Preparation method of high-toughness high-temperature-resistant POE (Polyolefin Elastomer) type carbon cloth composite adhesive

Abstract

The invention relates to a preparation method of a high-toughness high-temperature-resistant POE (Polyolefin Elastomer) carbon cloth composite adhesive. The preparation method comprises the following steps: (1) adding mineral oil, polyisobutene and an antioxidant into a reaction kettle, heating to 140-160 DEG C, stirring at the rotating speed of 20-30 revolutions per minute until all the materials are molten, and keeping the temperature constant; (2) adding metallocene polypropylene and random polyolefin, dissolving the metallocene polypropylene and the random polyolefin one by one, stirring at the rotating speed of 20-50 revolutions per minute until the metallocene polypropylene and the random polyolefin are completely molten, and keeping the temperature at 160-180 DEG And (3) adding the hydrogenated tackifying resin, reducing the stirring rotating speed to 10-30 revolutions per minute, and introducing the mixture into a screw extruder for extrusion and granulation after the mixture is fully and uniformly stirred, so as to prepare a finished product of the high-toughness high-temperature-resistant POE type carbon cloth composite adhesive. The environment-friendly POE type carbon cloth composite adhesive with high toughness and high temperature resistance is prepared.

Description

Technical Field

[0001] The present invention relates to a method for preparing a carbon cloth composite adhesive, in particular to a method for preparing a high-toughness and high-temperature-resistant POE carbon cloth composite adhesive. Background Art

[0002] Existing carbon cloth composites for air filters mostly use traditional solvent-based adhesives or TPR hot melt adhesives with a softening point below 90°C. These adhesives have high VOC emissions and are not environmentally friendly, failing to meet the requirements of new energy vehicles and industrial air purification. With the surge in demand for new energy vehicles and industrial filtration equipment, the market for carbon cloth composites for air filters is expected to grow by over 15% annually, creating an urgent need for high-performance, environmentally friendly adhesives. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a method for preparing an environmentally friendly, high-toughness, high-temperature-resistant POE carbon cloth composite adhesive.

[0004] The technical solution adopted by the present invention to solve the above problems is: a method for preparing the high-toughness and high-temperature resistant POE carbon cloth composite adhesive, which is characterized by the following steps:

[0005] (1) Add mineral oil, polyisobutylene and antioxidant to the reactor, heat to 140°C to 160°C and stir at a stirring speed of 20 to 30 revolutions per minute until all are melted and the temperature is constant; mineral oil and polyisobutylene are used as viscosity and open time regulators to achieve good fluidity and dispersibility; a small amount of high-quality antioxidant can slow down the aging of the material during the heating process and increase the life of the finished product during normal use;

[0006] (2) Add metallocene polypropylene and random polyolefin, dissolve them one by one, stir at a speed of 20 to 50 revolutions per minute, until they are completely melted and kept at a constant temperature of 160°C to 180°C; metallocene polypropylene has good flexibility and low temperature resistance, random polyolefin has good surface wettability and ductility, and has good compatibility with oils and resins;

[0007] (3) Add hydrogenated tackifying resin, reduce the stirring speed to 10-30 rpm, and after being fully stirred, introduce the mixture into a screw extruder for extrusion and granulation to obtain a high-toughness, high-temperature resistant POE carbon cloth composite adhesive product. Hydrogenated tackifying resin, as a tackifier, effectively improves the product's bonding performance, aging resistance, and yellowing resistance.

[0008] Preferably, the mineral oil used in step (1) of the present invention is 10 to 15 parts, polyisobutylene is 2 to 5 parts, and antioxidant is 0.3 to 1 part; the metallocene polypropylene used in step (2) is 5 to 10 parts, and random polyolefin is 30 to 40 parts; and the hydrogenated tackifying resin used in step (3) is 30 to 40 parts.

[0009] Preferably, in step (1) of the present invention, mineral oil, polyisobutylene and antioxidant are added sequentially.

[0010] Preferably, in step (2) of the present invention, the metallocene polypropylene is added first, and after it is dissolved, the random polyolefin is added.

[0011] Compared with the existing technology, the present invention has the following advantages and effects: focusing on the application of hot melt adhesive in the composite of carbon fiber filter materials, solving the problems of environmental protection and insufficient durability of traditional adhesives. Providing high-performance, low-cost solutions for the fields of new energy vehicle air-conditioning filter elements, industrial air purifiers, medical protective equipment, etc. An innovative formula is adopted, and the formula ratio is boldly changed to reduce the proportion of a part of the main polymer and increase the proportion of mineral oil to improve low-temperature resistance. The hot melt adhesive formula is optimized to control the melt index, viscosity, softening point, high and low temperature resistance, etc. The present invention develops an environmentally friendly hot melt adhesive to replace traditional adhesives, reduce the risk of environmental pollution, improve product performance, meet the composite needs of air filter carbon cloth, achieve controllable melting temperature, high bonding strength, and excellent temperature resistance, and can be used normally at a stable temperature of -40°C to 120°C. DETAILED DESCRIPTION

[0012] The present invention will be further described in detail below by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0013] Example

[0014] The steps of the preparation method of the high-toughness and high-temperature-resistant POE carbon cloth composite adhesive in this embodiment are as follows:

[0015] (1) Add mineral oil, polyisobutylene and antioxidant to the reactor. Mineral oil, polyisobutylene and antioxidant are added sequentially, and the temperature is raised to 140-160°C and stirred at a stirring speed of 20-30 rpm until all are melted and the temperature is constant. The mineral oil used is 10-15 parts, polyisobutylene is 2-5 parts, and antioxidant is 0.3-1 part. Mineral oil and polyisobutylene are used as viscosity and open time regulators to improve fluidity and dispersibility. A small amount of high-quality antioxidant can slow down the aging of the material during the heating process and increase the life of the finished product in normal use. The antioxidant can be 1010 hindered phenol antioxidant, 168 organic phosphite antioxidant, 3114 trifunctional hindered phenol antioxidant, or 626 high-temperature resistant organic phosphite antioxidant.

[0016] (2) Add metallocene polypropylene and random polyolefin, using 5-10 parts of metallocene polypropylene and 30-40 parts of random polyolefin; add metallocene polypropylene first, wait for it to dissolve, then add random polyolefin. After each dissolution, stir at 20-50 rpm until all are melted and kept at a constant temperature of 160-180°C; metallocene polypropylene has good flexibility and low temperature resistance, random polyolefin has good surface wettability and ductility, and has good compatibility with oils and resins.

[0017] (3) Add 30-40 parts of hydrogenated tackifying resin, reduce the stirring speed to 10-30 revolutions per minute, and after being fully stirred, introduce the mixture into a screw extruder for extrusion and granulation to obtain a high-toughness, high-temperature resistant POE carbon cloth composite rubber product. The hydrogenated tackifying resin, as a tackifier, effectively improves the product's bonding performance, aging resistance, and yellowing resistance.

[0018] The finished high-toughness, high-temperature-resistant POE carbon cloth composite adhesive was subjected to peel strength, tensile shear strength, heat cycling, aging, and spray application tests to ensure compliance with industry standards. The peel strength was ≥15N / 2.5cm, the tensile shear strength was ≥0.8Mpa, and the composite was tested for three cycles of -40°C to 120°C for 24 hours and aging at 180°C for 24 hours. The composite exhibited uniform color and no carbonization or gelling. The spray open time was ≤30s, ensuring uniform adhesive delivery and reduced adhesive consumption.

[0019] The specific formula of the embodiment of the present invention is shown in Table 1:

[0020] Table 1

[0021] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 mineral oil 8 9 7 10 12 15 polyisobutylene 4 4 5 5 2 3 antioxidants 1 1 1 0.5 0.3 0.8 Metallocene polypropylene 9 9 10 10 5 6 Random polyolefins 38 39 38 35 30 40 Hydrogenated tackifying resin 40 38 39 40 30 33

[0022] The present invention tests the performance of the high-toughness and high-temperature-resistant POE carbon cloth composite adhesive products prepared by the formulas of Examples 1 to 6. The specific test results are shown in Table 2:

[0023] Table 2

[0024]

[0025] The high-toughness, high-temperature-resistant POE-based carbon cloth composite adhesive product produced by the present invention has a light-colored block appearance, an apparent viscosity of 3000±500 mPa.s (180°C, rotational viscometer), a softening point of 130±5°C (according to GB / T 15332-1994), an open time of ≤30s (according to HG / T 3716-2003), a peel strength of ≥15N / 2.5cm (referring to GB / T 2791-1995), a shear strength of ≥0.8Mpa (referring to GB / T 7124-2008), and a dielectric loss factor (tanδ) of ≥60 at 180°C. Furthermore, testing of VOC content, heavy metals, and hazardous substances has shown compliance with RoHS and REACH standards.

[0026] The parts mentioned in this application are all parts by weight.

[0027] Although the present invention has been disclosed above with reference to the embodiments, it is not intended to limit the scope of protection of the present invention. Any changes and modifications made by any technician familiar with the technology without departing from the concept and scope of the present invention should fall within the scope of protection of the present invention.

Claims

1. A method for preparing a high-toughness and high-temperature resistant POE carbon cloth composite adhesive, characterized in that: Here are the steps: (1) Add mineral oil, polyisobutylene and antioxidant to a reactor, heat to 140°C to 160°C and stir at a stirring speed of 20 to 30 revolutions per minute until all are melted and the temperature is constant; mineral oil and polyisobutylene are used as viscosity and open time regulators to achieve good fluidity and dispersibility; (2) Adding metallocene polypropylene and random polyolefin, dissolving them one by one, stirring at a speed of 20 to 50 revolutions per minute, until all are melted and the temperature is kept constant at 160°C to 180°C; (3) adding hydrogenated tackifying resin, reducing the stirring speed to 10-30 revolutions per minute, and after being fully stirred, introducing the mixture into a screw extruder for extrusion and granulation to obtain a high-toughness and high-temperature resistant POE carbon cloth composite rubber product.

2. The method for preparing a high-toughness and high-temperature resistant POE carbon cloth composite adhesive according to claim 1, characterized in that: 10-15 parts of mineral oil used in step (1), 2-5 parts of polyisobutylene, and 0.3-1 part of antioxidant; 5-10 parts of metallocene polypropylene used in step (2), and 30-40 parts of random polyolefin; and 30-40 parts of hydrogenated tackifying resin used in step (3).

3. The method for preparing a high-toughness and high-temperature resistant POE carbon cloth composite adhesive according to claim 1, characterized in that: In step (1), mineral oil, polyisobutylene and antioxidant are added in sequence.

4. The method for preparing a high-toughness and high-temperature resistant POE carbon cloth composite adhesive according to claim 1, characterized in that: In step (2), metallocene polypropylene is first added, and after it is dissolved, random polyolefin is added.

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