阅读说明：本技术 车用阻尼型高倍率橡胶膨胀胶片及其制备方法 (Damping type high-rate rubber expansion rubber sheet for vehicle and preparation method thereof ) 是由 谢宇 张吉龙 窦城 黄会强 于 2021-06-23 设计创作，主要内容包括：本发明涉及一种车用阻尼型高倍率橡胶膨胀胶片及其制备方法,包括如下重量比的成分：橡胶38-42份、阻尼填料55-57份、硫化剂2份、促进剂0.2份,其余为发泡剂,所述发泡剂设置有一种或一种以上。本发明通过在原有体系中加入一定比例阻尼填料和特定的发泡剂,解决了汽车生产过程中的膨胀胶片没有阻尼功能和倍率低的问题,使得胶片在具备吸隔音的基础上具备阻尼性和高膨胀倍率,提高阻尼减振性能的同时,在达到相同空腔间隙封堵时也降低了胶片的厚度,能够一定程度的降低成本。(The invention relates to a damping type high-rate rubber expansion film for a vehicle and a preparation method thereof, wherein the damping type high-rate rubber expansion film comprises the following components in parts by weight: 38-42 parts of rubber, 55-57 parts of damping filler, 2 parts of vulcanizing agent, 0.2 part of accelerant and the balance of foaming agent, wherein one or more foaming agents are arranged. According to the invention, by adding a certain proportion of damping filler and a specific foaming agent into the original system, the problems that an expansion film in the automobile production process has no damping function and is low in multiplying power are solved, so that the film has damping performance and high expansion multiplying power on the basis of sound absorption and insulation, the damping vibration attenuation performance is improved, the thickness of the film is reduced when the same cavity gap is sealed, and the cost can be reduced to a certain extent.)

1. A damping type high-magnification rubber expansion film for a vehicle is characterized by comprising the following components in percentage by weight: 38-42 parts of rubber, 55-57 parts of damping filler, 2 parts of vulcanizing agent, 0.2 part of accelerant and the balance of foaming agent, wherein one or more foaming agents are arranged.

2. The damping type high-rate rubber intumescent film for the vehicle as claimed in claim 1, wherein the foaming agent is 0.8-3.2 parts.

3. The damping type high-rate rubber expansion sheet for the vehicle as claimed in claim 2, wherein the foaming agent comprises one or both of an AC foaming agent and an OBSH foaming agent.

4. The damping type high-magnification rubber intumescent sheet for the vehicle as claimed in claim 3, characterized by comprising the following components by weight: 40 parts of rubber, 56.2 parts of damping filler, 2 parts of vulcanizing agent, 0.2 part of accelerant and 1.6 parts of foaming agent.

5. The damping type high-magnification rubber expansion sheet for the vehicle as claimed in claim 4, wherein the foaming agent comprises an AC foaming agent and an OBSH foaming agent in a compounding ratio of 1: 1.

6. The damping type high-magnification rubber intumescent sheet for the vehicle as claimed in claim 3, characterized by comprising the following components by weight: 38.4 parts of rubber, 56.2 parts of damping filler, 2 parts of vulcanizing agent, 0.2 part of accelerant and 3.2 parts of foaming agent.

7. A preparation method of a damping type high-magnification rubber expansion film for a vehicle comprises the following steps: a. weighing the raw materials according to the weight ratio; b. drying the damping filler; c. stirring and mixing the raw materials; d. molding and post-processing.

8. The method for preparing the damping type high-magnification rubber intumescent sheet for the vehicle as claimed in claim 7, wherein the step b comprises: the damping filler is dried for 8-12 hours at high temperature.

9. The method for preparing the damping type high-rate rubber intumescent film for the vehicle as claimed in claim 8, wherein the drying temperature in the step b is more than 80 ℃.

10. The method for preparing the damping type high-rate rubber intumescent sheet for the vehicle according to any one of claims 7 to 9, wherein the step c comprises the following steps: adding rubber into a stirring kettle and stirring uniformly; after the rubber is uniformly mixed, adding the damping filler into a stirring kettle; adding foaming agent, vulcanizing agent and accelerator.

Technical Field

The invention relates to the technical field of reinforcing rubber sheets, in particular to a damping type high-rate rubber expansion rubber sheet for a vehicle and a preparation method thereof.

Background

The damping rubber expansion film for the automobile is prepared by taking damping rubber as a base material and matching with a foaming agent and a vulcanizing agent, and has a foamed structure and damping performance. The main use has cavity structure's positions such as door, roof crossbeam, automobile body A/B/C post all around, vulcanizes the foaming bonding on the steel sheet after the electrophoresis process, and shutoff cavity structure plays the damping vibration damping, gives sound insulation and falls the effect of making an uproar, promotes whole car NVH performance. The prior rubber expansion film has the following defects in the application process: firstly, the rubber expansion film material generally has no damping function, only plays a role in sound insulation, and has no damping function; the secondary foaming ratio is generally low, the cavity cannot be effectively blocked, and when the cavity needs to be blocked, the thickness of the expansion film needs to be increased, so that the cost is increased.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a damping type high-rate rubber intumescent film for a vehicle and a preparation method thereof.

The invention is realized by the following technical scheme:

a damping type high-magnification rubber expansion film for a vehicle is characterized by comprising the following components in percentage by weight: 38-42 parts of rubber, 55-57 parts of damping filler, 2 parts of vulcanizing agent, 0.2 part of accelerant and the balance of foaming agent, wherein one or more foaming agents are arranged.

According to the technical scheme, preferably, the foaming agent is 0.8-3.2 parts.

According to the above technical solution, preferably, the foaming agent comprises one or both of an AC foaming agent and an OBSH foaming agent.

According to the technical scheme, the paint preferably comprises the following components in percentage by weight: 40 parts of rubber, 56.2 parts of damping filler, 2 parts of vulcanizing agent, 0.2 part of accelerant and 1.6 parts of foaming agent.

According to the technical scheme, preferably, the foaming agent comprises an AC foaming agent and an OBSH foaming agent with the compound ratio of 1: 1.

According to the technical scheme, the paint preferably comprises the following components in percentage by weight: 38.4 parts of rubber, 56.2 parts of damping filler, 2 parts of vulcanizing agent, 0.2 part of accelerant and 3.2 parts of foaming agent.

The patent also discloses a preparation method of the damping type high-rate rubber expansion film for the vehicle, which comprises the following steps: a. weighing the raw materials according to the weight ratio; b. drying the damping filler; c. stirring and mixing the raw materials; d. molding and post-processing.

According to the above technical solution, preferably, step b includes: the damping filler is dried for 8-12 hours at high temperature.

According to the above technical solution, preferably, the drying temperature in step b is above 80 ℃.

According to the above technical solution, preferably, step c includes: adding rubber into a stirring kettle and stirring uniformly; after the rubber is uniformly mixed, adding the damping filler into a stirring kettle; adding foaming agent, vulcanizing agent and accelerator.

The invention has the beneficial effects that:

according to the invention, by adding a certain proportion of damping filler and a specific foaming agent into the original system, the problems that an expansion film in the automobile production process has no damping function and is low in multiplying power are solved, so that the film has damping performance and high expansion multiplying power on the basis of sound absorption and insulation, the damping vibration attenuation performance is improved, the thickness of the film is reduced when the same cavity gap is sealed, and the cost can be reduced to a certain extent.

Drawings

FIG. 1 shows the raw materials and weight percentages of the damping type high-magnification rubber intumescent sheets of examples 1-6.

FIG. 2 shows the height ratio and damping coefficient of the damping type high ratio rubber intumescent sheets prepared in examples 1-6.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and preferred embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention comprises the following components by weight ratio: 38-42 parts of rubber, 55-57 parts of damping filler, 2 parts of vulcanizing agent, 0.2 part of accelerant and the balance of foaming agent, wherein one or more foaming agents are arranged. Preferably, the foaming agent is 0.8-3.2 parts, and the foaming agent comprises one or two of an AC foaming agent or an OBSH foaming agent. According to the invention, by adding a certain proportion of damping filler and a specific foaming agent into the original system, the problems that an expansion film in the automobile production process has no damping function and is low in multiplying power are solved, so that the film has damping performance and high expansion multiplying power on the basis of sound absorption and insulation, the damping vibration attenuation performance is improved, the thickness of the film is reduced when the same cavity gap is sealed, and the cost can be reduced to a certain extent.

As shown in FIG. 1, the raw materials and weight percentages of the damping type high-magnification rubber intumescent sheet in examples 1-6 are disclosed in FIG. 1.

The patent also discloses a preparation method of the damping type high-rate rubber expansion film for the vehicle, which comprises the following steps:

a. weighing the raw materials according to the weight ratio;

b. drying the damping filler: drying the damping filler at the temperature of more than 80 ℃ for 8-12 hours;

c. stirring and mixing the raw materials: adding rubber into a stirring kettle and stirring uniformly; after rubber is uniformly mixed, damping filler is added into a stirring kettle; adding foaming agent, vulcanizing agent and accelerator.

d. Forming and post-processing: and preparing the mixed raw materials into a sheet material with a certain thickness by using an open mill, and cutting the sheet material into a certain specification, shape and size according to requirements.

The resulting inflated films prepared according to examples 1-6 were tested for height magnification and damping coefficient.

The specific test method for the height multiplying power is as follows: the expansion rubber sheets prepared in examples 1 to 6 were cut into pieces of 40mm × 40mm in size, respectively, attached to a steel plate, laid flat in an oven at 180 ℃ and baked for 20min, taken out and left under experimental conditions for 12h, and then the height h of the heated rubber material was measured by calipers₁The height expansion ratio was calculated as follows.

η_{Height of}＝h₁/h₀×100％

Wherein eta is_{Height of}The high degree of expansion (%) of the sample, h₁Height (mm), h, of the sample after foaming₀The height (mm) of the sample before foaming. After the test, the average value of 3 tests is taken as the test result, and the result retains an integer.

The testing method of the damping coefficient is characterized in that the type b is selected according to the testing method specified in the national standard GB/T18258-2000 (damping material damping performance testing method), and the damping coefficient is tested.

As shown in fig. 2, the experimental results obtained by detecting the height magnification and the damping coefficient show that: according to the invention, by adding a certain proportion of damping filler and a specific foaming agent into the original system, the problems that an expansion film in the automobile production process has no damping function and is low in multiplying power are solved, so that the film has damping performance and high expansion multiplying power on the basis of sound absorption and insulation, the damping vibration attenuation performance is improved, the thickness of the film is reduced when the same cavity gap is sealed, and the cost can be reduced to a certain extent.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.