Six-membered heterocyclic compound sealing material and preparation method thereof

Abstract

The invention relates to the field of adhesives, in particular to a six-membered heterocyclic compound sealing material and a preparation method thereof. According to the technical scheme, the six-membered heterocyclic compound sealing material and the preparation method thereof comprise the following raw materials: a component A which is a mixture of a polyether isocyanate adduct and / or a polyester isocyanate adduct; the component B is prepared from the following raw materials in parts by weight: 2-15 parts of a diamine compound, 0.1-5 parts of aziridine, 0.2-5 parts of an antioxidant, 0.1-3 parts of a defoaming agent, 0.2-4 parts of a coupling agent, 5-40 parts of a nano modified inert mineral, 5-75 parts of a mixture of fused polycyclic aromatic compounds and 5-55 parts of an acrylic polymer. The solvent-free elastic adhesive has good elasticity, tearing strength, excellent adhesive force and temperature resistance; meanwhile, the adhesive material has excellent solvent resistance, acid-base resistance and other chemicals, and can be applied to adhesion between various properly treated base materials or between different materials.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of adhesive, in particular to a six-membered heterocyclic compound sealing material and a preparation method thereof. BACKGROUND

[0002] As a kind of material for bonding the surface of homogeneous or heterogeneous objects, adhesive has the characteristics of convenience, rapidity and low cost, and is widely used in many fields. However, different use environments and use fields have special requirements for the properties of adhesive. For example, current adhesives in industrial fields or even decoration need to be environmentally friendly. For the sealing of electronic components in power systems, the adhesive used needs to have good insulation and flame retardance. Because of the wide range of applications, in many fields, the adhesive is required to be not only environmentally friendly and solvent-free, but also to have certain elasticity and tensile strength after bonding, and to have good aging resistance and chemical corrosion resistance. In many industrial fields, it can resist the corrosion of acid, alkali, salt and other chemicals. At the same time, the adhesive is required to have certain temperature resistance. However, due to the continuous development and diversification of the market, the variety and quality of the existing adhesives on the market cannot meet the current market requirements. SUMMARY

[0003] In order to overcome the problems raised in the above background art.

[0004] The technical solution of the present application is: a six-membered heterocyclic compound sealing material, comprising raw material A component and raw material B component; by volume ratio, A component:B component = 1:(0.5-3); wherein, the A component is a mixture of polyether isocyanate adduct and / or polyester isocyanate adduct, the branching degree of which is 2-4, and the mass percentage content of isocyanate in the mixture of polyether isocyanate adduct and / or polyester isocyanate adduct is 1.5-12%; the B component includes the following raw materials and their proportions: 2-15 parts of diamine compound, 0.1-5 parts of aziridine, 0.2-5 parts of antioxidant, 0.1-3 parts of defoaming agent, 0.2-4 parts of coupling agent, 5-40 parts of nano-modified inert mineral, 5-75 parts of mixture of condensed polycyclic aromatic compounds, 5-55 parts of acrylic polymer and 0.5-10 parts of six-membered heterocyclic compound as sealing enhancer.

[0005] As a preferred embodiment, the six-membered heterocyclic compound is selected from at least one of pyridine, pyrimidine, pyrazine or derivatives thereof, for enhancing the sealing performance and chemical resistance of the adhesive.

[0006] As a preferred embodiment, the diamine compound is a sulfur-based diamine compound, in particular dimethylthio toluene diamine, which synergistically acts with the six-membered heterocyclic compound to improve the elasticity and tear resistance of the adhesive.

[0007] Preferably, the antioxidant is an aromatic amine antioxidant and / or a hindered phenol antioxidant, which works together with the six-membered heterocyclic compound to improve the weather resistance and thermal stability of the adhesive.

[0008] Preferably, the nano-modified inert mineral is an inert mineral nanopowder or an inert mineral nanofiber, specifically a mixture of one or more of carbon, silicon, calcium, magnesium, aluminum, barium and inert silicates, combined with a six-membered heterocyclic compound to enhance the adhesion and temperature resistance of the adhesive.

[0009] Preferably, the mixture of condensed polycyclic aromatic compounds is purified asphalt, and the purification method is one of vacuum distillation, high-temperature reduced pressure distillation or rectification, which together with the six-membered heterocyclic compound improves the chemical corrosion resistance of the adhesive.

[0010] Preferably, the acrylic polymer is a polymer obtained by polymerizing one or more of acrylic acid and acrylate monomers, or a low molecular weight liquid petroleum resin with a number average molecular weight of 60 to 1500, which is combined with a six-membered heterocyclic compound to optimize the rheological properties and curing speed of the adhesive.

[0011] Preferably, the preparation of component A comprises the following steps:

[0012] S1001: Dehydrating the polyether polyol and / or polyester to remove moisture therein to ensure smooth progress of subsequent reactions;

[0013] S1002: using an isocyanate compound, including an aliphatic isocyanate compound and / or an aromatic isocyanate compound, or one or a mixture of toluene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate, to prepolymerize the dehydrated polyether polyol and / or polyester;

[0014] S1003: The reaction is carried out in a high-pressure reactor at a reaction temperature of 120-150° C. and a prepolymerization time of 5-8 hours to obtain a mixture of polyether isocyanate adducts and / or polyester isocyanate adducts, wherein the mass percentage of the isocyanate compound is 1.5-12% and the degree of branching is 2-4.

[0015] Preferably, the preparation of component B includes the following steps:

[0016] S2001: Mix and stir the raw materials of component B in proportion at a temperature range of 8-35°C until uniform. Component B includes: 2-15 parts of a diamine compound, 0.1-5 parts of aziridine, 0.2-5 parts of an antioxidant, 0.1-3 parts of a defoaming agent, 0.2-4 parts of a coupling agent, 5-40 parts of a nano-modified inert mineral, 5-75 parts of a mixture of fused polycyclic aromatic compounds, 5-55 parts of an acrylic polymer, and 0.5-10 parts of a six-membered heterocyclic compound as a sealing enhancer.

[0017] S2002: During the mixing process, the six-membered heterocyclic compound is added at the final stage of mixing the raw materials of component B.

[0018] Preferably, the preparation of the sealing material includes the following steps:

[0019] S3001: Mix the prepared component A and component B in a volume ratio of 1:(0.5-3) and stir evenly to obtain a six-membered heterocyclic compound sealing material. The sealing material has a viscosity of 85-95 KU at 25° C. and has the best performance.

[0020] S3002: The usable time after sizing is within 30-90 minutes;

[0021] S3003: It takes 48 hours to reach maximum strength. After curing, it forms a sealing layer with excellent elasticity, tear strength, excellent adhesion and temperature resistance.

[0022] Beneficial effects of the present invention:

[0023] Compared with existing six-membered heterocyclic compound sealing materials, it is impossible to flexibly adjust the raw materials and proportions according to specific usage conditions, which makes it difficult to adapt to a variety of usage environments. At the same time, it lacks sufficient weather resistance and acid and alkali resistance, making the sealing material prone to aging or failure in harsh environments. It is mainly suitable for bonding between specific materials and is difficult to be applied to a wider range of materials. A two-component solvent-free elastic adhesive is prepared by using one or more mixtures of multi-branched polyether isocyanate and / or polyester isocyanate adducts as a curing cross-linking agent, and a mixture of condensed polycyclic aromatic compounds, and a mixture B of carbon, silicon, metal powder nano-modified inert minerals, and other materials. After proper stirring and construction curing, the product has excellent elasticity and excellent tensile strength at break, and is resistant to chemicals such as acid and alkali corrosion and temperature resistance. The product can be used in a variety of occasions and substrates, and has excellent elastic elongation, excellent adhesion and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Shown is a schematic diagram of the sealing material preparation process of a method for preparing a six-membered heterocyclic compound sealing material of the present invention. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings and examples.

[0026] See also Figure 1 The present invention provides an embodiment: a six-membered heterocyclic compound sealing material, comprising a raw material component A and a raw material component B; the volume ratio of component A: component B is 1:(0.5-3); wherein component A is a mixture of polyether isocyanate adducts and / or polyester isocyanate adducts, the degree of branching of which is 2-4, and the mass percentage of isocyanate in the mixture of polyether isocyanate adducts and / or polyester isocyanate adducts is 1.5-12%; the raw materials and the proportions of the raw materials included in component B are: 2-15 parts of a diamine compound, 0.1-5 parts of aziridine, 0.2-5 parts of an antioxidant, 0.1-3 parts of a defoaming agent, 0.2-4 parts of a coupling agent, 5-40 parts of a nano-modified inert mineral, 5-75 parts of a mixture of condensed polycyclic aromatic compounds, 5-55 parts of an acrylic polymer, and 0.5-10 parts of a six-membered heterocyclic compound as a sealing enhancer.

[0027] Preferably, the six-membered heterocyclic compound is selected from at least one of pyridine, pyrimidine, pyrazine or their derivatives, and is used to enhance the sealing performance and chemical resistance of the adhesive.

[0028] Preferably, the diamine compound is a thiodiamine compound, in particular dimethylthiotoluenediamine, which acts synergistically with the six-membered heterocyclic compound to enhance the elasticity and tear strength of the adhesive.

[0029] Preferably, the antioxidant is an aromatic amine antioxidant and / or a hindered phenol antioxidant, which works together with the six-membered heterocyclic compound to improve the weather resistance and thermal stability of the adhesive.

[0030] Preferably, the nano-modified inert mineral is an inert mineral nanopowder or an inert mineral nanofiber, specifically a mixture of one or more of carbon, silicon, calcium, magnesium, aluminum, barium and inert silicates, combined with a six-membered heterocyclic compound to enhance the adhesion and temperature resistance of the adhesive.

[0031] Preferably, the mixture of condensed polycyclic aromatic compounds is purified asphalt, and the purification method is one of vacuum distillation, high-temperature reduced pressure distillation or rectification, which together with the six-membered heterocyclic compound improves the chemical corrosion resistance of the adhesive.

[0032] Preferably, the acrylic polymer is a polymer obtained by polymerizing one or more of acrylic acid and acrylate monomers, or a low molecular weight liquid petroleum resin with a number average molecular weight of 60 to 1500, which is combined with a six-membered heterocyclic compound to optimize the rheological properties and curing speed of the adhesive.

[0033] A method for preparing a six-membered heterocyclic compound sealing material, comprising the following steps when preparing component A:

[0034] S1001: Dehydrating the polyether polyol and / or polyester to remove moisture therein to ensure smooth progress of subsequent reactions;

[0035] S1002: using an isocyanate compound, including an aliphatic isocyanate compound and / or an aromatic isocyanate compound, or one or a mixture of toluene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate, to prepolymerize the dehydrated polyether polyol and / or polyester;

[0036] S1003: The reaction is carried out in a high-pressure reactor at a reaction temperature of 120-150° C. and a prepolymerization time of 5-8 hours to obtain a mixture of polyether isocyanate adducts and / or polyester isocyanate adducts, wherein the mass percentage of the isocyanate compound is 1.5-12% and the degree of branching is 2-4.

[0037] Preferably, a method for preparing a six-membered heterocyclic compound sealing material comprises the following steps when preparing component B:

[0038] S2001: Mix and stir the raw materials of component B in proportion at a temperature range of 8-35°C until uniform. Component B includes: 2-15 parts of a diamine compound, 0.1-5 parts of aziridine, 0.2-5 parts of an antioxidant, 0.1-3 parts of a defoaming agent, 0.2-4 parts of a coupling agent, 5-40 parts of a nano-modified inert mineral, 5-75 parts of a mixture of fused polycyclic aromatic compounds, 5-55 parts of an acrylic polymer, and 0.5-10 parts of a six-membered heterocyclic compound as a sealing enhancer.

[0039] S2002: During the mixing process, the six-membered heterocyclic compound is added at the final stage of mixing the raw materials of component B.

[0040] Preferably, the preparation of the sealing material includes the following steps:

[0041] S3001: Mix the prepared component A and component B in a volume ratio of 1:(0.5-3) and stir evenly to obtain a six-membered heterocyclic compound sealing material. The sealing material has a viscosity of 85-95 KU at 25° C. and has the best performance.

[0042] S3002: The usable time after sizing is within 30-90 minutes;

[0043] S3003: It takes 48 hours to reach maximum strength. After curing, it forms a sealing layer with excellent elasticity, tear strength, excellent adhesion and temperature resistance.

[0044] Example 1

[0045] A method for preparing a six-membered heterocyclic compound sealing material comprises the following steps:

[0046] (1) Prepare the following raw materials:

[0047] Component A: a mixture of a polyether isocyanate adduct and a polyester isocyanate adduct with a branching degree of 2-4 and an isocyanate mass percentage of 1.5-12%, and a viscosity of 75-105 KU.

[0048] Component B: 10 parts of dimethylthiotoluene diamine, 2 parts of aziridine auxiliary cross-linking agent, 1 part of antioxidant 1010, 2 parts of fluorosilicone defoaming agent, 2 parts of siloxane, 20 parts of talc powder, 50 parts of purified asphalt, 20 parts of butyl acrylate polymer (molecular weight of 1000), and 3 parts of pyridine as a six-membered heterocyclic compound sealing enhancer.

[0049] By volume ratio, component A: component B = 1:1.

[0050] (2) Specific preparation process:

[0051] Preparation of component A: After dehydrating the prefabricated ethylene terephthalate polyester and polyether polyol compounds using a high-temperature reactor, prepolymerization is carried out using an isocyanate compound as another monomer to obtain a mixture of a polyether isocyanate adduct and a polyester isocyanate adduct containing 1.5-12% of a high degree of branching.

[0052] Preparation of component B: Mix and stir the raw materials of component B in a high-speed disperser, and add pyridine in the final stage. If needed, ball milling or sand milling can also be used for grinding and dispersion, ensuring that the dispersion temperature is 8-35°C.

[0053] The applications of this six-membered heterocyclic compound sealing material are:

[0054] Substrate pretreatment: Various pretreatment methods can be used, such as sandblasting or sandpaper polishing, to form a rough surface. If necessary, specific primers or other forms of surface treatment can be used to achieve the desired effect. However, cleaning and dust removal should be carried out according to the surface condition. There should be no residual oil or moisture on the surface before construction.

[0055] Construction process: The product contains two components A / B. The exact proportion should be made according to the product instructions. Generally, component A is added to component B. After mixing, mechanical stirring is carried out for 2-5 minutes. After mixing evenly, it can be applied by brushing or scraping.

[0056] The six-membered heterocyclic compound sealing material with good performance described in the present invention can achieve bonding between various material bodies or between different materials in various occasions through different product combinations and ratios.

[0057] Example 2

[0058] A method for preparing a six-membered heterocyclic compound sealing material is the same as that in Example 1, except that it includes the following steps:

[0059] (1) Prepare the following raw materials:

[0060] Component A: a mixture of a polyether isocyanate adduct and a polyester isocyanate adduct with a branching degree of 2-4 and an isocyanate mass percentage of 1.5-12%, and a viscosity of 75-105 KU.

[0061] Component B: 15 parts of a representative crosslinker diamine compound, specifically dimethylthiotoluene diamine in this embodiment, 5 parts of aziridine auxiliary crosslinking agent, 2 parts of antioxidant 1076, 1 part of a fluorosilicone defoaming agent, 2 parts of a silane coupling agent, 5 parts of carbon fiber, 5 parts of magnesium powder, 20 parts of a mixture of condensed polycyclic aromatic compounds and 5 parts of pyrimidine as a six-membered heterocyclic compound sealing enhancer, which is purified asphalt in this embodiment, and 10 parts of C5 petroleum resin, which is butyl acrylate polymer in this embodiment.

[0062] By volume ratio, component A: component B = 1:1.

[0063] (2) Application and testing:

[0064] The six-membered heterocyclic compound sealing material prepared in this embodiment is used for bonding rubber and steel, and is mainly used in mechanical flexible connection and vibration reduction, and is tested.

[0065] Example 3

[0066] A method for preparing a six-membered heterocyclic compound sealing material is the same as that in Example 1, except that it includes the following steps:

[0067] (1) Prepare the following raw materials:

[0068] Component A: a mixture of a polyether isocyanate adduct and a polyester isocyanate adduct with a branching degree of 2-4 and an isocyanate mass percentage of 1.5-12%, and a viscosity of 75-105 KU.

[0069] Component B: 2 parts of a representative crosslinker diamine compound, specifically dimethylthiotoluene diamine in this embodiment, 0.5 parts of aziridine auxiliary crosslinking agent, 0.8 parts of aromatic amine antioxidant, 0.1 parts of fluorosilicone defoaming agent, 0.6 parts of titanate coupling agent, 5 parts of a mixture of silicon, calcium, magnesium, aluminum, and barium, with a mixing ratio of 1:1:1:1:1, 5 parts of a mixture of condensed polycyclic aromatic compounds, which in this embodiment is purified asphalt, 5 parts of acrylic polymers and 2 parts of pyrazine as a six-membered heterocyclic compound sealing enhancer, which in this embodiment is polyacrylic acid with a molecular weight of 100.

[0070] By volume ratio, component A: component B = 1:0.5.

[0071] (2) Application and testing:

[0072] The six-membered heterocyclic compound sealing material prepared in this embodiment is used for bonding rubber to rubber, and its elasticity and tensile properties after bonding are maintained, and the sealing material is tested.

[0073] Example 4

[0074] A method for preparing a six-membered heterocyclic compound sealing material is the same as that in Example 1, except that it includes the following steps:

[0075] (1) Prepare the following raw materials:

[0076] Component A: a mixture of a polyether isocyanate adduct and a polyester isocyanate adduct with a branching degree of 2-4 and an isocyanate mass percentage of 1.5-12%, and a viscosity of 75-105 KU.

[0077] Component B: 15 parts of a representative crosslinker diamine compound, specifically dimethylthiotoluene diamine in this embodiment, 5 parts of aziridine auxiliary crosslinking agent, 1 part of an aromatic amine antioxidant, 2 parts of antioxidant 1076, 3 parts of a fluorosilicone defoaming agent, 2 parts of a silane coupling agent, 2 parts of a titanate coupling agent, 20 parts of talc, 70 parts of a mixture of condensed polycyclic aromatic compounds and 4 parts of pyridine and its derivatives as a six-membered heterocyclic compound sealing enhancer, in this embodiment it is purified asphalt, 50 parts of an acrylic polymer, in this embodiment it is a methyl acrylate polymer with a molecular weight of 1200.

[0078] (2) Application and testing:

[0079] The six-membered heterocyclic compound sealing material prepared in this embodiment is used for bonding rubber and plastic materials, and is mainly used in anti-corrosion and sealing aspects, and is tested.

[0080] Example 5

[0081] A method for preparing a six-membered heterocyclic compound sealing material is the same as that in Example 1, except that it includes the following steps:

[0082] (1) Prepare the following raw materials:

[0083] Component A: a mixture of a polyether isocyanate adduct and a polyester isocyanate adduct with a branching degree of 2-4 and an isocyanate mass percentage of 1.5-12%, and a viscosity of 75-105 KU.

[0084] Component B: 10 parts of a representative crosslinker diamine compound, specifically dimethylthiotoluene diamine in this embodiment, 1 part of an aziridine auxiliary crosslinker, 0.2 parts of an aromatic amine antioxidant, 1.2 parts of a fluorosilicone defoaming agent, 1 part of a titanate coupling agent, 10 parts of carbon fiber, 10 parts of silicon, 10 parts of metallic magnesium, 50 parts of a mixture of condensed polycyclic aromatic compounds and 6 parts of pyrimidine and its derivatives as a six-membered heterocyclic compound sealing enhancer, in this embodiment, purified asphalt, 10 parts of an acrylic polymer, in this embodiment, a mixture of butyl acrylate polymer and C5 petroleum resin, with a mixing ratio of 1:1.

[0085] (2) Application and testing:

[0086] The six-membered heterocyclic compound sealing material prepared in this embodiment is used for bonding fibers and leather materials, mainly for bonding leather and various fibers and cloth materials, and is tested.

[0087] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge of those skilled in the art without departing from the spirit of the present invention.

Claims

1. A six-membered heterocyclic compound sealing material; characterized in that: The invention comprises a raw material component A and a raw material component B; the volume ratio of component A:component B is 1:(0.5-3); wherein component A is a mixture of polyether isocyanate adducts and / or polyester isocyanate adducts, the branching degree of which is 2-4, and the mass percentage of isocyanate in the mixture of polyether isocyanate adducts and / or polyester isocyanate adducts is 1.5-12%; and component B comprises the following raw materials and their proportions: 2-15 parts of a diamine compound, 0.1-5 parts of aziridine, 0.2-5 parts of an antioxidant, 0.1-3 parts of a defoaming agent, 0.2-4 parts of a coupling agent, 5-40 parts of a nano-modified inert mineral, 5-75 parts of a mixture of condensed polycyclic aromatic compounds, 5-55 parts of an acrylic polymer, and 0.5-10 parts of a six-membered heterocyclic compound as a sealing enhancer.

2. The six-membered heterocyclic compound sealing material according to claim 1, characterized in that: The six-membered heterocyclic compound is selected from pyridine, pyrimidine, pyrazine or derivatives thereof.

3. The six-membered heterocyclic compound sealing material according to claim 2, characterized in that: The diamine compound is a thiodiamine compound.

4. The six-membered heterocyclic compound sealing material according to claim 3, characterized in that: The antioxidant is an aromatic amine antioxidant and / or a hindered phenol antioxidant.

5. The six-membered heterocyclic compound sealing material according to claim 4, characterized in that: The nano-modified inert mineral is inert mineral nanopowder or inert mineral nanofiber.

6. The six-membered heterocyclic compound sealing material according to claim 5, characterized in that: The mixture of condensed polycyclic aromatic compounds is purified asphalt, and the purification method is one of vacuum distillation, high-temperature reduced-pressure distillation or rectification.

7. The six-membered heterocyclic compound sealing material according to claim 6, characterized in that: Acrylic polymers are polymers obtained by polymerizing one or more of acrylic acid, acrylates, or low molecular weight liquid petroleum resins with a number average molecular weight of 60 to 1500. They are combined with six-membered heterocyclic compounds to optimize the rheological properties and curing speed of the adhesive.

8. The six-membered heterocyclic compound sealing material according to claim 7, characterized in that: The preparation of component A includes the following steps: S1001: Dehydrating the polyether polyol and / or polyester to remove moisture therein to ensure smooth progress of subsequent reactions; S1002: using an isocyanate compound, including an aliphatic isocyanate compound and / or an aromatic isocyanate compound, or one or a mixture of toluene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate, to prepolymerize the dehydrated polyether polyol and / or polyester; S1003: The reaction is carried out in a high-pressure reactor at a reaction temperature of 120-150° C. and a prepolymerization time of 5-8 hours to obtain a mixture of polyether isocyanate adducts and / or polyester isocyanate adducts, wherein the mass percentage of the isocyanate compound is 1.5-12% and the degree of branching is 2-4.

9. The six-membered heterocyclic compound sealing material according to claim 8, characterized in that: The preparation of component B includes the following steps: S2001: Mix and stir the raw materials of component B in proportion at a temperature range of 8-35°C until uniform. Component B includes: 2-15 parts of a diamine compound, 0.1-5 parts of aziridine, 0.2-5 parts of an antioxidant, 0.1-3 parts of a defoaming agent, 0.2-4 parts of a coupling agent, 5-40 parts of a nano-modified inert mineral, 5-75 parts of a mixture of fused polycyclic aromatic compounds, 5-55 parts of an acrylic polymer, and 0.5-10 parts of a six-membered heterocyclic compound as a sealing enhancer. S2002: During the mixing process, the six-membered heterocyclic compound is added at the final stage of mixing the raw materials of component B.

10. A method for preparing a six-membered heterocyclic compound sealing material, characterized in that Comprising a six-membered heterocyclic compound sealing material according to claim 9: when preparing the sealing material, The following steps are involved: S3001: Mix the prepared component A and component B in a volume ratio of 1:(0.5-3) and stir evenly to obtain a six-membered heterocyclic compound sealing material. The sealing material has a viscosity of 85-95 KU at 25° C. and has the best performance. S3002: The usable time after sizing is within 30-90 minutes; S3003: It takes 48 hours to reach maximum strength. After curing, it forms a sealing layer with excellent elasticity, tear strength, excellent adhesion and temperature resistance.

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