Lossless stripping method for nonmetal attachments on metal surface

Abstract

The invention belongs to the technical field of waste recovery, and discloses a nondestructive stripping method for non-metal attachments on a metal surface. The nondestructive stripping method comprises the following steps: S1, detecting and judging the material, thickness and strength of a metal base material, the components, thickness and adhesive force of a non-metal layer, and the components of a bonding layer between the base material and the non-metal layer; s2, according to the characteristics of metal and nonmetal, the most appropriate heating mode is selected, and corresponding heating equipment is prepared; s3, preheating; s4, heating to sufficiently soften a bonding substance between the non-metal layer and the metal base material; and S5, stripping: separating the non-metal layer from the metal base layer by applying an external force. The bonding layer between the metal base material and the non-metal layer is melted and damaged by means of heating, the bonding layer can be damaged by utilizing the expansion coefficient difference of metal and non-metal, after heating is conducted for a certain time, the non-metal layer can be easily stripped from the metal base material through external force, combustion is avoided, and environment friendliness is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of waste recycling, and in particular relates to a method for non-destructive stripping of non-metallic attachments on a metal surface. Background Art

[0002] In the fields of engineering machinery, transportation, machine tools and equipment, a large number of metal-rubber composite products are used. These components are all made by vulcanizing rubber on metal frames with adhesives. Metal can reinforce, strengthen and frame rubber, while rubber makes metal wear-resistant, shock-absorbing, impact-resistant, corrosion-resistant, insulating and sealing. Due to damage, expiration of service life, poor manufacturing and other reasons, this type of product generates a large amount of waste every year. Since there is no economical and efficient way to separate metal from rubber, metal and rubber materials cannot be directly reused. At present, most of these accessories are sold at low prices as hazardous waste, and buyers also obtain the metal frames by incineration for recycling. According to the current incineration method, the incineration of waste rubber products of this type of accessories will produce a large amount of harmful sulfur-containing gases, which will have a serious impact on air quality. Summary of the invention

[0003] In order to overcome the above technical problems, the present invention provides a non-destructive stripping method for non-metallic attachments on metal surfaces, which separates the metal base layer and the non-metallic attachment layer by heating without burning, and is safe and green.

[0004] The present invention adopts the following technical solutions:

[0005] A non-destructive stripping method for non-metallic attachments on a metal surface, comprising the following steps:

[0006] S1. Detect and determine the material, thickness, strength of the metal substrate, the composition, thickness and adhesion of the non-metallic layer, and the composition of the bonding layer between the substrate and the non-metallic layer;

[0007] S2. According to the characteristics of metals and non-metals, select the most appropriate heating method and prepare the corresponding heating equipment;

[0008] S3. Preheating: Start heating at a lower temperature to gradually heat up the metal and non-metal layers;

[0009] S4. Heating: The heating temperature is set between 300-350 degrees Celsius to fully soften the bonding material between the non-metallic layer and the metal substrate;

[0010] S5. Peeling: The non-metallic layer falls off spontaneously or is separated from the metal base layer by applying external force.

[0011] Preferably, for metal substrates with good electrical conductivity, electromagnetic induction heating is selected; for metal substrates with large or complex shapes, thermal radiation heating is selected.

[0012] Preferably, ensure that the operation is performed in a well-ventilated area and avoid flammable and explosive items approaching the work area.

[0013] Preferably, nitrogen is supplied to the heating area during heating to prevent the non-metallic layer from catching fire and burning.

[0014] Preferably, the external force peeling is started with a scraper, and the non-metallic layer is peeled off using a pulling device.

[0015] Preferably, waste gas purification equipment is used to absorb and purify waste gas generated during heating and stripping.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention melts and destroys the bonding layer between the metal substrate and the non-metal layer by means of heating, and can utilize the difference in expansion coefficients between the metal and the non-metal to destroy the bonding layer. After heating for a certain period of time, the non-metal layer can be easily peeled off from the metal substrate by using external force, thus avoiding burning and being environmentally friendly. DETAILED DESCRIPTION

[0018] The embodiments of the present invention are described in detail below. Unless otherwise specified, the raw materials and equipment used can be purchased from the market or are commonly used in the art. The methods in the embodiments, unless otherwise specified, are conventional methods in the art. The following embodiments are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0019] A non-destructive stripping method for non-metallic attachments on a metal surface, comprising the following steps:

[0020] S1. Detect and determine the material, thickness, strength of the metal substrate, the composition, thickness and adhesion of the non-metallic layer, and the composition of the bonding layer between the substrate and the non-metallic layer;

[0021] S2. Choose the most appropriate heating method according to the characteristics of metal and non-metal. For metal substrates with good conductivity, choose electromagnetic induction heating; for large or complex metal substrates, choose thermal radiation heating and prepare corresponding heating equipment;

[0022] S3. Preheating: Start heating at a lower temperature to gradually heat up the metal and non-metal layers;

[0023] S4. Heating: Set the heating temperature between 300-350 degrees Celsius, and maintain it for 20-30 seconds after the whole reaches the set temperature, so that the adhesive between the non-metallic layer and the metal substrate is fully softened. During heating, nitrogen is supplied to the heating area to prevent the non-metallic layer from catching fire and reducing the generation of sulfur dioxide after the rubber is heated;

[0024] During the heating process, the adhesive may volatilize some harmful substances. Use exhaust gas purification equipment to absorb and purify the exhaust gas generated during heating and peeling.

[0025] S5. Peeling: The non-metallic layer falls off spontaneously, starting with a scraper, and then an external force is applied by a pulling device to separate the non-metallic layer from the metal base.

[0026] The entire process should be carried out in a well-ventilated area to avoid flammable and explosive items approaching the work area.

[0027] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the above embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A non-destructive stripping method for non-metallic attachments on metal surfaces. It is characterized in that Includes the following: S1. Detect and determine the material, thickness, strength of the metal substrate, the composition, thickness and adhesion of the non-metallic layer, and the composition of the bonding layer between the substrate and the non-metallic layer; S2. According to the characteristics of metals and non-metals, select the most appropriate heating method and prepare the corresponding heating equipment; S3. Preheating: Start heating at a lower temperature to gradually heat up the metal and non-metal layers; S4. Heating: The heating temperature is set between 300-350 degrees Celsius to fully soften the bonding material between the non-metallic layer and the metal substrate; S5. Peeling: The non-metallic layer falls off spontaneously or is separated from the metal base layer by applying external force.

2. A non-destructive stripping method for non-metallic attachments on a metal surface according to claim 1, It is characterized in that For metal substrates with good conductivity, electromagnetic induction heating is selected; for metal substrates with large or complex shapes, thermal radiation heating is selected.

3. A non-destructive stripping method for non-metallic attachments on a metal surface according to claim 1, It is characterized in that Ensure that the operation is carried out in a well-ventilated area and avoid flammable and explosive items near the work area.

4. The method for non-destructive stripping of non-metallic attachments on a metal surface according to claim 1, It is characterized in that When heating, nitrogen is supplied to the heating area to prevent the non-metallic layer from catching fire.

5. The method for non-destructive stripping of non-metallic attachments on a metal surface according to claim 1, It is characterized in that When external force peeling is performed, a scraper is used to start, and the non-metallic layer is peeled off using a traction device.

6. The method for non-destructive stripping of non-metallic attachments on a metal surface according to claim 1, It is characterized in that Use exhaust gas purification equipment to absorb and purify the exhaust gas generated during heating and stripping.