WO2021077404A1

WO2021077404A1 - Damping and heat-insulation structure, preparation method therefor and application thereof

Info

Publication number: WO2021077404A1
Application number: PCT/CN2019/113295
Authority: WO
Inventors: 许勇; 唐波; 周雨琪; 孙春燕; 陈风波; 孙妮娟; 胡晓燕; 刘群策; 赵鑫
Original assignee: 航天材料及工艺研究所
Priority date: 2019-10-23
Filing date: 2019-10-25
Publication date: 2021-04-29
Also published as: CN110809378A; CN110809378B

Abstract

A damping and heat-insulation structure, a preparation method therefor and an application thereof, relating to the technical field of protection of electronic components. The damping and heat-insulation structure is used for protecting a core component. The structure comprises a polyurethane damping layer, a restraint shell, a heat-insulation layer, a housing, and a heat-resistant layer from inside to outside. The preparation method comprises: synthesis and encapsulation molding of a damping layer material, processing molding of a heat-insulation tile structure, preparation of a restraint shell and a housing, assembly, connection and sealing of multiple structure layers, and preparation of a heat-resistant coating. By means of the superposition of the multiple structure layers and the sealing connection between the layers, the core element can work normally in a short-time high-temperature or instantaneous violent impact vibration environment. The structure features small size, ablation resistance, high temperature resistance, good water resistance, and strong vibration impact resistance.

Description

[Name of invention established by ISA according to Rule 37.2] 　Damping and thermal insulation structure and its preparation method and application

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on October 23, 2019, the application number is 201911014208.8, and the invention title is "A damping/insulation structure and its preparation method and application", the entire content of which is approved The reference is incorporated in this application.

Technical field

The invention relates to a damping/heat insulation structure and a preparation method and application thereof, belonging to the technical field of protection of electronic components, and in particular to a preparation method of a damping/heat insulation composite functional structure for protecting core components.

Background technique

In the fields of aerospace, ships, ships, high-speed trains, etc., in order to ensure that precision instruments such as electronic components, data loggers, etc. can continue to work normally for a period of time to record information and data in complex working environments or under severe sudden conditions such as high temperatures and impacts, It is necessary to add a protective structure on the outside of these core components.

Such products are currently basically imported from abroad. On the one hand, in order to achieve the impact resistance and heat insulation performance indicators, it is usually necessary to coat a thicker outer layer material, resulting in a large overall volume and quality of the protective structure, which is not conducive to the assembly and use of the product. On the other hand, the structure, materials and preparation process of imported products are in a state of technological blockade, and the purchase and use of products are easily restricted, and even affect the development of products in the above-mentioned fields.

Therefore, it is necessary to design damping/heat insulation multi-layer composite structures and materials to make them have good sealing, waterproof, temperature and impact resistance performance while reducing the volume.

Summary of the invention

The technical solution of the present invention is to overcome the shortcomings of the prior art, and propose a damping/heat insulation structure and its preparation method and application. The structure is a structure with good heat insulation performance, vibration resistance and impact resistance and a certain degree of sealing. Damping and heat insulation composite structure.

The technical solution of the present invention is:

A damping/heat insulation structure, which is used to protect core components. The structure includes a polyurethane damping layer, a constraining shell, a heat insulation layer, an outer shell, and a heat protection layer from the inside to the outside;

The raw materials of the polyurethane damping layer include MDI (diphenylmethane diisocyanate), castor oil, chain extender and catalyst, and the total mass of MDI (diphenylmethane diisocyanate) and castor oil is calculated as 100 parts, the catalyst The mass parts of MDI is 0～1.0 parts, and the chain extension coefficient is 0.85～0.95. Among the total mass of MDI (diphenylmethane diisocyanate) and castor oil, the mass percentage of MDI (diphenylmethane diisocyanate) is 30%～60%, the mass percentage of castor oil is 40%～70%;

The chain extender is one of polyether polyol N210, polyether polyol N303 or MOCA;

The catalyst is at least one of dibutyltin dilaurate, dibutyltin oxide or dioctyltin dithiolate;

The material of the constraining shell is a high-strength alloy, preferably 30CrMnSiA or 0Cr17Ni4Cu4Nb, the inner profile of the constraining shell is consistent with the outer profile of the core component to be protected, and the inner profile of the constraining shell is consistent with the core component to be protected The distance of the external surface is 3～5mm;

The heat insulation layer is processed by lightweight rigid ceramic heat insulation tiles with a thickness of 30-50 mm, and the inner profile of the heat insulation layer is consistent with the outer profile of the constraining shell; the materials of the heat insulation layer include ceramic fiber, starch, A sintering aid and a sunscreen, wherein the ceramic fiber is composed of 50%-100% quartz fiber and 0-50% mullite fiber, the sintering aid is a nitriding shed, and the quality of the nitriding shed is a ceramic fiber. 0.01% to 15% of the mass, the starch mass is 0.05% to 15% of the ceramic fiber mass, the sunscreen is silicon carbide, and the silicon carbide mass is 0-20% of the ceramic fiber mass.

The shell is a high-strength alloy, preferably 30CrMnSiA or 0Cr17Ni4Cu4Nb; the inner surface of the shell is the same as the outer surface of the heat insulation layer;

The raw materials of the heat protection layer include component A, component B and component C, wherein component A includes phenyl polysiloxane and filler, component B is tetraethylorthosilicate, and component C As an accelerator, the mass parts of phenyl polysiloxane is calculated as 100 parts, the mass parts of filler is 10-50 parts, and the mass parts of tetraethyl orthosilicate is 4-10 parts. The number of parts by mass is 0.4～1.6 parts;

The filler is at least one of white carbon black, carbon black, iron oxide red, aluminum oxide, aluminum hydroxide, or silica powder;

The accelerator is at least one of dibutyltin dilaurate, dioctyltin dilaurate or silane coupling agent;

Adhesive is used to constrain the shell and the heat insulation layer to bond;

Adhesive is used to bond the insulation layer and the shell;

The raw materials of the adhesive include component a, component b and component c. Component a includes room temperature vulcanized silicone rubber and fillers, component b is silicone oil, and component c is accelerator. The quality of room temperature vulcanized silicone rubber The parts are calculated as 100 parts, the mass parts of the filler is 140-240 parts, the mass parts of the silicone oil is 48-72 parts, and the mass parts of the accelerator is 2.0-2.8; the adhesive is obtained by mixing the raw materials of the adhesive;

The filler is at least one of white carbon black, carbon black, iron oxide red, aluminum oxide, zinc oxide or silicon powder;

The accelerator is at least one of dibutyltin dilaurate, dioctyltin dilaurate or silane coupling agent.

A method for preparing a damping/heat insulation structure. The damping/heat insulation structure prepared by the method is used to protect core components. The steps of the method include:

(1) Mix the raw materials of the polyurethane damping layer to obtain a polyurethane damping material slurry;

(2) Install the core component to be protected in the constraining shell, and pour the polyurethane damping material slurry obtained in step (1) into the cavity between the core component to be protected and the constrained shell, and solidify;

(3) After the curing in step (2) is completed, apply adhesive on the outer surface of the constrained shell, coat the inner surface of the thermal insulation layer with adhesive, and then place the constrained shell coated with adhesive on the inner surface In the cavity of the thermal insulation layer coated with adhesive, cure at room temperature for 3 to 5 days;

(4) After the curing in step (3) is completed, coat the adhesive on the outer surface of the heat insulation layer, coat the adhesive on the inner surface of the shell, and then place the heat insulation layer coated with the adhesive on the inner surface of the coating In the cavity of the shell of the adhesive, cure at room temperature for 3 to 5 days, and perform surface treatment on the shell after curing;

(5) Mixing the raw materials of the heat protection layer to obtain a slurry of the heat protection layer;

(6) After the curing in step (4) is completed, the slurry of the heat shielding layer obtained in step (5) is coated on the outer surface of the shell, and cured at room temperature for 3 to 5 days, and the thickness of the heat shielding layer is 3 to 6 mm .

In the step (2), when the core component to be protected is installed in the restraining shell, the fixing device is positioned in the center of the restraining shell to ensure that the core component to be protected does not touch the restraining shell at any position; It is carried out in two steps. In the first step, the polyurethane damping material slurry is injected into the bottom 1/4 to 1/2 of the restraining shell, and cured at 60 to 80°C for 8 to 16 hours, and the fixing device is removed; the second step , Continue to pour polyurethane damping material slurry in the restraining shell until the polyurethane damping material slurry covers all the core components to be protected, and cure at 60～80℃ for 8～16h;

In the step (4), the method for surface treatment of the shell is to roughen the surface of the shell by sand blowing, the sand blowing pressure is 0.05-0.1 MPa, and the sand particle size is 16-40 mesh.

An application of a damping/heat insulation structure, which is used to protect core components.

The core components are electronic components or data recorders.

The present invention has the following beneficial effects:

(1) The present invention uses a cast-type high-damping polyurethane material. For components with different shapes and structures, they can be completely covered by the fluidity of polyurethane, and the components are integrally sealed in the constraining shell. The damping material achieves the Vibration damping and impact resistance; on the other hand, polyurethane materials have good insulation, excellent oil resistance and aging resistance, and have no effect on the electrical properties of electronic components.

(2) The three-layer thermal insulation structure of low thermal conductivity insulation tile material, high temperature resistant sealing adhesive, and heat-resistant coating used in the present invention has a good thermal insulation effect on the core components, and the outer heat-resistant coating is in When it encounters high temperature, it will burn away heat. The extremely low thermal conductivity of the insulation tile layer prevents heat from being transferred to the core part within a certain period of time, ensuring that the components can work normally for a period of time in a high temperature environment, and protect the already The recorded information and data, and the high temperature resistant sealing adhesive fills all the interface gaps to ensure that the heat flow will not enter the core part through the connection part.

(3) The present invention is small in size, light in weight and easy to assemble. It has been applied in the on-line test run test of new model high-speed EMUs, and it is expected to be popularized in similar products in the fields of aerospace, ships and ships.

(4) The thermal insulation tile of the present invention can effectively isolate the heat transfer. The thermal insulation tile layer is placed on the outside of the damping layer and bonded through a specific high temperature resistant sealing adhesive, which can achieve the overall sealing and thermal insulation of the core components and ensure It can work normally for a long time in an environment of no higher than 100°C, and works normally for a short time in an extremely high temperature environment of 500 to 700°C.

(5) The present invention is composed of a multi-layer composite structure of outer shell and damping polyurethane material, insulation tile material and functional adhesive filled inside, and its preparation method includes synthesis and potting molding of damping layer material, and insulation tile structure The processing and molding, the preparation of constrained shells and shells, the assembly, connection and sealing of multilayer structures and the coating of heat-resistant coatings. The invention realizes the normal operation of the core element under short-term high temperature or instantaneous severe shock and vibration environment through the superposition of multi-layer structure and the sealing connection between layers, and has the advantages of small size, ablation resistance, high temperature resistance, good waterproof performance, and The characteristic of strong vibration and shock ability.

Description of the drawings

Figure 1 is an exploded schematic diagram of the structure of the present invention;

Fig. 2 is a schematic flow diagram of the method of the present invention.

Detailed ways

As shown in Fig. 1 and Fig. 2, a damping/heat insulation structure includes a polyurethane damping layer 1, a constraining shell 2, a heat insulation layer 3, a shell 4, and a heat protection layer 5 from the inside to the outside;

The inner profile of the constraining shell 2 is consistent with the outer profile of the core component to be protected, and the distance between the inner profile of the constraining shell 2 and the outer profile of the core component to be protected is 3 to 5 mm;

The inner profile of the heat insulation layer 3 is consistent with the outer profile of the restraining shell 2;

The inner profile of the outer shell 4 is consistent with the outer profile of the heat insulation layer 3;

The constraining shell 2 and the heat insulation layer 3 are bonded by an adhesive;

The thermal insulation layer 3 and the shell 4 are bonded by an adhesive.

The raw materials of the polyurethane damping layer 1 include diphenylmethane diisocyanate, castor oil, chain extender and catalyst, and the total mass of diphenylmethane diisocyanate and castor oil is calculated as 100 parts, and the mass parts of the catalyst is 0～1.0 parts, chain extension coefficient is 0.85～0.95; in the total mass of diphenylmethane diisocyanate and castor oil, the mass percentage of diphenylmethane diisocyanate is 30%～60%, and the mass percentage of castor oil is 100%. The sub-content is 40% to 70%.

The chain extender is one of polyether polyol N210, polyether polyol N303, MOCA; the catalyst is one of dibutyltin dilaurate, dibutyltin oxide, and dioctyltin dithiol Kind.

The materials of the heat insulation layer 3 include ceramic fibers, starch, sintering aids and sunscreens. The ceramic fibers are composed of 50%-100% quartz fibers and 0-50% mullite fibers. The sintering aids Nitrided shed, the mass of the nitrided shed is 0.01%-15% of the mass of ceramic fiber, the mass of starch is 0.05%-15% of the mass of ceramic fiber, the sunscreen is silicon carbide, the mass of silicon carbide is not more than 20% of the mass of ceramic fiber .

The raw materials of the heat protection layer 5 include component A, component B, and component C, wherein component A includes phenyl polysiloxane and filler, component B is tetraethylorthosilicate, and component C is Divided into accelerators, calculated based on 100 parts by mass of phenyl polysiloxane, 10-50 parts by mass of filler, 4-10 parts by mass of tetraethylorthosilicate, accelerator The number of parts by mass is 0.4 to 1.6 parts.

The filler is at least one of white carbon black, carbon black, iron oxide red, aluminum oxide, aluminum hydroxide, and silica powder; the accelerator is dibutyltin dilaurate, dioctyltin dilaurate or silane At least one of coupling agents.

The raw materials of the adhesive include component a, component b and component c. Component a includes room temperature vulcanized silicone rubber and fillers, component b is silicone oil, and component c is accelerator. The quality of room temperature vulcanized silicone rubber The parts are calculated as 100 parts, the mass parts of the filler is 140-240 parts, the mass parts of the silicone oil is 48-72 parts, and the mass parts of the accelerator is 2.0-2.8; the adhesive is obtained by mixing the raw materials of the adhesive.

The material of the constraining shell 2 is 30CrMnSiA or 0Cr17Ni4Cu4Nb;

The heat insulation layer 3 is processed by lightweight rigid ceramic heat insulation tiles with a thickness of 30-50 mm.

The material of the shell 4 is 30CrMnSiA or 0Cr17Ni4Cu4Nb.

A method for preparing a damping/heat insulation structure, the steps of the method include:

(1) Mix the raw materials of the polyurethane damping layer 1 to obtain a polyurethane damping material slurry;

(2) Install the core component to be protected in the constraining shell 2, and pour the polyurethane damping material slurry obtained in step (1) into the cavity between the core component to be protected and the constrained shell 2, and solidify ；

(3) After the curing in step (2) is completed, coat adhesive on the outer surface of the constrained shell 2, coat the inner surface of the thermal insulation layer 3 with adhesive, and then place the constrained shell 2 coated with adhesive on the outer surface Into the cavity of the thermal insulation layer 3 coated with adhesive on the inner surface, curing at room temperature for 3 to 5 days;

(4) After the curing in step (3) is completed, coat the adhesive on the outer surface of the heat-insulating layer 3, coat the adhesive on the inner surface of the shell 4, and then place the heat-insulating layer 3 coated with adhesive on the outer surface. In the cavity of the shell 4 coated with the adhesive, cure at room temperature for 3 to 5 days, and perform surface treatment on the shell 4 after the curing is completed;

(5) Mixing the raw materials of the heat protection layer 5 to obtain a slurry of the heat protection layer 5;

(6) After the curing in step (4) is completed, the slurry of the heat protection layer 5 obtained in step (5) is coated on the outer surface of the shell 4 and cured at room temperature for 3 to 5 days to obtain a damping/heat insulation structure.

In the step 2, the core component to be protected is installed in the center of the restraining housing 2, and the core component to be protected does not touch the restraining housing 2 at any position. The pouring is carried out in two steps. The first step is: Pour the polyurethane damping material slurry into the 1/4 to 1/2 of the bottom end of the constrained shell 2 and cure at 60～80°C for 8 to 16 hours. In the second step, continue to pour the polyurethane damping material in the constrained shell 2 The slurry to the polyurethane damping material slurry covers all the core components to be protected, and is cured at 60-80°C for 8-16h.

In the step 4, the method for surface treatment of the shell 4 is to roughen the surface of the shell 4 by sand blowing, the sand blowing pressure is 0.05-0.1 MPa, and the sand particle size is 16-40 mesh.

In the step 6, the thickness of the heat-proof layer 5 is 3-6 mm.

The core components are electronic components or data recorders.

The present invention will be further described below in conjunction with the drawings and embodiments.

A preparation of a damping/heat insulation structure for a data recording circuit unit includes a layer by layer arrangement of a polyurethane damping layer 1, a constraining shell 2, a heat insulation layer 3, a shell 4, and a heat protection layer 5.

Example 1

As shown in Figure 2, a method for preparing a damping/heat insulation structure includes the following steps:

(1) The restraining shell 2 and the shell 4 are made of high-strength alloy 0Cr17Ni4Cu4Nb, and the outer surfaces of the two shells are made of 0.05MPa, 40-mesh sand for sandblasting.

(2) Preparation method of polyurethane damping layer 1: including synthesis of polyurethane material and potting molding of damping layer. The synthesis of the polyurethane material contains the following components by weight: 40 parts of liquefied MDI, 60 parts of castor oil, 0.05 parts of dibutyltin dilaurate, and the chain extender polyether polyol N210 is added according to the chain extension coefficient of 0.9. The polyurethane material is synthesized by a two-step method. Use tooling to fix the data recording circuit unit in the center of the restraining shell to ensure that there is no contact point between the circuit unit and the restraining shell. Inject synthetic polyurethane slurry into the restraining shell, and stop the polyurethane slurry at 1/2 of the restraining shell. Potting, transfer the whole to a heating device, and take it out after curing in an oven at 60～80℃ for 8～16h. Remove the fixed tooling, fill the gap between the constraining shell 2 and the data recording circuit unit with polyurethane slurry according to the above process, and put the whole into a vacuum box with a vacuum of ~0.08MPa for deaeration for 10 minutes, and continue at 60 ~ 80 Cure in an oven at ℃ for 8-16 hours to complete the preparation of the damping layer 1 and its assembly with the restraining shell 2.

(3) Preparation method of thermal insulation layer 3:

1) Weigh 84g of nitriding shed and disperse it in 1000mL of ethanol, and after the dispersion is uniform, set aside;

2) Weigh 1912 g of quartz fiber, 350 g of mullite fiber, 207 g of starch, and the solution in (1) and mix with 100 L of deionized water, and use a mechanical mixer to uniformly disperse the fibers in deionized water to obtain a slurry.

3) Transfer the above-mentioned slurry to a forming mold and vacuum filter; transfer the filter cake to a pressure forming machine, apply a pressure of 7-9 MPa to form, and obtain a wet green of the ceramic insulation tile.

4) Put the wet ceramic insulation tile in an oven at 80-120°C for 24 to 48 hours to obtain a dry ceramic insulation tile.

5) Put the dry blank of the ceramic insulation tile into a high-temperature sintering furnace, and treat it at 1200-1500°C for 4-10 hours to obtain the ceramic insulation tile.

According to the size of the inner cavity of the restraining shell and the metal shell, the insulation layer 3 is formed by using insulation tiles;

(4) Preparation of adhesive: component a: 100 parts of room temperature vulcanized silicone rubber, 145 parts of iron oxide red and 5 parts of white carbon black; component b: 48 parts of silicone oil; component c: 2.1 parts of dibutyl tin dilaurate. The adhesive is prepared according to a:b:c=85:15:0.7 before each use, mixed evenly, and used within 20min.

(5) Adhesion of the constraining shell 2 and the thermal insulation layer 3: uniformly coat the adhesive prepared in step (4) on the outer surface of the constraining shell 2 and the inner surface of the thermal insulation layer 3, and then place the constraining shell 2 Into the cavity of the thermal insulation layer 3 coated with the adhesive on the inner surface, curing at room temperature for 3 to 5 days.

(6) Adhesion of the heat insulation layer 3 and the shell 4: The adhesive prepared in step (4) is evenly coated on the outer surface of the heat insulation layer 3 and the inner surface of the shell 4, and then the heat insulation layer 3 (which has been connected to the restraining shell The body 2 is bonded into a whole) and placed in the cavity of the housing 4, and cured at room temperature for 3 to 5 days.

(7) Preparation of heat-resistant coating 5: It is composed of the following components in parts by weight: component A: 100 parts of phenyl polysiloxane, 5 parts of carbon black, 10 parts of iron oxide red, 5 parts of aluminum hydroxide; B Components: 4 parts of tetraethyl orthosilicate; C component: 0.8 parts of dibutyltin dilaurate. Before using the heat-resistant coating, mix the components A, B, and C evenly to make a heat-resistant coating slurry, remove oil and other impurities on the surface of the metal shell, and evenly coat the prepared heat-resistant coating slurry on the metal shell The surface is pressurized as a whole with tooling, and cured for 3 to 5 days at room temperature, and then the tooling is removed. After passing the inspection, it will be put into storage.

Example 2

(1) The restraining shell 2 and the shell 4 are processed by high-strength alloy 30CrMnSiA, and the outer surfaces of the two shells are both 0.05MPa, 40 mesh size sand for sand blowing.

(2) Preparation method of polyurethane damping layer 1: including synthesis of polyurethane material and potting molding of damping layer. The synthesis of the polyurethane material contains the following components in parts by weight: 30 parts of liquefied MDI, 70 parts of castor oil, 0.1 part of dibutyl tin oxide, and the chain extender polyether polyol N303 is added according to the chain extension coefficient of 0.95. The polyurethane material is synthesized by a two-step method. Use tooling to fix the data recording circuit unit in the center of the restraining shell to ensure that there is no contact point between the circuit unit and the restraining shell. Inject synthetic polyurethane slurry into the restraining shell, and stop the polyurethane slurry at 1/2 of the restraining shell. Potting, transfer the whole to a heating device, and take it out after curing in an oven at 60～80℃ for 8～16h. Remove the fixed tooling, fill the gap between the constraining shell 2 and the data recording circuit unit with polyurethane slurry according to the above process, and put the whole into a vacuum box with a vacuum of ~0.08MPa for deaeration for 10 minutes, and continue at 60 ~ 80 Cure in an oven at ℃ for 8-16 hours to complete the preparation of the damping layer 1 and its assembly with the restraining shell 2.

(3) Preparation method of thermal insulation layer 3:

1) Weigh 84g of nitride shed and 100g of silicon carbide and disperse in 2000mL of absolute ethanol. After the dispersion is uniform, set aside;

(4) Preparation of adhesive: component a: 100 parts room temperature vulcanized silicone rubber, 160 parts of iron oxide red and 20 parts of alumina; component b: 48 parts of silicone oil; component c: 2.4 parts of dioctyltin dilaurate. The adhesive is prepared according to a:b:c=110:15:0.8 before each use, mixed evenly, and used within 20min.

(7) Preparation of heat-resistant coating 5: It is composed of the following components in parts by weight: component A: 100 parts of phenyl polysiloxane, 2 parts of white carbon black, 16 parts of iron oxide red and 2 parts of alumina; B Components: 4 parts of tetraethyl orthosilicate; C component: 0.8 parts of dioctyltin dilaurate. Before using the heat-resistant coating, mix the components A, B, and C evenly to make a heat-resistant coating slurry, remove oil and other impurities on the surface of the metal shell, and evenly coat the prepared heat-resistant coating slurry on the metal shell The surface is pressurized as a whole with tooling, and cured for 3 to 5 days at room temperature, and then the tooling is removed. After passing the inspection, it will be put into storage.

Example 3

(2) Preparation method of polyurethane damping layer 1: including synthesis of polyurethane material and potting molding of damping layer. The synthesis of polyurethane material contains the following components by weight: 40 parts of liquefied MDI, 60 parts of castor oil, and chain extender MOCA is added according to the chain extension coefficient of 0.85. The polyurethane material is synthesized by a two-step method. Use tooling to fix the data recording circuit unit in the center of the restraining shell to ensure that there is no contact point between the circuit unit and the restraining shell. Inject synthetic polyurethane slurry into the restraining shell, and stop the polyurethane slurry at 1/2 of the restraining shell. Potting, transfer the whole to a heating device, and take it out after curing in an oven at 60～80℃ for 8～16h. Remove the fixed tooling, fill the gap between the constraining housing 2 and the data recording circuit unit with polyurethane slurry according to the above process, and put the whole into a vacuum box with a vacuum of ~0.08MPa for deaeration for 10 minutes, and continue at 60 ~ 80 Cure in an oven at ℃ for 8-16 hours to complete the preparation of the damping layer 1 and its assembly with the restraining shell 2.

(3) Preparation method of thermal insulation layer 3:

1) Weigh 38.2 g of nitridation shed and disperse it in 1000 mL of ethanol. After the dispersion is uniform, it is ready for use.

2) Weigh 870 g of quartz fiber, 240 g of mullite fiber, 94 g of starch and the solution in (1) and mix with 100 L of deionized water, and use a mechanical mixer to uniformly disperse the fibers in deionized water to obtain a slurry.

3) Transfer the above-mentioned slurry to a forming mold and vacuum filter; transfer the filter cake to a pressure forming machine, apply a pressure of 4-6 MPa to form, and obtain a wet ceramic insulation tile.

4) Put the wet ceramic insulation tile in an oven at 120-150°C and dry for 12 to 36 hours to obtain a ceramic insulation tile dry.

5) Put the dry blank of the ceramic insulation tile into a high-temperature sintering furnace, and treat it at 1300-1500°C for 4-8 hours to obtain the ceramic insulation tile.

(4) Preparation of adhesive: component a: 100 parts of room temperature vulcanized silicone rubber, 145 parts of iron oxide red, 5 parts of carbon black; component b: 45 parts of silicone oil; component c: 1.26 parts of dibutyltin dilaurate, silane 0.84 parts of coupling agent. The adhesive is prepared according to a:b:c=90:15:0.7 before each use, mixed evenly, and used within 20min.

(7) Preparation of heat-resistant coating 5: It is composed of the following components in parts by weight: component A: 100 parts of phenyl polysiloxane, 16 parts of carbon black, 4 parts of iron oxide red; component B: orthosilicic acid 4 parts of tetraethyl ester; component C: 0.6 part of dioctyltin dilaurate. Before using the heat-resistant coating, mix the components A, B, and C evenly to make a heat-resistant coating slurry, remove oil and other impurities on the surface of the metal shell, and evenly coat the prepared heat-resistant coating slurry on the metal shell The surface is pressurized as a whole with tooling, and cured for 3 to 5 days at room temperature, and then the tooling is removed. After passing the inspection, it will be put into storage.

Example 1-Example 3 Test of damping/heat insulation performance:

1) Damping performance

The damping performance is tested by the impact resistance test. The equipment used is as follows:

序号Serial number	设备名称Equipment name	设备型号 Device model		数量Quantity
11	Lansment跌落式冲击台Lansment drop impact table	M65/81M65/81	1台套1 set

During the inspection period of the test system, the equipment can operate normally, the target acceleration value is 100g, the pulse width time is 10ms; the actual control value is 102.03g, and the pulse width time is 10.06ms, which meets the actual test requirements.

Carry out the test loading of the products of Example 1 to Example 3 in the axial direction (X direction), vertical direction (Y direction), and lateral direction (Z direction) respectively, and perform the following table 1:

Table 1 Impact test test conditions

2) Thermal insulation performance

Heat the high-temperature furnace to 700 degrees Celsius, and when the temperature is stably displayed as 700 ± 5 degrees Celsius, put the products of Example 1 to Example 3 into the high-temperature furnace one by one, close the furnace door, and take it out after counting for 300 seconds. After cooling, the product is mechanically cut, and the internal bonding and sealing layer, heat insulation layer and damping layer are all intact.

After completing the above two tests, take out the data recording circuit unit for power-on test, the data is read normally, and the performance meets the technical index requirements.

Claims

A damping/heat insulation structure, characterized in that the structure includes a polyurethane damping layer (1), a constraining shell (2), a heat insulation layer (3), an outer shell (4) and a heat protection layer (5) from the inside to the outside. );

The inner profile of the constraining shell (2) is consistent with the outer profile of the core component to be protected, and the distance between the inner profile of the constraining shell (2) and the outer profile of the core component to be protected is 3～ 5mm;

The inner surface of the heat insulation layer (3) is consistent with the outer surface of the restraining shell (2);

The inner profile of the outer shell (4) is consistent with the outer profile of the heat insulation layer (3);

The constraining shell (2) and the heat insulation layer (3) are bonded by an adhesive;

The heat insulation layer (3) and the shell (4) are bonded by an adhesive.
The damping/heat insulation structure according to claim 1, characterized in that: the raw materials of the polyurethane damping layer (1) include diphenylmethane diisocyanate, castor oil, chain extender and catalyst, and diphenyl The total mass of methane diisocyanate and castor oil is calculated as 100 parts, the mass parts of the catalyst is 0-1.0 parts, the chain extension coefficient is 0.85-0.95; the total mass of diphenylmethane diisocyanate and castor oil, diphenyl The mass percentage of methyl methane diisocyanate is 30% to 60%, and the mass percentage of castor oil is 40% to 70%.
The damping/heat insulation structure according to claim 2, wherein the chain extender is one of polyether polyol N210, polyether polyol N303, and MOCA; and the catalyst is two One of dibutyltin laurate, dibutyltin oxide, and dioctyltin dithiolate.
A damping/heat insulation structure according to any one of claims 1 to 3, characterized in that: the material of the heat insulation layer (3) includes ceramic fibers, starch, sintering aids and sunscreens, wherein the ceramic fibers are made of The mass percentage is composed of 50%-100% quartz fiber and 0-50% mullite fiber. The sintering aid is a nitride shed. The weight of the nitridation shed is 0.01%-15% of the ceramic fiber. The starch quality is ceramic fiber. 0.05%-15% of the mass, the sunscreen is silicon carbide, and the mass of the silicon carbide is not more than 20% of the mass of the ceramic fiber.
A damping/heat insulation structure according to any one of claims 1 to 3, characterized in that: the raw materials of the heat protection layer (5) include component A, component B and component C, wherein A The components include phenyl polysiloxane and fillers, the B component is tetraethyl orthosilicate, the C component is the accelerator, and the mass parts of the phenyl polysiloxane are calculated as 100 parts, and the mass parts of the filler The number is 10-50 parts, the mass parts of the tetraethyl orthosilicate is 4-10 parts, and the mass parts of the accelerator is 0.4-1.6 parts.
The damping/heat insulation structure according to claim 5, wherein the filler is at least one of white carbon black, carbon black, iron oxide red, aluminum oxide, aluminum hydroxide, and silicon powder; The accelerator is at least one of dibutyltin dilaurate, dioctyltin dilaurate or silane coupling agent.
A damping/heat insulation structure according to any one of claims 1, 2, 3, 6, wherein the raw material of the adhesive includes component a, component b and component c, and component a includes Room temperature vulcanized silicone rubber and filler, component b is silicone oil, component c is accelerator, calculated by mass parts of room temperature vulcanized silicone rubber as 100 parts, the mass parts of filler is 140-240 parts, the mass parts of silicone oil It is 48 to 72 parts, and the mass parts of the accelerator is 2.0 to 2.8; the adhesive is obtained after mixing the raw materials of the adhesive.
The damping/heat insulation structure according to claim 7, wherein the filler is at least one of white carbon black, carbon black, iron oxide red, aluminum oxide, aluminum hydroxide, and silicon powder; The accelerator is at least one of dibutyltin dilaurate, dioctyltin dilaurate or silane coupling agent.
A damping/heat insulation structure according to any one of claims 1, 2, 3, 6, and 8, wherein the material of the constraining shell (2) is 30CrMnSiA or 0Cr17Ni4Cu4Nb;
A damping/heat insulation structure according to any one of claims 1, 2, 3, 6, and 8, characterized in that: the heat insulation layer (3) is processed by lightweight rigid ceramic insulation tiles with a thickness of 30-50mm to make.
A damping/heat insulation structure according to any one of claims 1, 2, 3, 6, and 8, characterized in that the material of the shell (4) is 30CrMnSiA or 0Cr17Ni4Cu4Nb.
A method for preparing a damping/heat insulation structure, characterized in that the steps of the method include:

(1) Mix the raw materials of the polyurethane damping layer (1) to obtain a polyurethane damping material slurry;

(2) Install the core component to be protected in the restraining shell (2), and pour the polyurethane damping material obtained in step (1) into the cavity between the core component to be protected and the restraining shell (2) Slurry, solidify;

(3) After the curing in step (2) is completed, coat adhesive on the outer surface of the constraining shell (2), coat the adhesive on the inner surface of the thermal insulation layer (3), and then coat the outer surface with adhesive for restraint The shell (2) is placed in the cavity of the thermal insulation layer (3) coated with adhesive on the inner surface, and cured at room temperature for 3 to 5 days;

(4) After the curing in step (3) is completed, coat the adhesive on the outer surface of the heat insulation layer (3), coat the adhesive on the inner surface of the shell (4), and then coat the outer surface with the heat insulation layer of adhesive (3) Place it in the cavity of the shell (4) coated with adhesive on the inner surface, cure at room temperature for 3 to 5 days, and perform surface treatment on the shell (4) after curing is completed;

(5) Mixing the raw materials of the heat protection layer (5) to obtain a slurry of the heat protection layer (5);

(6) After the curing in step (4) is completed, the slurry of the heat shield (5) obtained in step (5) is coated on the outer surface of the shell (4) and cured at room temperature for 3 to 5 days to obtain damping/ Insulation structure.
The method for preparing a damping/heat insulation structure according to claim 12, characterized in that: in the step (2), the core component to be protected is installed in the center of the restraining shell (2), and The core components to be protected do not touch the restraining shell (2) at any position. The pouring is carried out in two steps. In the first step, the polyurethane damping material slurry is injected into the bottom end of the restraining shell (2) 1/4～1/ 2 places, curing at 60～80℃ for 8～16h, the second step is to continue pouring polyurethane damping material slurry in the constrained shell (2) until the polyurethane damping material slurry covers all the core components to be protected. Curing at 60～80℃ for 8～16h.
A method for preparing a damping/heat insulation structure according to claim 12 or 13, characterized in that: in the step (4), the method for surface treatment of the shell (4) is to use sand blowing The surface of the shell (4) is roughened, the sand blowing pressure is 0.05-0.1 MPa, and the sand particle size is 16-40 mesh.
The method for preparing a damping/heat insulation structure according to claim 12 or 13, characterized in that: in the step (6), the thickness of the heat protection layer (5) is 3-6 mm.
An application of a damping/heat insulation structure is characterized in that: the damping/heat insulation structure is used to protect core components.
The application of a damping/heat insulation structure according to claim 16, wherein the core component is an electronic component or a data recorder.