Surface treatment method and system for bonding thermoplastic polyolefin and polyurethane

Abstract

The invention discloses a surface treatment method for bonding thermoplastic polyolefin and polyurethane. The surface treatment method comprises the following steps: step 1, cleaning a bonding surface of a thermoplastic polyolefin plate; 2, the bonding face of the thermoplastic polyolefin plate is treated through a plasma surface treatment machine, and the adhesive force of the bonding face to glue is increased; and step 3, brushing glue on the bonding surface of the polyurethane foam board. The invention further discloses a surface treatment system for bonding the thermoplastic polyolefin and the polyurethane. In the process of compounding the polyurethane foam material and the thermoplastic polyolefin material, the surface of the thermoplastic polyolefin material is treated by adopting a plasma surface treatment machine, and a large number of irregular pits are generated on the surface subjected to plasma treatment and are rough, so that the adhesive force between the surface and glue is enhanced to a great extent; furthermore, after sufficient pressing operation, the adhesive strength between the adhesive and polyurethane foam can be effectively enhanced, so that the peel strength and tensile strength required in site construction can be met.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal insulation materials and relates to a surface treatment method and system for bonding thermoplastic polyolefin and polyurethane. Background Art

[0002] Polyurethane foam materials are widely used in thermal insulation in industrial fields such as construction, transportation, petroleum, chemical industry, electricity, refrigeration, etc., especially in scenarios where thermal insulation is needed for liquefied gas cryogenic storage tanks or liquefied gas transport ships.

[0003] Polyurethane foam materials are relatively fragile, and direct exposure in application scenarios will cause their service life to be drastically shortened. Therefore, external protection needs to be added during construction layout. Thermoplastic polyolefin waterproof membranes are a new type of waterproof membrane made of resin, ethylene, acetic acid, and vinyl resin as the base materials, with the addition of antioxidants, anti-aging agents, and softeners, and with fabric fibers and aluminum film attached to the surface. Their excellent performance makes them very suitable as external protection for polyurethane foam materials. Due to the requirements of installation and construction, it is usually necessary to compound polyurethane foam and thermoplastic polyolefin and then install and construct them uniformly. However, the surface characteristics of thermoplastic polyolefins result in insufficient adhesion to glue, resulting in the bonding strength with polyurethane foam not being able to meet the peel strength and tensile strength requirements required for on-site construction. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a surface treatment method and system for bonding thermoplastic polyolefin and polyurethane.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A surface treatment method for bonding thermoplastic polyolefin and polyurethane comprises the following steps:

[0007] Step 1: Clean the bonding surface of the thermoplastic polyolefin sheet;

[0008] Step 2: Treat the bonding surface of the thermoplastic polyolefin sheet with a plasma surface treatment machine to increase the adhesion of the bonding surface to the glue;

[0009] Step 3: Apply glue to the adhesive surface of the polyurethane foam board;

[0010] Step 4: Compound the adhesive surface of the thermoplastic polyolefin sheet and the adhesive surface of the polyurethane foam sheet opposite to each other, and place them in a press for pressing;

[0011] Step 5: After the pressing work is completed, take it out and let it stand.

[0012] Furthermore, in step 1, the adhesive surface of the thermoplastic polyolefin plate is cleaned and then covered with a plastic film.

[0013] Furthermore, in step 2, the adhesive surface of the thermoplastic polyolefin plate is covered with a plastic film after being treated by a plasma surface treatment machine.

[0014] Furthermore, the power range of the plasma surface treatment machine is 300-2000w, the nozzle treatment diameter is 10-80mm, the height of the nozzle of the plasma surface treatment machine from the bonding surface of the thermoplastic polyolefin plate is 5-50mm, and the maximum lateral translation speed of the nozzle is 0.5m / s.

[0015] Furthermore, in step 3, the amount of glue used is 200-800g / ㎡.

[0016] Furthermore, in step 3, protective tape is applied to the non-glue-coated area of ​​the polyurethane foam board.

[0017] Furthermore, in step 4, during the pressing operation of the press, the pressure value is selected in the range of 0.05-0.15 MPa, and the pressing time is selected in the range of 45 min-8 h.

[0018] Furthermore, in step 4, before the press is pressed, the outer surface of the thermoplastic polyolefin plate is covered with a plastic film.

[0019] A surface treatment system for bonding thermoplastic polyolefin and polyurethane, used for executing the above-mentioned surface treatment method for bonding thermoplastic polyolefin and polyurethane, comprises a purging device, a plasma surface treatment device and a press, wherein the purging device comprises an air pump and an air gun head, the plasma surface treatment device comprises a platform and a plasma surface treatment machine, the surface of the platform forms a plane for horizontally placing a thermoplastic polyolefin plate, the plasma surface treatment machine comprises a nozzle, and the nozzle is connected to the platform through a multi-axis mechanical arm and arranged above the platform.

[0020] In summary, the present invention is beneficial in that:

[0021] In the process of compounding the polyurethane foam material and the thermoplastic polyolefin material, the surface of the thermoplastic polyolefin material is treated with a plasma surface treatment machine. A large number of irregular pits are generated on the surface after the plasma treatment, making it rough, thereby greatly enhancing the adhesion with the glue. Furthermore, after sufficient pressing operation, the bonding strength between the surface and the polyurethane foam can be effectively enhanced to meet the peeling strength and tensile strength required in on-site construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a flowchart of the surface treatment method for bonding thermoplastic polyolefin and polyurethane. DETAILED DESCRIPTION

[0023] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0024] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0025] All directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, horizontal, vertical...) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0026] Due to installation errors and other reasons, the parallel relationship referred to in the embodiments of the present invention may actually be an approximately parallel relationship, and the vertical relationship may actually be an approximately vertical relationship.

[0027] The invention provides a surface treatment system for bonding thermoplastic polyolefin and polyurethane, which is mainly used for preparing composite insulating and heat-insulating boards used in the liquefied gas containment system industry of LNG / LEG / LPG.

[0028] The composite insulation board is composited with a polyurethane foam board and a thermoplastic polyolefin board.

[0029] The polyurethane foam board is produced by online mixing and continuous foaming of multi-component raw materials, and is suitable for thermal insulation in industrial fields such as construction, transportation, petroleum, chemical industry, electricity, refrigeration, etc., especially in scenarios where thermal insulation is required for liquefied gas cryogenic storage tanks or liquefied gas transport ships.

[0030] Among them, thermoplastic polyolefin waterproof membrane is a new type of waterproof membrane made of resin, ethylene, acetic acid, and vinyl resin as the base material, with the addition of antioxidants, anti-aging agents, and softeners, and with fabric fibers and aluminum film attached to the surface. The physical property test of the material meets the requirements of "Polymer Waterproof Materials" (GB18173-2000). It combines the performance of EPDM and PVC, has excellent aging resistance, can be exposed to the sun for a long time, has a long service life, strong puncture resistance, good low-temperature flexibility, strong adaptability to environmental temperature differences, a wide range of uses, and excellent environmental protection performance. Therefore, it can be used as the outer layer protection of the polyurethane foam board to protect the stability of the polyurethane foam board.

[0031] The polyurethane foam board and the thermoplastic polyolefin board in this embodiment are compounded by gluing. Usually, the surface of the thermoplastic polyolefin board is smooth, and the adhesion between the glue and its surface is not sufficient to meet the peel strength and tensile strength required for on-site construction. Therefore, further, the surface treatment system for bonding the thermoplastic polyolefin and the polyurethane also includes a purge device, a plasma surface treatment device, and a press.

[0032] The plasma surface treatment equipment includes a platform and a plasma surface treatment machine. The surface of the platform forms a plane for horizontally placing the thermoplastic polyolefin plate. A plurality of limiting structures are arranged on the surface of the platform to limit the position of the thermoplastic polyolefin plate to avoid lateral movement. The limiting structures include but are not limited to limiting blocks protruding from the surface of the platform, clamps arranged on the surface of the platform, etc.

[0033] The plasma surface treatment machine is arranged close to the platform and comprises a nozzle. The nozzle is arranged above the platform through a multi-axis mechanical arm and can realize multi-directional movement through the multi-axis mechanical arm.

[0034] The purging device comprises an air pump and an air gun head, which generates compressed air to purge the surface of the thermoplastic polyolefin plate so as to remove stains such as dust and liquid on the surface before plasma treatment.

[0035] The present invention also provides a surface treatment method for bonding thermoplastic polyolefin and polyurethane. The surface treatment system for bonding thermoplastic polyolefin and polyurethane uses the method to implement a composite operation of a polyurethane foam board and a thermoplastic polyolefin board. The method comprises the following steps:

[0036] Step 1: Clean the bonding surface of the thermoplastic polyolefin sheet;

[0037] Use compressed air to blow the surface of the thermoplastic polyolefin board for bonding. If necessary, use a clean rag to clean it manually. During the operation, the operator should wear gloves to prevent contamination of the surface.

[0038] Furthermore, after the cleaning process is completed, the surface of the thermoplastic polyolefin plate is covered with a plastic film to prevent secondary contamination and ensure the cleanliness of the bonding surface before the plasma treatment operation.

[0039] Step 2: Treat the bonding surface with a plasma surface treatment machine to increase the adhesion of the bonding surface to the glue;

[0040] A thermoplastic polyolefin plate of corresponding size is placed on the platform, and a nozzle of a plasma surface treatment machine is driven by a mechanical arm to perform jet plasma treatment on the bonding surface of the thermoplastic polyolefin plate. Preferably, the relevant parameters of the plasma surface treatment machine are set as follows: the power range is 300-2000w, the nozzle treatment diameter is 10-80mm, the height of the nozzle from the bonding surface is 5-50mm, and the maximum speed of the nozzle lateral translation is 0.5m / s;

[0041] The plasma surface treatment machine uses compressed air to spray plasma onto the bonding surface, causing the surface of the thermoplastic polyolefin plate to undergo a variety of physical and chemical changes, such as etching and roughening, or forming a dense cross-linked layer, which improves its hydrophilicity, adhesion, dyeability, biocompatibility and electrical properties, and changes the surface from non-polar and difficult to adhere to a certain polarity, easy to adhere and hydrophilic, greatly increasing its surface adhesion to the glue;

[0042] Furthermore, after the bonding surface is processed, the bonding surface of the thermoplastic polyolefin plate is covered with a plastic film again and placed in the area to be processed.

[0043] Step 3: Apply glue evenly on the bonding surface;

[0044] The glue is applied on the adhesive surface of the polyurethane foam board according to the requirements of the corresponding technical specifications of the glue. Preferably, the amount of glue used is 200-800g / ㎡;

[0045] Furthermore, in order to avoid contaminating the non-glue-coated area during the glue application process, a protective tape is pasted on the non-glue-coated area of ​​the polyurethane foam board before the application work, and is removed after the pressing work is completed. The protective tape is made of polyethylene and other materials commonly used on the market.

[0046] Step 4: Compounding the thermoplastic polyolefin sheet and the polyurethane foam sheet, and pressing them by a press machine;

[0047] The bonding surface of the thermoplastic polyolefin board and the bonding surface of the polyurethane foam board are aligned to form a composite, the composite product is placed in a press, and the press is started to perform a pressing operation. Preferably, the pressure value is selected in the range of 0.05-0.15 MPa, and the pressing time is selected in the range of 45 min-8 h (the specific time can be adjusted according to the curing time of the glue). During the pressing operation, it is observed that the glue overflows from the area outside the bonding surface, which can prove that the amount of glue applied meets the requirements;

[0048] Furthermore, before the press machine performs the pressing operation, the outer surface of the thermoplastic polyolefin plate is covered with a plastic film for protection to prevent the press machine from causing damage to the outer surface of the thermoplastic polyolefin plate.

[0049] Step 5:

[0050] After the pressing operation is completed, the product is removed and a professional quality inspector performs the corresponding quality inspection. After the quality inspection is qualified, the product is placed in the qualified area and allowed to stand. Preferably, the standing time is 2-3 hours.

[0051] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

Claims

1. A surface treatment method for bonding thermoplastic polyolefin and polyurethane, characterized in that: The following steps are involved: Step 1: Clean the bonding surface of the thermoplastic polyolefin sheet; Step 2: Treat the bonding surface of the thermoplastic polyolefin sheet with a plasma surface treatment machine to increase the adhesion of the bonding surface to the glue; Step 3: Apply glue to the adhesive surface of the polyurethane foam board; Step 4: Compound the adhesive surface of the thermoplastic polyolefin sheet and the adhesive surface of the polyurethane foam sheet opposite to each other, and place them in a press for pressing; Step 5: After the pressing work is completed, take it out and let it stand.

2. A surface treatment method for bonding thermoplastic polyolefin and polyurethane according to claim 1, characterized in that: In step 1, the adhesive surface of the thermoplastic polyolefin plate is cleaned and then covered with a plastic film.

3. The surface treatment method for bonding thermoplastic polyolefin and polyurethane according to claim 1, characterized in that: In step 2, the adhesive surface of the thermoplastic polyolefin plate is treated by a plasma surface treatment machine and then covered with a plastic film.

4. The surface treatment method for bonding thermoplastic polyolefin and polyurethane according to claim 1, characterized in that: The power range of the plasma surface treatment machine is 300-2000w, the nozzle treatment diameter is 10-80mm, the height of the nozzle of the plasma surface treatment machine from the bonding surface of the thermoplastic polyolefin plate is 5-50mm, and the maximum lateral translation speed of the nozzle is 0.5m / s.

5. The surface treatment method for bonding thermoplastic polyolefin and polyurethane according to claim 1, characterized in that: In step 3, the amount of glue used is 200-800g / ㎡.

6. The surface treatment method for bonding thermoplastic polyolefin and polyurethane according to claim 1, characterized in that: In step 3, protective tape is applied to the non-glue-coated areas of the polyurethane foam board.

7. The surface treatment method for bonding thermoplastic polyolefin and polyurethane according to claim 1, characterized in that: In step 4, during the pressing operation of the press, the pressure value is selected in the range of 0.05-0.15 MPa, and the pressing time is selected in the range of 45 min-8 h.

8. The surface treatment method for bonding thermoplastic polyolefin and polyurethane according to claim 1, characterized in that: In step 4, before the press is pressed, the outer surface of the thermoplastic polyolefin plate is covered with a plastic film.

9. A surface treatment system for bonding thermoplastic polyolefin and polyurethane, used for performing the surface treatment method for bonding thermoplastic polyolefin and polyurethane as claimed in any one of claims 1 to 8, characterized in that: The invention comprises a purging device, a plasma surface treatment device and a press, wherein the purging device comprises an air pump and an air gun head, the plasma surface treatment device comprises a platform and a plasma surface treatment machine, the surface of the platform forms a plane for horizontally placing a thermoplastic polyolefin plate, and the plasma surface treatment machine comprises a nozzle, which is connected to the platform through a multi-axis mechanical arm.

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