阅读说明：本技术 一种耐高温电机转子专用胶黏剂及其制备方法 (Special adhesive for high-temperature-resistant motor rotor and preparation method thereof ) 是由 李明臻 王军 田晓萍 李佑林 于 2019-12-06 设计创作，主要内容包括：本发明属于属于胶黏剂技术领域,尤其是一种耐高温电机转子专用胶黏剂及其制备方法,采用对苯二甲酸而烯丙基树脂对聚酯树脂进行改性,本发明耐高温电机转子专用胶黏剂常温固化表现出有机物的优异粘接性能；具有耐热性能,且可以实现常温固化,其制备方法中所用原料成本低,工艺简单,易于操作,制得的胶黏剂对固化环境适应性强,对操作要求低,使用方便,只需将胶粘剂各组分混合均匀后正常涂胶即可,适用于小型工业产品的结构粘接和补强粘接,如马达转子颈部、电机绕组线圈接头部位的粘接固定。(The invention belongs to the technical field of adhesives, and particularly relates to a high-temperature-resistant adhesive special for a motor rotor and a preparation method thereof, wherein terephthalic acid and allyl resin are adopted to modify polyester resin, and the high-temperature-resistant adhesive special for the motor rotor is cured at normal temperature to show excellent bonding performance of organic matters; the adhesive has the advantages of heat resistance, realization of normal-temperature curing, low cost of raw materials used in the preparation method, simple process, easy operation, strong adaptability of the prepared adhesive to curing environment, low operation requirement and convenient use, only needs to mix all components of the adhesive uniformly and then normally glue the adhesive, and is suitable for structural bonding and reinforcing bonding of small industrial products, such as bonding and fixing of the neck of a motor rotor and the joint of a motor winding coil.)

1. The adhesive special for the high-temperature-resistant motor rotor is characterized by comprising the following raw materials in parts by mass: 78-83 parts of bi-component polyester, 0.05-0.2 part of accelerator, 1-3 parts of curing agent, 17-21 parts of conductive powder, 0.3-0.5 part of defoaming agent, 10-13 parts of molybdenum trioxide, 14-17 parts of barium metaborate and 1-2 parts of lubricant;

wherein the bi-component polyester comprises 15-35% of polyester A and 65-85% of polyester B; the polyester B is saturated polyester resin modified by terephthalic acid and allyl resin;

the saturated polyester resin modified by terephthalic acid and allyl resin is prepared from the following raw materials in parts by weight: 20-25 parts of neopentyl glycol diacetate, 5-10 parts of neopentyl glycol, 40-50 parts of terephthalic acid, 10-15 parts of isophthalic acid, 4-5 parts of tetrahydrophthalic anhydride, 3-5 parts of allyl terephthalate resin, 0.01-2 parts of cobalt naphthenate catalyst and 0.01-2 parts of cyclopentadienyl zirconium trichloride catalyst.

2. The preparation method of the adhesive special for the high-temperature-resistant motor rotor according to claim 1, wherein the conductive powder is one of reduced graphene, polyaniline or crystalline flake graphite.

3. The preparation method of the special adhesive for the high-temperature-resistant motor rotor according to any one of claim 1, wherein the particle size of the conductive powder is 50-100 μm.

4. The adhesive special for the high-temperature-resistant motor rotor as claimed in claim 1, wherein the adhesive further comprises one or two of an antioxidant and a dispersant.

5. The adhesive special for the high-temperature-resistant motor rotor as claimed in claim 1, wherein the antioxidant is one of molybdenum dialkyl dithiocarbamate, propyl gallate or aluminum hydroxy di-p-tert-butyl benzoate; the dispersant is melamine urate.

6. The special adhesive for the high-temperature-resistant motor rotor as claimed in claim 1, wherein the preparation method of the saturated polyester resin modified by the allyl terephthalic acid resin comprises the following steps:

the method comprises the following steps: under the nitrogen environment, adding neopentyl glycol, terephthalic acid, isophthalic acid and tin catalysts, heating to 120 ℃, and stirring;

step two: heating to 225 ℃, preserving heat for 18-21 hours, cooling to 200 ℃, adding tetrahydrophthalic anhydride, and continuing to heat to 225 ℃;

step three: preserving heat for 3-3.5 hours, vacuumizing and dehydrating until the acid value is 35mgKOH/g, cooling to 170 ℃, adding cyclopentadienyl zirconium trichloride, dropwise adding glycidyl methacrylate, preserving heat for 1 hour and discharging.

7. The preparation method of the special adhesive for the high-temperature-resistant motor rotor as claimed in claim 1 is characterized by comprising the following steps:

the method comprises the following steps: mixing the raw materials, placing the mixture in a high-speed mixer, and sequentially stirring the mixture in two sections; in the first stage, stirring for 10-15 min at the stirring speed of 900 rpm; in the second stage, stirring is carried out for 5-10 min at the speed of 2000rpm, and stirring and mixing are carried out uniformly;

step two: extruding and filling; the extruder comprises three temperature intervals; the temperature of the first temperature interval is 185-195 ℃, the temperature of the second temperature interval is 195-205 ℃, and the temperature of the third temperature interval is 195-205 ℃ to obtain the adhesive.

Technical Field

The invention belongs to the technical field of adhesives, and particularly relates to a high-temperature-resistant special adhesive for a motor rotor and a preparation method thereof.

Background

The rotor is a rotating part of the motor, and mechanical torque is output by the rotor to drag the production machine to work. The rotor mainly comprises a rotor iron core, a rotor winding and a rotating shaft. The rotor core is formed by laminating mutually insulated silicon steel sheets with the thickness of 0.35-0.5 mm into a cylinder, parallel grooves are punched on the outer circular surface of the rotor core and are uniformly distributed, and rotor windings are embedded or cast in the grooves. The rotor iron core is pressed on the rotating shaft and can rotate with the rotating shaft to rotate the main rotor at a high speed, and the rotating shaft generates deflection deformation when the speed is close to the critical rotating speed. Even mechanical damage due to resonance. The natural frequency of the transverse vibration of the rotor is multi-step, so its corresponding critical rotational speed is also multi-step. When the working speed of the rotor is lower than a first-order critical speed, the rotor is called a rigid rotor, and when the working speed of the rotor is higher than the first-order critical speed, the rotor is called a flexible rotor. Aiming at the trend of miniaturization, light weight and high output of electric power, electric and electronic equipment, the adhesive is suitable for structural bonding and reinforcing bonding of small industrial products, such as assembly bonding of ferrite and magnetic steel in the production of a magneto, and bonding and fixing of the neck of a motor rotor and the joint of a winding coil of the motor, and the technical personnel in the field need to develop a special adhesive for a high-temperature resistant motor rotor and a preparation method thereof urgently.

Disclosure of Invention

Aiming at the problems, the invention aims to provide a special adhesive for a high-temperature-resistant motor rotor and a preparation method thereof.

The invention is realized by the following technical scheme:

the adhesive special for the high-temperature-resistant motor rotor comprises the following raw materials in parts by weight: 78-83 parts of bi-component polyester, 0.05-0.2 part of accelerator, 1-3 parts of curing agent, 17-21 parts of conductive powder, 0.3-0.5 part of defoaming agent, 10-13 parts of molybdenum trioxide, 14-17 parts of barium metaborate and 1-2 parts of lubricant;

wherein the bi-component polyester comprises 15-35% of polyester A and 65-85% of polyester B; the polyester B is saturated polyester resin modified by terephthalic acid and allyl resin;

the saturated polyester resin modified by terephthalic acid and allyl resin is prepared from the following raw materials in parts by weight: 20-25 parts of neopentyl glycol diacetate, 5-10 parts of neopentyl glycol, 40-50 parts of terephthalic acid, 10-15 parts of isophthalic acid, 4-5 parts of tetrahydrophthalic anhydride, 3-5 parts of allyl terephthalate resin, 0.01-2 parts of cobalt naphthenate catalyst and 0.01-2 parts of cyclopentadienyl zirconium trichloride catalyst.

Further, the conductive powder is one of reduced graphene, polyaniline or crystalline flake graphite.

Furthermore, the particle size of the conductive powder is 50-100 μm.

Further, the adhesive also comprises one or two of an antioxidant and a dispersing agent.

Further, the antioxidant is one of molybdenum dialkyl dithiocarbamate or propyl gallate or aluminum hydroxy di-p-tert-butyl benzoate; the dispersant is melamine urate.

Further, the preparation method of the terephthalic acid and allyl resin modified saturated polyester resin comprises the following steps:

the method comprises the following steps: under the nitrogen environment, adding neopentyl glycol, terephthalic acid, isophthalic acid and tin catalysts, heating to 120 ℃, and stirring;

step two: heating to 225 ℃, preserving heat for 18-21 hours, cooling to 200 ℃, adding tetrahydrophthalic anhydride, and continuing to heat to 225 ℃;

step three: preserving heat for 3-3.5 hours, vacuumizing and dehydrating until the acid value is 35mgKOH/g, cooling to 170 ℃, adding cyclopentadienyl zirconium trichloride, dropwise adding glycidyl methacrylate, preserving heat for 1 hour and discharging.

The preparation method of the special adhesive for the high-temperature-resistant motor rotor comprises the following steps:

the method comprises the following steps: mixing the raw materials, placing the mixture in a high-speed mixer, and sequentially stirring the mixture in two sections; in the first stage, stirring for 10-15 min at the stirring speed of 900 rpm; in the second stage, stirring is carried out for 5-10 min at the speed of 2000rpm, and stirring and mixing are carried out uniformly;

step two: extruding and filling; the extruder comprises three temperature intervals; the temperature of the first temperature interval is 185-195 ℃, the temperature of the second temperature interval is 195-205 ℃, and the temperature of the third temperature interval is 195-205 ℃ to obtain the adhesive.

The invention has the beneficial effects that:

the invention utilizes the crosslinking polymerization reaction of unsaturated polyester and terephthalic acid and allyl resin, and the polymerization reaction of polyester containing hydroxyl and terephthalic acid and allyl resin, the two reactions proceed simultaneously to form an IPN structure, the latter reaction forms terephthalic acid and the allyl resin segment simultaneously increases the relative molecular mass of the resin, so that the micro-phase separation is carried out after the solidification of the macromolecules to form a flexible and rigid alternate chain segment, thereby achieving the synergistic effect of the hardness, the flexibility and the impact resistance, particularly terephthalic acid and allyl resin segments are easy to extend the chain link of the segment after being cured and heated, therefore, the curing shrinkage of the unsaturated polyester is counteracted, the shrinkage of the resin is reduced, the adhesive property of the adhesive is improved, the advantages of the two components are complementary, the performance is greatly improved, high hardness and high heat resistance can be obtained, and the requirement of the heat resistance of a motor rotor is met.

Compared with the prior art, the invention has the following advantages:

the adhesive disclosed by the invention has good high-temperature strength, stable electric heating performance, excellent radiation resistance and low-temperature resistance, has water resistance, oil resistance, electric insulation property and chemical stability, can be used for directly pressing and bonding base materials together after filling, can quickly form bonding after cooling and curing, does not need drying, is suitable for the requirement of efficiently producing the adhesive for the motor rotor, has no residual solvent in a glue layer, is suitable for structural bonding and reinforcing bonding of small industrial products, such as assembly bonding of ferrite and magnetic steel in the production of a magneto, bonding and fixing of the neck of a motor rotor and the joint part of a winding coil of the motor, has good operation performance in chemical characteristics and thermal physical characteristics, and can further cope with automation and high speed of assembly technology.

Detailed Description

The invention is illustrated by the following specific examples, which are not intended to be limiting.