阅读说明：本技术 一种用于乘用车的点焊发泡密封胶材料及其制备方法和应用 (Spot-welding foaming sealant material for passenger car and preparation method and application thereof ) 是由 黄宏存 陈志峰 陈穆伟 朱清梅 于 2021-09-24 设计创作，主要内容包括：本发明涉及高分子技术领域,尤其涉及一种用于乘用车的点焊发泡密封胶条材料及其制备方法。所述点焊密发泡密封条,以质量分数计,由包括以下组分的原料制备得到：顺丁橡胶22～25％；丁苯橡胶10～14％；丁基橡胶5～7％；聚异丁烯15～20％；操作油20～23％；铝粉18～20％；N,N'-二亚硝基五亚甲基四胺1～1.5％；氧化锌0.5～0.75％；硬脂酸锌0.5～0.75％,所述各组分的用量之和为100％；所述顺丁橡胶、丁苯橡胶、丁基橡胶、聚异丁烯、操作油、铝粉、N,N'-二亚硝基五亚甲基四胺、氧化锌和硬脂酸锌均为市售常见原材料和助剂。各组分协同作用,最终制得的点焊密封条具有较优的隔音性能。(The invention relates to the technical field of macromolecules, in particular to a spot-welding foaming sealant strip material for a passenger car and a preparation method thereof. The spot-welding dense foaming sealing strip is prepared from the following raw materials in parts by mass: 22-25% of butadiene rubber; 10-14% of styrene butadiene rubber; 5-7% of butyl rubber; 15-20% of polyisobutylene; 20-23% of operating oil; 18-20% of aluminum powder; 1-1.5% of N, N' -dinitrosopentamethylenetetramine; 0.5-0.75% of zinc oxide; 0.5-0.75% of zinc stearate, wherein the sum of the using amount of each component is 100%; the butadiene rubber, the styrene butadiene rubber, the butyl rubber, the polyisobutylene, the operating oil, the aluminum powder, the N, N' -dinitrosopentamethylenetetramine, the zinc oxide and the zinc stearate are all common commercial raw materials and auxiliary agents. The components have synergistic effect, and the finally prepared spot welding sealing strip has better sound insulation performance.)

1. A spot welding foaming sealant strip material for passenger cars comprises the following raw materials in percentage by mass:

20-25% of butadiene rubber, 10-14% of butadiene styrene rubber, 5-7% of butyl rubber, 15-20% of polyisobutylene, 20-23% of operating oil, 18-20% of aluminum powder, 1-1.5% of N, N' -dinitrosopentamethylenetetramine, 0.5-0.75% of zinc oxide and 0.5-0.75% of zinc stearate.

2. The spot welded foamed sealant strip material for passenger cars according to claim 1, characterized in that the main component of said operating oil is hydrocarbons.

3. The spot welding foaming sealant strip material for passenger cars of claim 1, characterized in that the aluminum powder has a particle size of 580-620 meshes.

4. The spot weld foamed sealant strip material for passenger vehicles according to claim 1, wherein said butadiene rubber is selected from the group consisting of butadiene rubber of model BR 9000;

the styrene-butadiene rubber is selected from styrene-butadiene rubber of model 1010;

the butyl rubber is selected from butyl rubber model 268.

5. The spot welded foamed sealant strip material for passenger vehicles according to claim 1, wherein said sealant strip material comprises the following raw materials:

20% of butadiene rubber, 13% of butadiene styrene rubber, 7% of butyl rubber, 16% of polyisobutylene, 23% of operating oil, 19% of aluminum powder, 1.0% of N, N' -dinitrosopentamethylenetetramine, 0.5% of zinc oxide and 0.5% of zinc stearate;

or comprises 22 percent of butadiene rubber, 12 percent of butadiene styrene rubber, 6 percent of butyl rubber, 17 percent of polyisobutylene, 22 percent of operating oil, 19 percent of aluminum powder, 1.2 percent of N, N' -dinitrosopentamethylenetetramine, 0.6 percent of zinc oxide and 0.6 percent of zinc stearate;

or comprises 24 percent of butadiene rubber, 13 percent of butadiene styrene rubber, 7 percent of butyl rubber, 19 percent of polyisobutylene, 23 percent of operating oil, 20 percent of aluminum powder, 1.4 percent of N, N' -dinitrosopentamethylenetetramine, 0.7 percent of zinc oxide and 0.7 percent of zinc stearate.

6. A method for preparing a spot welded foamed sealant strip material for passenger cars according to any one of claims 1 to 5, comprising the steps of:

20-25% of butadiene rubber, 10-14% of butadiene styrene rubber, 5-7% of butyl rubber, 15-20% of polyisobutylene, 20-23% of operating oil, 18-20% of aluminum powder, 1-1.5% of N, N' -dinitrosopentamethylenetetramine, 0.5-0.75% of zinc oxide and 0.5-0.75% of zinc stearate are mixed and banburied for 2.5-3.5 hours at the temperature of 70-80 ℃, and the obtained semi-finished product is cured and extruded to obtain the spot welding foaming sealant strip material for passenger cars.

7. The preparation method according to claim 6, wherein the curing temperature is 23-25 ℃, the curing time is 22-26 h, and the curing humidity is 45-55%.

8. The method according to claim 6, wherein the temperature of the extrusion is 70 to 80 ℃.

9. The application of the spot welding foaming sealant strip material according to any one of claims 1 to 5 or the spot welding foaming sealant strip material prepared by the preparation method according to any one of claims 6 to 8 to the lap joint part of a steel plate with uneven thickness or complex cavity shape.

Technical Field

The invention belongs to the technical field of sealants, and particularly relates to a spot-welding foaming sealant material for a passenger car and a preparation method and application thereof.

Background

Along with the continuous improvement of living standard, more and more passenger cars have walked into thousands of households, and people also put forward higher and higher requirements on the comfort of the passenger cars, and the control level of noise in the cars is one of indexes of comfort. If a lot of gaps and cavities are formed in the vehicle body, and if the gaps and the cavities are not sealed, tire noise and wind noise can enter the vehicle through the paths, so that the noise in the vehicle is increased sharply, and if the gaps and the cavities are sealed by dense welding points, the cost is increased, and the efficiency is reduced. But the sealing effect is good if the sealing strip is used for assisting a small number of welding points to seal. The sealing strip can seal each dead angle, blocks the passageway of noise, and structural strength has been guaranteed again to the solder joint of appropriate quantity, has also improved efficiency when practicing thrift the cost.

CN104479603A discloses a vehicle body spot welding sealant which is coated on the lap joint part of a steel plate in advance before use and can fill up a gap after spot welding. However, when the thickness of the cavity is not uniform or the shape of the cavity is complicated, the sealing is easily not firm, and the noise in the passenger car is rapidly increased. Therefore, the sealant has strict limitation on the use position, has high requirements on the size of the vehicle body part and the assembly process level, and limits the application of the sealant.

Disclosure of Invention

In view of the above, the present invention is directed to a spot welding foaming sealant material for passenger cars, which can be foamed to seal a steel plate lap joint part with uneven thickness or a complicated cavity shape, and a preparation method and an application thereof.

The invention provides a spot welding foaming sealant strip material for a passenger car, which comprises the following raw materials in parts by mass:

20-25% of butadiene rubber, 10-14% of butadiene styrene rubber, 5-7% of butyl rubber, 15-20% of polyisobutylene, 20-23% of operating oil, 18-20% of aluminum powder, 1-1.5% of N, N' -dinitrosopentamethylenetetramine, 0.5-0.75% of zinc oxide and 0.5-0.75% of zinc stearate.

In the present invention, the main component of the process oil is hydrocarbons.

In the invention, the granularity of the aluminum powder is 580-620 meshes, and more preferably 600 meshes.

In an embodiment of the invention, the butadiene rubber is selected from butadiene rubber of type BR 9000;

the styrene-butadiene rubber is selected from styrene-butadiene rubber of model 1010;

the butyl rubber is selected from butyl rubber model 268.

In the present invention, the polyisobutylene is a transparent semi-solid; preferably from the polyisobutenes of type 1400.

In the invention, the sealant strip material comprises the following raw materials:

20% of butadiene rubber, 13% of butadiene styrene rubber, 7% of butyl rubber, 16% of polyisobutylene, 23% of operating oil, 19% of aluminum powder, 1.0% of N, N' -dinitrosopentamethylenetetramine, 0.5% of zinc oxide and 0.5% of zinc stearate;

or comprises 22 percent of butadiene rubber, 12 percent of butadiene styrene rubber, 6 percent of butyl rubber, 17 percent of polyisobutylene, 21 percent of operating oil, 20 percent of aluminum powder, 0.8 percent of N, N' -dinitrosopentamethylenetetramine, 0.6 percent of zinc oxide and 0.6 percent of zinc stearate;

or comprises 24 percent of butadiene rubber, 11 percent of butadiene styrene rubber, 5 percent of butyl rubber, 19 percent of polyisobutylene, 21 percent of operating oil, 18 percent of aluminum powder, 1 percent of N, N' -dinitrosopentamethylenetetramine, 0.5 percent of zinc oxide and 0.5 percent of zinc stearate.

The invention provides a preparation method of a spot welding foaming sealant strip material for a passenger car, which comprises the following steps:

20-25% of butadiene rubber, 10-14% of butadiene styrene rubber, 5-7% of butyl rubber, 15-20% of polyisobutylene, 20-23% of operating oil, 18-20% of aluminum powder, 1-1.5% of N, N' -dinitrosopentamethylenetetramine, 0.5-0.75% of zinc oxide and 0.5-0.75% of zinc stearate are mixed and banburied for 2.5-3.5 hours at the temperature of 70-80 ℃, and the obtained semi-finished product is cured and extruded to obtain the spot welding foaming sealant strip material for passenger cars.

In the invention, the curing temperature is 23-25 ℃, the curing time is 22-26 h, and the curing humidity is 45-55%.

In the invention, the extrusion temperature is 70-80 ℃.

The invention provides an application of the spot welding foamed sealant strip material in the technical scheme or the spot welding foamed sealant strip material prepared by the preparation method in the technical scheme to the lap joint part of a steel plate with uneven thickness or complex cavity shape.

The invention provides a spot welding foaming sealant strip material for a passenger car, which comprises the following raw materials in parts by mass: 20-25% of butadiene rubber, 10-14% of butadiene styrene rubber, 5-7% of butyl rubber, 15-20% of polyisobutylene, 20-23% of operating oil, 18-20% of aluminum powder, 1-1.5% of N, N' -dinitrosopentamethylenetetramine, 0.5-0.75% of zinc oxide and 0.5-0.75% of zinc stearate. The sealant strip material provided by the invention is cut according to the requirement, adhered to a steel plate by virtue of the initial adhesive force of the sealant strip material, and then can be foamed in the paint baking process of welding, so that the sealant strip material can be used for sealing the lap joint part of the steel plate with uneven thickness or complex cavity shape. The material can be foamed, and can absorb noise more easily, so that the sound insulation effect is better.

Detailed Description

In order to further illustrate the present invention, the following examples are provided to describe a spot welding foamed sealant strip material for passenger cars and the preparation method and application thereof in detail, but they should not be construed as limiting the scope of the present invention.

Examples 1 to 3

Weighing the raw materials according to the types and the use amounts of the raw materials in the table 1 for later use;

mixing butadiene rubber, styrene butadiene rubber, butyl rubber, polyisobutylene, operating oil, aluminum powder, N' -dinitrosopentamethylenetetramine, zinc oxide and zinc stearate, banburying for 3 hours at 70-80 ℃, curing the obtained semi-finished product for 24 hours in an environment with the temperature of 23-25 ℃ and the humidity of 50%, and extruding at 70-80 ℃ to obtain the spot welding foaming sealant strip material for the passenger car.

Comparative example 1

In contrast to example 2, N' -dinitrosopentamethylenetetramine was not used.

Comparative example 2

In contrast to example 2, N' -dinitrosopentamethylenetetramine was replaced by azodicarbonamide.

Comparative example 3

Compared with example 2, the aluminum powder was replaced with carbon black.

The invention foams the spot welding foaming sealant strip material for passenger cars for 15min at 180 ℃, and the foaming ratio is measured as follows: and measuring the volume of the sample block before and after foaming by adopting drainage foaming, and calculating to obtain the foaming ratio.

Measurement of Sound insulation amount: the sealing rubber strip materials prepared in examples 1 to 3 and comparative examples 1 to 3 were respectively prepared into wafers with a diameter of 100mm and a thickness of 10mm, and the sound insulation amount was measured by a standing wave tube method.

TABLE 1 results of performance testing of the sealer strip materials prepared in the examples and comparative examples

From the above embodiments, the invention provides a spot welding foaming sealant strip material for passenger cars, which comprises the following raw materials in percentage by mass: 20-25% of butadiene rubber, 10-14% of butadiene styrene rubber, 5-7% of butyl rubber, 15-20% of polyisobutylene, 20-23% of operating oil, 18-20% of aluminum powder, 1-1.5% of N, N' -dinitrosopentamethylenetetramine, 0.5-0.75% of zinc oxide and 0.5-0.75% of zinc stearate. The sealant strip material provided by the invention is cut according to the requirement, adhered to a steel plate by virtue of the initial adhesive force of the sealant strip material, and then can be foamed in the paint baking process of welding, so that the sealant strip material can be used for sealing the lap joint part of the steel plate with uneven thickness or complex cavity shape. The material can be foamed, and can absorb noise more easily, so that the sound insulation effect is better.

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.