A processing technology for crushed rubber and its application

Abstract

The present invention discloses a process for processing rubber scraps, which comprises the following steps: rubber tearing, rubber shredding, and rubber peptization; the device used for rubber tearing is a rubber tearing machine, and the components of the rubber tearing machine include a knife disc; the rubber tearing machine used in the rubber tearing step of the present invention can tear rubber particles into granular rubber with smaller particle size, which can be completely dissolved in a short time in the subsequent rubber sol treatment, and the process steps are simple, the process cycle is short, and the process cost is low. The liquid rubber obtained by the process for processing rubber scraps of the present invention is particularly suitable for the production of liquid coatings and liquid adhesives.

Description

Technical Field

[0001] The present invention relates to the field of rubber, in particular to the field of B29B17 / 00, and more specifically to a processing process for crushed rubber and application thereof. Background Art

[0002] With the development of Chinese society and economic progress, the rubber industry has entered a period of rapid growth. Currently, rubber is widely used in various fields, including military, industry, healthcare, education, electrical appliances, communications, and daily life. The current common crumb rubber processing process consists of three main steps: cutting, shredding, and colloidal dissolution. The cutting step primarily involves using a rubber cutter to slit large blocks of rubber into smaller pieces. However, the resulting rubber is still relatively bulky, and the subsequent crumb and colloidal dissolution processes are complex, requiring a long time to dissolve some of the crumbs, often failing to dissolve them completely. This further limits its application in the production of liquid coatings and adhesives. Liquid adhesives and coatings require completely dissolved liquid rubber for their preparation. Therefore, improving the crumb rubber processing process to achieve a smaller particle size for better application in liquid coatings and adhesives remains a challenging task.

[0003] Patent publication number CN201420327579.8 discloses a bottom-feed rubber shredder. This device not only performs rubber shredding and cleaning functions, but also utilizes the low specific gravity of rubber to achieve top-feed and top-discharge, resulting in high space utilization for the entire device. However, the rubber shredder produces relatively large rubber particles, making further peptization of the rubber particles a complex and costly process. Summary of the Invention

[0004] In order to solve the above problems, the first aspect of the present invention provides a rubber crumb processing process, which at least includes the following steps: rubber tearing, rubber crumbing, and rubber peptization.

[0005] Preferably, the device used for rubber tearing is a rubber tearing machine.

[0006] Preferably, the rubber tearing machine includes the following components: a cutter disc, a feed port, a feed port flange, a reduction gear box, a quick clamp, a belt guard, a motor, a base, a discharge port, and an inspection port.

[0007] Preferably, the rubber tearing process comprises the following steps: putting a whole piece of rubber into a rubber tearing machine, and tearing the whole piece of rubber into small rubber particles by a knife disc.

[0008] Preferably, the cutter disc rotates in the same direction and at the same speed as all gears or in the opposite direction as all adjacent gears.

[0009] Further preferably, the cutter disc rotates in the same direction as all gears.

[0010] Preferably, both sides of the outer surface of the blade disc protrude upward by 20°-40°, and both sides of the inner surface of the blade tip are recessed downward by 20°-40°.

[0011] Further preferably, both sides of the outer surface of the blade disc protrude upward by 30°, and both sides of the inner surface of the blade tip are recessed downward by 30°.

[0012] Preferably, both sides of the cutting edge of the blade tip of the cutter disc are in the shape of an inwardly concave sector, and the curvature of the sector is 10°-40°.

[0013] Further preferably, both sides of the cutting edge of the blade tip of the cutter disc are in the shape of an inwardly concave sector, and the sector curvature is 20°.

[0014] The inventors found that when both sides of the outer surface of the cutter disc protrude upward by 20°-40°, and both sides of the inner surface of the blade tip are concave downward by 20°-40°, and the cutting edges of the blade tip of the cutter disc are both concave fan-shaped, and the fan-shaped curvature is 10°-40°, the rubber can be cut into smaller pieces and the rubber particle size is smaller; the inventors speculate that when the rotating multi-head tool is in this structure, the concave space formed is conducive to tearing the rubber into small particles, and at this time the torque of the blade tip on the rubber is the largest, the blade tip can tear the rubber more effortlessly, and the rubber particle size is also smaller.

[0015] Preferably, the rotation speed of the cutter disc is 100-200 r / min.

[0016] Further preferably, the rotation speed of the cutter disc is 150 r / min.

[0017] Preferably, the peeling time is 30-60 minutes.

[0018] More preferably, the glue tearing time is 45 minutes.

[0019] The inventors found that when the rotation speed of the cutter disc is 100-200r / min, the rubber tearing effect is better; the inventors speculate that when the rotation speed of the cutter disc is lower than 100r / min, the rubber tearing time is too long and the rubber tearing efficiency is low; when the rotation speed of the cutter disc is higher than 200r / min, due to the high rotation speed, it is easy to cause idling, that is, the rubber cannot be torn off, and the high rotation speed is easy to cause wear of the blade tip, affecting the service life of the rubber tearing machine.

[0020] Preferably, the rubber crumbs are granular rubber processed in the rubber tearing step, which is put into a rubber shredder for shredding. The cutting blade of the rubber shredder rotates at a speed of 300-500 r / min to obtain small rubber particles, and the shredding time is 30-60 min.

[0021] Further preferably, the cutting blade of the rubber shredder has a rotation speed of 400 r / min and the rubber shredding time is 30-60 min.

[0022] Preferably, the rubber peptization process is to place the small rubber particles processed in the rubber crumb step in a peptizing agent and stir until they are completely dissolved.

[0023] Preferably, the peptizing agent includes at least one or more of isopropyl alcohol, ethylene glycol, acetone, and p-xylene.

[0024] More preferably, the peptizing agent is p-xylene.

[0025] Preferably, the stirring speed of the rubber peptization is 400 r / min.

[0026] A second aspect of the present invention provides an application of a crumb rubber processing process, which is applied to the production of liquid coatings and liquid adhesives.

[0027] Beneficial effects

[0028] The present invention provides a crumb rubber processing process that differs from conventional crumb rubber processing processes, which primarily include three steps: rubber cutting, rubber shredding, and rubber dissolution. The present invention's crumb rubber processing process includes rubber tearing, rubber shredding, and rubber peptization. The present invention's rubber tearing machine utilizes a blade disc with a specific structure to shred rubber into small, uniform rubber particles. In the subsequent peptization process, the small rubber particles only need to be stirred in a peptizing agent for a short time to completely dissolve them. This reduces the difficulty and cost of crumb rubber processing and shortens the crumb rubber processing cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a cross-sectional view of the glue peeling machine;

[0030] Figure 2 It is a side view of the glue peeling machine;

[0031] Figure 3 This is a top view of the glue peeling machine;

[0032] Figure 4 This is a schematic diagram of the cutter disc of the glue peeling machine;

[0033] Figure 5 Schematic diagram of the cutting tip of the cutter disc;

[0034] Figure 6 The rubber is in the form of granular rubber after the rubber is peeled off using the rubber peeling machine in Example 1.

[0035] Figure 1:1-feed port, 2-feed port flange, 3-reduction gearbox, 4-quick clamp, 5-belt guard, 6-motor, 7-base, 8-discharge port; Figure 2 :9- maintenance port; Figure 3 : 10-Knife disc. DETAILED DESCRIPTION

[0036] Example 1

[0037] This embodiment provides a rubber scraping processing process, comprising the following steps: rubber tearing, rubber scraping, and rubber peptization.

[0038] The rubber peeling machine is used for rubber peeling. It consists of the following components: a cutter disc, feed port, feed port flange, reduction gear, quick clamp, belt guard, motor, base, discharge port, and inspection port. The outer surface of the cutter disc is raised 30° on both sides, while the inner surface of the blade tip is recessed 30° on both sides. The cutting edge of the blade tip is concave on both sides, with a 20° arc.

[0039] The rubber tearing process includes the following steps: putting a 300 kg piece of rubber into the rubber tearing machine, tearing the whole piece of rubber into granular rubber by a knife disc, rotating at a speed of 150 r / min, and tearing time of 45 min.

[0040] The rubber crumbing process comprises the following steps: putting granular rubber into a rubber crusher for crushing, wherein the cutting blade of the rubber crusher rotates at a speed of 400 r / min and the crushing time is 45 minutes to obtain small granular rubber.

[0041] The rubber peptization comprises the following steps: dissolving the small rubber particles in 30 L of peptizing solvent p-xylene (CAS No.: 106-42-3), and stirring at 400 r / min until the rubber is completely dissolved.

[0042] The cross-sectional view of the glue peeling machine is as follows: Figure 1 As shown;

[0043] The side view of the glue peeling machine is as follows Figure 2 As shown;

[0044] The top view of the glue peeling machine is as follows Figure 3 As shown;

[0045] Knife disc Figure 4 As shown;

[0046] The tip of the knife disc is Figure 5 As shown;

[0047] The granular rubber obtained by the rubber tearing process in this embodiment is as follows Figure 6 shown.

[0048] Example 2

[0049] This embodiment provides a rubber scraping processing process, comprising the following steps: rubber tearing, rubber scraping, and rubber peptization.

[0050] The rubber peeling machine is used for rubber peeling. It consists of the following components: a cutter disc, feed port, feed port flange, reduction gear, quick clamp, belt guard, motor, base, discharge port, and inspection port. The outer surface of the cutter disc is raised 30° on both sides, while the inner surface of the blade tip is recessed 30° on both sides. The cutting edge of the blade tip is concave on both sides, with a 20° arc.

[0051] The rubber tearing process includes the following steps: putting a 300 kg block of rubber into the rubber tearing machine, tearing the whole block of rubber into granular rubber by a knife disc, rotating at a speed of 120 r / min, and tearing time of 50 min.

[0052] The rubber crumbing process comprises the following steps: putting granular rubber into a rubber crusher for crushing, wherein the cutting blade of the rubber crusher rotates at a speed of 300 r / min and the crushing time is 50 minutes to obtain small granular rubber.

[0053] The rubber peptization comprises the following steps: dissolving the small rubber particles in 30 L of peptizing solvent p-xylene (CAS No.: 106-42-3), and stirring at 400 r / min until the rubber is completely dissolved.

[0054] Example 3

[0055] This embodiment provides a rubber scraping processing process, comprising the following steps: rubber tearing, rubber scraping, and rubber peptization.

[0056] The rubber peeling machine is used for rubber peeling. It consists of the following components: a cutter disc, feed port, feed port flange, reduction gear, quick clamp, belt guard, motor, base, discharge port, and inspection port. The outer surface of the cutter disc is raised 30° on both sides, while the inner surface of the blade tip is recessed 30° on both sides. The cutting edge of the blade tip is concave on both sides, with a 20° arc.

[0057] The reducer fixing plate assembly is below the cutter disc, the feed hopper flange is connected under the hopper, the hinge assembly is fixed at the edge of the rubber tearing machine chassis, the rubber tearing machine chassis consists of a front door, a side door, and a rear door, which are quickly clamped on the outside of the cutter disc, the frame box assembly is at the bottom of the rubber tearing machine, the frame seat base is above the frame box assembly, the pulley is connected to the gearbox, there is a rubber belt on the pulley, the cutter disc is connected to the pulley, and there are 10 rotating gears on the cutter disc.

[0058] The rubber tearing process includes the following steps: putting a 300 kg piece of rubber into the rubber tearing machine, tearing the whole piece of rubber into granular rubber by a knife disc, rotating at a speed of 180 r / min, and tearing time of 40 min.

[0059] The rubber crumbing process comprises the following steps: putting granular rubber into a rubber crusher for crushing, wherein the cutting blade of the rubber crusher rotates at a speed of 500 r / min and the crushing time is 40 minutes to obtain small granular rubber.

[0060] The rubber peptization comprises the following steps: dissolving the small rubber particles in 30 L of peptizing solvent p-xylene (CAS No.: 106-42-3), and stirring at 400 r / min until the rubber is completely dissolved.

[0061] Comparative Example 1

[0062] This comparative example provides a rubber scrap processing process, comprising the following steps: rubber tearing, rubber scraping, and rubber peptization.

[0063] The rubber peeling machine is used for rubber peeling. It consists of the following components: a cutter disc, feed port, feed port flange, reduction gear, quick clamp, belt guard, motor, base, discharge port, and inspection port. The outer surface of the cutter disc is raised 30° on both sides, while the inner surface of the blade tip is recessed 30° on both sides. The cutting edge of the blade tip is concave on both sides, with a 20° arc.

[0064] The rubber tearing process includes the following steps: putting a 300 kg block of rubber into the rubber tearing machine, tearing the whole block of rubber into granular rubber by a knife disc, rotating at a speed of 60 r / min, and tearing time of 55 min.

[0065] The rubber crumbing process comprises the following steps: putting granular rubber into a rubber crusher for crushing, wherein the cutting blade of the rubber crusher rotates at a speed of 400 r / min and the crushing time is 45 minutes to obtain small granular rubber.

[0066] The rubber peptization comprises the following steps: dissolving the small rubber particles in 30 L of peptizing solvent p-xylene (CAS No.: 106-42-3), and stirring at 400 r / min until the rubber is completely dissolved.

[0067] Comparative Example 2

[0068] This comparative example provides a rubber scrap processing process, comprising the following steps: rubber tearing, rubber scraping, and rubber peptization.

[0069] The rubber peeling machine is used for rubber peeling. It consists of the following components: a cutter disc, feed port, feed port flange, reduction gear, quick clamp, belt guard, motor, base, discharge port, and inspection port. The outer surface of the cutter disc is raised 30° on both sides, while the inner surface of the blade tip is recessed 30° on both sides. The cutting edge of the blade tip is concave on both sides, with a 20° arc.

[0070] The rubber tearing process includes the following steps: putting a 300 kg piece of rubber into the rubber tearing machine, tearing the whole piece of rubber into granular rubber by a knife disc, rotating at a speed of 150 r / min, and tearing time of 45 min.

[0071] The rubber crumbing process comprises the following steps: putting granular rubber into a rubber crusher for crushing, wherein the cutting blade of the rubber crusher rotates at a speed of 100 r / min and the crushing time is 60 minutes to obtain small granular rubber.

[0072] The rubber peptization comprises the following steps: dissolving the small rubber particles in 30 L of peptizing solvent p-xylene (CAS No.: 106-42-3), and stirring at 400 r / min until the rubber is completely dissolved.

[0073] Performance Testing

[0074] The time for rubber peptization is roughly proportional to the particle size of the rubber. The shorter the peptization time, the smaller the rubber particle size; the smaller the rubber, the better the effect of rubber tearing and shredding.

[0075] The particle size of the rubber after the peeling treatment, the melting time and the temperature reached by the rubber peptization in Examples 1-3 and Comparative Examples 1-2 were recorded and entered into Table 1.

[0076] Table 1

[0077] Particle size (cm) Melting time (h) Temperature reached when completely melted (℃) Example 1 0.4 3.0 40 Example 2 0.5 3.5 45 Example 3 0.5 3.0 45 Comparative Example 1 0.8 5.0 65 Comparative Example 2 1.1 6.5 70

[0078] It can be seen from the results of Examples 1 to 3, Comparative Examples 1 to 2 and Table 1 that the process for processing rubber crumbs provided by the present invention can efficiently process rubber, the rubber particles obtained by tearing the rubber are small, the rubber peptization time is short, and the process steps are simple, the process cost is low, and the process cycle is short. It is particularly suitable for the production of liquid adhesives and liquid coatings.

Claims

1. A process for processing rubber crumbs, characterized in that: The following steps are involved: Rubber tearing, rubber shredding, rubber peptization; The device used for rubber tearing is a rubber tearing machine; the components of the rubber tearing machine include a feed port (1), a feed port flange (2), a reduction box (3), a quick clamp (4), a belt guard (5), a motor (6), a base (7), a discharge port (8), an inspection port (9), and a cutter head (10); The gear rotation direction of the cutter disc (10) is such that all gears rotate in the same direction and at the same speed or all adjacent gears rotate in opposite directions and at the same speed. Both sides of the outer surface of the cutter disc (10) protrude upward by 20°-40°, and both sides of the inner surface of the blade tip are concave downward by 20°-40°. The cutting edge of the blade tip of the cutter disc (10) is in the shape of a concave sector, and the arc of the sector is 10°-40°. The rubber tearing process comprises the following steps: putting a whole piece of rubber into a rubber tearing machine, tearing the whole piece of rubber into small rubber particles by a knife disc (10), and the rotation speed of the knife disc is 100-200 r / min; The rubber crumbs are granular rubbers processed in the rubber tearing step, which are put into a rubber shredder for shredding. The cutting blade of the rubber shredder rotates at a speed of 300-500 r / min to obtain small rubber particles. The shredding time is 30-60 minutes. The rubber peptization step comprises placing the rubber particles processed by the rubber tearing and rubber shredding steps into a peptizing agent and stirring until the rubber particles are completely melted.

2. The process for processing rubber crumbs according to claim 1, characterized in that: The peptizing agent at least includes one or more of isopropyl alcohol, ethylene glycol, acetone and p-xylene.

3. An application of a crumb rubber processing process according to any one of claims 1-2, characterized in that: Used in the production of liquid coatings and liquid adhesives.

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