Novel formula of hovercraft apron adhesive tape coating

Abstract

The invention relates to the technical field of hovercraft apron adhesive tape coating, and discloses a novel formula of hovercraft apron adhesive tape coating. A semi-reinforcing carbon black and high-structure reinforcing carbon black combined system, an anti-aging system formed by combining a physical anti-aging agent and a chemical anti-aging agent, a sulfur vulcanization system, a tackifier and other matching systems are used as auxiliary materials. Through the comprehensive scheme of improving the rubber formula and coating the anti-aging elastic coating on the outer surface of the flexible apron rubber coating layer, on the premise of not generating negative effects on the existing materials and products, the anti-aging elastic coating is formed; the anti-aging performance of the rubber material of the flexible apron rubber coating layer and the anti-aging elastic coating coated on the outer surface of the flexible apron rubber coating layer are researched, so that the problem that the exposed surface of the flexible apron rubber coating layer is cracked after the QDC sails and parks for a long time is solved, and the overall performance of the product is improved.

Description

Technical Field

[0001] The invention relates to the technical field of rubber coating of hovercraft apron tape, in particular to a novel formula of rubber coating of hovercraft apron tape. Background Art

[0002] The existing flexible apron is the main component of QDC, which is made of unsaturated diene rubber material and fabric skeleton material. The sea area where QDC usually sails and anchors is located in the low-latitude area, with long sunshine time, high direct sunlight intensity, high ambient temperature, high concentration of ultraviolet rays and ozone, humid air and high salt content. The combined effect of these natural conditions will cause the unsaturated diene rubber as the main material of the flexible apron coating to age, causing the rubber material to become sticky and cracked on the surface.

[0003] Therefore, in order to solve the problem of stickiness and cracking of the exposed surface of the rubber coating of the apron due to long QDC navigation and berthing time, this project will carry out research on the anti-aging properties of the rubber material of the flexible apron coating and the protective coating on the outer surface of the coating. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in order to overcome the above problems, a new formula for the adhesive coating of the hovercraft apron tape is provided, which solves the above problems.

[0005] The present invention solves the technical problem by adopting the following technical solutions:

[0006] Apron tape is a composite material (tape) formed by coating rubber on both sides of the skeleton fabric material, calendering and vulcanization. The rubber coating on the surface of the tape is an important part of the apron tape structure, which plays a certain role in protecting the skeleton fabric material. In addition, it is of great significance to isolate sunlight, ultraviolet rays, and water pressure, and maintain the stable working state of the QDC apron overall inflatable cushion.

[0007] The formula of the apron covering material used in this project mainly uses natural rubber / butadiene rubber as the base material, supplemented by a combination of semi-reinforced carbon black and high-structure reinforced carbon black, an anti-aging system combining physical antioxidants and chemical antioxidants, a sulfur vulcanization system, and a tackifier system. As QDC is exposed to high temperature, light, ultraviolet rays, ozone and other environments for a long time, the apron tape covering material is prone to unsaturated bond breakage and weather aging. At the same time, due to the long-term sun exposure, some of the compounding agents will also seep into the rubber surface to form sticky migration pollutants.

[0008] Considering that cracking and aging of apron tape will affect the service life of aprons, this project conducts research from two aspects: formula optimization of apron tape coating materials and anti-aging coating, in order to obtain a longer service life of aprons.

[0009] The advantages and positive effects of the present invention are: through the comprehensive solution of improving the rubber formula and coating the outer surface of the flexible apron rubber layer with an anti-aging elastic coating, without having a negative impact on existing materials and products, research on the anti-aging performance of the rubber material of the flexible apron rubber layer and coating the outer surface of the flexible apron rubber layer with an anti-aging elastic coating is carried out to solve the problem of cracking of the exposed surface of the flexible apron rubber layer after QDC sailing and mooring for a long time, so as to improve the overall performance of the product and lay a foundation for product upgrading. DETAILED DESCRIPTION

[0010] The present invention will now be described in further detail.

[0011] The embodiments of the present invention are further described below:

[0012] The rubber material of the rubber coating layer mainly includes a raw rubber matrix, a reinforcing filling system, an antioxidant system, a vulcanization accelerating system, a tackifier system and the like.

[0013] 1) Raw rubber matrix

[0014] Unsaturated diene rubbers such as natural rubber and butadiene rubber have good comprehensive properties, such as good elasticity, high strength, low heat generation, good flex resistance, low hysteresis loss and other mechanical properties, as well as process properties such as mixing, extrusion, calendering, bonding and vulcanization forming. They are widely used in the manufacture of rubber products or pure rubber products with high dynamic performance requirements. Therefore, it has great advantages as a rubber material for QDC flexible aprons. However, the unsaturated double bonds on the main chain of unsaturated diene rubber molecules are unstable and are more likely to react and break under the influence of high temperature, light, ultraviolet rays, ozone and other environments, causing them to weather aging.

[0015] Natural rubber (NR) is a natural polymer compound with polyisoprene as the main component. Its rubber hydrocarbon (polyisoprene) content is more than 90%, and it also contains a small amount of plant protein, fatty acid, sugar and ash. NR has excellent mechanical properties and is a self-reinforcing rubber. It still has high strength without or with little filler reinforcement. In addition, it has good elasticity, cold resistance, water resistance and dynamic mechanical (fatigue, heat generation, hysteresis) properties, and excellent processing performance such as mixing, calendering, self-adhesion, mutual adhesion and vulcanization. However, its heat resistance, ozone resistance and weather resistance are poor, and NR is usually modified or used in combination with other raw rubbers to make up for these deficiencies.

[0016] Butadiene rubber (BR) is a synthetic rubber polymerized with high cis-butadiene as a monomer. Due to its molecular structure, BR has high elasticity, especially the best low-temperature elasticity, and its glass transition temperature is about -105°C, which is better than the low-temperature elasticity of natural rubber (glass transition temperature -75°C). It even has good rubber elasticity at -50°C. In addition, BR has good wear resistance and flexural resistance, low hysteresis loss and heat generation, and has great advantages in dynamic working conditions with repeated deformation.

[0017] According to the above analysis and previous product usage, this study will adopt the NR and BR combined system, and through experiments, develop a rubber material suitable for the rubber layer of the project product (rubber apron).

[0018] 2) Reinforcement filling system

[0019] Considering the characteristics of the project products, mainly from the aspects of improving the dynamic fatigue performance, wear resistance, bonding and calendering process performance of rubber, in order to obtain fatigue resistance and flexural resistance rubber with good comprehensive performance, carbon black with larger particle size (low structure carbon black, such as N-770 or N-774, i.e.: semi-reinforced carbon black) and high structure reinforced carbon black (such as N-330, i.e.: high wear-resistant carbon black) should be used in combination. At the same time, using a small amount of precipitated white carbon black will also have a certain effect on improving the bonding performance.

[0020] 3) Antioxidant system

[0021] The heat aging, ozone aging, weather aging and dynamic flexural aging of rubber will greatly reduce the working life of the project product (apron tape), so the rubber antioxidant system is one of the key research objects of this project. This project will use antioxidant A (improve weather aging, comprehensive antioxidant), antioxidant 4010NA (improve dynamic fatigue, ozone and weather aging performance), antioxidant MB (improve heat oxygen aging performance), antioxidant RD (improve water resistance), antioxidant BLE (comprehensive antioxidant, effective for improving the heat oxygen resistance, ozone resistance, weather resistance and flexural resistance of rubber) and other antioxidants to seek the best combination. In order to reduce the impact of dirt on the bonding effect, try not to use or use less physical antioxidants (microcrystalline wax, etc.) in the formula, and focus on using antioxidants that resist heat oxygen aging, ozone aging, day aging and improve water resistance.

[0022] 4) Vulcanization accelerator system

[0023] The dynamic mechanical properties of vulcanized rubber are closely related to the crosslinking density and the type of crosslinking bonds. A moderate increase in the degree of vulcanization of rubber (i.e., an increase in crosslinking density) will increase its glass transition temperature Tg. In the elastic region above Tg, the equilibrium elastic modulus and dynamic loss factor tgδ of the vulcanized rubber also increase with the increase in crosslinking density. For diene rubbers such as NR and BR, sulfur-vulcanized rubbers mainly have polysulfide bonds, disulfide bonds, and monosulfide bonds. With different vulcanization systems (such as traditional vulcanization CV system, semi-effective vulcanization SEV, and effective EV vulcanization system), the relative concentrations of various crosslinking bonds and the "bond lengths" of the crosslinking bonds are also different, which will have different degrees of influence on the dynamic mechanical properties of the vulcanized rubber.

[0024] According to the actual use conditions (dynamic bending) and process technology conditions (calendering, laminating and forming) of the project products, this study intends to use a sulfur vulcanization system (CV vulcanization system) in the formulation of diene rubber such as NR and BR as the raw rubber matrix. Sulfur is used as the vulcanizer, and the accelerator is mainly the post-effective accelerator CZ and M, and a small amount of ultra-speed accelerator TMTD is added to improve the vulcanization performance. At the same time, in order to ensure the storage stability of the rubber during the turnover process of the processing procedure, a scorch retarder is also added (to prevent early vulcanization).

[0025] 5) Tackifier system

[0026] For the project products, good bonding between the rubber coating and the skeleton material is the key to ensure the product life and performance. Therefore, it is very important to carry out formula research on the tackifier system. In the formula test, it is planned to use a bonding system composed of resorcinol resin (RE resin), formaldehyde releaser (adhesive A: hexamethoxymethylpyrimidine), and white carbon black (i.e., meta-formaldehyde-white system) as the main bonding system. Similarly, considering that tackifiers such as solid coumarone resin, pine tar, and disproportionated rosin will migrate to the rubber surface under long-term strong sunlight, forming sticky pollutants, causing the rubber surface to become sticky, the amount of these compounding agents will be controlled as much as possible in the formula.

[0027] Based on the above formula design analysis, this project further carried out formula test research, referring to the basic performance of the previous apron product tape covering layer 4275 and 4285G, through the adjustment and optimization of the formula of antioxidants and viscosity-enhancing systems, focusing on comparison with the existing covering rubber, assessing the mechanical properties and aging resistance (thermal oxygen, ozone and ultraviolet aging) of the vulcanized tape. Technical indicators of the performance of the rubber material of the covering layer. At the same time, the newly developed rubber compound was tested for mixing process, calendering and laminating process, product bonding and molding, and product vulcanization process, assessing the production process of the rubber compound and its adaptability to subsequent calendering and laminating, product bonding and molding, and vulcanization processes.

[0028] It should be emphasized that the embodiments described in the present invention are illustrative rather than restrictive, and therefore the present invention is not limited to the embodiments described in the specific implementation manners. Any other implementation manners derived by those skilled in the art based on the technical solutions of the present invention also fall within the scope of protection of the present invention.

Claims

1. A new formula for the rubber coating of hovercraft apron tape, characterized by: It includes natural rubber (smoked sheet rubber), butadiene rubber, zinc oxide, stearic acid, and a scorch retarder, and the mass fraction ratio of the above component materials is natural rubber (smoked sheet rubber), butadiene rubber, zinc oxide, stearic acid, and a scorch retarder: 35%-42%: 15%-18%: 1.8%-3%: 1.8%-2.2%: 0.5%-0.8%.

2. The novel formula for coating the hovercraft apron with adhesive tape according to claim 1, characterized in that: The mass fraction ratio of the component materials, natural rubber (smoked rubber), butadiene rubber, zinc oxide, stearic acid and scorch retarder, is 40.46%: 17.34%: 2.89%: 1.73%: 0.58%.

3. A new formula for the rubber coating of hovercraft apron tape according to claim 2, characterized in that: Anti-aging agent A with a mass fraction of 0.45%-0.6% is also added, antioxidant 4010 with a mass fraction of 0.45%-0.6% is also added, antioxidant MB with a mass fraction of 0.45%-0.6% is also added, and antioxidant BLE with a mass fraction of 0.45%-0.6% is also added.

4. A new formula for the rubber coating of hovercraft apron tape according to claim 3, characterized in that: The mass fraction of antioxidant A is 0.58%, the mass fraction of antioxidant 4010 is 0.58%, the mass fraction of antioxidant MB is 0.58%, and the mass fraction of antioxidant BLE is 0.58%.

5. A new formula for the rubber coating of hovercraft apron tape according to claim 4, characterized in that: White oil, semi-reinforcing carbon black, 330 carbon black and RE resin are also added, and their mass fractions are 0.25%-0.6%, 5.2%-7%, 12.8%-15% and 2%-3% respectively.

6. A new formula for coating the hovercraft apron with adhesive tape according to claim 5, characterized in that: The mass fraction ratio of white oil, semi-reinforcing carbon black, 330 carbon black and RE resin is 0.58%:6.94%:14.45%:2.31%.

7. A new formula for coating the hovercraft apron with adhesive tape according to claim 6, characterized in that: Adhesive A, coumarone, pine tar, accelerator CZ (CBS), and sulfur are also added.

8. The novel formula for coating the hovercraft apron with adhesive tape according to claim 7, characterized in that: The mass fractions of the adhesive A, coumarone, pine tar, accelerator CZ (CBS), and sulfur are 2.31%: 2.31%: 3.47%: 0.58%: 1.73%.