Silicone-free transmission belt

Abstract

The invention discloses a silicone-free transmission belt which comprises a belt body and a strength layer, a formula is optimized in the scheme, a silicone component is abandoned, and DCP, sulfur and a vulcanization system are used for vulcanization, so that the tensile strength, the bonding performance and the aging resistance of the transmission belt are improved; the modified titanium oxide and aluminum oxide are matched with the modified attapulgite, expanded graphite and the like, so that the wear resistance, tensile strength and the like of the transmission belt are improved, and the bonding capacity of a sizing material and a strong layer is improved by adding the bonding agent.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission belts, and particularly to a silicone-free transmission belt. Background Art

[0002] Silicone oil is a common additive in rubber products. It can improve various properties of rubber, such as wear resistance, aging resistance, etc., and can also improve the quality and service life of rubber products. In the production of rubber materials, silicone oil is usually added to the raw materials by adding additives and mechanical mixing. After being evenly mixed with other components, products are then made. It should be noted that in some application fields of transmission belts, such as painting, silicone oil is prone to decompose at high temperatures, which may lead to phenomena such as shrinkage holes in subsequent painting. Therefore, our company plans to initiate a project to develop a silicone-free transmission belt. Summary of the Invention

[0003] To solve the above at least one technical defect, the present invention provides the following technical solutions:

[0004] This application document discloses a silicone-free transmission belt, including a belt body and a reinforcing layer. By mass, the belt body includes the following components: 100 parts of HNBR, 4 - 7 parts of zinc oxide, 0.6 - 1.2 parts of antioxidant, 0.5 - 0.9 parts of stearic acid, 10 - 15 parts of carbon black, 1 - 3 parts of modified attapulgite, 2 - 4 parts of modified expanded graphite, 0.6 - 1.2 parts of modified alumina, 0.3 - 0.6 parts of modified titanium oxide, 0.8 - 1.1 parts of sulfur, 1 - 2 parts of accelerator, 4 - 6 parts of DCP, 0.8 - 1.2 parts of TAIC, 7 - 9 parts of adhesive, and 4 - 6 parts of plasticizer.

[0005] In this solution, the preferred formula abandons the silicone component and uses a vulcanization system with a combination of DCP and sulfur for vulcanization, which helps to improve the tensile strength, adhesion performance and aging resistance of the transmission belt. The combination of modified titanium oxide and alumina with modified attapulgite, expanded graphite, etc. helps to improve the wear resistance, tensile strength, etc. of the transmission belt. Increasing the adhesive helps to improve the adhesion ability between the rubber compound and the reinforcing layer.

[0006] Further, the modified attapulgite is formed by acidification treatment and then modifying attapulgite with supercritical carbon dioxide-assisted co-solvent and coupling agent. Acidification treatment helps to partially depolymerize crystal bundles, remove mineral impurities such as carbonate in attapulgite, increase pores, and facilitate the entry of critical carbon dioxide and coupling agent, etc. into the pores to fully contact and graft, improving the modification effect.

[0007] Further, attapulgite is added to dilute hydrochloric acid, stirred for 1 - 6 h and then screened. After drying, it is added to a reaction kettle, and a mixture of co-solvent and coupling agent is added when carbon dioxide is in a supercritical state for 10 - 15 min.

[0008] Further, at 70 - 100 °C and a pressure of 10 - 16 MPa, carbon dioxide is in a supercritical state. The cosolvent and the coupling agent are mixed at a mass ratio of 1 - 3:1. The low temperature and high pressure can avoid the change of the coupling agent and improve the modification effect.

[0009] Further, expandable graphite is modified with the coupling agent IPTS to form modified expandable graphite, alumina is modified with a titanate coupling agent to form modified alumina, and titanium oxide is modified with a silane coupling agent to form modified titanium oxide. The coupling agent is preferably selected to improve the modification effect.

[0010] Further, the binder is composed of binder RC, binder 1756HS, and Dymalink634 at a mass ratio of 2 - 3:1:2. The composition of the binder is preferably selected to improve the adhesion performance between the rubber compound and the reinforcement layer.

[0011] Further, the plasticizer is DOP, the accelerator is accelerator DM, the carbon black is N330, and the reinforcement layer is a glass fiber rope.

[0012] Further, the vulcanization process includes primary vulcanization and secondary vulcanization. Among them, the temperature in primary vulcanization is 168 - 172 °C and the time is 30 - 45 min. The temperature in secondary vulcanization is 146 - 152 °C and the time is 4 - 5 h. The two-stage vulcanization process helps to improve the aging resistance.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] 1. The present invention abandons silicone oil and preferably selects the formula components, which helps to improve the strength, aging resistance, wear resistance, and adhesion strength with the reinforcement layer of the transmission belt in combination. Specific Embodiments

[0015] The following further illustrates the present invention with specific embodiments.

[0016] The preparation of modified attapulgite: Attapulgite is immersed in dilute hydrochloric acid (1%), the solid-liquid ratio is 1:10, stirred for 3 h, screened through a 200-mesh sieve, dehydrated, dried at 110 °C, ground, and then screened through a 200-mesh sieve. The sieved dry powder is added to a reaction kettle. At 70 °C and 15 MPa, carbon dioxide is in a supercritical state, and ethanol is used as a cosolvent. Ethanol and KH570 are mixed at a mass ratio of 5:1 and extruded into the reaction kettle for 12 min, taken out and dried, and ground and screened through a 200-mesh sieve to obtain modified attapulgite.

[0017] The preparation of modified expandable graphite, modified alumina, and modified titanium oxide is carried out by soaking the corresponding materials in an ethanol solution containing a coupling agent. Among them, expandable graphite is modified with the coupling agent IPTS, nano-alumina is modified with a titanate coupling agent JSC, and nano-titanium oxide is modified with a silane coupling agent KH570.

[0018] The adhesive is composed of adhesive RC, adhesive 1756HS, and Dymalink 634 in a mass ratio of 3:1:2.

[0019] Example 1

[0020] The silicone-free drive belt includes a belt body and a reinforcing layer. The reinforcing layer is a fiberglass rope. By mass, the belt body includes the following components: 100 parts of HNBR, 5 parts of zinc oxide, 0.8 part of antioxidant, 0.5 part of stearic acid, 12 parts of carbon black, 2 parts of modified attapulgite, 3 parts of modified expanded graphite, 0.9 part of modified alumina, 0.5 part of modified titanium oxide, 1 part of sulfur, 1 part of accelerator, 5 parts of DCP, 1 part of TAIC, 8 parts of adhesive, and 5 parts of plasticizer.

[0021] Preparation process: First, thin-pass the HNBR 4 times on an open mill, then thin-pass the plasticized rubber stock and make 8 triangular bales. After that, add zinc oxide, antioxidant 4010NA, stearic acid, carbon black N330, modified attapulgite, modified expanded graphite, modified alumina, modified titanium oxide, sulfur, accelerator DM, DCP, TAIC, adhesive, and plasticizer DOP for mixing. After adding each component, cut the knife left and right and turn it over and knead it three times. After all components are added, thin-pass it 4 times and then take out the sheet to obtain a rubber sheet.

[0022] Compound the rubber sheet with the fiberglass rope skeleton and vulcanize it. First-stage vulcanization: temperature 170°C, 12 MPa, time 30 min. Second-stage vulcanization: temperature 150°C, 12 MPa, time 4 h.

[0023] Example 2

[0024] The silicone-free drive belt includes a belt body and a reinforcing layer. The reinforcing layer is a fiberglass rope. By mass, the belt body includes the following components: 100 parts of HNBR, 6 parts of zinc oxide, 1 part of antioxidant, 0.6 part of stearic acid, 13 parts of carbon black, 3 parts of modified attapulgite, 4 parts of modified expanded graphite, 1 part of modified alumina, 0.6 part of modified titanium oxide, 1 part of sulfur, 1 part of accelerator, 6 parts of DCP, 1.2 parts of TAIC, 7 parts of adhesive, and 4 parts of plasticizer.

[0025] Preparation process: First, thin-pass the HNBR 4 times on an open mill, then thin-pass the plasticized rubber stock and make 8 triangular bales. After that, add zinc oxide, antioxidant 4010NA, stearic acid, carbon black N330, modified attapulgite, modified expanded graphite, modified alumina, modified titanium oxide, sulfur, accelerator DM, DCP, TAIC, adhesive, and plasticizer DOP for mixing. After adding each component, cut the knife left and right and turn it over and knead it three times. After all components are added, thin-pass it 4 times and then take out the sheet to obtain a rubber sheet.

[0026] Compound the film with the fiberglass rope skeleton and vulcanize it. First-stage vulcanization: temperature 170°C, 12 MPa, time 40 min. Second-stage vulcanization: temperature 150°C, 12 MPa, time 5 h.

[0027] Example 3

[0028] The silicone-free drive belt includes a belt body and a reinforcing layer. The reinforcing layer is a fiberglass rope. By mass, the belt body includes the following components: 100 parts of HNBR, 7 parts of zinc oxide, 1.2 parts of antioxidant, 0.8 parts of stearic acid, 15 parts of carbon black, 2 parts of modified attapulgite, 2 parts of modified expanded graphite, 0.7 parts of modified alumina, 0.4 parts of modified titanium oxide, 1 part of sulfur, 1 part of accelerator, 5 parts of DCP, 1 part of TAIC, 8 parts of adhesive, and 5 parts of plasticizer.

[0029] Preparation process: First, thinly pass the HNBR 4 times on an open mill, thinly pass the plasticized rubber stock and make triangular packages 8 times. Then add zinc oxide, antioxidant 4010NA, stearic acid, carbon black N330, modified attapulgite, modified expanded graphite, modified alumina, modified titanium oxide, sulfur, accelerator DM, DCP, TAIC, adhesive, and plasticizer DOP for mixing. After adding each component, cut the knife left and right and turn it over and knead it three times. After all the components are added, thinly pass it 4 times and then take out the sheet to obtain the film.

[0030] Compound the film with the fiberglass rope skeleton and vulcanize it. First-stage vulcanization: temperature 168°C, 12 MPa, time 45 min. Second-stage vulcanization: temperature 152°C, 12 MPa, time 4 h.

[0031] Example 4

[0032] The silicone-free drive belt includes a belt body and a reinforcing layer. The reinforcing layer is a fiberglass rope. By mass, the belt body includes the following components: 100 parts of HNBR, 5 parts of zinc oxide, 1 part of antioxidant, 0.8 parts of stearic acid, 15 parts of carbon black, 3 parts of modified attapulgite, 3 parts of modified expanded graphite, 1 part of modified alumina, 0.6 parts of modified titanium oxide, 1 part of sulfur, 1.5 parts of accelerator, 6 parts of DCP, 1 part of TAIC, 9 parts of adhesive, and 6 parts of plasticizer.

[0033] Preparation process: First, thinly pass the HNBR 4 times on an open mill, thinly pass the plasticized rubber stock and make triangular packages 8 times. Then add zinc oxide, antioxidant 4010NA, stearic acid, carbon black N330, modified attapulgite, modified expanded graphite, modified alumina, modified titanium oxide, sulfur, accelerator DM, DCP, TAIC, adhesive, and plasticizer DOP for mixing. After adding each component, cut the knife left and right and turn it over and knead it three times. After all the components are added, thinly pass it 4 times and then take out the sheet to obtain the film.

[0034] The film is compounded with a fiberglass rope skeleton and vulcanized. The first-stage vulcanization: temperature 170°C, 12 MPa, time 30 min. The second-stage vulcanization: temperature 150°C, 12 MPa, time 4 h.

[0035] Comparative Example 1

[0036] Compared with Example 4, the difference is that in this example, the attapulgite is not modified and is directly added.

[0037] The prepared conveyor belts are tested as shown in Table 1 and Table 2:

[0038] Table 1

[0039] Tensile strength MPa <![CDATA[Wear volume cm 3 > Pull-out force N Hardness HA Example 1 26.3 0.015 306 80 Example 2 27.6 0.013 308 83 Example 3 26.8 0.014 305 79 Example 4 27.9 0.012 307 85 Comparative Example 1 18.6 0.027 303 72

[0040] Table 2

[0041] Tensile strength MPa Hardness HA Example 1 24.5 85 Comparative Example 1 14.7 76

[0042] Table 2 shows the test data after the aging resistance test of Example 1 and Comparative Example 1. It can be seen from Table 1 and Table 2 that this conveyor belt performs excellently in terms of tensile strength, wear resistance, aging resistance, adhesion strength with the ply, etc. From the microscopic morphology, the modified attapulgite is basically dissociated into nanofibers in the rubber compound, is well dispersed in the rubber compound, and has good interfacial adhesion with the rubber compound.

[0043] The above is only the preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A silicone-free drive belt, comprising a belt body and a carcass ply, characterized in that, By mass, the belt body comprises the following components: 100 parts of HNBR, 4 - 7 parts of zinc oxide, 0.6 - 1.2 parts of antioxidant, 0.5 - 0.9 parts of stearic acid, 10 - 15 parts of carbon black, 1 - 3 parts of modified attapulgite, 2 - 4 parts of modified expanded graphite, 0.6 - 1.2 parts of modified alumina, 0.3 - 0.6 parts of modified titanium oxide, 0.8 - 1.1 parts of sulfur, 1 - 2 parts of accelerator, 4 - 6 parts of DCP, 0.8 - 1.2 parts of TAIC, 7 - 9 parts of adhesive, and 4 - 6 parts of plasticizer.

2. The silicone-free drive belt according to claim 1, characterized in that: The modified attapulgite is formed by acidifying attapulgite and then modifying it with supercritical carbon dioxide assisted co - solvent and coupling agent.

3. The silicone-free drive belt according to claim 2, wherein: Add attapulgite into dilute hydrochloric acid, stir for 1 - 6 h, then sieve, dry and add it into a reaction kettle. Add the mixture of co - solvent and coupling agent when carbon dioxide is in the supercritical state for 10 - 15 min.

4. The silicone-free drive belt according to claim 3, characterized in that: Under the conditions of 70 - 100 °C and 10 - 16 MPa, make carbon dioxide in the supercritical state, and the co - solvent and coupling agent are mixed in a mass ratio of 1 - 3:

1.

5. The silicone-free drive belt according to claim 1, characterized in that: Modify expanded graphite with coupling agent IPTS to form modified expanded graphite, modify alumina with titanate coupling agent to form modified alumina, and modify titanium oxide with silane coupling agent to form modified titanium oxide.

6. The silicone-free drive belt according to claim 1, wherein: The adhesive is composed of adhesive RC, adhesive 1756HS, and Dymal ink634 in a mass ratio of 2 - 3:1:

2.

7. The silicone-free drive belt according to claim 1, characterized in that: The plasticizer is DOP, the accelerator is accelerator DM, the carbon black is N330, and the reinforcement layer is a glass fiber rope.

8. The silicone-free drive belt according to claim 1, wherein: The vulcanization process includes primary vulcanization and secondary vulcanization. In primary vulcanization, the temperature is 168 - 172 °C and the time is 30 - 45 min. In secondary vulcanization, the temperature is 146 - 152 °C and the time is 4 - 5 h.