Viscoelastic anticorrosve glue, and preparation method and application thereof

Abstract

A viscoelastic anticorrosive adhesive, its preparation method, and its application are disclosed. The viscoelastic anticorrosive adhesive comprises the following components in parts by weight: 30-40 parts of polyisobutylene, 55-65 parts of inorganic filler, 1-2 parts of a silicon oxide and polyamide wax compound, and 0-2 parts of an anti-aging agent. The polyisobutylene is mainly composed of a mixture of polyisobutylene with a molecular weight of 30,000-50,000 and polyisobutylene with a molecular weight of 80,000-100,000. After mixing, the molecular weight of the polyisobutylene is 50,000-80,000. The polyisobutylene exhibits strong cohesive force and the ability to wet the substrate, thus preventing the occurrence of "overcooling flow." A viscoelastic anticorrosve glue, a preparation method thereof, and an application thereof. The viscoelastic anticorrosive glue comprises the following components in parts by weight: 30-40 parts of polyisobutylene, 55-65 parts of inorganic filler, 1 to 2 parts of a compound composed of silicon oxide and polyamide wax, and 0 to 2 parts of an anti-aging agent; wherein, the polyisobutene is mainly formed by mixing the polyisobutene with a molecular weight of 30,000 to 50,000 and the polyisobutene with a molecular weight of 80,000 to 100,000 which forms the polyisobutene with a molecular weight of 50,000-80,000, wherein the polyisobutylene has the strong cohesive force therebetween, and the ability of moistening a substrate, so as to be able to prevent the occurrence of a phenomenon of "super cold fluidity".

Description

[Technical Field]

[0001] This invention relates to the field of adhesive technology, and in particular to a viscoelastic anti-corrosion adhesive, its preparation method and application. [Previous Technology]

[0002] Viscoelastic anticorrosion material is a flexible polymer anticorrosion material. This material has a unique cold flow characteristic, that is, under a certain time and a certain external force, the material can penetrate into the micro surface of the substrate through the cold flow action, fill the gaps and improve the adhesion. This characteristic gives it excellent waterproof sealing and excellent adhesion ability, and it can effectively bond to various substrates. It achieves the purpose of preventing corrosion by isolating air and moisture.

[0003] Some domestic manufacturers have already researched and produced viscoelastic anti-corrosion materials. However, according to the results of the survey and verification, the viscoelastic anti-corrosion materials produced domestically have quality problems such as adhesion and sealing failure and dripping. Further research and testing show that the most difficult point in viscoelastic anti-corrosion materials is to maintain the cold flow characteristics of the material without "over-cold flow" which would cause dripping and flowing phenomena. At present, viscoelastic anti-corrosion materials still cannot find a balance point in this performance, thus greatly reducing the anti-corrosion effect. [Summary of the Invention]

[0004] This invention addresses the problem that existing viscoelastic anticorrosion materials cannot find a suitable balance between cold flow characteristics and the inability to "over-cold flow," resulting in poor anticorrosion performance. This invention provides a viscoelastic anticorrosion adhesive that has both cold flow characteristics and is not "over-cold flow," thus exhibiting good anticorrosion performance.

[0005] In one aspect, the present invention provides a viscoelastic anticorrosive adhesive, comprising the following components in parts by weight: 30-40 parts of polyisobutylene, 55-65 parts of inorganic filler, 1-2 parts of a silicon oxide and polyamide wax compound, and 0-2 parts of an anti-aging agent; wherein the polyisobutylene is mainly composed of a mixture of polyisobutylene with a molecular weight of 30,000-50,000 and polyisobutylene with a molecular weight of 80,000-100,000, and the molecular weight of the polyisobutylene is 50,000-80,000.

[0006] Further specified, the silicon oxide and polyamide wax compound is mainly composed of fumed silica and polyamide wax micro powder mixed in a mass ratio of 0.1-1.5:0.5-2.0.

[0007] Further specified, the mass ratio of the fumed silica to the polyamide wax micro powder is 1:1.

[0008] Further specified, the mass ratio of the polyisobutylene with a molecular weight of 30,000 to 50,000 to the polyisobutylene with a molecular weight of 80,000 to 100,000 is 3 to 17:20.

[0009] Further specified, the inorganic filler is selected from at least one of sulfate, phosphate and carbonate.

[0010] Further specified, the anti-aging agent is a sterically hindered phenolic binary anti-aging agent.

[0011] The beneficial effects of the present invention are as follows: 1. By using a compound of silicon oxide and polyamide wax, the "supercooling flow" can be prevented from occurring without affecting the cold flow characteristics of polyisobutylene, thus preventing dripping and flowing during use. 2. The molecular weight of the mixed polyisobutylene is controlled between 50,000 and 80,000. The polyisobutylene has strong cohesive force and the ability to wet the substrate, thus also avoiding the occurrence of "supercooling flow". 3. The viscoelastic anticorrosion adhesive obtained by the present invention has good anticorrosion performance, and therefore has good application prospects as an anticorrosion sealing material in pipelines and special-shaped steel structures in the oil and gas industry and chemical enterprises.

[0012] On the other hand, the present invention also provides a method for preparing a viscoelastic anticorrosive adhesive, the method comprising: mixing the polyisobutylene, inorganic filler, silicon oxide and polyamide wax compound and anti-aging agent, heating to 90-110°C, dispersing at different dispersion speeds multiple times, and then cooling to 60-70°C for extrusion molding.

[0013] Further, before or simultaneously with the dispersion, the process includes revolution mixing, with a revolution mixing speed of 0.3 m / s to 0.5 m / s; preferably, in the process of further dispersing at multiple different dispersion speeds, the dispersion speed is 30 m / s to 50 m / s; preferably, in the process of further dispersing at multiple different dispersion speeds, the final dispersion is carried out in a vacuum environment.

[0014] The beneficial effects of the present invention are as follows: By setting different dispersion speeds and dispersing multiple times, the silicon oxide and polyamide wax compound can fully encapsulate polyisobutylene, thereby achieving both acid and alkali resistance; during the preparation process, polyisobutylene does not decompose or volatilize, and the molecular weight is controlled within the ideal range, thereby ensuring that the prepared viscoelastic anticorrosive adhesive has good anticorrosive properties and suitable cold flow performance.

[0015] In order to make the above and other objects, features and advantages of the present invention more apparent and understandable, embodiments are described below in detail with reference to the accompanying drawings.

Implementation Method

[0017] The viscoelastic anti-corrosion adhesive provided by the present invention can be used as an adhesive. Specifically, it can be coated on one side of transparent tape or the surface of other objects that need to be bonded, to achieve sealing or adhesion of two objects to form a whole. As used herein, "viscoelastic" also refers to a material that simultaneously possesses both elastic and viscous deformation mechanisms, comprehensively exhibiting the characteristics of both viscous fluids and elastic solids. As used herein, "anti-corrosion adhesive" refers to a specially formulated, high-molecular-weight adhesive for joints, which can be used as a dielectric compound and an anti-corrosion agent.

[0018] The viscoelastic anticorrosive adhesive according to the present invention has excellent cold flow characteristics and does not drip or flow. As used herein, "cold flow characteristics" refers to the ability of the viscoelastic material to completely fill the gaps in the pipe through its own cold flow under a certain external force, preventing moisture and air from penetrating. "Dripping" refers to the phenomenon that the viscoelastic material slips or slides under a certain external force and temperature, resulting in a thinning of the adhesive layer. "Flowing" refers to the phenomenon that the viscoelastic material becomes liquid under a certain external force and temperature, causing the adhesive layer to leak out and leading to anticorrosion failure.

[0019] On one hand, the present invention provides a viscoelastic anticorrosive adhesive as used herein, the viscoelastic anticorrosive adhesive may include the following components in parts by weight: 30-40 parts of polyisobutylene, 55-65 parts of inorganic filler, 1-2 parts of a silicon oxide and polyamide wax compound, and 0-2 parts of an anti-aging agent; wherein the polyisobutylene is mainly composed of a mixture of polyisobutylene with a molecular weight of 30,000-50,000 and polyisobutylene with a molecular weight of 80,000-100,000, and the molecular weight of the polyisobutylene is 50,000-80,000; as used herein, "polyisobutylene" refers to a polymer obtained by cationic polymerization of isobutylene, whose molecular weight can range from hundreds to millions, and is a typical saturated linear polymer, whose molecular chain does not contain double bonds and has no long branches, and whose structural unit is -(CH2-C(CH3)). 2)-, wherein there are no asymmetric carbon atoms, and the structural units are connected in a regular sequence from head to tail; as used herein, the "silicon oxide and polyamide wax complex" refers to a mixture of silicon oxide and polyamide wax micropowder in a certain proportion, such as a mass ratio of silicon oxide to polyamide wax micropowder of 0.1-1.5:0.5-2.0, preferably 1:1. The "silicon oxide" refers to silicon dioxide, preferably silicon dioxide prepared by the gas phase method, abbreviated as "gas phase silicon dioxide". The "polyamide wax micropowder" This refers to the process of directly pulverizing solid polyamide wax or atomizing and cooling molten liquid wax. As used herein, the silicon oxide and polyamide wax compound can prevent "supercooling flow" (i.e., dripping and flowing) without affecting the cold flow characteristics of polyisobutylene. This is mainly because both silicon oxide and polyamide wax powder form a three-dimensional network structure. When subjected to force, the structure is destroyed and deformed, thus generating a cold flow effect. When the force weakens or disappears, the three-dimensional structure is reformed to prevent the material from "supercooling flow". Since the addition of silicon oxide is relatively large, it will be affected by alkali resistance, and the dispersibility of polyamide wax powder is not as good as that of silicon oxide. Therefore, the two are compounded under comprehensive consideration.

[0020] The polyisobutylene used in the viscoelastic anticorrosive adhesive according to the present invention can avoid the occurrence of "overcooling flow" phenomenon; in some specific embodiments, the polyisobutylene is mainly composed of polyisobutylene with a molecular weight of 30,000 to 50,000 and polyisobutylene with a molecular weight of 80,000 to 100,000, with a mass ratio of 3 to 17:20, preferably 5:10; the excellent cold flow characteristics, air tightness, water resistance and initial tack of polyisobutylene with a molecular weight of 30,000 to 50,000 can initially wet the surface of the substrate, and the excellent cold flow characteristics, air tightness, water resistance and sustained tack of polyisobutylene with a molecular weight of 80,000 to 100,000 can enhance the cohesive force of the material itself; as used herein, the "substrate" is such as plastic, rubber and metal, etc., and as used herein, the "material" refers to the viscoelastic anticorrosive adhesive.

[0021] The inorganic filler used in the viscoelastic anticorrosive adhesive according to the present invention, the "filler" is also known as filler, additive, or filler material, and is a solid substance that can improve the performance of the material or increase its volume and weight, and reduce the cost of the material when added to the material; the inorganic filler includes, but is not limited to, at least one of sulfate, phosphate and carbonate, and can be a mixture of sulfate, phosphate and carbonate in a certain mass ratio, such as an equal proportion, or any two of the three can be mixed in a certain mass ratio, such as an equal proportion, or one of the three.

[0022] The anti-aging agent used in the viscoelastic preservative according to the present invention is mainly used to prevent the decomposition and volatilization of polyisobutylene during the preparation and storage of the viscoelastic preservative, so as to control the molecular weight of polyisobutylene within a suitable range and achieve the corresponding effect. The anti-aging agent includes, but is not limited to, sterically hindered phenolic binary anti-aging agents, which refer to phenolic salts of sterically hindered phenolic compounds containing at least two phenolic hydroxyl groups, such as, but not limited to, RGANOX 1010 and RGAFOS 168; whether the anti-aging agent is added and the specific amount added are determined according to the molecular weight of polyisobutylene and the mixing temperature.

[0023] On the other hand, the viscoelastic anticorrosive adhesive according to the present invention can be prepared by the following method: S1. The polyisobutylene, inorganic filler, silicon oxide and polyamide wax compound and anti-aging agent are mixed and heated to 90-110°C; S2. The mixture is then dispersed at different dispersion speeds multiple times, and then cooled to 60-70°C for extrusion molding. The temperature of the dispersion process is determined according to the dispersion speed, the revolution speed and the polyisobutylene.

[0024] In order to ensure that the silicon oxide and polyamide wax compound can be fully encapsulated by polyisobutylene and the resulting viscoelastic anticorrosive adhesive has good acid and alkali resistance, in step S2, dispersion is performed multiple times at different dispersion speeds, wherein the dispersion is performed no less than twice, preferably twice. The dispersion speed during the first dispersion is 30 m / s to 50 m / s, preferably 30 m / s to 40 m / s. The dispersion speed during the last dispersion is greater than that during the first dispersion, preferably 40 m / s to 50 m / s, preferably 50 m / s. The last dispersion is performed in a vacuum environment. The first dispersion takes 3 to 4 hours, preferably 4 hours. The last dispersion takes no less than 30 minutes, preferably 50 minutes.

[0025] In order to improve the encapsulation performance, before the first dispersion, the mixture obtained in step S1 is subjected to revolution mixing at a speed of 0.3 m / s to 0.5 m / s, preferably 0.5 m / s, and the revolution mixing time is 20 to 40 minutes, preferably 30 minutes; preferably, after revolution for 20 to 40 minutes, multiple dispersions are carried out simultaneously to achieve the purpose of mixing, and the mixing time is 3 to 4 hours.

[0026] In order to better control the molecular weight of polyisobutylene in the finished product, the extrusion temperature of the mixture during cooling and molding after the last dispersion is 60-70°C, preferably 65°C.

[0027] Example 1:

[0028] The viscoelastic anticorrosive adhesive of this embodiment includes: 37 parts by weight of medium molecular weight polyisobutylene, 61 parts of inorganic filler, and 2 parts of silicon oxide and polyamide wax compound.

[0029] Wherein, the medium molecular weight polyisobutylene comprises 21 parts of medium molecular weight polyisobutylene with a molecular weight of 30,000 to 50,000 and 16 parts of medium molecular weight polyisobutylene with a molecular weight of 80,000 to 100,000, and the molecular weight of the polyisobutylene after compounding is 60,000 to 70,000. The inorganic filler comprises calcium carbonate and barium sulfate mixed in equal proportions. The silicon oxide and polyamide wax compound is a mixture of fumed silica and polyamide wax micro powder in equal proportions.

[0030] The preparation method of the viscoelastic anticorrosive adhesive in this embodiment includes the following steps: After heating the material pot to 90°C, polyisobutylene, inorganic filler, silicon oxide and polyamide wax compound are put into the material pot and mixed. The mixture is mixed using a double planetary mixer. The revolution speed of the stirring rod is set to 0.4 m / s. After mixing for 30 minutes, the dispersion speed of the stirring rod is set to 37-43 m / s. After mixing for 3 hours, the material pot is kept under vacuum and the dispersion speed is set to 55 m / s. The mixture is then kept in a mixing state for 30 minutes to obtain a mixed rubber compound. Measures are taken to keep the material temperature at 120°C throughout the mixing process. After cooling the mixed rubber compound, it is extruded at 60°C.

[0031] Example 2:

[0032] The viscoelastic anticorrosive adhesive of this embodiment includes: 37 parts by weight of medium molecular weight polyisobutylene, 61 parts of inorganic filler, and 2 parts of silicon oxide and polyamide wax compound.

[0033] Wherein, the medium molecular weight polyisobutylene comprises 32 parts of medium molecular weight polyisobutylene with a molecular weight of 30,000 to 50,000 and 5 parts of medium molecular weight polyisobutylene with a molecular weight of 80,000 to 100,000, and the molecular weight of the polyisobutylene after compounding is 50,000 to 60,000. The inorganic filler comprises calcium carbonate and barium sulfate mixed in equal proportions. The silicon oxide and polyamide wax compound is a mixture of fumed silica and polyamide wax micro powder in equal proportions.

[0034] The preparation method of the viscoelastic anticorrosive adhesive in this embodiment includes the following steps: After heating the material pot to 100°C, polyisobutylene, inorganic filler, silicon oxide and polyamide wax compound are put into the material pot and mixed. The mixture is mixed using a double planetary mixer. The revolution speed of the stirring rod is set to 0.5 m / s. After mixing for 30 minutes, the dispersion speed of the stirring rod is set to 44-50 m / s. After mixing for 3 hours, the material pot is kept under vacuum and the dispersion speed is set to 55 m / s. The mixture is then kept in a mixing state for 30 minutes to obtain a mixed rubber compound. Measures are taken to keep the material temperature at 100°C throughout the mixing process. After cooling the mixed rubber compound, it is extruded at 70°C.

[0035] Example 3:

[0036] The viscoelastic anticorrosive adhesive of this embodiment includes, by weight, 37 parts of medium molecular weight polyisobutylene, 61 parts of inorganic filler, 2 parts of silicon oxide and polyamide wax compound, and 2 parts of anti-aging agent.

[0037] Wherein, the medium molecular weight polyisobutylene comprises 5 parts of medium molecular weight polyisobutylene with a molecular weight of 30,000 to 50,000 and 32 parts of medium molecular weight polyisobutylene with a molecular weight of 80,000 to 100,000, and the molecular weight of the polyisobutylene after compounding is 70,000 to 80,000. The inorganic filler comprises calcium carbonate and barium sulfate mixed in equal proportions. The silicon oxide and polyamide wax compound is a mixture of fumed silica and polyamide wax micro powder in equal proportions, and the anti-aging agent is a sterically hindered phenolic binary anti-aging agent.

[0038] The preparation method of the viscoelastic anticorrosive adhesive in this embodiment includes the following steps: After heating the material pot to 100°C, polyisobutylene, inorganic filler, silicon oxide and polyamide wax compound, and anti-aging agent are put into the material pot and mixed. The mixture is mixed using a double planetary mixer. The revolution speed of the stirring rod is set to 0.3 m / s. After mixing for 30 minutes, the dispersion speed of the stirring rod is set to 30-36 m / s. After mixing for 3 hours, the material pot is kept under vacuum and the dispersion speed is set to 55 m / s. The mixture is then kept in a mixing state for 30 minutes to obtain a mixed rubber compound. Measures are taken to keep the material temperature at 150°C throughout the mixing process. After cooling the mixed rubber compound, it is extruded and molded at 65°C.

[0039] Example 4:

[0040] The viscoelastic anticorrosive adhesive of this embodiment includes: 37 parts by weight of medium molecular weight polyisobutylene, 61 parts of inorganic filler, and 2 parts of silicon oxide and polyamide wax compound.

[0041] Wherein, the medium molecular weight polyisobutylene comprises 21 parts of medium molecular weight polyisobutylene with a molecular weight of 30,000 to 50,000 and 16 parts of medium molecular weight polyisobutylene with a molecular weight of 80,000 to 100,000, and the molecular weight of the polyisobutylene after compounding is 60,000 to 70,000. The inorganic filler is calcium carbonate. The silicon oxide and polyamide wax compound is a mixture of fumed silica and polyamide wax micro powder in equal proportions.

[0042] The preparation method of the viscoelastic anticorrosive adhesive in this embodiment is the same as that in Example 1.

[0043] Example 5:

[0044] The viscoelastic anticorrosive adhesive of this embodiment includes: 37 parts by weight of medium molecular weight polyisobutylene, 61 parts of inorganic filler, and 2 parts of silicon oxide and polyamide wax compound.

[0045] Wherein, the medium molecular weight polyisobutylene comprises 21 parts of medium molecular weight polyisobutylene with a molecular weight of 30,000 to 50,000 and 15 parts of medium molecular weight polyisobutylene with a molecular weight of 80,000 to 100,000, and the molecular weight of the polyisobutylene after compounding is 60,000 to 70,000. The inorganic filler is barium sulfate. The silicon oxide and polyamide wax compound is a mixture of fumed silica and polyamide wax micro powder in equal proportions.

[0046] The preparation method of the viscoelastic anticorrosive adhesive in this embodiment is the same as that in Example 1.

[0047] Example 6:

[0048] The formula in this embodiment is the same as that in Example 1.

[0049] The preparation method of the viscoelastic anticorrosive adhesive in this embodiment includes the following steps: After heating the material pot to 100°C, polyisobutylene, inorganic filler, silicon oxide and polyamide wax compound are put into the material pot and mixed. The mixture is mixed using a double planetary mixer. The revolution speed of the stirring rod is set to 0.5 m / s. After mixing for 30 minutes, the dispersion speed of the stirring rod is set to 44-50 m / s. After mixing for 4 hours, the material pot is kept under vacuum and the dispersion speed is set to 60 m / s. The mixture is then kept in a mixing state for 30 minutes to obtain a mixed rubber compound. Measures are taken to keep the material temperature at 135°C throughout the mixing process. After cooling the mixed rubber compound, it is extruded at 70°C.

[0050] Comparative Example 1

[0051] The formulation and preparation method of the viscoelastic anticorrosive adhesive in this comparative example are the same as those in Example 1, except that polyisobutylene with a molecular weight of 30,000 to 50,000 is not added.

[0052] Comparative Example 2

[0053] The formulation and preparation method of the viscoelastic anticorrosive adhesive in this comparative example are the same as those in Example 1, except that polyisobutylene with a molecular weight of 80,000 to 100,000 is not added.

[0054] Comparative Example 3

[0055] The formulation and preparation method of the viscoelastic anticorrosive adhesive in this comparative example are the same as those in Example 1, except that fumed silica is not added.

[0056] Comparative Example 4

[0057] The formulation and preparation method of the viscoelastic anticorrosive adhesive in this comparative example are the same as those in Example 1, except that polyamide wax micro powder is not added.

[0058] Comparative Example 5

[0059] 5 parts butyl rubber, 8 parts high molecular weight polyisobutylene (polyisobutylene molecular weight greater than 100,000), 30 parts medium molecular weight polyisobutylene, 15 parts low molecular weight polyisobutylene (polyisobutylene molecular weight less than 30,000), 40 parts inorganic reinforcing powder calcium carbonate, 0.5 parts antioxidant 1010, 0.5 parts antioxidant 264, and 1.0 part pigment phthalocyanine green. The preparation method is the same as in Example 3.

[0060] Comparative Example 6

[0061] The formulation of the viscoelastic anticorrosive adhesive in this comparative example is the same as that in Example 1, except that the preparation process is different.

[0062] The preparation method of the viscoelastic anticorrosive adhesive in this embodiment includes the following steps: After heating the material pot to 100°C, polyisobutylene, inorganic filler, silicon oxide and polyamide wax compound are put into the material pot and mixed. The mixture is mixed using a double planetary mixer. The revolution speed of the stirring rod is set to 0.2 m / s. After mixing for 30 minutes, the dispersion speed of the stirring rod is set to 20 m / s. After mixing for 3 hours, a mixed rubber compound is obtained. Measures are taken to maintain the material temperature at 150°C throughout the mixing process. After cooling the mixed rubber compound, it is extruded at 70°C.

[0063] The tapes prepared in Examples 1-6 and Comparative Examples 1-6 were tested after being wrapped around the pipe surface. The specific test results are shown in Table 1: Table 1 Test Project Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Peel strength / N / cm 4.7 3.1 7.9 4.5 4.8 4.9 Stripping coverage / % 100 99 96 100 100 100 90° drip (48h) none none none none none none Chemical media immersion (90 days) No change No change No change No change No change No change Test Project Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Peel strength / N / cm 8.9 1.9 4.3 4.4 9.7 2.4 Stripping coverage / % 87 95 99 100 65 70 90° drip (48h) none yes yes none yes none Chemical media immersion (90 days) No change No change No change break down Undigested break down

[0064] As can be seen from Table 1, the viscoelastic anti-corrosion adhesive layer prepared by Examples 1-6 has good peel strength and peel coverage, and will not drip at high temperature and will not decompose when immersed in chemical media, meeting the performance index requirements of viscoelastic anti-corrosion materials in ISO 21809-3: 2016 External coatings for buried or submerged pipelines used in pipeline transportation systems—Part 3: Field joint coatings and GB / T 51241-2017 standards.

[0065] As can be seen from the comparison between Example 1 and Comparative Examples 1 and 2, polyisobutylene with a molecular weight of 80,000 to 100,000 has a significant impact on the peel strength and peel coverage of the viscoelastic anticorrosive layer. Specifically, the peel strength is significantly enhanced, while the peel coverage is significantly reduced. Polyisobutylene with a molecular weight of 30,000 to 50,000 has a significant impact on the peel strength and 90°C dripping performance of the viscoelastic anticorrosive layer. Specifically, the peel strength is significantly reduced, and the 90°C dripping performance does not meet the non-dripping performance requirement. Therefore, it can be seen that using polyisobutylene with a molecular weight of 80,000 to 100,000 and polyisobutylene with a molecular weight of 30,000 to 50,000 can significantly adjust the peel strength and peel coverage, which is beneficial for achieving a suitable peel strength range and a peel coverage close to 100%.

[0066] As can be seen from the comparison between Example 1 and Comparative Examples 3 and 4, fumed silica and polyamide wax micro powder have no significant effect on the peel strength and peel coverage of the viscoelastic anticorrosive adhesive layer, but they have a certain impact on the 90°C dripping performance or the chemical medium immersion performance (90 days). Specifically: fumed silica affects the chemical medium immersion performance (90 days). When only fumed silica is added, it will decompose, resulting in poor anticorrosion ability; polyamide wax micro powder affects the 90°C dripping performance. When only polyamide wax micro powder is added, the 90°C dripping performance requirement cannot be met, and dripping will occur.

[0067] Compared with Example 3 and Comparative Example 5, the adhesive layer formed by coating with existing viscoelastic anticorrosive adhesive does not meet the requirements for peel strength, peel coverage and 90°C drip performance.

[0068] Compared with Comparative Example 6, due to the different preparation methods, the viscoelastic anticorrosive layer obtained in Example 1 did not meet the requirements in terms of peel strength, peel coverage, 90°C drip performance, and chemical medium immersion performance (90 days). Specifically, the different dispersion speeds, the mixing of the last dispersion in a vacuum environment, the setting of the revolution mixing, and the simultaneous occurrence of revolution mixing and dispersion will all affect the performance of the obtained viscoelastic anticorrosive layer in terms of peel strength, peel coverage, 90°C drip performance, and chemical medium immersion performance (90 days).

[0069] In summary, the silicon oxide and polyamide wax compound can prevent "over-cooling flow" of polyisobutylene without affecting its cold flow characteristics, thus preventing dripping and flowing during use. The molecular weight of polyisobutylene is controlled between 50,000 and 80,000, and the polyisobutylene molecules exhibit strong cohesive forces and the ability to wet the substrate, thus also preventing "over-cooling flow." The viscoelastic anticorrosion adhesive obtained by this invention has excellent anticorrosion performance, making it a promising anticorrosion sealing material for pipelines and irregular steel structures in the oil and gas industry and chemical enterprises. By setting different dispersion speeds and dispersing multiple times, the silicon oxide and polyamide wax compound can fully encapsulate the polyisobutylene, achieving both acid and alkali resistance. During the preparation process, the polyisobutylene does not decompose or volatilize, and the molecular weight is controlled within an ideal range, ensuring that the prepared viscoelastic anticorrosion adhesive has good anticorrosion properties and suitable cold flow performance.

[0070] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention. [Simplified Explanation of the Diagram]

[0016] None

Claims

1. A viscoelastic anti-corrosion adhesive, characterized in that it comprises the following components in parts by weight: 30-40 parts polyisobutylene, 55-65 parts inorganic filler, 1-2 parts silicon oxide and polyamide wax compound, and 0-2 parts anti-aging agent; wherein, The polyisobutylene is mainly composed of polyisobutylene with a molecular weight of 30,000 to 50,000 and polyisobutylene with a molecular weight of 80,000 to 100,000, and the molecular weight of the polyisobutylene after mixing is 50,000 to 80,000.

2. The viscoelastic anticorrosive adhesive as claimed in claim 1, characterized in that the silicon oxide and polyamide wax compound is mainly composed of fumed silica and polyamide wax micro powder mixed in a mass ratio of 0.1-1.5:0.5-2.

0.

3. The viscoelastic anticorrosive adhesive as claimed in claim 2, characterized in that the mass ratio of the fumed silica to the polyamide wax micropowder is 1:

1.

4. The viscoelastic anticorrosive adhesive as claimed in claim 1, characterized in that the mass ratio of the polyisobutylene with a molecular weight of 30,000 to 50,000 to the polyisobutylene with a molecular weight of 80,000 to 100,000 is 3 to 17:

20.

5. The viscoelastic anticorrosive adhesive as claimed in claim 1, characterized in that the inorganic filler is selected from at least one of sulfates, phosphates and carbonates.

6. The viscoelastic anticorrosive adhesive as claimed in claim 1, characterized in that the anti-aging agent is a sterically hindered phenolic binary anti-aging agent.

7. A method for preparing a viscoelastic anticorrosive adhesive as described in any one of claims 1-6, characterized in that the preparation method comprises: The polyisobutylene, inorganic filler, silicon oxide and polyamide wax compound and anti-aging agent are mixed and heated to 90-110°C, then dispersed at different dispersion speeds multiple times, and finally cooled to 60-70°C for extrusion molding.

8. The preparation method as claimed in claim 7, characterized in that, before or simultaneously with the dispersion, it further includes revolution mixing, the revolution mixing speed being 0.3 m / s to 0.5 m / s.

9. The preparation method as claimed in claim 7, characterized in that, in the multiple dispersion processes at different dispersion speeds, the dispersion speed is 30 m / s to 50 m / s; preferably, in the multiple dispersion processes at different dispersion speeds, the final dispersion is carried out in a vacuum environment.

10. The application of the viscoelastic anticorrosive adhesive according to any one of claims 1-6 as an anticorrosive sealing material in pipelines and irregular steel structures in the oil and gas industry and chemical enterprises.