WO2001030898A1

WO2001030898A1 - New industrial process to produce fine rubber powder by normal temperature comminution

Info

Publication number: WO2001030898A1
Application number: PCT/CN2000/000345
Authority: WO
Inventors: Yongfeng He
Original assignee: Yongfeng He
Priority date: 1999-10-27
Filing date: 2000-10-23
Publication date: 2001-05-03
Also published as: CN1251331A; CN1354769A; AU1016101A; CN1125114C

Abstract

The present invention relates to a new industrial process to produce fine rubber powder by comminution at normal temperature from waste tyre or waste rubber articles other than tyre. The present process comprises technical steps of coarse crushing, middle crushing, compounding, fine crushing, at least three times of removing iron, removing fiber and sieving. The present process overcomes the disadvantages of both conventional normal temperature comminution process and low temperature freezing process, and has the advantages of both the two processes described above. Therefore, it is a new industrial process to produce high quality fine rubber powder of 60∩500 meshes, with the characteristics of low investment, low cost, easy operating and being environmental friendly.

Description

New industrialized method for fine rubber powder production at room temperature

The invention relates to a new industrialized method for producing fine rubber powder by pulverizing waste rubber products at room temperature, and in particular, a new industrialized method for producing fine rubber powder by pulverizing waste tires at room temperature. Background technique

At present, there are a large number of waste rubber products (including waste non-tire rubber products and waste tires) every year, especially waste tires. Disposal of a large number of waste rubber products can not only cause pollution to the society and the environment, but also can be recycled. This is The purpose pursued by all countries in the world today. A variety of production methods have been developed, of which the traditional room temperature pulverization method and low temperature freeze pulverization method have attracted attention. The traditional normal temperature crushing method uses secondary rolling to produce rubber powder with a particle size of 0.3 to 1.4 mm (48 mesh-15 mesh). Another type of normal temperature continuous pulverization method (called CTC technology) developed by Kobe Steel in Japan produces coarse rubber powder with the same particle size through two processes: coarse pulverization and fine pulverization. The disadvantage of the above method is that the rubber powder has a large particle size. Can not meet user requirements, low output, high cost, unstable production quality, difficult to adapt to modern industrial production requirements.

Low-temperature freezing and pulverizing methods, such as the low-temperature freezing and pulverizing methods disclosed in US 4,863,106 and US 5,368,040, use liquid nitrogen as a refrigerant, a freezing temperature of -196 ° C, and pulverization by an impact machine to obtain 0.075 ~ 0.30 mm (200 Mesh ~ 48 mesh) fine rubber powder with a fineness of 0.18 ~ 0.22 mm (80 mesh ~ 60 mesh), but this method is expensive equipment, large investment (5 times the normal temperature crushing method), and high production cost ( 5 times the normal temperature method), and it brings a lot of difficulties in startup, production, maintenance, and management. Disclosure of invention

The inventor has been engaged in the research and development of waste rubber products, especially waste rubber tires for a long time, to overcome the shortcomings of the current room temperature pulverization method and low temperature freeze pulverization method, and to have both characteristics, and develop a kind of investment with low cost and low cost. A new industrialized method for easy operation, clean environment and high quality normal temperature crushing to produce fine rubber powder.

The object of the present invention is to provide a new industrialized method for producing fine rubber powder by pulverizing rubber products at room temperature, in particular, a new industrialized method for producing fine rubber powder by pulverizing waste rubber tires at room temperature.

The invention provides a new industrialized method for producing fine rubber powder from waste rubber products, in particular, pulverizing tires at room temperature, including the following steps:

① Rinse the waste rubber products (waste non-tire rubber products and waste rubber tires), store them in different categories and specifications, and then disinfect them.

② If you use waste rubber tires as raw materials, use a turning cutter to remove the thick travellers.

③ Crush the waste tires or waste non-tire rubber products from which the steel wire reeds are cut into Z 2.5cm blocks, and then remove the iron.

④ Crushed, medium crushed, iron removed, fiber removed, and sieved in the step ③ after removing iron. The coarse and medium crushed with XKP-560 double-hook crusher, and the front and back active and passive rollers The inter-torque is adjusted to 0 ~ 50, the linear speed of the front roller is increased by 25% (wt), and the coarse crushing and medium crushing control the temperature Z 85 ° C ~ 100 ° C respectively.

⑤ According to the characteristics of the raw materials, different additives are added, and the additive amount is 1 to 10% (wt) of the rubber powder raw material.

⑥ The above-mentioned steps ⑤ The rubber powder after the ingredients are mixed and homogenized is finely pulverized, iron-removed, fiber-removed, dust-removed, and sieved. The fine pulverization uses a cone vertical pulverizer, and the temperature of the material is adjusted by water cooling or air cooling to Instantaneous temperature Z 70 during fine crushing, feed pellets Diameter Z3 mesh, humidity Z l .5%, preferably Z l.2%, the speed is controlled by a variable speed motor to achieve a discharge particle size of 60-500 mesh.

⑦After fine pulverization, 60 mesh ~ 500 mesh fine rubber powder is obtained and classified.

The invention provides an industrialized method for producing fine rubber powder from waste rubber products, especially waste tires which are crushed at room temperature, and the waste rubber products refer to waste non-tire rubber products, such as tapes, hoses, rubber shoes, wires and cables. , Industrial rubber parts, rubber plates, etc .; the tires include automobile tires (car tires), truck tires, heavy truck tires, tractor tires, and rickshaws. It is well known that tires are made of natural rubber, synthetic rubber such as styrene butadiene rubber, butadiene rubber, isoprene rubber, butyl rubber, ethylene propylene rubber, etc., with various additives, reinforcing steel wires and / or fibers, and vulcanized. Various vehicle tires are different, and the types and ratios of natural rubber and synthetic rubber are also different, and the processing conditions are different. For example, passenger car tires are basically made of synthetic rubber, and truck tires are mainly made of natural rubber. In order to ensure the quality of the fine rubber powder of the product, the production is convenient, and it is suitable for various users' needs for fine rubber powder products. The waste non-tire rubber products and waste tires collected above are removed from the waste rubber products that are oxidized and seriously polluted, which are not suitable for the method of the present invention. Then, it is cleaned to remove dirt and impurities, stacked according to different types and specifications, and then disinfected and stored for future use.

If various waste tires are used as raw materials, the present invention uses a turning cutter to remove the traveller inside the tire. First, the tire is fixed and fed in both directions. The blade is fed into the edge of the steel reed to cut the tread. The steel reed will automatically fall off within a few seconds. , Energy saving.

In the crushing process, the waste tires and / or waste non-tire rubber products from which the travellers have been removed are crushed or cut into Z2.5 cm rubber blocks by using known crushing devices in the prior art, Subsequent iron removal is generally performed using a magnetic iron removal device (steel wire). The crushing step includes coarse crushing, medium crushing, and fine crushing. The coarse crushing and intermediate crushing are, for example, a commercially available XKP-560 double hook crusher, or other known commercially available crushers. In addition to the crushing and shearing functions at room temperature, the twisting function should be enhanced. Therefore, the torque between the active roller (knife, disk, spiral, etc.) and passive roller (knife, disk, spiral, etc.) of the XKP-560 double-hook crusher should be enhanced. Adjusted to 0 ~ 50, preferably 0 ~ 20, more preferably, the size and driving gear of the grinder can be removed so that the torque is 0; the linear speed of the front roller can be increased by 25%, which can make the hook roller wear less, the product size is fine, and the output Double the energy consumption and reduce it by half. In addition, each of the hook rollers is additionally equipped with an 8mm circular screen and a 6mm circular screen and a sealing cover, so as to solve the problem of material return and environment. In order to overcome the problems of thermal degradation during the crushing process of waste tires, high temperature paste, waste of energy consumption, and ensuring product quality, cooling methods such as water cooling and air cooling are used to control the coarse crushing below 85 ° C. Xiamen tires with high synthetic rubber content (such as passenger car tires) can be slightly warmer, such as below 100 ° C, preferably at 20 to 85 ° C or 20 to 100 ° C, and the crushed particle size can reach 3 mesh.

Crushed rubber material after coarse crushing, which contains raw waste tires or non-tired products such as steel wires and fibers in rubber hoses. Steel wires, fibers in tires and rubber are firmly bonded, even when crushed into rubber powder with a particle size of 1mm There are still traces. Therefore, the steel wire and fiber must be removed in time after pulverization. After each crushed powder, the steel wire and fiber must be removed at least three times. The steel wire removal usually uses a magnetic iron removal device. Pay attention to adjusting the material flow. Cyclone separation is used to remove coarse fibers, and fine fibers are adjusted step by step using an air separator. The focus should be on adjusting air flow, wind pressure, temperature, humidity, particle size and other related factors, so as to finally achieve no steel wire, no fiber, and steel wire in fine rubber powder ( Iron), no rubber in the fiber.

Screening should be based on the degree of crushing in different steps, using different separation devices. Generally, the rubber particles below 5 meshes use a circular screen, which has low cost, high yield and easy use. The screening device after coarse crushing and medium crushing generally uses a double-layer circular screen (peripheral) sieve, and after fine crushing, a three-layer circular screen (peripheral) sieve. For example, an air separator is used for 20 to 60 mesh rubber powder. The particle size distribution is narrow. At the same time, a variety of 80-mesh screens are blocked by burr-like fine rubber powder. The mesh cannot be screened. Steel wire or wire, fiber, and dust are conveyed into the warehouse by wind. 8mm rubber material is also sent by air. Among them, finely pulverized and conveyed by negative pressure, others are conveyed by positive pressure. The removed steel wires and fibers are recycled and reused.

In order to ensure uniform product quality and convenient subsequent processing, batching must be performed before fine crushing. According to the characteristics of the raw materials, different types and amounts of additives are allocated. The additive amount is ^: 1 ~ 10% (wt) of the rubber powder raw material. See Table 1 for details. For example, waste car tires use No. 2 additive formula, preferably in the amount of 2 ~ 5% (wt); waste truck tires use No. 1 additive formula, preferably in the amount of 1 ~ 4% (wt), waste truck tires use 1 No. additive formulation, preferably in an amount of 1 to 3% (wt).

The fine pulverization step uses a conical vertical pulverizer to adjust the temperature of the material with water cooling and air cooling. The instantaneous temperature of the rubber material when pulverizing is Z70 ° C, the feed particle size is Z3 mesh, and the humidity is Zl.5% (wt), preferably Z1. 2% (wt), the speed is controlled by a variable speed motor, preferably 500 ~ 750 rpm, so that the feed is not greater than the crushing capacity. Fine pulverization should enhance the grinding function so that the main and passive knives form an incision 0. : 30. The discharge level must have a moderate grinding force so that the particle size of the discharge reaches more than 60 to 500 mesh, and still maintain the physical and chemical properties of the original rubber.

The finely pulverized rubber must go through the above steps of removing iron (steel wire or steel wire), removing fibers, removing dust, and sieving. In the classification process, different grades (mesh numbers) of air separators and circumferential screens are used to perform the classification process, so as to reduce repeated crushing, increase the variety specifications, and classify the mesh without clogging, improve yield and quality, and reduce energy consumption. The fineness of the rubber powder is 0.028mm ~ 0.22mm (150 mesh ~ 60 mesh), which is mainly composed of 0.1mm ~ 0.18mm (150 mesh ~ 80 mesh). It can also be a product grade every 10 mesh according to user needs. The tested quality index of the product is 5% ash content, tensile strength is mpa21.1, and elongation at break is 644%.

The whole production process mentioned above is controlled by the automatic control system. The process flow diagram is shown in Figure 1. Brief description of the drawings

Fig. 1 is a simplified process flow diagram of the method of the present invention. The best way to implement the invention

The following examples further illustrate the present invention, but the protection scope of the present invention is not limited to the listed embodiments, and the protection scope of the present invention is within the protection scope specified in the claims.

Example 1

The cleaned and sterilized 2950Kg / hour waste imported 650 passenger car tires are cut into thick rubber blocks on a crusher after being cut off from their thick travellers, and then iron such as steel wires is removed by a magnetic iron remover for recycling. Then firstly perform coarse and medium crushing on the XKP-560 double-hook crusher. The coarse crushing temperature is controlled at 85 ° C and the medium crushing temperature is controlled at 80 ° C. After crushing, they are passed through iron removal (wire) and fiber removal equipment. As well as the two-layer circular screen, the removed steel wires and fibers are recycled and reused. The unsieved rubber is returned to the coarse and medium crushers and then pulverized. After the secondary crushing and sieving, the fineness of the rubber reaches 3 mesh as fine. Crushed feed rubber.

The above-mentioned feed rubber is mixed in the ingredient mixer with the added No. 2 auxiliary agent (see the formula composition in Table 1) for 59Kg / hour, and the steel wire is removed by the iron removing device.

The compound compounded after the batching step enters the conical vertical grinder for fine crushing. The temperature during crushing is controlled to 70 ° C, and the speed of the variable-speed feed motor is 750 / min. The finely pulverized rubber material is subjected to wire removal, fiber removal, and dust removal in the same manner as in the middle crushing step, and the steel wire is removed and recycled for reuse. The rubber material is then sieved through a three-layer circular screen, or classified. The whole process is continuously produced for 24 hours, and finally 2000Kg / hour fine rubber powder is obtained, of which 60 mesh 20%, 80 mesh 50%, 120 The average power consumption of rubber powder is 586 degrees per ton of rubber powder. The fine powder of the product is 5% ash (wt), the tensile strength is 21mpa, and the elongation at break is 644%. Workshop air level 2 Noise is 55 decibels, no waste water, exhaust gas and dust.

Examples

Example 2 was produced according to the same process steps as in Example 1. The difference was that domestic 650 passenger car waste tires were used as raw materials, and the additive amount was 147.5Kg / hour to obtain a fine rubber powder of 2000Kg / hour. The product quality index was the same as the implementation. Product quality indicators in Example 1.

Example 3

Example 3 was produced according to the same process steps as in Example 1, except that the waste 900 truck tires (made in China) were used as raw materials, and the additive was formulated with No. 1 (table 1 formula). The added amount was 88.5Kg / hour to obtain 2000Kg / hour fine rubber powder, the product quality index is the same as the product quality index in Example 1.

Example 4

Example 4 was produced according to the same process steps as in Example 1, except that the waste silicone scrap was used at 2000 kg / hour, and the traveller was not removed. The additive No. 3 was used, and the additive amount was 10OKg / hour. The product was a silicone fine glue. The powder is 2000Kg / hour, of which 60 mesh 40% and 80 mesh 60%.

Auxiliary formula and amount Raw material name Auxiliary formula% (weight) Amount% (weight) Waste car tire No. 2 auxiliary agent formula: 2 ~ 5

Light calcium carbonate 10-40

Semi-reinforced carbon black 20-50

Dioctyl terephthalate

(DOP) 10-30 Polyvinyl chloride 10 ~ 30

Waste truck tire No. 1 additive formula:

Light calcium carbonate 20 ~ 80

Semi-reinforced carbon black 80 ~ 20

Waste truck wheel No. 1 additive formula: 1 ~ 3 tires

Light calcium carbonate 20 ~ 80

Semi-reinforced carbon black 80 ~ 20

Rubber shoe waste No. 2 additive formula: 3 ~ 10 light calcium carbonate 10-40

Semi-reinforced carbon black 20 ~ 50

Dioctyl terephthalate

(DOP) 10-30

Polyvinyl chloride 10-30

Sports shoe waste No. 2 additive formula: 1 ~ 6 light calcium carbonate 10-40

Semi-reinforced carbon black 20 ~ 50

Dioctyl terephthalate

(DOP) 10-30

Polyvinyl chloride 10 ~ 30

Xia butyl rubber, No. 3 additive formula: 2 ~ 10 silicone rubber

Add water Sodium ¾ 17

Ammonium bicarbonate 7.4

Sodium bicarbonate 7.4

Ammonium nitrate 9.2

Light calcium carbonate 10 ~ 37.5 semi-reinforced carbon black 20.8

~ 48.3 Industrial applicability

Advantages of the new industrialized method for producing fine rubber powder by pulverizing at room temperature according to the present invention For:

1. Low investment, equipment investment is one-half of the traditional room temperature pulverization method, and one-fifth of the low-temperature frozen pulverization method.

2. Industrialized production, simple and flexible, can be closed, stopped, opened, and produced. 3. The production cost is low, which is one fifth of the low-temperature freezing and pulverizing method.

4. Low energy consumption, less labor, 582 degrees of electricity per ton of rubber powder, low temperature freezing method is 900 degrees, fine particle powder method is 1300 degrees; artificial is one-twentieth of normal temperature crushing method, low temperature freezing method Half.

5. The product quality is high, the particle fineness is 0.028mm ~ 0.22mm (150 mesh ~ 60 mesh), mainly 0.1mm ~ 0.18mm (150 mesh ~ 80 mesh).

6. There are many varieties, and the particle size distribution is narrow. According to the needs, 10 varieties can be randomly classified into one grade.

7. High utilization rate, all steel wires and fibers in the tire are used.

8. The production environment is beautiful, the air is level 2, the noise is 55 decibels, and there is no water or dust.

Claims

Rights request

1. An industrialized method for fine rubber powder production at room temperature,

The features of this method include:

① Rinse Xia tire or Xia non tire rubber products, clean them according to different varieties and specifications, and then disinfect them;

② Use a turning cutter to remove the thick travellers of waste tires;

③ Crush the rubber material into Z2.5cm blocks in the above steps, and then remove iron;

④ coarse crushing, medium crushing, iron removing, fiber removing, and sieving of the blocks after the iron removing in step ③, the coarse crushing and medium crushing are performed with an XKP-560 double-hook crusher, and the active rollers of the double-hook crusher and The torque between the passive shafts was adjusted to 0 ~ 50, the linear speed of the front roller increased by 25%, and the crushing temperature was controlled at Z 85 ° C ~ 10CTC;

⑤ According to the characteristics of the original rubber, with different additives, the amount of additives is 1 to 10% (wt) of the original rubber;

⑥ The compound after step ⑤ is mixed and finely pulverized, iron-removed, fiber-removed, dust-removed, and sieved. The fine pulverization uses a conical vertical pulverizer with water-cooled humidity of 1.5% (wt), The output particle size is 60 to 500 mesh;

⑦The above steps ⑥ The fine powder is classified by air separation machine and the circumference to obtain different grades of fine rubber powder.

2. The industrialization method according to claim 1,

It is characterized in that the torque between the active roller and the passive roller of the XKP-560 double-hook crusher for coarse and medium crushing is 0-20.

3. The industrialization method according to claim 1,

The characteristic is that the driving gear of the XKP-560 double-hook crusher for the coarse crushing and intermediate crushing is removed so that the torque is zero.

4. The industrialization method according to claim 1,

It is characterized in that the compounding additive for waste car tires is the No. 2 additive formula: light calcium carbonate 10 ~ 40% (wt), semi-reinforced carbon black 20 ~ 50% (wt), DOP10 ~ 30% (wt ), PVC10-30% (wt); the amount of compounding aid is 2 ~ 5% (wt).

5. The industrialization method according to claim 1,

It is characterized in that the compounding additive for the Xiamen truck tire or the waste truck tire is No. 1 additive formula: light calcium carbonate 20 ~ 80% (wt), semi-reinforced carbon black 80 ~ 20% (wt); Auxiliary additives are 1 to 4% (wt), 1 to 3% (wt).

6. The industrialization method according to claim 1,

It is characterized in that the compounding aid for waste rubber shoes or sports shoes is No. 2 additive formula; light calcium carbonate 20 ~ 80% (wt), semi-reinforcing carbon black 20 ~ 80% (wt); The dosage of the agent is 3 to 10% (wt) and 1 to 6% (wt).

7. The industrialization method according to claim 1,

It is characterized in that the compounding additive for the butyl rubber or silicone rubber is the additive No. 3 formula: 17% (wt) sodium sulfate, 7.4% (wt) ammonium sulfate, 7.4% (wt) sodium sulfate , Ammonium nitrate 9.2% (wt) light carbonic acid Calcium 10-37.5% (wt), semi-reinforcing carbon black 20.8 ~ 48.3% (wt); the amount of compounding aid is 2 ~ 10% (wt).

8. The industrialization method according to claim 1,

It is characterized in that the iron removal and fiber removal are performed at least three times.

9. The industrialization method according to any one of claims 1 to 3,

It is characterized in that each of the pulverizing temperatures is controlled at 20 to 85 X: or 20 to 100 ° C.