Support layer cut edge variable speed farm machine belt and method of making same

Abstract

The application relates to the technical field of rubber belts, and discloses a support layer edge-cut variable-speed agricultural machine belt and a preparation method thereof. The agricultural machine belt comprises a bottom rubber layer, a transverse support layer located on the bottom rubber layer, a framework layer located on a toughened brown silk composite layer, and a top cloth layer located on the framework layer. Nylon short fibers are contained in the bottom rubber layer. The transverse support layer comprises transversely-woven toughened brown silk. The framework layer comprises a radial framework. The combination of the nylon fiber bottom rubber, the transversely-arranged toughened brown silk and the radial framework enables the agricultural machine belt to have the technical effects of high transverse support anti-flexibility and high longitudinal flexibility, and significantly improves the fatigue life of the agricultural machine belt. The agricultural machine belt has low manufacturing cost, small processing difficulty during use, significantly improved service life and significantly improved application value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rubber belts, in particular to a support layer cut edge variable speed agricultural machine belt and a preparation method thereof. BACKGROUND

[0002] The variable speed agricultural machine belt is a mechanical component applied in agricultural machinery. Since the power is large and the load is heavy during the operation of the agricultural machinery, the structural strength of the agricultural machine belt needs to meet the use requirements of the agricultural machinery. In the prior art, aramid fibers are added to the bottom glue of the agricultural machine belt to enhance the structural strength of the agricultural machine belt. For example, a cut edge type EPDM light agricultural machine belt and a processing method thereof are disclosed in the publication CN110483903A. The technical solution adds aramid fibers to the rubber compound to increase the flex fatigue resistance and structural strength of the agricultural machine belt. For another example, a full chlorobutyl cloth agricultural V belt is disclosed in the publication CN209324931U. The technical solution uses aramid fiber ropes as the framework layer of the agricultural machine belt to solve the problems of poor flex resistance and high heat generation of the cloth belt.

[0003] However, it is found in actual operation that although the addition of aramid fibers in the agricultural machine belt can improve the strength of the agricultural machine belt, the cost of the agricultural machine belt is high due to the high price of aramid fibers. When the content of aramid fibers is too high, the longitudinal flexibility of the agricultural machine belt is reduced, causing the agricultural machine belt to be easily broken in the reverse direction. In addition, the cutting processing of aramid fibers is difficult, and the cutting processing of the cut edge agricultural machine belt after molding by a mold is time-consuming and labor-intensive, and the processing efficiency is very low. Usually, professional tools are needed for processing, and the cut edge agricultural machine belt cannot be processed and ground by itself during actual use in the agricultural machinery. SUMMARY

[0004] In order to overcome the problems of high cost, poor longitudinal flexibility and high processing difficulty of the cut edge agricultural machine belt in the prior art, the present application provides a support layer cut edge variable speed agricultural machine belt and a preparation method thereof. The agricultural machine belt comprises a bottom glue layer, a transverse support layer, a framework layer and a top cloth layer. The fiber added in the bottom glue layer in the scheme is nylon fiber, the transverse support layer is provided with transversely arranged tempered brown silk, and the framework layer uses a wire rope as a radial framework. The present application combines the nylon fiber bottom glue, the transversely arranged tempered brown silk and the radial framework to make the agricultural machine belt have high transverse support and flex resistance and high longitudinal flexibility. In addition, the agricultural machine belt of the present application has low manufacturing cost, low processing difficulty during use and significantly improved service life.

[0005] The specific technical scheme of the present application is as follows:

[0006] The application discloses a support layer cut-edge variable-speed agricultural machine belt, which comprises a bottom rubber layer 1, a transverse support layer 2 on the bottom rubber layer, a framework layer 3 on a toughened brown silk composite layer and a top cloth layer 4 on the framework layer.

[0007] The application provides a support layer cut-edge variable-speed agricultural machine belt, which is composed of a bottom rubber layer, a transverse support layer, a framework layer and a top cloth layer, and the bottom rubber layer contains nylon fibers, the structure strength of the bottom rubber layer is increased through the nylon fibers, the transverse support layer contains transversely woven toughened brown silk, the anti-bending performance of the agricultural machine belt is improved through the transversely woven toughened brown silk, and the framework layer is provided with radial frameworks, and the radial structure strength of the agricultural machine belt is improved.

[0008] Preferably, the raw materials of the bottom rubber layer include chlorobutyl rubber 3222 100 parts, stearic acid 1-1.4 parts, nano zinc oxide 6-7 parts, magnesium oxide 3-5 parts, anti-aging agent ODA 1-2 parts, anti-aging agent 4010NA 1-1.5 parts, 90 resin 1-2.5 parts, N330 50-60 parts, nylon short fibers 20-30 parts and dibutyl ester 1-2 parts, accelerator DM 0.2-0.5 parts, and other 10 parts.

[0009] Preferably, the transverse support layer further comprises a rubberizing layer combined with the transversely woven toughened brown silk.

[0010] Preferably, the rubberizing layer is a mianmian white adhesive system.

[0011] As preferred, the raw materials of the methylene white adhesive system include, by mass fraction: chlorobutyl glue 3222 80 parts, standard glue 20 parts, stearic acid 1 part, nano zinc oxide 5 parts, antioxidant ODA 2 parts, antioxidant 4010NA 2 parts, coumarone 2.5 parts, N550 40-45 parts, N660 20-25 parts, white carbon black 13 parts, dibutyl ester 2 parts, sulfur 0.8 parts, DTDM 1.5-2 parts, adhesive RC 7-8 parts, and other 5 parts.

[0012] As preferred, the diameter of the tempered brown wire is 1-1.4 mm, and the spacing of the tempered brown wire is 2-2.5 mm.

[0013] As preferred, the skeleton layer further includes buffer glue compounded with the radial skeleton,

[0014] As preferred, the radial skeleton cord is high-modulus low-shrinkage 6x5 polyester hard cord.

[0015] As preferred, the top cloth layer includes top cloth 401 and top glue compounded with the top.

[0016] A preparation method of the support layer cut-edge variable speed agricultural machine belt, comprising the following steps:

[0017] Step 1: preparing buffer glue;

[0018] Step 2: preparing top glue;

[0019] Step 3: preparing the adhesive according to the methylene white system;

[0020] Step 4: preparing the bottom glue according to the raw materials of the bottom glue;

[0021] Step 5: activating the tempered brown wire using a tempered brown wire activator, then transversely weaving the tempered brown wire cloth, and then coating and pressing the adhesive prepared in step 3 into the tempered brown wire cloth to prepare the adhesive compounded tempered brown wire cloth;

[0022] Step 6: spraying the release agent to the surface of the mold, sequentially arranging the top cloth, the top glue, the buffer glue, the skeleton cord, the adhesive compounded tempered brown wire cloth, and the bottom glue in the mold, and then performing vulcanization, demolding, cutting, and grinding to obtain the support layer cut-edge variable speed agricultural machine belt blank;

[0023] Step 7: cutting and grinding the support layer cut-edge variable speed agricultural machine belt blank according to the required shape to obtain the support layer cut-edge variable speed agricultural machine belt.

[0024] As preferred, the tempered brown wire activator is a sulfide epoxy resin prepared by co-reaction of diglycidyl ether, epoxy resin, and dimercaptothiadiazole.

[0025] Preferably, the co-reaction step includes: reacting dimercaptothiadiazole with epoxy resin at 90 °C for 20-30 min, then adding diglycidyl ether and reacting exothermically to 120 °C and holding at that temperature for 2.5 h.

[0026] This invention also provides a method for preparing the above-mentioned support layer edge-cutting variable speed agricultural machinery belt. This method uses a tempered coir filament activator to treat the surface of the tempered coir filament, making the structure more stable after the tempered coir filament is combined with the adhesive layer. The tempered coir filament activator of this invention uses a sulfide epoxy resin, which can form a more stable vulcanization system with the m-methyl-2-ethyl adhesive system. The tempered coir filament activator of this invention is a sulfide epoxy resin formed by the co-reaction of dimercaptothiadiazole, epoxy resin, and diglycidyl ether. After being grafted onto the epoxy resin, the dimercaptothiadiazole will graft sulfur-containing groups into the epoxy resin. When used to treat the tempered coir filament, the tempered coir filament activator can form a sulfide epoxy resin film on the surface of the tempered coir filament. When this sulfide epoxy resin film is combined with the m-methyl-2-ethyl adhesive system and then vulcanized, it can form a tightly structured vulcanization system, significantly improving the bonding force between the tempered coir filament and the vulcanized rubber.

[0027] Compared with the prior art, this application has the following technical effects:

[0028] (1) The support layer tangential speed change agricultural belt of the present invention combines nylon fiber base rubber, transversely arranged tempered coir filaments and radial skeleton to make the agricultural belt have both high transverse support and high longitudinal flexibility, which significantly improves the service life of the agricultural belt.

[0029] (2) The support layer edge-cut variable speed agricultural machinery belt of the present invention has low manufacturing cost and low processing difficulty during use, which can solve the problem of high processing difficulty of aramid fiber agricultural machinery belt;

[0030] (3) The method for preparing the support layer edge-cutting variable speed agricultural machinery belt provided by the present invention uses a sulfide epoxy resin tempered brown fiber activator to activate the surface of the tempered brown fiber, so that the tempered brown fiber and the metamethyl white system adhesive form a tight vulcanization system, which significantly increases the bonding force between the tempered brown fiber and the rubber system. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0032] In the figure, there are base adhesive layer 1, transverse support layer 2, tempered coir filament 201, skeleton layer 3, radial skeleton 301, top fabric layer 4, and top fabric 401. Detailed Implementation

[0033] The present invention will be further described below with reference to embodiments.

[0034] Example 1: (2-layer toughened brown silk)

[0035] As shown in Figure 1 A support layer cut-edge variable speed agricultural belt includes a bottom glue layer 1, a transverse support layer 2 on the bottom glue layer, a framework layer 3 on the toughened brown silk composite layer, and a top cloth layer 4 on the framework layer. The bottom glue layer contains 66 nylon short fibers. The transverse support layer includes transversely woven toughened brown silk 201 and adhesive compounded with the transversely woven toughened brown silk. The diameter of the toughened brown silk is 1 mm. The toughened brown silk is a plurality of toughened brown silk polyester rods arranged in 2 layers in the transverse direction. The spacing of the toughened brown silk polyester rods is 2 mm. The adhesive is filled in the gap of the toughened brown silk and forms a coating on the toughened brown silk. The framework layer includes radial frameworks 301 arranged along the extension direction of the support layer cut-edge variable speed agricultural belt and buffer glue compounded with the radial frameworks. The buffer glue is filled in the gap of the radial frameworks and forms a coating on the radial frameworks. The radial framework cord is a high modulus low shrinkage 6x5 polyester hard cord. The top cloth layer includes top cloth 401 and top glue compounded with the top cloth. The top glue is immersed in the top cloth and bonds the top cloth to the framework layer. The cross-sectional shape of the agricultural belt is trapezoidal.

[0036] The raw materials of the bottom glue layer include, by mass fraction: 100 parts of neoprene 3222, 1.2 parts of stearic acid, 5 parts of nano zinc oxide, 4 parts of magnesium oxide, 2 parts of antioxidant ODA, 1.5 parts of antioxidant 4010NA, 2.5 parts of 90 resin, 55 parts of N330, 25 parts of nylon short fibers, 2 parts of dibutyl ester, and 0.2 parts of accelerator DM.

[0037] The adhesive is a m-cresol white adhesive system. The raw materials of the m-cresol white adhesive system include, by mass fraction: 80 parts of neoprene 3222, 20 parts of standard glue, 1 part of stearic acid, 5 parts of nano zinc oxide, 2 parts of antioxidant ODA, 2 parts of antioxidant 4010NA, 2.5 parts of coumarone, 40 parts of N550, 20 parts of N660, 13 parts of white carbon black, 2 parts of dibutyl ester, 0.8 parts of sulfur, 2 parts of DTDM, 7 parts of adhesive RC.

[0038] A method for preparing the above support layer cut-edge variable speed agricultural belt includes the following steps:

[0039] Step 1: prepare a buffer gum, the raw materials of the buffer gum include, by mass fraction: 80 parts of neoprene 3222, 20 parts of standard glue, 1 part of stearic acid, 5 parts of nano zinc oxide, 2 parts of antioxidant ODA, 2 parts of antioxidant 4010NA, 2.5 parts of coumarone, 40 parts of N550, 20 parts of N660, 13 parts of white carbon black, 2 parts of dibutyl ester, 0.8 parts of sulfur, 2 parts of DTDM, 7 parts of adhesive RC; first use a banbury mixer to prepare a mixed rubber, the banbury mixing adopts a two-stage method, the first stage is discharged at a temperature of 105 DEG C, the sheet is pressed and parked for 8 hours, the second stage is mixed by adding sulfur, zinc oxide, accelerator and adhesive, the sheet is pressed and cooled, and after inspection, the rubber sheet is obtained on a calender, the thickness is 0.36+ / -0.01 mm, the roughening roller temperature is 45+ / -5 DEG C; the upper roller temperature of the calender is 80 DEG C, the middle roller temperature is 65+ / -5 DEG C; the specified width is 505 mm, and the rubber sheet is collected on a cloth roll;

[0040] Step 2: prepare a top gum; the raw materials of the top gum layer include, by mass fraction: 100 parts of neoprene 3222, 1.2 parts of stearic acid, 5 parts of nano zinc oxide, 4 parts of magnesium oxide, 2 parts of antioxidant ODA, 1.5 parts of antioxidant 4010NA, 2.5 parts of 90 resin, 55 parts of N330, 25 parts of nylon short fibers, 2 parts of dibutyl ester, 0.2 parts of accelerator DM; first use a banbury mixer to prepare a mixed rubber, the banbury mixing adopts a two-stage method, the first stage is mixed by adding short fibers for 200 seconds, then add small materials and coarse materials, the discharge temperature is 115 DEG C, the sheet is pressed and parked until the rubber sheet temperature is lower than 40 DEG C, the second stage is mixed by adding zinc oxide, accelerator and adhesive, the sheet is pressed and cooled, and after inspection, the rubber sheet is obtained on a calender, the thickness is 0.6+ / -0.01 mm, the roughening roller temperature is 45+ / -5 DEG C; the upper roller temperature of the calender is 80 DEG C, the middle roller temperature is 55+ / -5 DEG C, the speed ratio of the calender is 1:1.25, the specified width is 1200 mm, and the rubber sheet is collected on a cloth roll, and then the rubber sheet is spliced into a fiber transverse arrangement rubber sheet on a transverse splicing machine, and the rubber sheet is collected on a roll;

[0041] Step 3: prepare a paste gum according to the raw materials of the m-t-b system, the raw materials of the paste gum include, by mass fraction: 80 parts of neoprene 3222, 20 parts of standard glue, 1 part of stearic acid, 5 parts of nano zinc oxide, 2 parts of antioxidant ODA, 2 parts of antioxidant 4010NA, 2.5 parts of coumarone, 40 parts of N550, 20 parts of N660, 13 parts of white carbon black, 2 parts of dibutyl ester, 0.8 parts of sulfur, 2 parts of DTDM, 7 parts of adhesive RC, and 5 parts of other materials; first use a banbury mixer to prepare a mixed rubber, the banbury mixing adopts a two-stage method, the first stage is discharged at a temperature of 105 DEG C, the sheet is pressed and parked for 8 hours, the second stage is mixed by adding sulfur, zinc oxide, accelerator and adhesive, the sheet is pressed and cooled, and after inspection, the rubber sheet is obtained on a calender, the thickness is 0.36+ / -0.01 mm, the roughening roller temperature is 45+ / -5 DEG C; the upper roller temperature of the calender is 80 DEG C, the middle roller temperature is 65+ / -5 DEG C; the specified width is 505 mm, and the rubber sheet is collected on a cloth roll;

[0042] Step 4: the primer is prepared according to the raw materials of the primer; the raw materials of the primer layer include, by mass fraction: 100 parts of neoprene 3222, 1.2 parts of stearic acid, 5 parts of nano zinc oxide, 4 parts of magnesium oxide, 2 parts of antioxidant ODA, 1.5 parts of antioxidant 4010NA, 2.5 parts of 90 resin, 55 parts of N330, 25 parts of nylon short fiber, 2 parts of dibutyl ester, and 0.2 parts of accelerator DM; first, use the internal mixer to make the rubber compound, and use two-stage mixing method, first mix the short fibers for 200 seconds, then add the small and large materials, and the discharge temperature is 115°C; after the rubber compound is cooled to a temperature lower than 40°C, the second mixing is carried out by adding zinc oxide, accelerator and adhesive; after the rubber compound is cooled and the test is qualified, the rubber compound is extruded on the calender to obtain a rubber sheet with a thickness of 0.6±0.01 mm; the roughening roller temperature is 45±5°C; the upper roller temperature of the calender is 80°C, the middle roller temperature is 55±5°C, the speed ratio of the calender is 1:1.25, the specified width is 1200 mm, and the rubber sheet is collected on the cloth; then the rubber sheet is cut into a fiber transverse arrangement rubber sheet on the cross-cut splicing machine, and the rubber sheet is collected on the cloth;

[0043] Step 5: the dithiobis-thiazoles and the epoxy resin are reacted at 90°C for 20-30 minutes, then the diglycidyl ether is added, and the reaction is exothermed to 120°C, and then the temperature is maintained for 2.5 hours to support the toughening brown silk activator; the toughening brown silk is immersed in the toughening brown silk activator for 1 hour, then the toughening brown silk is taken out and cured into a film at 60°C; the toughening brown silk is activated using the toughening brown silk activator, then the toughening brown silk is woven into a toughening brown silk cloth, and then the rubber coating prepared in step 3 is coated on the toughening brown silk cloth to obtain a rubber-coated toughening brown silk cloth;

[0044] Step 6: the release agent is sprayed on the surface of the mold, the top cloth is placed in the mold, the top rubber is placed on the top cloth and pressed to obtain a top rubber composite top cloth, the buffer rubber is placed on the top rubber composite top rubber, the string is wound on the buffer rubber with constant tension, a layer of buffer rubber is coated and pressed, two layers of rubber-coated toughening brown silk cloth are placed on the buffer rubber and pressed, and finally the primer sheet is attached to the process specified thickness, the mold is removed and vulcanized, demolded and cut to obtain a support layer cut edge variable speed agricultural belt blank; the rubber-coated toughening brown silk cloth is obtained by using a four-roll calender, the temperatures of the 1st and 4th rollers are 90°C, and the temperatures of the 2nd and 3rd rollers are 70°C; the thickness of the rubber after pressing is 1.3±0.1 mm, and the 2nd and 3rd rubber-coated rollers have cutters to ensure the neatness of the rubber edges; the vulcanization conditions include an external pressure of 1.0 KPa, an internal pressure of 0.4 KPa, a vulcanization time of 45 minutes, a thickness of 22.5 mm, and a cutting width of 50.8±0.2 mm;

[0045] Step 7: the support layer cut edge variable speed agricultural belt blank is ground according to the required shape to obtain a support layer cut edge variable speed agricultural belt, the length of the grinding is controlled in the effective length range of 2307±10 mm, and the grinding wheel angle is 28±1°.

[0046] Example 2: (1 layer toughened brown silk)

[0047] A support layer cut-edge variable speed agricultural belt comprises a bottom rubber layer 1, a transverse support layer 2 on the bottom rubber layer, a framework layer 3 on the toughened brown silk composite layer, and a top cloth layer 4 on the framework layer, the bottom rubber layer contains 66 nylon short fibers; the transverse support layer comprises transversely woven toughened brown silk 201 and adhesive paste compounded with the transversely woven toughened brown silk, the diameter of the toughened brown silk is 1.4 mm, the toughened brown silk is a plurality of toughened brown silk polyester rods arranged in one layer in the transverse direction, the spacing of the toughened brown silk polyester rods is 2.2 mm, the adhesive paste is filled in the gap of the toughened brown silk and forms a coating on the toughened brown silk; the framework layer comprises radial frameworks 301 arranged along the extension direction of the support layer cut-edge variable speed agricultural belt and buffer rubber compounded with the radial frameworks, the buffer rubber is filled in the gap of the radial frameworks and forms a coating on the radial frameworks, the radial framework cord is a high modulus low shrinkage 6x5 polyester hard cord; the top cloth layer comprises a top cloth 401 and a top adhesive compounded with the top cloth, the top adhesive is immersed in the top cloth and bonds the top cloth to the framework layer, and the cross-sectional shape of the agricultural belt is trapezoidal;

[0048] The raw materials of the bottom rubber layer include, by mass fraction: chlorobutyl rubber 3222 100 parts, stearic acid 1 part, nano zinc oxide 5 parts, magnesium oxide 4 parts, antioxidant ODA 2 parts, antioxidant 4010NA 1 part, 90 resin 2 parts, N330 55 parts, nylon short fibers 20 parts, and dibutyl ester 1 part, and accelerator DM 0.25 parts;

[0049] The adhesive paste is a m-cresol adhesive system, and the raw materials of the m-cresol adhesive system include, by mass fraction: 80 parts of chlorobutyl rubber 3222, 20 parts of standard rubber, 1 part of stearic acid, 5 parts of nano zinc oxide, 2 parts of antioxidant ODA, 2 parts of antioxidant 4010NA, 2.5 parts of malon, 40 parts of N550, 20 parts of N660, 13 parts of white carbon black, 2 parts of dibutyl ester, 0.8 parts of sulfur, 2 parts of DTDM, and 7 parts of adhesive RC;

[0050] A preparation method of the above support layer cut-edge variable speed agricultural belt, comprising the following steps:

[0051] Step 1: prepare the buffer rubber; the raw materials of the buffer rubber include, in mass fraction: 80 parts of chlorobutyl rubber 3222, 20 parts of standard rubber, 1 part of stearic acid, 5 parts of nano zinc oxide, 2 parts of antioxidant ODA, 2 parts of antioxidant 4010NA, 2.5 parts of coumarone, 40 parts of N550, 20 parts of N660, 13 parts of white carbon black, 2 parts of dibutyl ester, 0.8 parts of sulfur, 2 parts of DTDM, 7 parts of adhesive RC; first use the internal mixer to prepare the rubber compound, after inspection, roll out the rubber sheet on the calender, thickness 0.36±0.01 mm, coarse rolling roller temperature 45±5 ℃; the upper roller temperature of the calender is 80 ℃, the middle roller temperature is 65±5 ℃, the specified width is 505 mm, and the cloth is used to collect the roll;

[0052] Step 2: prepare the top rubber; the top rubber and the bottom rubber are the same kind of rubber material, the raw materials of the bottom rubber layer include, in mass fraction: 100 parts of chlorobutyl rubber 3222, 1 part of stearic acid, 5 parts of nano zinc oxide, 4 parts of magnesium oxide, 2 parts of antioxidant ODA, 1 part of antioxidant 4010NA, 2.5 parts of 90 resin, 55 parts of N330, 20 parts of nylon short fibers, 1 part of dibutyl ester, 0.25 parts of accelerator DM; first use the internal mixer to prepare the rubber compound, after inspection, roll out the rubber sheet on the calender, thickness 0.6±0.01 mm, coarse rolling roller temperature 45±5 ℃; the upper roller temperature of the calender is 80 ℃, the middle roller temperature is 55±5 ℃, the speed ratio of the calender is 1:1.25, the specified width is 1200 mm, the cloth is used to collect the roll, and the roll is spliced into a rubber sheet with fiber transverse arrangement on the transverse splicing machine;

[0053] Step 3: prepare the adhesive according to the raw materials of the m-tape white system; the raw materials of the buffer rubber include, in mass fraction: 80 parts of chlorobutyl rubber 3222, 20 parts of standard rubber, 1 part of stearic acid, 5 parts of nano zinc oxide, 2 parts of antioxidant ODA, 2 parts of antioxidant 4010NA, 2.5 parts of coumarone, 40 parts of N550, 20 parts of N660, 13 parts of white carbon black, 2 parts of dibutyl ester, 0.8 parts of sulfur, 2 parts of DTDM, 7 parts of adhesive RC; first use the internal mixer to prepare the rubber compound, after inspection, roll out the rubber sheet on the calender, thickness 0.36±0.01 mm, coarse rolling roller temperature 45±5 ℃; the upper roller temperature of the calender is 80 ℃, the middle roller temperature is 65±5 ℃, the specified width is 505 mm, and the cloth is used to collect the roll;

[0054] Step 4: The primer is prepared according to the raw materials of the primer; the raw materials of the primer layer include, by mass fraction: 100 parts of neoprene 3222, 1 part of stearic acid, 5 parts of nano zinc oxide, 4 parts of magnesium oxide, 2 parts of antioxidant ODA, 1 part of antioxidant 4010NA, 2.5 parts of 90 resin, 55 parts of N330, 20 parts of nylon short fibers, 1 part of dibutyl ester, and 0.25 parts of accelerator DM; first, a mixing mill is used to make a rubber compound, and after passing the inspection, a rubber sheet is extruded on a calender, with a thickness of 0.6±0.01 mm, and the roughing roller temperature is 45±5 ℃; the calender roller temperature is 80 ℃, the middle roller temperature is 55±5 ℃, the speed ratio of the calender is 1:1.25, the specified width is 1200 mm, and the cloth is used to collect the roll, and then the rubber sheet with fiber transverse arrangement is spliced on a transverse cutting splicer to form a roll;

[0055] Step 5: The dithiobis-thiazole is reacted with the epoxy resin at 90 ℃ for 20 min to 30 min, and then the diglycidyl ether is added to support the formation of the steel brown silk activator after the reaction exotherm reaches 120 ℃ for 2.5 h; the steel brown silk is immersed in the steel brown silk activator for 1 h, and then the steel brown silk is taken out and activated using the steel brown silk activator after being cured into a film at 60 ℃; the steel brown silk is woven into a steel brown silk cloth, and then the rubber-coated adhesive prepared in step 3 is coated and pressed into the steel brown silk cloth to form a rubber-coated adhesive composite steel brown silk cloth;

[0056] Step 6: The release agent is sprayed onto the surface of the mold, the top cloth is placed in the mold, the top rubber is placed on the top cloth and pressed to form a top rubber composite top cloth, the buffer rubber is placed on the top rubber composite top rubber, the string is wound on the buffer rubber with constant tension, a layer of buffer rubber is coated and pressed, a layer of rubber-coated adhesive composite steel brown silk cloth is placed on the buffer rubber and pressed, and finally the primer sheet is attached to the process specified thickness, the mold is removed and vulcanized, demolded and cut to form a support layer cut edge variable speed agricultural belt blank; the rubber-coated adhesive composite steel brown silk cloth is pressed using a four-roll calender, the temperatures of the 1st and 4th rollers are 90 ℃, and the temperatures of the 2nd and 3rd rollers are 70 ℃; the thickness of the pressed rubber is 1.8±0.1 mm, and the 2nd and 3rd rubber-coated rollers have cutters to ensure the neatness of the rubber edges; the vulcanization conditions include an external pressure of 1.0 KPa, an internal pressure of 0.4 KPa, a vulcanization time of 45 min, a thickness of 22.5 mm, and a cutting condition of a cutting width of 50.8±0.2 mm;

[0057] Step 7: The support layer cut edge variable speed agricultural belt blank is ground according to the required shape to form a support layer cut edge variable speed agricultural belt, the length of the grinding is controlled in the effective length range of 2307±10 mm, and the grinding wheel angle is 28±1 °.

[0058] Comparative Example 1

[0059] Comparative Example 1 does not have steel brown silk, and the other conditions are the same as those of Example 1.

[0060] Comparative Example 2

[0061] Comparative Example 2 is the same as Example 1 except that the tempered brown yarn is arranged in 4 layers.

[0062] Comparative Example 3

[0063] Comparative Example 3 is the same as Example 1 except that the nylon fiber in the bottom adhesive layer is replaced by aramid fiber and no transverse support layer is arranged.

[0064] Test Example

[0065] The support layer cut-edge variable speed agricultural belt prepared from Examples 1 to 3 and Comparative Examples 1 to 3 is tested, and the test items include: effective elongation, outer circumference change rate and fatigue life;

[0066] The effective elongation test method refers to GB / T 3686 V;

[0067] The fatigue life and outer circumference change rate test method refers to GB / T 12735;

[0068] Table 1 shows the test results;

[0069] Table 1 Fatigue life performance of support layer cut-edge variable speed agricultural belt

[0070] Effective elongation (%) Change rate of outer circumference (%) Difference between effective elongation and change rate of outer circumference Fatigue life (h) Example 1 5.34 1.54 3.8 145 Example 2 5.88 1.53 4.35 121 Comparative Example 1 8.28 2.82 5.46 83 Comparative Example 2 5.24 1.56 3.68 136 Comparative Example 3 3.29 1.54 1.75 127

[0071] As shown in Table 1, the above experimental results show that the fatigue life of the agricultural belt of Examples 1 to 2 can be 121 to 145 h, which is significantly improved compared with Comparative Example 1, and it can be seen that the use life of the agricultural belt can be significantly improved after arranging the transverse support layer, in addition, the fatigue life of the agricultural belt arranged with 2 layers of tempered brown yarn is the highest, which is significantly higher than that of the agricultural belt arranged with 1 layer and 4 layers of tempered brown yarn (Examples 2 and Comparative Example 2), and the fatigue life of the agricultural belt of the present application is significantly higher than that of aramid fiber, which shows that the use life of the agricultural belt provided by the present application is significantly improved;

[0072] The effective elongation can test the strength of the longitudinal flexibility of the agricultural belt, and from the test results of the effective elongation, it can be known that the effective elongation of the aramid fiber agricultural belt is significantly smaller than that of the agricultural belt provided by the present application, which shows that the longitudinal flexibility of the agricultural belt of the present application is significantly improved, and the longitudinal flexibility of the agricultural belt without tempered brown yarn in Comparative Example 1 is the highest, but it has already exceeded the application requirement of the agricultural belt (effective elongation ≤ 7%);

[0073] The outer circumference change rate can test the wear resistance of the agricultural belt, and the outer circumference change rate of the agricultural belt provided by the application is equivalent to that of the aramid fiber agricultural belt, and there is no obvious difference, which shows that the wear resistance of the agricultural belt provided by the application has no obvious difference with that of the aramid fiber agricultural belt, and both have good wear resistance.

[0074] The above is only a preferred embodiment of the application, and does not limit the application, and any simple modification, change and equivalent transformation of the above embodiment according to the technical essence of the application still belong to the protection scope of the technical solution of the application.

Claims

1. A method of making a supported layer skived variable speed farm implement belt, characterized by, The method comprises the following steps: The buffer glue, the top glue, the adhesive and the bottom glue are prepared, the tempered brown silk is activated by using a tempered brown silk activator, the tempered brown silk is woven into a tempered brown silk cloth in a transverse direction, the adhesive is coated and pressed into the tempered brown silk cloth to form an adhesive composite tempered brown silk cloth, the framework layer comprises a radial framework (301) and buffer glue combined with the radial framework, the top cloth, the top glue, the framework layer, the adhesive composite tempered brown silk cloth, the buffer glue and the bottom glue are sequentially arranged in a mold, and vulcanization, demolding, cutting and grinding are performed to form a support layer edge-cut variable speed agricultural belt. The agricultural belt comprises a bottom glue layer (1), a transverse support layer (2) located on the bottom glue layer, a framework layer (3) located on the tempered brown silk composite layer and a top cloth layer (4) located on the framework layer, the bottom glue layer comprises nylon short fibers, the transverse support layer comprises transversely woven tempered brown silk (201) and adhesive combined with the transversely woven tempered brown silk, and the radial framework is a wire rope.

2. The production method according to claim 1, characterized by, The diameter of the tempered brown silk is 1-1.4 mm, and the spacing of the tempered brown silk is 2-2.2 mm.

3. The production method according to claim 2, characterized by, The diameter of the tempered brown silk is 1.4 mm.

4. The production method according to claim 2, characterized by, The spacing of the tempered brown silk is 2.2 mm.

5. The preparation method according to claim 1, characterized in that, The top cloth layer comprises a top cloth (401) and top glue combined with the top cloth.

6. The production method according to claim 1, characterized by, The co-reaction step comprises: reacting dimercaptothiadiazole and epoxy resin at 90-95 DEG C for 20-30 min, then adding di-glycidyl ether to react and release heat to 110-120 DEG C, and then keeping the temperature for 2-2.5 h.

7. The production method according to claim 6, characterized by, The dimercaptothiadiazole and the epoxy resin are reacted at 90 DEG C for 20-30 min, then the di-glycidyl ether is added to react and release heat to 120 DEG C, and then keeping the temperature for 2.5 h.

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