bag material.

[0003] The wear-resistant powder material improves the wear resistance of the outer bag material mainly based on two aspects:

[0004] 1. The wear-resistant powder material is mixed into the material to replace the non-wear-resistant PP and the external contact, and the overall wear of the outer bag material is reduced when the wear occurs;

[0005] 2. The wear-resistant powder material and the interface bonding strength of the wrapped organic material and the toughness of the organic material determine the wear of the outer bag material when the wear-resistant powder replaces the PP and the external friction occurs.

[0006] The high-hardness and high-wear-resistant powder material that can meet the wear resistance requirement of the outer bag material in the prior art is relatively mature, such as zirconium dioxide powder and silicon carbide powder, but the compatibility and interface bonding strength of the surface of the material and the PP material are generally not high, so the application is expected to further improve from the second aspect to obtain a plastic woven bag with better wear resistance. SUMMARY

[0007] In order to obtain a plastic woven bag with better wear resistance, a wear-resistant plastic woven bag and a preparation process thereof are provided.

[0008] The above first application object of the application is realized by the following technical scheme:

[0009] A wear-resistant plastic woven bag comprises an outer bag woven by a woven material, and the woven material comprises the following components by weight:

[0010] PP 100 parts;

[0011] Modified wear-resistant agent 12.7-37.6 parts;

[0012] The modified wear-resistant agent is a double-phase material calcined at 1280-1340 DEG C,

[0013] The dual-phase material is a mixture of zirconium dioxide and carbon black, the mass ratio of zirconium dioxide and carbon black in the dual-phase material is 100: (12.1-46.7), and the loss rate of C element of the dual-phase material after calcination is 77.7-96.2%,

[0014] The porosity of the modified wear-resistant agent is 8.4-24.3%.

[0015] By adopting the above technical scheme, the modified wear-resistant agent is obtained by high-temperature calcination of the dual-phase material. During the high-temperature calcination process:

[0016] The zirconium dioxide contact interface is co-melted to make the dual-phase material densified and the overall strength improved;

[0017] The carbon black is first decomposed by heat and then ashed by further heat, and the original carbon black occupies the space vacancy;

[0018] Therefore, the modified wear-resistant agent obtained by treating the dual-phase material is mainly a zirconium dioxide sintering body mixed with a high-temperature residual C element product, the structure strength between the zirconium dioxide is high, and the C element product is attached to the pore wall,

[0019] When the modified wear-resistant agent is mixed with PP and melted, the PP is filled into the pores under extrusion, and the bonding strength between the PP and the modified wear-resistant agent is improved;

[0020] Meanwhile, the inner wall of the modified wear-resistant agent after high-temperature calcination is relatively smooth due to the surface tension of the co-melt, the PP is filled quickly, and the PP filled in the pores is not easy to be cut and worn by the side of the pore wall and broken when the obtained material is subjected to tension or torsion.

[0021] Therefore, the modified wear-resistant agent in the PP material of the present application has excellent wear resistance, the bonding strength between the modified wear-resistant agent and the PP is high, and the toughness of the PP at the bonding interface is good, so compared with adding a large amount of wear-resistant agent to sacrifice the tensile properties of the woven bag outer bag material to greatly improve the wear resistance of the woven bag outer bag, the present application effectively and significantly improves the wear resistance of the woven bag outer bag while ensuring the original tensile properties of the woven bag outer bag.

[0022] Optionally, the particle size of the modified wear-resistant agent is 60±1 μm.

[0023] By adopting the above technical scheme, when the particle size of the modified wear-resistant agent is 60±1 μm, the wear resistance of the woven bag outer bag is improved more significantly.

[0024] Optionally, the mass ratio of zirconium dioxide and carbon black in the modified wear-resistant agent is 100: (27.6-46.7), and the loss rate of C element of the dual-phase material after calcination is 77.7-92.1%.

[0025] By adopting the technical scheme, the mass ratio of zirconium dioxide and carbon black, and the C element loss rate of the dual-phase material after calcination affect the porosity of the modified wear-resistant agent and the excess C element product, the excess C element product has the effect of enhancing the bonding interface strength when the modified wear-resistant agent is mixed with PP, and the enhancement effect is related to the porosity of the modified wear-resistant agent and the amount of the excess C element product, and when the mass ratio of zirconium dioxide and carbon black is 100: (27.6-46.7) and the C element loss rate of the dual-phase material after calcination is 77.7-92.1 %, the effect is more obvious.

[0026] Optionally, the porosity of the modified wear-resistant agent is 17.6-24.3 %.

[0027] Optionally, the modified wear-resistant agent is 26.5-37.6 parts.

[0028] By adopting the technical scheme, the wear resistance and tensile properties of the woven bag outer bag are both relatively good.

[0029] Optionally, the preparation method of the modified wear-resistant agent comprises the following steps:

[0030] The zirconium hydroxide gel is uniformly mixed with carbon black, and then is fired under a non-oxidizing atmosphere, and is finely processed after being broken to obtain the modified wear-resistant agent.

[0031] By adopting the technical scheme, since the density difference between zirconium dioxide and carbon black is relatively large, the distribution of carbon black in the obtained mixture of the zirconium hydroxide gel and carbon black is more uniform than that in the mixture of zirconium dioxide directly mixed with carbon black, and the obtained modified wear-resistant agent is more excellent in improving the wear resistance and tensile properties of the woven bag outer bag.

[0032] Optionally, white oil is further included, and the white oil has a boiling point greater than 180 DEG C.

[0033] By adopting the technical scheme, the addition of white oil with an appropriate boiling point can make the modified wear-resistant agent uniformly adhere to the surface of PP particles after being contaminated with white oil when the raw materials of the woven bag outer bag are premixed, and the material mixing is more uniform.

[0034] The above-mentioned second invention purpose of the application is realized by the following technical scheme:

[0035] A preparation process of a wear-resistant plastic woven bag,

[0036] S1: The above-mentioned raw materials are premixed according to the proportion to obtain premixed raw materials;

[0037] S2: The premixed raw materials are processed through heating, melt extruder, wire drawing, weaving, braiding, bag making and other processes to obtain the outer bag.

[0038] By adopting the technical scheme, a plastic woven bag with excellent wear resistance is obtained.

[0039] In summary, the present application has at least the following beneficial effects:

[0040] The modified wear-resistant agent in the PP material of the present application has excellent wear resistance, high bonding strength between the modified wear-resistant agent and the PP, and good toughness of the PP at the bonding interface. Therefore, compared with adding a large amount of wear-resistant agent to sacrifice the tensile properties of the woven bag outer bag material to greatly improve the wear resistance of the woven bag outer bag, the present application effectively and significantly improves the wear resistance of the woven bag outer bag while ensuring the original tensile properties of the woven bag outer bag. DETAILED DESCRIPTION

[0041] Raw materials:

[0042] The carbon black was purchased from Tianjin Yibo Rui Chemical Co., Ltd. F900A product, particle size 20~30nm;

[0043] The PP was purchased from Yanshan Petrochemical, and the grade K4912 and the grade K8303 were compounded according to the mass ratio of 6.4:3.6.

[0044] The zirconium hydroxide gel was self-made, and the preparation method was as follows: zirconium chloride and cold water were mixed according to the mass ratio of 1:10, stirred and uniformly dispersed, sodium hydroxide solution was added dropwise to adjust the liquid pH to 8, and the stirring was continued and gradually heated to 45℃, and the temperature was maintained for 1h, and the liquid pH was adjusted to 9.5 by continuously adding sodium hydroxide solution, and the pH was maintained between 9~9.5 by continuously adding sodium hydroxide solution, until there was no new precipitation, and after filtration and washing, the washing liquid was Cl - free, and the zirconium hydroxide gel containing water was obtained.

[0045] The white oil was 32# white oil, and the boiling point was 225~325℃.

[0046] Preparation example 1

[0047] The modified wear-resistant agent was prepared by the following method:

[0048] The zirconium hydroxide gel, carbon black, and mixing aid were weighed according to the proportion and stirred for 5h to obtain a mixture;

[0049] The mixture was then filtered and dried, and then calcined at 1340℃ in a mixed atmosphere of N2 and H2 (during the calcination heating process, when the mixture was heated to 500℃, the zirconium hydroxide began to decompose, and when the calcination environment was heated to 600℃, the zirconium hydroxide had completely completed dehydration to form zirconium dioxide, and the mixture was converted into a two-phase material of zirconium dioxide and carbon black). After calcination, the powder was crushed to obtain a powder, and then sieved to obtain a modified wear-resistant agent with a particle size of 60±1μm.

[0050] The mixing aid is a liquid with a boiling point of 25-99℃, which does not react with the zirconium hydroxide gel and carbon black, and is water-soluble, and can be ethanol, acetone, methanol, etc., and here is ethanol.

[0051] The water content in the zirconium hydroxide gel is 32-35wt%, and here is 34wt%;

[0052] The mass ratio of the zirconium hydroxide gel, carbon black, and mixing aid is 308:35.7:130.6, and the mass ratio of the zirconium dioxide to carbon black is 100:35.7.

[0053] The amount of zirconium dioxide = the amount of zirconium hydroxide gel * (1-water content in the zirconium hydroxide gel) * the molar mass of zirconium dioxide ÷ the molar mass of zirconium hydroxide

[0054] The amount of the mixing aid is 0.38 of the total mass of the zirconium hydroxide gel and carbon black.

[0055] The volume ratio of N2 to H2 in the mixed atmosphere is 65.4:34.6, and the calcination time of the mixture is 4.5h.

[0056] The obtained modified wear-resistant agent is detected to have a porosity of 17.6% and a C content of 3.35wt%, and the calculated loss rate of C before and after calcination is 90.3%.

[0057] Preparation Examples 2-5

[0058] The modified wear-resistant agent is different from that of Preparation Example 1 in that the particle size used for screening and selecting the modified wear-resistant agent after preparation is different.

[0059] The particle size used for screening and selecting the modified wear-resistant agent of Preparation Example 2 is 5±1μm.

[0060] The particle size used for screening and selecting the modified wear-resistant agent of Preparation Example 3 is 20±1μm.

[0061] The particle size used for screening and selecting the modified wear-resistant agent of Preparation Example 4 is 80±1μm.

[0062] The particle size used for screening and selecting the modified wear-resistant agent of Preparation Example 5 is 200±1μm.

[0063] Preparation Examples 6-11

[0064] The modified wear-resistant agent is different from that of Preparation Example 1 in that the mass ratio of the amount of the zirconium hydroxide gel, carbon black, and mixing aid is different.

[0065] The mass ratio of the amount of the zirconium hydroxide gel and carbon black is as follows, and the mixing aid is kept at 0.38 of the total mass of the zirconium hydroxide gel and carbon black.

[0066]

[0067] The modified wear-resistant agent obtained in Preparation Example 6~10 is characterized as follows:

[0068]

[0069] Preparation Example 11

[0070] The modified wear-resistant agent, which is different from Preparation Example 1, is that the mass ratio of zirconium hydroxide gel, carbon black and mixing aid is 308:48.7:137.8; the calcination temperature of the mixture is 1280℃, the calcination time is 7.6h, and the volume ratio of N2 to H2 in the mixed atmosphere during calcination is 69.4:30.6.

[0071] The modified wear-resistant agent obtained in Preparation Example 12 is characterized and detected as follows: the C element loss rate is 90.8%, the porosity is 18.3%, the C content is 3.48wt%, and the C element loss rate is 92.1%.

[0072] Preparation Example 12

[0073] A wear-resistant agent is prepared by the following method:

[0074] The zirconium hydroxide gel, carbon black and mixing aid are weighed according to the proportion and stirred for 5h to be uniformly mixed to obtain a mixture;

[0075] The mixture is then filtered, dried, and compacted under pressure, and then calcined at 600℃ under a mixed atmosphere of N2 for 4.5h. After calcination, the powder is crushed and then sieved to obtain a modified wear-resistant agent with a particle size of 60±1μm.

[0076] The mixing aid is ethanol, and the water content of the zirconium hydroxide gel is 34wt%;

[0077] The mass ratio of the zirconium hydroxide gel, carbon black and mixing aid is 308:3.46:118.4. The zirconium hydroxide gel is converted into zirconium dioxide, and the mass ratio of zirconium dioxide to carbon black is 100:3.46.

[0078] The obtained wear-resistant agent is detected to have a porosity of 17.8%.

[0079] Example 1

[0080] A wear-resistant plastic woven bag includes an outer bag woven from a woven material. The woven material of the outer bag is prepared from the following raw materials in mass parts: PP 100 parts, modified wear-resistant agent 26.5 parts, and white oil 4.3 parts.

[0081] The preparation method of the woven material of the outer bag is as follows:

[0082] S1: Put 100kg of PP, 26.5kg of modified wear-resistant agent and 4.3kg of white oil into a premixer and stir to mix uniformly to obtain a premixed raw material;

[0083] S2: The premixed raw materials are sent to a screw extruder, and the raw materials are melted and mixed by heating at 172°C to obtain a melt, and then the melt is extruded and drawn into a string to obtain the woven material.

[0084] The modified wear-resistant agent is prepared according to Preparation Example 1.

[0085] The woven material is further woven, braided, and bagged to obtain the outer bag.

[0086] Comparative Example 1

[0087] A wear-resistant plastic woven bag, which differs from Example 1 in that the woven material of the outer bag is prepared from the following raw materials in parts by mass: PP 100 parts, white oil 4.3 parts, and the premixed raw materials are prepared by mixing PP and white oil.

[0088] Comparative Example 2

[0089] A wear-resistant plastic woven bag, which differs from Example 1 in that the woven material of the outer bag is prepared from the following raw materials in parts by mass: PP 100 parts, zirconium dioxide powder 26.5 parts, and white oil 4.3 parts, and the premixed raw materials are prepared by mixing PP, zirconium dioxide powder, and white oil.

[0090] Comparative Example 3

[0091] A wear-resistant plastic woven bag, which differs from Example 1 in that the woven material of the outer bag is prepared from the following raw materials in parts by mass: PP 100 parts, zirconium dioxide powder 25.61 parts, carbon black 0.89 parts, and white oil 4.3 parts, and the premixed raw materials are prepared by mixing PP, zirconium dioxide powder, carbon black, and white oil.

[0092] Comparative Example 4

[0093] A wear-resistant plastic woven bag, which differs from Example 1 in that the modified wear-resistant agent used is prepared according to Preparation Example 12.

[0094] The wear resistance and tensile property of Example 1 and Comparative Examples 1-4 are tested.

[0095] Wear resistance test: The test is carried out according to GB / T 3960, and the test sample is obtained by extruding the melt obtained in S2.

[0096] Tensile property test: The test is carried out according to GB / T13022, and the test sample is obtained by extruding and drawing the melt obtained in S2.

[0097] The test results of Example 1 and Comparative Examples 1-3 are as follows.

[0098] Table 1. Wear resistance and tensile property test results of Example 1 and Comparative Examples 1-3

[0099]

[0100] As can be seen from Table 1, the wear rate of the braided material of Example 1 and Comparative Example 1 is reduced, and the tensile strength is improved, compared with Comparative Example 1 without the addition of wear-resistant agent, and the wear-resistant agent is replaced by an equal amount of zirconium dioxide in Example 1 and Comparative Example 2.

[0101] The wear rate reduction and tensile strength improvement of Example 1 are more significant than those of Comparative Example 2.

[0102] In Comparative Example 3, the residual C element content ratio in Preparation Example 1 is replaced by zirconium dioxide powder and carbon black to replace the modified wear-resistant agent in Example 1; in Comparative Example 4, the residual C element content ratio in Preparation Example 1 is mixed with zirconium hydroxide gel and carbon black, and the mixture is calcined in a pure nitrogen environment to decompose the zirconium hydroxide gel into zirconium oxide, while the carbon black does not decompose.

[0103] As can be seen from the test results of Comparative Examples 3-4, the wear rate and tensile strength of Comparative Examples 3-4 do not reach the level of Example 1, and Example 1 still has a significant advantage over Comparative Examples 3-4. The wear rate reduction of Comparative Examples 3-4 is much less than the difference between Example 1 and Comparative Example 2, and the tensile strength of Comparative Examples 3-4 has decreased compared with Comparative Example 2.

[0104] The modified wear-resistant agent of Preparation Example 1 used in Example 1 is co-melted at the interface of zirconium dioxide during high-temperature calcination, which makes it denser and improves its overall strength. Unlike the carbon black in Comparative Example 4, which does not decompose, the carbon black in Preparation Example 1 gradually decomposes and ash during calcination. The original carbon black occupies space, which makes the modified wear-resistant agent obtained after treatment of the dual-phase material mainly zirconium dioxide sintered body mixed with the remaining C element product after high-temperature treatment, with high structural strength between zirconium dioxide and pores with C element product on the pore wall surface.

[0105] PP is filled into the pores under extrusion when the PP phase is mixed and melted, which enhances the binding strength of PP and the modified wear-resistant agent; the inner wall of the pores of the modified wear-resistant agent after high-temperature calcination is relatively smooth due to the surface tension of the eutectic melt during eutectic melting, the PP is filled quickly, and the PP filled into the pores is not easy to be cut and worn by the side of the pore wall and broken when the obtained material is subjected to tension or torsion, so that the modified wear-resistant agent in the PP material of the application has excellent wear resistance, the binding strength between the modified wear-resistant agent and the PP is high, and the toughness of the PP at the binding interface is good, so compared with adding a large amount of wear-resistant agent to sacrifice the tensile properties of the woven bag outer bag material to greatly improve the wear resistance of the woven outer bag, the application effectively and significantly improves the wear resistance of the woven outer bag under the condition of ensuring the original tensile properties of the woven bag outer bag.

[0106] Comparative Example 5

[0107] A wear-resistant plastic woven bag, which is different from Example 1 in that the modified wear-resistant agent in the raw material of the woven material of the outer bag is prepared by Preparation Example 2.

[0108] Example 2

[0109] A wear-resistant plastic woven bag, which is different from Example 1 in that the modified wear-resistant agent in the raw material of the woven material of the outer bag is prepared by Preparation Example 3.

[0110] Example 3

[0111] A wear-resistant plastic woven bag, which is different from Example 1 in that the modified wear-resistant agent in the raw material of the woven material of the outer bag is prepared by Preparation Example 4.

[0112] Comparative Example 6

[0113] A wear-resistant plastic woven bag, which is different from Example 1 in that the modified wear-resistant agent in the raw material of the woven material of the outer bag is prepared by Preparation Example 5.

[0114] The wear resistance and tensile properties of Examples 2-3 and Comparative Examples 2-3 were tested, and the test results of Examples 2-5 are as follows.

[0115] Table 2. Wear resistance and tensile property test results of Examples 2-5

[0116]

[0117] In combination with Table 1 and Table 2, the particle size of the modified wear-resistant agent of the application will affect the effect of the modified wear-resistant agent due to its structural characteristics;

[0118] As shown in Comparative Example 5, the particle size of the modified wear-resistant agent used is too small. Since the PP itself has a certain elasticity, the modified wear-resistant agent will be pressed into the surface of the PP material when subjected to pressure and adhesive wear. The PP material continues to be abraded, resulting in a significant increase in the wear rate compared with Example 1, a substantial reduction in the wear resistance improvement, and even less than Comparative Example 2.

[0119] As shown in Comparative Example 6, the particle size of the modified wear-resistant agent used is too large, and the internal pore space is too much. The adhesive PP melt during production cannot fill all the pores, so there are hollow pores in the modified wear-resistant agent, and the hollow pores increase with the increase of the particle size of the modified wear-resistant agent. Relatively speaking, the overall tensile and compressive strength of the modified wear-resistant agent particles decreases, and finally the material of Comparative Example 6 is easy to appear the modified wear-resistant agent particles are broken during the friction process and the stretching process. Therefore, compared with Example 3, the wear rate of Comparative Example 6 increases, and the tensile strength decreases.

[0120] In summary, in order to obtain good wear resistance improvement effect and good tensile strength, the particle size of the modified wear-resistant agent is 20-80 μm, and the optimal particle size is 60±1 μm.

[0121] Example 4

[0122] A wear-resistant plastic woven bag, which comprises a woven outer bag. The woven material of the outer bag is prepared from the following raw materials in parts by mass: PP 100 parts, modified wear-resistant agent 12.7 parts, white oil 2.1 parts.

[0123] Example 5

[0124] A wear-resistant plastic woven bag, which comprises a woven outer bag. The woven material of the outer bag is prepared from the following raw materials in parts by mass: PP 100 parts, modified wear-resistant agent 19.6 parts, white oil 2.8 parts.

[0125] Example 6

[0126] A wear-resistant plastic woven bag, which comprises a woven outer bag. The woven material of the outer bag is prepared from the following raw materials in parts by mass: PP 100 parts, modified wear-resistant agent 37.6 parts, white oil 3.8 parts.

[0127] Comparative Example 7

[0128] A wear-resistant plastic woven bag, which is different from Example 1 in that the woven material of the outer bag is prepared from the following raw materials in parts by mass: PP 100 parts, modified wear-resistant agent 5.6 parts, white oil 0.9 parts.

[0129] Comparative Example 8

[0130] A wear-resistant plastic woven bag, which is different from example 1 in that the woven material of the outer bag is prepared from the following mass parts of raw materials: PP 100 parts, modified wear-resistant agent 54.6 parts, white oil 7.6 parts.

[0131] Examples 4-6 and Comparative Examples 7-8 are subjected to wear resistance test and tensile property test, and the test results of Examples 4-6 and Comparative Examples 7-8 are as follows.

[0132] Table 3. Wear resistance and tensile property test results of Examples 4-6 and Comparative Examples 7-8

[0133]

[0134] In combination with Table 1 and Table 3, the detection results of Comparative Example 1, Examples 4-6, and Comparative Examples 7-8 show the influence of the amount of modified wear-resistant agent on the wear resistance and tensile property of the finished outer bag woven material in the present application.

[0135] The amount of modified wear-resistant agent in Comparative Example 7, Example 4, Example 5, Example 1, Example 6, and Comparative Example 8 is gradually increased,

[0136] In Comparative Example 7, Example 4, Example 5, Example 1, and Example 6, as the amount of modified wear-resistant agent increases, the wear rate gradually decreases and the tensile strength gradually increases. At this time, the amount of modified wear-resistant agent is within the mixing limit of the amount of PP; when the mass ratio of the amount of modified wear-resistant agent to the amount of PP reaches 54.6:100, i.e., in Comparative Example 8, the amount of modified wear-resistant agent is too large, the internal bonding force of the finished outer bag woven material decreases, resulting in an increase in wear rate and a decrease in tensile strength,

[0137] Meanwhile, the amount of modified wear-resistant agent in Comparative Example 7 is too small, and the improvement is weak compared with the prior art,

[0138] In summary, in the present application, when the amount of PP is 100 parts by mass, the amount of modified wear-resistant agent is preferably 12.7-37.6 parts by mass, and more preferably 26.5-37.6 parts by mass, at which the amount of modified wear-resistant agent and the synergistic effect reach a good balance.

[0139] In the present application, the ratio of the amount of zirconium hydroxide gel to carbon black during the preparation of the modified wear-resistant agent, the atmosphere during the calcination of the mixture, the calcination temperature, and the calcination time all affect the molding of the obtained modified wear-resistant agent, which is reflected in the characterization parameters, i.e., porosity and residual C element content. Therefore, further research is conducted.

[0140] Comparative Example 9

[0141] A wear-resistant plastic woven bag, which is different from example 1 in that the used modified wear-resistant agent is prepared from Preparation Example 6.

[0142] Example 7

[0143] A wear-resistant plastic woven bag, which differs from Example 1 in that the modified wear-resistant agent used is prepared from Preparation Example 7.

[0144] Example 8

[0145] A wear-resistant plastic woven bag, which differs from Example 1 in that the modified wear-resistant agent used is prepared from Preparation Example 8.

[0146] Example 9

[0147] A wear-resistant plastic woven bag, which differs from Example 1 in that the modified wear-resistant agent used is prepared from Preparation Example 9.

[0148] Comparative Example 10

[0149] A wear-resistant plastic woven bag, which differs from Example 1 in that the modified wear-resistant agent used is prepared from Preparation Example 10.

[0150] Example 10

[0151] A wear-resistant plastic woven bag, which differs from Example 1 in that the modified wear-resistant agent used is prepared from Preparation Example 11.

[0152] The wear resistance and tensile property tests of Examples 7-10 and Comparative Examples 9-10 are carried out, and the test results of Examples 7-10 and Comparative Examples 9-10 are as follows.

[0153] Table 4. Wear resistance and tensile property test results of Examples 7-10 and Comparative Examples 9-10

[0154]

[0155] In combination with Table 1 and Table 4, the amounts of zirconium hydroxide gel and carbon black used in the preparation of the modified wear-resistant agent used in Comparative Examples 9-10 and Examples 7-9 are different, and the porosities and C element contents of the obtained modified wear-resistant agents are also different. After being applied to the outer bag woven material, the wear rates and tensile properties of the obtained outer bag woven materials are as shown in Table 4. Among them, the wear resistance of Examples 7-8 is significantly improved compared with the direct addition of zirconium dioxide in the prior art, and the tensile property is not weaker than that of the prior art.

[0156] Furthermore, by comparing Example 1 and Example 10, it can be known that the modified wear-resistant agent used in Example 10 is obtained by adjusting the ratio of the amount of zirconium hydroxide gel and carbon black, and simultaneously adjusting the calcination temperature, calcination time and calcination atmosphere to obtain a modified wear-resistant agent with similar porosity and C element content to the modified wear-resistant agent used in Example 1. The wear rate and tensile property of the outer bag woven material of Example 10 are similar to those of Example 1.

[0157] In combination with the comparison results of Table 1 and Table 2, the influence of the modified wear-resistant agent on the wear resistance and tensile strength of the outer woven bag material in the application depends on the structural changes, porosity, changes in the flatness of the pore surface before and after calcination, and the content of residual C element of the modified wear-resistant agent after calcination,

[0158] The modified wear-resistant agent in the application needs to be calcined at 1280-1340℃ with the mass ratio of zirconium dioxide and carbon black being 100: (12.1-46.7) to obtain excellent modification performance. After calcination, the C element loss rate is 77.7-96.2%, the particle size of the modified wear-resistant agent is controlled to be 20-80μm, and the porosity is 8.4-24.3%, so as to achieve an effect beyond the level of the prior art.

[0159] Example 11

[0160] A wear-resistant plastic woven bag, which is different from Example 1 in that no white oil is added to the mixed raw materials, and only PP and modified wear-resistant agent are mixed.

[0161] Example 11 is subjected to wear resistance test and tensile property test, and the test results are wear rate 1.46 / m 3 ·N -1 ·m -1 , and tensile strength 75.6MPa.

[0162] The addition of white oil can make the modified wear-resistant agent adhere uniformly to the surface of PP particles after being contaminated with white oil when the raw materials of the outer bag of the woven bag are premixed, and the material mixing is more uniform, so that the wear resistance and tensile properties of the outer woven material of the woven bag are improved.

[0163] At the same time, for the process production requirements, the white oil must not be boiled and gasified in the screw extruder, so the boiling point of the white oil is selected to be higher than the process melting extrusion temperature and needs to be higher than a certain value, which is higher than 180℃ here.

[0164] This specific embodiment is only an explanation of the application and is not a limitation of the application. Those skilled in the art can make modifications to this embodiment without creative contribution after reading the specification, but as long as it is within the scope of the claims of the application, it is protected by the patent law.

Claims

1. A wear-resistant plastic woven bag, characterized in that, The bag includes an outer bag made of a woven material, wherein the woven material comprises the following raw materials in parts by weight: 100 PP sheets; Modified wear-resistant agent 12.7~37.6 parts; The modified wear-resistant agent is obtained by calcining a duplex material at 1280~1340℃. The dual-phase material is a mixture of zirconium dioxide and carbon black, with a mass ratio of zirconium dioxide to carbon black of 100:(12.1~46.7). The carbon element loss rate after calcination of the dual-phase material is 77.7~96.2%. The modified wear-resistant agent has a porosity of 8.4~24.3%; The modified wear-resistant agent has a particle size of 20~80μm; The modified wear-resistant agent is prepared as follows: Weigh zirconium hydroxide gel, carbon black, and mixing aid according to the proportions and stir for 5 hours until they are evenly mixed to obtain a mixture. The mixture is then filtered, dried, and calcined in a mixed atmosphere of N2 and H2. After calcination, it is pulverized to obtain powder, which is then sieved to obtain a modified wear-resistant agent. The mixing aid is a liquid with a boiling point of 25~99℃ that does not react with zirconium hydroxide gel or carbon black and is miscible with water; The modified wear-resistant agent converts zirconium hydroxide gel into zirconium dioxide. The amount of zirconium dioxide = amount of zirconium hydroxide gel * (1 - water content in zirconium hydroxide gel) * molar mass of zirconium dioxide ÷ molar mass of zirconium hydroxide.

2. The wear-resistant plastic woven bag according to claim 1, characterized in that, The modified wear-resistant agent has a particle size of 60±1μm.

3. The wear-resistant plastic woven bag according to claim 1, characterized in that, The mass ratio of zirconium dioxide to carbon black in the modified wear-resistant agent is 100:(27.6~46.7), and the carbon element loss rate of the dual-phase material after calcination is 77.7~92.1%.

4. The wear-resistant plastic woven bag according to claim 1, characterized in that, The porosity of the modified wear-resistant agent is 17.6~24.3%.

5. A wear-resistant plastic woven bag according to claim 1, characterized in that, The modified wear-resistant agent is present in amounts of 26.5 to 37.6 parts.

6. A wear-resistant plastic woven bag according to claim 1, characterized in that, The raw materials for weaving materials also include white oil, which has a boiling point greater than 180°C.

7. The manufacturing process of a wear-resistant plastic woven bag according to any one of claims 1 to 6, characterized in that: S1: Premix the raw materials according to the formula to obtain premixed raw materials; S2: The premixed raw materials are heated, processed by melt extrusion, filamentized, woven, braided, and bag-making processes to produce the outer bag.

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