阅读说明：本技术 一种用于电缆的高强度复合填充材料及其生产方法 (High-strength composite filling material for cable and production method thereof ) 是由 戴超 戴文秉 戴玉 戴章 戴文忠 于 2020-04-14 设计创作，主要内容包括：本发明公开了一种用于电缆的高强度复合填充材料及其生产方法,通过耐冲击层和轻质层的交替层叠粘结形成若干三明治夹心结构单元,外层的耐冲击层采用高强度橡胶填充材料使得复合材料整体具备较好的力学性能,且具有较强的耐冲击性能,作为芯层的轻质层也有效降低了材料整体的重量,在高耐冲击性能下满足强量化要求。粘结层中采用高分子粘结材料聚芳醚腈搭配单层纤维织物可有效提高多层复合填充材料的整体抗蠕变性能。在单层纤维织物的选材上选用高强度耐冲击纤维材质可进一步强化复合材料的耐冲击性。微米级中空玻璃微珠和微米级短切纤维的合理配比可以显著提高轻质层强度,满足轻量化的同时进一步提高复合填充材料的整体强度。(The invention discloses a high-strength composite filling material for cables and a production method thereof. The bonding layer adopts a high polymer bonding material poly (arylene ether nitrile) matched with the single-layer fiber fabric, so that the overall creep resistance of the multilayer composite filling material can be effectively improved. The impact resistance of the composite material can be further enhanced by selecting a high-strength impact-resistant fiber material on the material of the single-layer fiber fabric. The reasonable proportion of the micron-sized hollow glass beads and the micron-sized chopped fibers can obviously improve the strength of the light layer, and further improve the overall strength of the composite filling material while meeting the requirement of light weight.)

1. A high-strength composite filling material is characterized by being formed by alternately laminating and bonding a plurality of light layers and a plurality of impact-resistant layers, wherein the upper surface layer and the lower surface layer of the composite filling material are the impact-resistant layers; the light layer is formed by mould pressing of micron-sized hollow glass beads and micron-sized chopped fiber composite filling epoxy resin matrixes, and the impact-resistant layer is prepared by filling silicon rubber with nano-fillers.

2. A high strength composite filler material as claimed in claim 1, wherein: the light layer and the impact-resistant layer are extruded and bonded through a single-layer fiber fabric dipped with the polyaryl ether nitrile.

3. A high strength composite filler material as claimed in claim 2, wherein: the fiber fabric is Kevlar fiber fabric or glass fiber fabric or nylon fiber fabric.

4. A high strength composite filler material as claimed in claim 1, wherein: the nano filler is one of silicon nitride, white carbon black or hexagonal boron nitride nano powder, and the chopped fiber is one of chopped acrylic fiber, chopped glass fiber or chopped nylon fiber.

5. A high strength composite filler material as claimed in claim 1, wherein: the epoxy resin matrix is formed by polymerizing and curing epoxy vinyl resin.

6. A method for producing the high-strength composite filling material as claimed in any one of claims 1 to 5, which is characterized by comprising the following steps:

(A) preparing an impact resistant layer: firstly, placing nano filler in a vacuum oven at 80 ℃ for drying treatment for 4 hours, then mixing 100 parts by weight of methyl vinyl silicone rubber, 50 parts by weight of nano filler and 6 parts by weight of silicone oil according to the proportion, mixing for 15 minutes at 105 ℃ by an internal mixer, then cooling the mixed rubber to room temperature, mixing 2 parts by weight of vulcanizing agent DCP by a double-roll open mill at room temperature, mixing for 15 minutes, and standing for 48 hours to obtain a plate-shaped impact-resistant layer;

(B) the light layer is prepared by the following steps: pre-stirring the resin and the initiator at normal temperature according to the mixture ratio of 100phr of epoxy vinyl resin and 2phr of methyl ethyl ketone peroxide; then adding 0.4phr of cobalt naphthenate into the mixing device, stirring for 2min, and standing for later use; adding 40phr of composite powder consisting of micron-sized hollow glass beads and micron-sized chopped fibers, adopting a mixing mode of adding and stirring, wherein the stirring time is 30min, and after the stirring is finished, carrying out vacuum defoaming treatment on the premix to obtain the premix; putting the premix into a mold with the surface coated with a release agent, pressurizing and molding, curing according to a curing process, and cooling and demolding to obtain a plate-shaped light layer;

(C) composite bonding of the impact-resistant layer and the lightweight layer: the impact-resistant layers and the light-weight layers are arranged in a crossed and laminated mode, the upper surface layer and the lower surface layer are impact-resistant layers, single-layer fiber fabrics dipped and coated with poly (arylene ether nitrile) are laid between the layers, constant-pressure bonding is carried out for 1 hour at the temperature of 80 ℃, and the pressure is removed after the materials are cooled to room temperature; and fully vulcanizing for 10min by using a flat vulcanizing machine under the conditions of 165 ℃ and 10MPa to obtain the high-strength composite filling material.

7. The method for preparing a high-strength composite filling material according to claim 6, wherein: the weight ratio of the micron-sized hollow glass microspheres to the micron-sized chopped fibers in the composite powder is 7: 1.

Technical Field

The invention relates to the field of composite filling materials, in particular to a high-strength composite filling material for cables and a production method thereof.

Background

With the rapid development of the technical fields of aerospace, ocean exploration, engineering and the like in China, on the premise of ensuring the safety and reliability of cables with special purposes, urgent needs are provided for the lightweight of materials, and the materials are expected to have the characteristic of low density while ensuring high strength and insulativity. Although light-weight materials, such as plastic foams, glass fiber reinforced composites, and carbon fiber reinforced composites, satisfy the engineering requirements of light weight to some extent, there are many disadvantages to be improved and enhanced. The plastic foam has the characteristic of low density, but the strength of the plastic foam as a cable sheath is obviously insufficient; glass fiber reinforced composite materials and carbon fiber reinforced composite materials have the characteristic of high strength, but the density of the glass fiber reinforced composite materials is large, and the requirements of light weight and insulativity cannot be met, so that the glass fiber reinforced composite materials and the carbon fiber reinforced composite materials cannot meet the comprehensive performance requirements of related fields on high strength, safety and low density.

The filler material generally means a solid material added as an essential component in synthetic resin or rubber to change its properties or reduce its cost. Both inorganic and organic. Reinforcing agents, such as carbon black, white carbon black, china clay, precipitated calcium carbonate, are commonly used in the rubber industry to improve tensile strength, hardness, abrasion resistance, and flex resistance. Wood flour, cotton fiber, paper, cloth, asbestos, clay, etc. are commonly used in the plastics industry to improve their mechanical properties, etc., and mica, graphite, etc. are used to improve their electrical properties, etc.

At present, in order to ensure that a resin material has certain strength and lower density, the overall density of the material can be reduced by adopting a method for improving the filling rate of hollow glass beads, the hollow glass beads are dispersed in a resin matrix, so that the improvement of the mechanical strength of a resin crosslinking system is not helpful, and even the overall strength of the material can be reduced under high filling rate, therefore, the composite filling material can meet the requirement of light weight and cannot give consideration to the impact resistance of the material, the composite filling material is easy to break and reduce the mechanical property under the action of high-strength periodic impact force, other rubber filling materials can ensure the strength of the material, but have the problems of gradual deterioration of creep resistance along with the migration of time, and the weight and the thickness are obviously higher than those of the resin glass bead filling material under the same strength, so that the light weight cannot be taken into consideration.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: how to enable the composite filling material to have high strength and light weight through a laminated structure of different filling materials and effectively resist creep under the condition of high impact resistance.

In order to solve the technical problems, the invention provides the following technical scheme:

a high-strength composite filling material is formed by alternately laminating and bonding a plurality of light layers and a plurality of impact-resistant layers, wherein the upper surface layer and the lower surface layer of the composite filling material are both impact-resistant layers; the light layer is formed by mould pressing of micron-sized hollow glass beads and micron-sized chopped fiber composite filling epoxy resin matrixes, and the impact-resistant layer is prepared by filling silicon rubber with nano-fillers.

Preferably, the lightweight layer and the impact resistant layer are extrusion bonded by a single layer of fiber fabric dip-coated with poly (arylene ether nitrile).

Preferably, the fiber fabric is a Kevlar fiber fabric or a glass fiber fabric or a nylon fiber fabric.

Preferably, the nano filler is one of silicon nitride, white carbon black or hexagonal boron nitride nano powder, and the chopped fiber is one of chopped acrylic fiber, chopped glass fiber or chopped nylon fiber.

Preferably, the epoxy resin matrix is formed by polymerization and curing of epoxy vinyl resin.

The production method of the high-strength composite filling material comprises the following specific steps:

(A) preparing an impact resistant layer: firstly, placing nano filler in a vacuum oven at 80 ℃ for drying treatment for 4 hours, then mixing 100 parts by weight of methyl vinyl silicone rubber, 50 parts by weight of nano filler and 6 parts by weight of silicone oil according to the proportion, mixing for 15 minutes at 105 ℃ by an internal mixer, then cooling the mixed rubber to room temperature, mixing 2 parts by weight of vulcanizing agent DCP by a double-roll open mill at room temperature, mixing for 15 minutes, and standing for 48 hours to obtain a plate-shaped impact-resistant layer;

(B) the light layer is prepared by the following steps: pre-stirring the resin and the initiator at normal temperature according to the mixture ratio of 100phr of epoxy vinyl resin and 2phr of methyl ethyl ketone peroxide; then adding 0.4phr of cobalt naphthenate into the mixing device, stirring for 2min, and standing for later use; adding 40phr of composite powder consisting of micron-sized hollow glass beads and micron-sized chopped fibers, adopting a mixing mode of adding and stirring, wherein the stirring time is 30min, and after the stirring is finished, carrying out vacuum defoaming treatment on the premix to obtain the premix; putting the premix into a mold with the surface coated with a release agent, pressurizing and molding, curing according to a curing process, and cooling and demolding to obtain a plate-shaped light layer;

(C) composite bonding of the impact-resistant layer and the lightweight layer: the impact-resistant layers and the light-weight layers are arranged in a crossed and laminated mode, the upper surface layer and the lower surface layer are impact-resistant layers, single-layer fiber fabrics dipped and coated with poly (arylene ether nitrile) are laid between the layers, constant-pressure bonding is carried out for 1 hour at the temperature of 80 ℃, and the pressure is removed after the materials are cooled to room temperature; and fully vulcanizing for 10min by using a flat vulcanizing machine under the conditions of 165 ℃ and 10MPa to obtain the high-strength composite filling material.

Preferably, the weight ratio of the micron-sized hollow glass microspheres to the micron-sized chopped fibers in the composite powder is 7: 1.

The invention has the following beneficial effects:

1. according to the invention, the impact-resistant layers and the light-weight layers are alternately laminated and bonded to form a plurality of sandwich structure units, the impact-resistant layer on the outer layer adopts a high-strength rubber filling material, so that the composite material has better mechanical property and stronger impact resistance, the light-weight layer as the core layer also effectively reduces the weight of the whole material, and the requirement of strength and quantification is met under the high impact resistance.

2. The bonding layer adopts a high polymer bonding material poly (arylene ether nitrile) matched with the single-layer fiber fabric, so that the overall creep resistance of the multilayer composite filling material can be effectively improved. The impact resistance of the composite material can be further enhanced by selecting a high-strength impact-resistant fiber material on the material of the single-layer fiber fabric.

3. The reasonable proportion of the micron-sized hollow glass beads and the micron-sized chopped fibers can obviously improve the strength of the light layer, and further improve the overall strength of the composite filling material while meeting the requirement of light weight.

Drawings

Fig. 1 is a schematic view of an alternate stacking configuration.

Wherein A is an impact resistant layer, and B is a light layer.

Detailed Description

The following examples are included to provide further detailed description of the present invention and to provide those skilled in the art with a more complete, concise, and exact understanding of the principles and spirit of the invention.