Rewinder bottom roller rubber formula and preparation method thereof

Abstract

The bottom roller rubber is prepared from the following raw material components in parts by weight: 100 parts of chlorosulfonated polyethylene rubber, 60 to 70 parts of diatomite, 10 to 15 parts of plasticizer, 5 to 8 parts of titanium dioxide, 2 to 3 parts of color masterbatch, 7 to 10 parts of magnesium oxide, 2 to 3 parts of dispersing agent, 0.5 to 1 part of accelerant A, 1 to 1.5 parts of accelerant B, 2 to 3 parts of active agent, 15 to 20 parts of functional additive, 4 to 5 parts of tackifying resin and 2 to 3 parts of fluororesin micro powder. By adopting the chlorosulfonated ethylene rubber, the aging resistance of the rewinding machine under a high-speed running condition during online use is improved, and the service life of the rewinding machine is prolonged. Meanwhile, the diatomite, the plasticizer and the dispersing agent are matched for use, so that the mixing manufacturability of chlorosulfonated polyethylene is improved, the common phenomena of scorching and roller sticking in the chlorosulfonated polyethylene rubber mixing process are avoided, the self-adhesion of the mixed rubber is poor, and the quality of the mixed rubber and the mixing efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of a rewinder bottom roller, in particular to a rewinder bottom roller rubber formula and a preparation method thereof. Background Art

[0002] With the continuous increase of new paper machine projects in the papermaking market, paper mills are constantly expanding their scale and production capacity, the line speed of paper machine production is getting faster and faster, and the internal roll in the papermaking market is becoming more and more serious, which has put forward higher requirements on the quality and price of papermaking rubber rollers, especially the bottom rollers of rewinders, which are key spare parts in the paper rewinding and slitting process. The competition in the papermaking rubber roller market is also becoming increasingly fierce, and the requirements for quality are getting higher and higher. With the continuous increase in the speed of the rewinder, the friction heat generation of the bottom roller of the rewinder is accelerated during use, and quality problems such as early aging and degumming are prone to occur. It is imperative to improve the quality of the bottom roller and extend its service life. In order to maintain and expand the market, improving product quality and reducing production costs are also eternal topics for rubber roller companies. .

[0003] In the existing technology, the bottom roller of the rewinder is mostly coated with nitrile rubber, but nitrile rubber has low temperature resistance, is prone to aging and has a short life under high line speed conditions, and needs to be replaced with a rubber material with better temperature resistance. Chlorosulfonated polyethylene rubber has good temperature resistance, but its production process is poor. During the production process, the rubber is prone to scorch and has poor self-adhesion. In the production of the open mill, it is easy to stick to the roller.

[0004] Therefore, it is necessary to develop a special formula for the rubber of the bottom roller of the rewinder to solve the above problems. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the present invention provides a rubber formula for a bottom roller of a rewinder and a preparation method thereof, which improves the processability of extrusion rubber coating, and improves the rubber coating production efficiency and the quality of the final product.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solution: The present invention discloses a rewinding machine bottom roller rubber, which comprises the following raw material components by weight: 100 parts of chlorosulfonated polyethylene rubber, 60-70 parts of diatomaceous earth, 10-15 parts of plasticizer, 5-8 parts of titanium dioxide, 2-3 parts of masterbatch, 7-10 parts of magnesium oxide, 2-3 parts of dispersant, 0.5-1 part of accelerator A, 1-1.5 parts of accelerator B, 2-3 parts of activator, 15-20 parts of functional additive, 4-5 parts of tackifying resin, and 2-3 parts of fluororesin micropowder.

[0009] Furthermore, the chlorosulfonated polyethylene rubber model is TS-530, the diatomaceous earth model is N85, the plasticizer model is TP-759, the magnesium oxide model is MgO-70, the dispersant model is dispersant RF, the accelerator A model is DM-75, the accelerator B model is DPTT-70, the activator model is PEG4000, the functional additive model is TP800, and the tackifying resin is koresin tackifying resin.

[0010] The present invention also discloses a method for preparing the rubber of the bottom roller of a rewinding machine, comprising the following steps:

[0011] S1. Plasticizing of raw rubber: Adjust the roller distance of the open mill to the minimum, start the open mill and turn on the cooling water, place 100 parts of chlorosulfonated polyethylene rubber on the open mill for plasticizing, and add 2-3 parts of masterbatch, 2-3 parts of dispersant, and 4-5 parts of tackifying resin at the same time, plasticize for 8-10 minutes until the plasticized rubber has a certain self-adhesiveness, pack it into triangles and leave it for no less than 12 hours;

[0012] S2, rubber compound mixing: the plasticized rubber after being parked in step S1 is plasticized in an internal mixer for 40-50s, and then 60-70 parts of diatomaceous earth, 10-15 parts of plasticizer, 2-3 parts of fluororesin powder, 5-8 parts of titanium dioxide, 2-3 parts of activator, and 15-20 parts of functional additives are added. After mixing for 110-120s, the plug is lifted for 90-100s. The mixing temperature reaches 110-120°C for rubber discharge. The mixed rubber is directly placed on the roller of the open mixer. After the surface of the roller is smooth, 7-10 parts of magnesium oxide, .5-1 parts of accelerator A, and 1-1.5 parts of accelerator B are added in 2-3 times. After all the above-mentioned compounding agents are mixed, the knife is turned over, and the rubber is thinly rolled into 2-3 rolls and 3 triangle packages to produce strips. The thickness of the rubber strip is 10-12mm and the width is 90-100mm. The rubber strip is naturally cooled and used for extrusion and rubber coating;

[0013] S3, extrusion wrapping and rubber coating: feed the mixed rubber strip in step S2 into the screw extruder, extrude the film with a thickness of 2.0-4.0mm and a width of 60-70mm, start the rotary rubber coating machine after the film is uniform, and wrap the rubber strip around the prepared metal roller core. After the roller core is cleaned by sandblasting, apply adhesive, and wrap the rubber layer by layer until the thickness of one side of the rubber coating reaches 15-25mm. After the rubber coating is completed, wrap 3-4 layers of nylon water cloth on the rubber surface;

[0014] S4, vulcanization in a vulcanization tank: the rubber roller coated in step S3 is sent into a vulcanization tank, and after the tank door is closed, steam is introduced into the vulcanization tank, and vulcanization is performed by gradually increasing the temperature in a stepwise manner and vulcanizing at low temperature for a long time. While introducing steam, the compressed air valve is opened, and compressed air is introduced to make the pressure in the vulcanization tank reach 5.5-6.0 atmospheres within 0.5 hours; after the vulcanization is completed, the air pressure valve and the steam valve are closed, and the pressure drops. When the pressure gauge pointer points to zero, the safety pin is opened, and the steam discharged from the pin hole floats. The vulcanization tank is half-opened to allow the temperature to drop. When the temperature in the tank is lower than 60°C or equivalent to room temperature, the rubber roller is pulled out;

[0015] S5, lathing and grinding: the rubber roller naturally cooled to room temperature in step S4 is roughly machined on a lathe, and then finely machined on a CNC grinder until the roller surface roughness reaches 0.8-1.6 μm.

[0016] Furthermore, in step S3, after applying the adhesive and before wrapping the rubber, a layer of chlorosulfonated polyethylene glue is applied on the metal roller core.

[0017] (III) Beneficial technical effects

[0018] Compared with the prior art, the present invention has the following experimental principles and beneficial technical effects:

[0019] (1) The present invention improves the aging resistance of the rewinder under high-speed operation conditions when the rewinder is used online by using chlorosulfonated ethylene rubber, thereby extending the service life of the rewinder. At the same time, by using diatomaceous earth, plasticizer and dispersant, the mixing processability of chlorosulfonated polyethylene is improved, the common scorching, sticking to rollers and poor self-adhesiveness of the mixed rubber in the mixing process of chlorosulfonated polyethylene rubber are avoided, and the quality and mixing efficiency of the mixed rubber are improved.

[0020] (2) By applying a layer of chlorosulfonated polyethylene glue on the metal roller core before winding the rubber lagging, the bonding effect between the extruded rubber strip and the metal roller core is improved, and the production efficiency of the extruded rubber lagging is improved. DETAILED DESCRIPTION

[0021] To achieve the above object, the present invention provides the following specific implementation methods and embodiments:

[0022] Example 1

[0023] The rubber formula and preparation method of the rewinder bottom roller of the present invention are adopted to produce two rewinder bottom rollers with specifications of Φ900×Φ880×8350, and the roller surface hardness is required to be 70±5P&J. This batch of rewinder bottom rollers is a new roller core rubber coating project of a foreign-funded paper machine company.

[0024] The compound rubber formula includes the following raw material components by weight: 100 parts of chlorosulfonated polyethylene rubber TS-530, 60 parts of diatomaceous earth N85, 10 parts of plasticizer TP-759, 8 parts of titanium dioxide, 2 parts of masterbatch, 7 parts of magnesium oxide MgO-70, 2 parts of dispersant RF, 1 part of accelerator DM-75, 1 part of accelerator DPTT-70, 2 parts of active agent PEG4000, 20 parts of functional additive TP800, 4 parts of tackifying resin koresin, and 2 parts of fluororesin micropowder. The raw materials of the above formula are all commercially available materials.

[0025] Here are the steps:

[0026] S1. Plastication of raw rubber: adjust the roller distance of the open mill to the minimum, start the open mill and turn on the cooling water, place 100 parts of chlorosulfonated polyethylene rubber on the open mill for plastication, and add 2 parts of masterbatch, 2 parts of dispersant RF, and 4 parts of tackifying resin koresin at the same time, plasticate for 9 minutes until the plasticized rubber has a certain self-adhesiveness, pack it into triangles and leave it for no less than 12 hours;

[0027] S2, rubber compound mixing: the plasticized rubber after being parked in step S1 is plasticized in an internal mixer for 50 seconds, and then 60 parts of diatomaceous earth N85, 10 parts of plasticizer TP-759, 2 parts of fluororesin powder, 8 parts of titanium dioxide, 2 parts of active agent PEG4000, and 20 parts of functional additive TP800 are added. After mixing for 110 seconds, the plug is lifted for 100 seconds. The mixing temperature reaches 110°C for rubber discharge. The mixed rubber is directly placed on the roller of the open mixer. After the surface of the roller is smooth, 7 parts of magnesium oxide MgO-70, 1 part of accelerator DM-75, and 1 part of accelerator DPTT-70 are added in 3 times. After all the above-mentioned compounding agents are mixed, the knife is turned over, and the rubber is thinly rolled into 2 rolls and 3 triangle packages, and then strips are produced. The thickness of the rubber strip is 10 mm and the width is 100 mm. The rubber strip is naturally cooled for extrusion and rubber coating;

[0028] S3, extrusion wrapping and rubber coating: feed the mixed rubber strip in step S2 into the screw extruder, extrude a film with a thickness of 2.0mm and a width of 70mm, start the rotary rubber coating machine after the film is uniform, and wrap the rubber strip around the prepared metal roller core. After the roller core is cleaned by sandblasting, apply adhesive and chlorosulfonated polyethylene glue, wrap the rubber layer by layer until the thickness of one side of the rubber coating reaches 16mm. After the rubber coating is completed, wrap 3 layers of nylon water cloth on the rubber surface;

[0029] S4, vulcanization in a vulcanization tank: the rubber roller coated in step S3 is sent into a vulcanization tank, and after the tank door is closed, steam is introduced into the vulcanization tank, and vulcanization is performed by gradually increasing the temperature in a stepwise manner and vulcanizing at a low temperature for a long time. While introducing steam, the compressed air valve is opened, and compressed air is introduced to make the pressure in the vulcanization tank reach 5.5 atmospheres within 0.5 hours; after the vulcanization is completed, the air pressure valve and the steam valve are closed, and the pressure drops. When the pressure gauge pointer points to zero, the safety pin is opened, and the steam discharged from the pin hole is allowed to float. The vulcanization tank is half-opened to allow the temperature to drop. When the temperature in the tank is lower than 60°C, the rubber roller is pulled out;

[0030] Among them, the vulcanization pressure of the vulcanization tank is: 0.55MPa, and the heating and insulation process is:

[0031] 1. Raise the temperature to 95°C in 2 hours;

[0032] 2. Keep warm at 95℃ for 3 hours;

[0033] 3. Heat to 115℃ and keep warm for 2 hours;

[0034] 4. Keep at 115℃ for 2 hours;

[0035] 5. Raise the temperature to 133°C in 1 hour;

[0036] 6.Keep warm at 133℃ for 10 hours.

[0037] S5, lathing and grinding: the rubber roller naturally cooled to room temperature in step S4 is roughly machined on a lathe, and then finely machined on a CNC grinder until the roller surface roughness reaches 1.6 μm.

[0038] After processing, the bottom rollers of this batch of rewinders were left to rest naturally until the roller surface reached room temperature. The roller surface hardness was measured to be 70,71P&J. They were delivered to customers and used online for more than one year without any quality abnormalities.

[0039] Example 2

[0040] The rubber formula and preparation method of the rewinder bottom roller of the present invention are used to produce two rewinder bottom rollers with specifications of Φ1000×Φ975×8700, and the roller surface hardness requirement is 65±5P&J. This batch of rewinder bottom rollers are replaced and re-rubberized rollers of a foreign-funded paper machine company.

[0041] The compound rubber formula includes the following raw material components by weight: 100 parts of chlorosulfonated polyethylene rubber TS-530, 70 parts of diatomaceous earth N85, 15 parts of plasticizer TP-759, 5 parts of titanium dioxide, 3 parts of masterbatch, 10 parts of magnesium oxide MgO-70, 3 parts of dispersant RF, 0.5 parts of accelerator DM-75, 1.5 parts of accelerator DPTT-70, 3 parts of active agent PEG4000, 15 parts of functional additive TP800, 5 parts of tackifying resin koresin, and 3 parts of fluororesin micropowder. The raw materials of the above formula are all commercially available materials.

[0042] Here are the steps:

[0043] S1. Plastication of raw rubber: adjust the roller distance of the open mill to the minimum, start the open mill and turn on the cooling water, place 100 parts of chlorosulfonated polyethylene rubber on the open mill for plastication, and add 3 parts of masterbatch, 3 parts of dispersant RF, and 5 parts of tackifying resin koresin at the same time, plasticate for 10 minutes until the plasticized rubber has a certain self-adhesiveness, pack it into triangles and leave it for no less than 12 hours;

[0044] S2, rubber compound mixing: the plasticized rubber after being parked in step S1 is plasticized in an internal mixer for 40 seconds, and then 70 parts of diatomaceous earth N85, 15 parts of plasticizer TP-759, 3 parts of fluororesin micropowder, 5 parts of titanium dioxide, 3 parts of active agent PEG4000, and 15 parts of functional additive TP800 are added. After mixing for 110 seconds, the plug is lifted for 100 seconds. The mixing temperature reaches 110°C for rubber discharge. The mixed rubber is directly placed on the roller of the open mixer. After the surface of the roller is smooth, 10 parts of magnesium oxide MgO-70, 0.5 parts of accelerator DM-75, and 1.5 parts of accelerator DPTT-70 are added twice. After all the above-mentioned compounding agents are mixed, the knife is turned over, and the rubber is thinly rolled into 2 rolls and 3 triangle packages, and then strips are produced. The thickness of the rubber strip is 11 mm and the width is 90 mm. The rubber strip is naturally cooled for extrusion and rubber coating;

[0045] S3, extrusion wrapping and rubber coating: feed the mixed rubber strip in step S2 into the screw extruder, extrude a film with a thickness of 2.0mm and a width of 60mm, start the rotary rubber coating machine after the film is uniform, and wrap the rubber strip around the prepared metal roller core. After the roller core is cleaned by sandblasting, apply adhesive and chlorosulfonated polyethylene glue, and wrap the rubber layer by layer until the thickness of the rubber coating reaches 19mm (including processing allowance). After the rubber coating is completed, wrap 4 layers of nylon water cloth on the rubber surface;

[0046] S4, vulcanization in a vulcanization tank: the rubber roller coated in step S3 is sent into a vulcanization tank, and after the tank door is closed, steam is introduced into the vulcanization tank, and vulcanization is performed by gradually increasing the temperature in a stepwise manner and vulcanizing at a low temperature for a long time. While introducing steam, the compressed air valve is opened, and compressed air is introduced to make the pressure in the vulcanization tank reach 6.0 atmospheres within 0.5 hours; after the vulcanization is completed, the air pressure valve and the steam valve are closed, and the pressure drops. When the pressure gauge pointer points to zero, the safety pin is opened, and the steam discharged from the pin hole is allowed to float. The vulcanization tank is half-opened to allow the temperature to drop. When the temperature in the tank is lower than 60°C, the rubber roller is pulled out;

[0047] Among them, the vulcanization pressure of the vulcanization tank is: 6.0MPa, and the heating and insulation process is:

[0048] 1. Raise the temperature to 95°C in 2 hours;

[0049] 2. Keep warm at 95℃ for 3 hours;

[0050] 3. Heat to 115℃ and keep warm for 2 hours;

[0051] 4. Keep at 115℃ for 2 hours;

[0052] 5. Raise the temperature to 133°C in 1 hour;

[0053] 6.Keep warm at 133℃ for 10 hours.

[0054] S5, lathing and grinding: the rubber roller naturally cooled to room temperature in step S4 is roughly machined on a lathe, and then finely machined on a CNC grinder until the roller surface roughness reaches 1.0 μm.

[0055] After processing, the bottom rollers of this batch of rewinders were left to rest naturally until the roller surface reached room temperature. The roller surface hardness was measured to be 66,67P&J. They were delivered to customers and used online for more than one year without any quality abnormalities.

[0056] As can be seen from Examples 1 and 2, the rewinder bottom roller rubber formula and preparation method of the present invention have good production process stability, high production efficiency, good customer online use effect, long service life, and meet customer use requirements. It can be mass-produced, improve production efficiency, reduce production costs and customer use costs, and achieve good economic and social benefits.

Claims

1. A rewinding machine bottom roller rubber, characterized in that: The raw material components are as follows: 100 parts of chlorosulfonated polyethylene rubber, 60-70 parts of diatomaceous earth, 10-15 parts of plasticizer, 5-8 parts of titanium dioxide, 2-3 parts of masterbatch, 7-10 parts of magnesium oxide, 2-3 parts of dispersant, 0.5-1 part of accelerator A, 1-1.5 parts of accelerator B, 2-3 parts of activator, 15-20 parts of functional additive, 4-5 parts of tackifying resin and 2-3 parts of fluororesin micropowder.

2. The bottom roller formula of the rewinding machine according to claim 1, characterized in that: The model of the chlorosulfonated polyethylene rubber is TS-530, the model of the diatomaceous earth is N85, the model of the plasticizer is TP-759, the model of the magnesium oxide is MgO-70, the model of the dispersant is dispersant RF, the model of the accelerator A is DM-75, the model of the accelerator B is DPTT-70, the model of the active agent is PEG4000, the model of the functional additive is TP800, and the tackifying resin is koresin tackifying resin.

3. The method for preparing the bottom roller rubber of a rewinding machine according to any one of claims 1 to 2, characterized in that: The following steps are involved: S1. Plasticizing of raw rubber: Adjust the roller distance of the open mill to the minimum, start the open mill and turn on the cooling water, place 100 parts of chlorosulfonated polyethylene rubber on the open mill for plasticizing, and add 2-3 parts of masterbatch, 2-3 parts of dispersant, and 4-5 parts of tackifying resin at the same time, plasticize for 8-10 minutes until the plasticized rubber has a certain self-adhesiveness, pack it into triangles and leave it for no less than 12 hours; S2, rubber compound mixing: the plasticized rubber after being parked in step S1 is plasticized in an internal mixer for 40-50s, and then 60-70 parts of diatomaceous earth, 10-15 parts of plasticizer, 2-3 parts of fluororesin powder, 5-8 parts of titanium dioxide, 2-3 parts of activator, and 15-20 parts of functional additives are added. After mixing for 110-120s, the plug is lifted for 90-100s. The mixing temperature reaches 110-120°C for rubber discharge. The mixed rubber is directly placed on the roller of the open mixer. After the surface of the roller is smooth, 7-10 parts of magnesium oxide, .5-1 parts of accelerator A, and 1-1.5 parts of accelerator B are added in 2-3 times. After all the above-mentioned compounding agents are mixed, the knife is turned over, and the rubber is thinly rolled into 2-3 rolls and 3 triangle packages to produce strips. The thickness of the rubber strip is 10-12mm and the width is 90-100mm. The rubber strip is naturally cooled and used for extrusion and rubber coating; S3, extrusion wrapping and rubber coating: feed the mixed rubber strip in step S2 into a screw extruder to extrude a film with a thickness of 2.0-4.0 mm and a width of 60-70 mm. After the film is uniform, start the rotary rubber coating machine and wrap the rubber strip around the prepared metal roller core. After the roller core is cleaned by sandblasting, apply adhesive, and wrap the rubber layer by layer until the thickness of one side of the rubber coating reaches 15-25 mm. After the rubber coating is completed, wrap 3-4 layers of nylon water cloth on the rubber surface. S4, vulcanization in a vulcanization tank: the rubber roller coated in step S3 is sent into a vulcanization tank, and after the tank door is closed, steam is introduced into the vulcanization tank, and vulcanization is performed by gradually increasing the temperature in a stepwise manner and vulcanizing at low temperature for a long time. While introducing steam, the compressed air valve is opened, and compressed air is introduced to make the pressure in the vulcanization tank reach 5.5-6.0 atmospheres within 0.5 hours; after the vulcanization is completed, the air pressure valve and the steam valve are closed, and the pressure drops. When the pressure gauge pointer points to zero, the safety pin is opened, and the steam discharged from the pin hole floats. The vulcanization tank is half-opened to allow the temperature to drop. When the temperature in the tank is lower than 60°C or equivalent to room temperature, the rubber roller is pulled out; S5, lathing and grinding: the rubber roller naturally cooled to room temperature in step S4 is roughly machined on a lathe, and then finely machined on a CNC grinder until the roller surface roughness reaches 0.8-1.6 μm.

4. The method for preparing the bottom roller rubber of the rewinding machine according to claim 3, characterized in that: In step S3, after applying the adhesive and before wrapping the rubber, a layer of chlorosulfonated polyethylene glue is applied on the metal roller core.