CN201117317Y - Three-layer structure insulation composite material - Google Patents

Abstract

The utility model discloses a three-layer structure insulating composite material, the insulating composite material comprises a middle layer of polyester film, and the outer layers of inorganic ceramic fiber paper and polyaramid fiber paper are respectively provided on the upper and lower parts of the polyester film, and the layers are compounded with a heat-resistant adhesive. The utility model significantly improves the tensile strength of the inorganic ceramic fiber paper and effectively reduces the material cost of the soft insulating composite material, so it can be more economically applied to low-voltage motors, electrical appliances, and electronic transformer insulation systems with heat resistance grades F to H (155 to 180°C), and is an ideal substitute product for NMN insulating materials.

Description

Three-layer structure insulation composite material

technical field

The utility model relates to a three-layer structure insulation composite material, in particular to a three-layer structure insulation composite material applied to heat-resistant 155-180°C low-voltage motors, electrical appliances, dry-type transformers, and other products between grooves, phases or layers. Material.

Background technique

NMN NOMEX paper polyester film composite materials and NHN NOMEX paper polyimide film composite materials are generally used for inter-slot, interphase or interlayer insulation materials of existing F and H-class low-voltage motors, electrical appliances, transformers, and electric tools. NHN and MNM composite materials have excellent electrical insulation performance, high heat resistance and physical and mechanical properties due to the use of heat-resistant polyaramid fiber NOMEX paper produced by Dupont Company of the United States, but there are also deficiencies, such as dipping The amount of paint absorbed during varnish insulation treatment is not high; the price of polyaramid fiber NOMEX paper is expensive, which increases the cost of product materials. With the increasingly fierce competition in the motor and electrical appliance market, it is of great economic value to reduce the manufacturing cost of the product on the premise of ensuring the stable and reliable quality of the motor and electrical appliance.

Due to the composition containing 90% inorganic fibers, inorganic ceramic fiber paper (type CeQUIN) has outstanding heat resistance, heat resistance temperature up to 250 ° C, long insulation life, and is superior to NOMEX paper in terms of thermal conductivity and paint absorption capacity . However, the tensile strength and elongation of CeQUIN paper are lower than that of NOMEX paper, and the paper quality is relatively soft, which largely affects its wide use.

The prior art MNM flexible composite insulating material is formed by bonding upper and lower layers of NOMEX paper and a middle layer of polyester film, and its heat resistance grade is Class F (155°C).

Contents of the invention

The purpose of the utility model is to provide a three-layer structure insulating composite material, which is formed by using inorganic ceramic fiber paper as the substrate layer and polyester film, polyaramid fiber paper with good tensile strength and tear resistance. The three-layer soft insulating composite material significantly improves the tensile strength of the inorganic ceramic fiber paper and effectively reduces the material cost of the soft insulating composite material, so it can be more economically applied to heat-resistant grades F to H (155 to 180 ℃) low-voltage motors, electrical appliances, and electronic transformer insulation systems are ideal substitutes for NMN insulation materials.

The technical scheme of the utility model is: a three-layer structure insulating composite material, the insulating composite material includes a middle layer of polyester film, and the upper and lower layers of the polyester film are respectively provided with an outer layer of inorganic ceramic fiber paper and polyaramid fiber paper, and a layer of Composite with heat-resistant adhesive between layers.

The further technical solution of the utility model is: a three-layer structure insulating composite material, the insulating composite material includes a middle layer of polyester film, and the upper and lower layers of the polyester film are respectively provided with an outer layer of inorganic ceramic fiber paper and polyaramid fiber paper, Layers are compounded with heat-resistant adhesives; the inorganic ceramic fiber paper is made of unsintered aluminosilicate ceramic fibers, E glass fibers, inorganic fillers and high-temperature-resistant organic binders, which are made by papermaking and high-temperature rolling ; The polyester film is a polyethylene terephthalate film; the polyaramid fiber paper is made of polyaramid fibrids and chopped fibers as pulp, after non-oriented forming, calendering and other processes The organic synthetic fiber paper made; the heat-resistant adhesive is one of heat-resistant polyurethane adhesive, epoxy adhesive or other heat-resistant adhesives.

The utility model advantage is:

1. The utility model applies inorganic ceramic fiber paper to the insulation of motors and electrical appliances, which has the following advantages: the temperature rise of the motors and electrical appliances is low during use, which can effectively improve the continuous working time of the motors and electrical appliances and prolong the service life; the hygroscopicity is small, greatly It shortens the drying time before the workpiece is soaked in varnish for insulation treatment, and is suitable for long-term work in an environment with high relative humidity; the high paint absorption rate is conducive to improving the integrity of the insulation structure.

2. The utility model combines polyaramid fiber paper with good tensile strength and tear resistance and polyester film with inorganic ceramic fiber paper through a heat-resistant adhesive to form a three-layer composite structure, which significantly improves the performance of inorganic ceramic fiber. Therefore, it can be more economically applied to insulation systems of low-voltage motors, electrical appliances, and electronic transformers of heat-resistant grades F to H (155 to 180°C). It is an ideal substitute for NMN insulation materials.

3. The price of inorganic ceramic fiber paper is only 60% to 70% of that of polyaramid fiber paper. Such a three-layer structure can effectively reduce the material cost of soft insulating composite materials.

4. The structure of the utility model is reasonable, and the production process is basically the same as that of DMD and NMN soft composite insulating materials. It does not need to modify equipment, is simple and easy to operate, and can be mass-produced on ordinary composite machine equipment.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Among them: 1 inorganic ceramic fiber paper; 2 polyester film; 3 polyaramid fiber paper.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Embodiment: as shown in Fig. 1, a kind of insulating composite material of three-layer structure, described insulating composite material comprises polyester film 2 of middle layer, and polyester film 2 is respectively provided with inorganic ceramic fiber paper 1 and polyaramid fiber paper 3 Outer layers, laminated with heat-resistant adhesive between layers.

The inorganic ceramic fiber paper 1 is made of unsintered aluminosilicate ceramic fibers, E glass fibers, inorganic fillers and high-temperature resistant organic binders, and is made through papermaking and high-temperature rolling.

The polyester film 2 is a polyethylene terephthalate film.

The polyaramid fiber paper 3 is an organic synthetic fiber paper made by using polyaramid fibrids and chopped fibers as pulp and undergoing processes such as non-oriented forming and calendering.

The heat-resistant adhesive is one of heat-resistant polyurethane adhesive, epoxy adhesive or other heat-resistant adhesives.

Among them, the inorganic ceramic fiber paper adopts the CeQUIN paper produced by the American IPT company.

The production process of the utility model includes the following steps: After coating the polyester film with glue on both sides, it is dried in a drying tunnel at 110°C to remove the solvent, and at the same time, it is combined with the CeQUIN paper on the upper layer and the polyaramid fiber paper on the lower layer through composite rollers. Pressed and bonded together, after winding, post-processing, and slitting, it becomes a strip-shaped material.

The utility model applies the inorganic ceramic fiber paper to the insulation of motors and electrical appliances and has the following advantages: the temperature rise of the motors and electrical appliances is low during use, which can effectively improve the continuous working time of the motors and electrical appliances and prolong the service life; The drying time required before the workpiece dipping paint insulation treatment is suitable for long-term work in an environment with high relative humidity; the high paint absorption rate is conducive to improving the integrity of the insulation structure; the utility model has good tensile strength and tear resistance Aramid fiber paper and polyester film are bonded with inorganic ceramic fiber paper by heat-resistant adhesive to form a three-layer composite structure, which significantly improves the tensile strength of inorganic ceramic fiber paper, so it can be more economically applied to heat-resistant grades F～H grade (155～180℃) insulation systems for low-voltage motors, electrical appliances, and electronic transformers are ideal substitutes for NMN insulation materials; the price of inorganic ceramic fiber paper is only 60% to 70% of that of polyaramid fiber paper, so The three-layer structure can effectively reduce the material cost of flexible insulating composites.

Claims (1)

1. three-decker insulating composite material, it is characterized in that: described insulating composite material comprises intermediate layer polyester film (2), and the upper and lower surface of polyester film (2) is compounded with inorganic ceramic fibrous paper (1) and aromatic polyamide paper (3) with Heat-Resisting Adhesive respectively.

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