Adhesive cement for PVC / PVG (polyvinyl chloride / polyvinyl chloride) whole-core flame-retardant conveyor belt joint as well as preparation method and application of adhesive cement

Abstract

The invention discloses adhesive cement for a PVC / PVG whole-core flame-retardant conveying belt joint as well as a preparation method and application of the adhesive cement, and belongs to the technical field of new materials. The adhesive cement is prepared from the following components in parts by weight: 60 to 80 parts of polyvinyl chloride paste resin, 20 to 40 parts of vinyl chloride-vinyl acetate copolymer paste resin, 50 to 70 parts of phosphate ester substances, 10 to 20 parts of polyester plasticizer, 5 to 10 parts of epoxidized soybean oil, 3 to 5 parts of organic tin stabilizer, 2 to 3 parts of hexamethoxymethyl melamine, 10 to 20 parts of bio-based modified bonding resin and 2 to 4 parts of anti-fatigue agent. The invention provides the adhesive cement which can be used for constructing and manufacturing the joint under the conditions of short time, low temperature and low pressure, and the adhesive cement has better fatigue resistance and lower cost.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of new materials, and particularly relates to a PVC / PVG whole-core flame-retardant conveyor belt joint adhesive paste and a preparation method and application thereof. BACKGROUND

[0002] In the coal mining industry, PVC (polyvinyl chloride) / PVG whole-core flame-retardant conveyor belts, as important transportation equipment, are widely used in the mining, transportation and processing of coal. In order to ensure that the conveyor belt can stably and efficiently run during use, the quality of the joint technology directly affects the overall performance and safety of the conveyor belt. The joint of the PVC / PVG whole-core flame-retardant conveyor belt is usually bonded using a special adhesive paste to ensure the strength and durability of the connected part.

[0003] The joint of the whole-core conveyor belt generally uses a vulcanization joint method, that is, the two ends of the conveyor belt are cut into a finger-shaped structure according to the joint process requirements, then the surface covering adhesive is removed and polishing, adhesive paste coating and mesh cloth covering are performed, and finally a line covering adhesive is attached for vulcanization. Among them, the adhesive paste plays a role in firmly bonding the joint parts of the two ends of the conveyor belt to ensure the continuity and stability of the conveyor belt during operation.

[0004] Although the existing PVC / PVG whole-core conveyor belt joint adhesive paste has corresponding technical effects in some aspects, it still has certain deficiencies in fatigue resistance. The conveyor belt will experience frequent vibration and oscillation, especially in the case of high-strength operation or high-speed operation, due to the influence of large dynamic load, at this time the joint part will be subjected to repeated tensile, compressive, bending, shear and other stress actions in different directions. The adhesive paste at the joint needs to withstand these complex stress actions, and in a long period of use, the joint fatigue resistance is easily affected. SUMMARY

[0005] In order to overcome the defects of the prior art, the application provides a PVC / PVG whole-core flame-retardant conveyor belt joint adhesive paste and a preparation method and application thereof. The application focuses on developing an adhesive paste that can be used for joint construction and production under short-time, low-temperature and low-pressure conditions, and has good fatigue resistance.

[0006] The application provides a PVC / PVG whole-core flame-retardant conveyor belt joint adhesive paste, which comprises the following components in parts by weight:

[0007] 60-80 parts of polyvinyl chloride paste resin, 20-40 parts of vinyl chloride-vinyl acetate copolymer paste resin, 50-70 parts of phosphate ester, 10-20 parts of polyester plasticizer, 5-10 parts of epoxy soybean oil, 3-5 parts of organic tin stabilizer, 2-3 parts of hexamethoxymethyl melamine, 10-20 parts of bio-based modified adhesive resin and 2-4 parts of anti-fatigue agent.

[0008] In some embodiments, the polyvinyl chloride paste resin has an average polymerization degree of 1200-1400 and a B-type viscosity of 2000-6000 mPa.s at 30℃.

[0009] In some embodiments, the vinyl chloride-vinyl acetate copolymer paste resin has an average polymerization degree of 900-1100 and a B-type viscosity of 1500-4000 mPa.s at 30℃.

[0010] In some embodiments, the phosphate ester is a triaryl phosphate ester and / or a trihaloalkyl phosphate ester.

[0011] In some embodiments, the polyester plasticizer has a viscosity of 2700-3500 cPS at 25℃; and the epoxy soybean oil has an epoxy value greater than 6.

[0012] In some embodiments, the organotin heat stabilizer is a mercaptomethyl tin.

[0013] In some embodiments, the paste further comprises black paste 4-6 parts.

[0014] In some embodiments, the paste does not comprise a powder flame retardant.

[0015] The present application provides a preparation method of the PVC / PVG whole-core flame-retardant conveyor belt joint paste, comprising:

[0016] According to the weight ratio, polyvinyl chloride paste resin, vinyl chloride-vinyl acetate copolymer paste resin, phosphate ester, polyester plasticizer, epoxy soybean oil, organotin stabilizer, hexamethoxymethyl melamine, bio-based modified adhesive resin and anti-fatigue agent are weighed and mixed to obtain the paste.

[0017] Furthermore, the present application provides the use of the paste as described above in vulcanization to prepare a PVC / PVG whole-core flame-retardant conveyor belt joint.

[0018] At present, the formula and composition of the existing PVC / PVG whole-core flame-retardant conveyor belt joint paste in China are mostly in a confidential state, and there is a certain technical monopoly in the application process, which needs to be improved and optimized to realize the production of domestic products. In addition, the procurement cost of the existing paste on the market is high, which increases the manufacturing cost of the whole conveyor belt joint. This makes coal mining enterprises need to bear additional economic pressure in the application process, especially when it is used on a large scale, the cost problem is more prominent.

[0019] The present application provides a paste which can be used for bonding PVC / PVG whole core flame-retardant conveying belt joint, which takes polyvinyl chloride paste resin and vinyl chloride-vinyl acetate copolymer paste resin as main material components in a certain proportion, and cooperates with plasticizing system, heat stabilizer, adhesive and other additive components. In the present application, ethylene-vinyl acetate copolymer paste resin is mainly blended, which is beneficial to the paste to meet the construction and production of joint under the conditions of short time, low temperature and low pressure, and can improve the impact resistance of the joint. In the present application, phosphate ester can be the main plasticizer, polyester plasticizer and epoxy soybean oil are auxiliary plasticizers; the plasticizing system is used with organic tin heat stabilizer, which can achieve significant synergistic effect and improve the fatigue resistance of the joint. Therefore, the paste developed in the present application has good fatigue resistance for the vulcanized joint constructed and produced under the conditions of short time, low temperature and low pressure. In addition, the present application can also reduce the cost and is beneficial to application. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0021] The present application provides a paste for PVC / PVG whole core flame-retardant conveying belt joint, which comprises the following components in parts by weight:

[0022] Polyvinyl chloride paste resin 60-80 parts, vinyl chloride-vinyl acetate copolymer paste resin 20-40 parts, phosphate ester 50-70 parts, polyester plasticizer 10-20 parts, epoxy soybean oil 5-10 parts, organic tin stabilizer 3-5 parts, hexamethoxymethyl melamine 2-3 parts, bio-based modified adhesive resin 10-20 parts and anti-fatigue agent 2-4 parts.

[0023] The paste provided by the present application can be used for construction and production of joint under the conditions of short time, low temperature and low pressure, has good fatigue resistance and low cost.

[0024] In the specific embodiments of the present application, the main material of the paste is selected from polyvinyl chloride paste resin and vinyl chloride-vinyl acetate copolymer paste resin. That is, the paste comprises 60-80 parts by weight of polyvinyl chloride paste resin and 20-40 parts by weight of vinyl chloride-vinyl acetate copolymer paste resin.

[0025] The polyvinyl chloride paste resin is generally in a paste form of polyvinyl chloride (PVC) plastic, with a particle size range of 0.1-2.0 μm, easy to be pasted and convenient to process. The average polymerization degree of the polyvinyl chloride paste resin is 1200-1400, mainly 1300±100; and the B-type viscosity thereof at 30°C is 2000-6000 mPa.s (tested by a B-type viscometer). For example, the weight parts of the polyvinyl chloride paste resin can be 60 parts, 73 parts, 75 parts, 80 parts, etc.

[0026] The polyvinyl chloride paste resin is generally in a paste form of polyvinyl chloride (PVC) plastic, with a particle size range of 0.1-2.0 μm, easy to be pasted and convenient to process. The average polymerization degree of the polyvinyl chloride paste resin is 1200-1400, mainly 1300±100; and the B-type viscosity thereof at 30°C is 2000-6000 mPa.s (tested by a B-type viscometer). For example, the weight parts of the polyvinyl chloride paste resin can be 60 parts, 73 parts, 75 parts, 80 parts, etc.

[0027] For the selection of the plasticizing component system, the cement formulation of the specific embodiments of the present application includes: 50-70 parts of phosphate ester, 10-20 parts of polyester plasticizer, and 5-10 parts of epoxy soybean oil. The phosphate ester mainly plays a plasticizing role. As the main plasticizer, the phosphate ester has good heat resistance and chemical resistance, exhibits excellent flame retardancy, and has higher durability than traditional plasticizers. Meanwhile, when it is used as the main plasticizer, no powder flame retardant such as antimony trioxide, zinc borate, and aluminum hydroxide is used in the cement, so as to reduce the stress concentration phenomenon caused by the powder flame retardant, and further improve the fatigue resistance of the joint applied.

[0028] In some preferred embodiments, the phosphate ester is triaryl phosphate and / or trihaloalkyl phosphate, and further can be triaryl phosphate and trichloroethyl phosphate.

[0029] In the specific embodiments of the present application, the polyester plasticizer is used as an auxiliary plasticizer with epoxy soybean oil. Compared with traditional plasticizers, the polyester plasticizer has more polar groups and a larger molecular weight, and has the characteristics of low volatility, oil resistance, solvent extraction resistance, and migration resistance. It can be combined with low molecular weight plasticizers to ultimately give the joint long-term stability. Epoxy soybean oil has good compatibility with PVC resin, low volatility, small migration, excellent thermal stability and light stability, good water resistance and oil resistance, and can reduce the migration of plasticizers when used with other plasticizers in the paste. It has a significant synergistic effect when used with organic tin heat stabilizers.

[0030] Further, the polyester plasticizer is preferably a polyester of adipic acid; its viscosity at 25°C is 2700-3500 cPS; and the epoxy soybean oil has an epoxy value greater than 6, for example, 7-9.

[0031] The paste according to the specific embodiments of the present application comprises 3-5 parts of an organic tin stabilizer. In some embodiments, the organic tin heat stabilizer is preferably thiol methyl tin.

[0032] The embodiments of the present application also specifically select the addition of 2-3 parts of hexamethoxymethyl melamine and 10-20 parts of a bio-based modified adhesive resin. The bio-based modified adhesive resin can be Altertack Eco 11-A from Shanghai Changyue Chemical Co., Ltd., and the main component is lignin, with ash content ≤7.0%, bulk density 0.4-0.5 g / cm 3 In the industry, resorcinol is usually used as a methylene acceptor adhesive, but resorcinol can irritate the skin and mucous membranes, and can be rapidly absorbed through the skin to cause poisoning symptoms. At the same time, resorcinol needs to be ground before being used to prepare the paste, which increases the production cost. In addition to hexamethoxymethyl melamine, the embodiments of the present application select a bio-based modified adhesive resin to enhance adhesion, and its advantages include being green and environmentally friendly, and the raw material is abundant.

[0033] In addition, the paste specifically comprises an anti-fatigue agent (also known as a fatigue-resistant agent), as well as color paste and other additives. In some embodiments, the anti-fatigue agent is preferably 2-4 parts; it can be PL-600 fatigue-resistant agent from Taizhou Huangyan Donghai Chemical Co., Ltd., which is a complex composed of methyl tannin imidazole, activated phenolic resin, and m-m-b adhesive system, with a heating loss of ≤4.5% at 60°C / 1h. Preferably, the paste also comprises 4-6 parts of black paste, which can be HJ6-08 from Hengyang Lihui Environmental Protection New Materials Co., Ltd., and is mainly composed of a mixture of pigment carbon black and dioctyl terephthalate, with a fineness of ≤15 μm.

[0034] Correspondingly, the present application provides a preparation method of the paste for the PVC / PVG whole-core flame-retardant conveyor belt joint, comprising:

[0035] The polyvinyl chloride paste resin, vinyl chloride-vinyl acetate copolymer paste resin, phosphate ester, polyester plasticizer, epoxy soybean oil, organic tin stabilizer, hexamethoxymethyl melamine, bio-based modified adhesive resin and anti-fatigue agent are weighed according to the proportion by weight, stirred and mixed to obtain the paste.

[0036] The embodiment of the present application uses raw materials such as vinyl chloride-vinyl acetate copolymer paste resin, polyester plasticizer, phosphate ester, bio-based modified adhesive resin, and designs a PVC / PVG whole-core flame-retardant conveyor belt joint paste for coal mines and a preparation method thereof.

[0037] In some embodiments, the preparation method of the paste uses a conventional stirring and mixing device, and the specific steps can be:

[0038] Step one: the phosphate ester, polyester plasticizer, epoxy soybean oil, organic tin stabilizer and black paste are put into a dispersion stirrer and stirred for 1-5 min;

[0039] Step two: the vinyl chloride-vinyl acetate copolymer paste resin and 1 / 2 of the polyvinyl chloride paste resin are put into the dispersion stirrer and stirred for 3-10 min;

[0040] Step three: the dispersion disc is raised to scrape the wall, and then the bio-based modified adhesive resin and the remaining 1 / 2 of the polyvinyl chloride paste resin are put into the dispersion stirrer and stirred for 3-10 min;

[0041] Step four: the dispersion disc is raised to scrape the wall, and then the hexamethoxymethyl melamine and the anti-fatigue agent are put into the dispersion stirrer and stirred for 3-10 min, and the dispersion disc is raised to scrape the wall;

[0042] Step five: the vacuum is started, and the stirring is performed for 30-60 min.

[0043] The embodiment of the present application does not have special restrictions on the adding order and mixing and stirring mode of each raw material component, and is preferably prepared according to the above steps; the paste is still soft after solidification. In some embodiments, the viscosity of the paste can be 5000-9000 cPS / 25℃ (for example, 6000-7000 cPS); and the fineness is ≤50 μm.

[0044] Furthermore, the embodiment of the present application provides the application of the paste as described above in the vulcanization preparation of a PVC / PVG whole-core flame-retardant conveyor belt joint.

[0045] Most of the pastes on the market at present need a longer vulcanization time, a higher vulcanization temperature and a higher vulcanization pressure, which increases the time cost and energy consumption cost of construction. However, some customers require short time, low temperature and low pressure when making joints, for example, in Australia, the time, temperature and pressure of the vulcanization machine set when making joints in the coal mine are much lower than those in China.

[0046] In some specific embodiments of the present application, a 1800S*1600mm (2+2) PVG whole core conveyor belt (the longitudinal tensile strength of the conveyor belt is 1800N / mm, the width of the conveyor belt is 1600mm, and the thickness of the upper and lower cover rubber of the conveyor belt is 2mm) is prepared by using the above-mentioned cement under the vulcanization conditions of 150-160℃ / 0.7-1.8MPa / 20-23min to form a PVC / PVG whole core flame-retardant conveyor belt joint sample. After durability test, the adhesion strength of the joint is maintained well.

[0047] In order to better understand the technical content of the present application, the following specific examples are provided to further illustrate the present application. Among them, each raw material is commercially available. The polyvinyl chloride paste resin is LF-51L of Langhui Petrochemical Co., Ltd., with an average polymerization degree of 1300±100; the vinyl chloride-vinyl acetate copolymer paste resin is PCMA-12 of Shenyang Chemical Co., Ltd., with an average polymerization degree of 1000±100. The polyester plasticizer is adipic acid polyester (UN620 of Liancheng Chemical Technology Co., Ltd.), with a viscosity of 2700~3500cPS / 25℃; the epoxy soybean oil is ESO-KLO1 of Zibo KaiLian Chemical Co., Ltd., with an epoxy value of ≥6.1%. The organic tin stabilizer is thiol methyl tin, thiol methyl tin heat stabilizer JX-181 of Taian Blue Sky Additives Co., Ltd., with a tin content of 19±0.5% and a sulfur content of 12±0.5%; the bio-based modified adhesive resin is Altertack Eco 11-A of Shanghai Changyu Chemical Co., Ltd.; the fatigue resistant agent is PL-600 of Taizhou Huangyan Donghai Chemical Co., Ltd.; and the black paste is HJ6-08 of Hengyang Lihui Environmental Protection New Material Co., Ltd.

[0048] Example 1

[0049] The proportion of the cement formula is calculated by weight parts:

[0050] Polyvinyl chloride paste resin 80 parts, vinyl chloride-vinyl acetate copolymer paste resin 20 parts, triaryl phosphate (triisopropyl phenyl phosphate, the same below) 30 parts, trichloroethyl phosphate 10 parts, polyester plasticizer 20 parts, epoxy soybean oil 10 parts, organic tin stabilizer 3 parts, hexamethoxymethyl melamine 3 parts, bio-based modified adhesive resin 20 parts, anti-fatigue agent 2 parts, and black paste 6 parts.

[0051] The preparation method of the PVC / PVG whole core flame-retardant conveyor belt joint cement comprises the following specific steps:

[0052] Step one: put the phosphate ester, polyester plasticizer, epoxy soybean oil, organic tin stabilizer and black paste into a dispersion mixer and stir for 2min;

[0053] Step two: Put the vinyl chloride-vinyl acetate copolymer paste resin and 1 / 2 of the polyvinyl chloride paste resin into the dispersion stirrer and stir for 5 min;

[0054] Step three: Raise the dispersion disc to scrape the wall, then put the bio-based modified adhesive resin and the remaining 1 / 2 of the polyvinyl chloride paste resin into the dispersion stirrer and stir for 5 min;

[0055] Step four: Raise the dispersion disc to scrape the wall, put the hexamethoxymethyl melamine and the anti-fatigue agent into the dispersion stirrer and stir for 5 min, and raise the dispersion disc to scrape the wall;

[0056] Step five: Turn on the vacuum and stir for 40 min to obtain the cement paste; the viscosity is 5000-9000 cPS / 25℃, and the fineness is ≤50μm.

[0057] Note: The temperature in the stirring kettle in all the above steps is controlled below 40℃; the dispersion stirrer is a concentric double-shaft structure frame stirring paddle (the same below).

[0058] Take 1800S*1600mm (2+2) PVG whole core belt, use the joint cement paste in Example 1, prepare joint samples under the vulcanization conditions of 150℃ / 0.7MPa / 20min, and conduct the following durability test (the test conditions are referred to the industry standard MT / T318).

[0059] ① Joint dynamic durability test: conduct joint dynamic durability strengthening test on the double-roller dynamic fatigue test bench; the test result is that the joint is intact and not disconnected when the tension fluctuation cycle number is greater than 40000 times.

[0060] ② Joint dynamic durability test before and after the sample covering adhesive test: from the test result, it can be known that the covering adhesive strength at the joint has no obvious attenuation.

[0061] Table 1 Test results of Example 1

[0062]

[0063] Example 2

[0064] The cement paste formula ratio is calculated by weight parts:

[0065] Polyvinyl chloride paste resin 75 parts, vinyl chloride-vinyl acetate copolymer paste resin 25 parts, triaryl phosphate ester 30 parts, trichloroethyl phosphate ester 15 parts, polyester plasticizer 17 parts, epoxy soybean oil 8 parts, organic tin stabilizer 4 parts, hexamethoxymethyl melamine 2.5 parts, bio-based modified adhesive resin 17 parts, anti-fatigue agent 3 parts, and black paste 5 parts.

[0066] The preparation method of the coal mine PVC / PVG whole core flame-retardant conveyor belt joint cement paste, the specific steps are:

[0067] Step one: Put phosphate ester, polyester plasticizer, epoxy soybean oil, organic tin stabilizer, black paste into the dispersion mixer, stir for 2 min;

[0068] Step two: Put vinyl chloride-vinyl acetate copolymer paste resin and 1 / 2 of the polyvinyl chloride paste resin into the dispersion mixer, stir for 5 min;

[0069] Step three: Raise the dispersion disc to scrape the wall, then put the bio-based modified adhesive resin and the remaining 1 / 2 of the polyvinyl chloride paste resin into the dispersion mixer, stir for 5 min;

[0070] Step four: Raise the dispersion disc to scrape the wall, put hexamethoxymethyl melamine and anti-fatigue agent into the dispersion mixer, stir for 5 min, and raise the dispersion disc to scrape the wall;

[0071] Step five: Turn on the vacuum, stir for 40 min, and get the paste.

[0072] Note: The temperature in the stirring kettle in all the above steps is controlled below 40℃.

[0073] Take 1800S*1600mm (2+2) PVG whole core belt using the joint paste in Example 1, prepare joint samples under the vulcanization conditions of 150℃ / 0.7MPa / 20min, and conduct the following durability tests:

[0074] ① Joint dynamic durability test: Conduct joint dynamic durability strengthening test on the double drum dynamic fatigue test bench, and the test result is that the joint is intact and not disconnected when the tension fluctuation cycle number is greater than 40000.

[0075] ② Sample covering adhesive bonding test before and after joint dynamic durability test; from the test result, it can be seen that the covering adhesive bonding strength at the joint has no obvious attenuation.

[0076] Table 2 Test results of Example 2

[0077]

[0078] Example 3

[0079] The paste formula ratio is by weight:

[0080] Polyvinyl chloride paste resin 70 parts, vinyl chloride-vinyl acetate copolymer paste resin 30 parts, triaryl phosphate ester 30 parts, trichloroethyl phosphate ester 20 parts, polyester plasticizer 15 parts, epoxy soybean oil 5 parts, organic tin stabilizer 5 parts, hexamethoxymethyl melamine 2 parts, bio-based modified adhesive resin 14 parts, anti-fatigue agent 4 parts, black paste 4 parts.

[0081] The preparation method of the coal mine PVC / PVG whole core flame-retardant conveying belt joint paste comprises the following specific steps:

[0082] Step one: put phosphate ester, polyester plasticizer, epoxy soybean oil, organic tin stabilizer and black paste into a dispersion stirrer and stir for 2 minutes;

[0083] Step two: put vinyl chloride-vinyl acetate copolymer paste resin and 1 / 2 polyvinyl chloride paste resin into the dispersion stirrer and stir for 5 minutes;

[0084] Step three: raise the dispersion disc to scrape the wall, then put bio-based modified adhesive resin and the remaining 1 / 2 polyvinyl chloride paste resin into the dispersion stirrer and stir for 5 minutes;

[0085] Step four: raise the dispersion disc to scrape the wall, then put hexamethoxymethyl melamine and anti-fatigue agent into the dispersion stirrer and stir for 5 minutes, and raise the dispersion disc to scrape the wall;

[0086] Step five: start vacuumizing and stir for 40 minutes to obtain the paste.

[0087] Note: the temperature in the stirring kettle in all the above steps is controlled below 40 DEG C.

[0088] Take 1800S*1600mm (2+2) PVG whole core belt, use the joint paste in Example 1, and prepare joint samples under the vulcanization conditions of 150 DEG C / 0.7 MPa / 20 min to conduct the following durability tests.

[0089] ① Joint dynamic durability test: conduct joint dynamic durability strengthening test on a double drum dynamic fatigue test bench, and the test result is that the joint is intact and not disconnected when the tension fluctuation cycle number is greater than 40,000.

[0090] ② Sample covering adhesive bonding test before and after the joint dynamic durability test; from the test result, it can be known that the covering adhesive bonding strength at the joint has no obvious attenuation.

[0091] Table 3 test results of Example 3

[0092]

[0093] Example 4

[0094] Take 1800S*1600mm (2+2) PVG whole core belt, use the joint paste in Example 1, and prepare joint samples under the vulcanization conditions of 160 DEG C / 1.8 MPa / 23 min to conduct the following durability tests.

[0095] ①Joint dynamic durability test: The joint dynamic durability test was carried out on the double-roller dynamic fatigue test bench, and the test results showed that the joint was intact and not disconnected when the tension fluctuation cycle number was greater than 40,000 times.

[0096] ②Sample covering adhesive test before and after joint dynamic durability test: From the test results, it can be seen that the covering adhesive strength at the joint has no obvious attenuation.

[0097] Table 4 Test results of Example 4

[0098]

[0099] From the test results of Example 1 and Example 4, it can be seen that the durability of the vulcanized joints made using the glue paste in the present application under low temperature, short time, low pressure and high temperature, long time, high pressure conditions is at the same level.

[0100] Comparative Example 1

[0101] Take 1800S*1600mm (2+2) PVG whole core belt, use the joint glue paste purchased on the market (viscosity 5000~9000cPS / 25℃, fineness≤50μm), prepare joint samples under the vulcanization conditions of 160℃ / 1.8MPa / 23min, and carry out the following durability tests:

[0102] ①Joint dynamic durability test: The joint dynamic durability test was carried out on the double-roller dynamic fatigue test bench, and the test results showed that the joint was intact and not disconnected when the tension fluctuation cycle number was greater than 40,000 times.

[0103] ②Sample covering adhesive test before and after joint dynamic durability test: From the test results, it can be seen that the covering adhesive strength at the joint has no obvious attenuation.

[0104] Table 5 Test results of Comparative Example 1

[0105]

[0106] From the test results of Example 4 and Comparative Example 1, it can be seen that the durability of the vulcanized joints prepared using the glue paste in the present application and the glue paste purchased on the market under high temperature, long time, high pressure conditions is at the same level.

[0107] Comparative Example 2

[0108] Take 1800S*1600mm (2+2) PVG whole core belt, use the joint glue paste purchased on the market (the glue paste of Comparative Example 1), prepare joint samples under the vulcanization conditions of 150℃ / 0.7MPa / 20min, and carry out the following durability tests:

[0109] ①Joint dynamic durability test: joint dynamic durability strengthening test is carried out on a double roller dynamic fatigue test bench, and the test result is that the joint is disconnected when the tension fluctuation cycle number is 12032.

[0110] ②Sample adhesive test before and after joint dynamic durability test.

[0111] Table 6 test results of comparative example 2

[0112]

[0113] From the test results of example 1 and comparative example 2, it can be seen that the durability of the vulcanized joint prepared by using the glue slurry in the application under low temperature, short time and low pressure conditions is obviously better than that of the vulcanized joint prepared by using the market purchased glue slurry.

[0114] From the above examples, it can be seen that the glue slurry provided by the examples of the application has good fatigue resistance for the vulcanized joint prepared under short time, low temperature and low pressure conditions. In addition, the application can also reduce the cost and is beneficial to application.

[0115] The principles and implementation modes of the application are described by using specific examples in this paper, and the above examples are only used to help understand the method of the application and its core idea. The above description is only the preferred embodiment of the application, and it should be pointed out that due to the limitation of language expression, there are infinite specific structures, and for ordinary skilled persons in the technical field, some improvements, decorations or changes can be made without departing from the principles of the application, and the above technical features can be combined in a proper way; these improvements, decorations, changes or combinations, or the application of the concept and technical scheme of the application to other occasions without improvement, shall be regarded as the protection scope of the application.

Claims

1. A type of adhesive for splicing PVC / PVG solid woven flame-retardant conveyor belts, characterized in that, Based on parts by weight, it includes the following components: The mixture contains 60-80 parts of polyvinyl chloride paste resin, 20-40 parts of vinyl chloride-vinyl acetate copolymer paste resin, 50-70 parts of phosphate esters, 10-20 parts of polyester plasticizer, 5-10 parts of epoxidized soybean oil, 3-5 parts of organotin stabilizer, 2-3 parts of hexamethoxymethyl melamine, 10-20 parts of bio-based modified adhesive resin, and 2-4 parts of anti-fatigue agent.

2. The adhesive for splicing PVC / PVG solid woven flame-retardant conveyor belts according to claim 1, characterized in that, The polyvinyl chloride paste resin has an average degree of polymerization of 1200~1400 and a type B viscosity of 2000~6000 mPa·s at 30°C.

3. The adhesive for splicing PVC / PVG solid woven flame-retardant conveyor belts according to claim 1, characterized in that, The average degree of polymerization of the vinyl chloride-vinyl acetate copolymer paste resin is 900~1100, and the viscosity of type B at 30°C is 1500~4000 mPa·s.

4. The adhesive for splicing PVC / PVG solid woven flame-retardant conveyor belts according to any one of claims 1-3, characterized in that, The phosphate esters are triaryl phosphate esters and / or trihaloalkyl phosphate esters.

5. The adhesive for splicing PVC / PVG solid woven flame-retardant conveyor belts according to claim 4, characterized in that, The viscosity of the polyester plasticizer at 25°C is 2700~3500 cPS; the epoxy value of the epoxidized soybean oil is greater than 6.

6. The adhesive for splicing PVC / PVG solid woven flame-retardant conveyor belts according to any one of claims 1-3, characterized in that, The organotin heat stabilizer is thiol methyltin.

7. The adhesive for splicing PVC / PVG solid woven flame-retardant conveyor belts according to any one of claims 1-3, characterized in that, The adhesive also includes 4 to 6 parts of black paste.

8. The adhesive for splicing PVC / PVG solid woven flame-retardant conveyor belts according to any one of claims 1-3, characterized in that, The adhesive does not include powder flame retardants.

9. A method for preparing the adhesive for splicing PVC / PVG solid woven flame-retardant conveyor belts according to any one of claims 1-8, characterized in that, include: Weigh out the following components by weight: polyvinyl chloride paste resin, vinyl chloride-vinyl acetate copolymer paste resin, phosphate esters, polyester plasticizer, epoxidized soybean oil, organotin stabilizer, hexamethoxymethyl melamine, bio-based modified adhesive resin, and anti-fatigue agent. Mix them together to obtain the adhesive paste.

10. The application of the adhesive as described in any one of claims 1-8 in the vulcanization preparation of PVC / PVG solid woven flame-retardant conveyor belt joints.

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