阅读说明：本技术 一种用于白车身的膨胀隔震胶及其制备方法 (Expansion shock insulation glue for body-in-white and preparation method thereof ) 是由 戴耿磊 方海鹏 李登辉 盛卓翰 于 2021-11-17 设计创作，主要内容包括：本发明公开了一种用于白车身的膨胀隔震胶,包括以下按重量百分比计的组分：合成橡胶10-12％；顺丁橡胶3-5％；环氧树脂3-5％；色素0.2-0.4％；填充剂37-41％；吸湿剂2-4％；固化剂1.3-2.5％；发泡剂0.4-0.6％；添加剂8-12％；增塑剂22-27％,所述色素为炭黑。本发明还提供一种用于白车身的膨胀隔震胶的制备方法,包括如下步骤：步骤1：称重配料,按规定计量对各组分原料进行称重,并将称取的原料按顺序投入1吨挰合机中进行两次配料；步骤2：真空搅拌,对配制好的原料进行真空搅拌；步骤3：粘度检查及调整,将一次真空搅拌后的产品进行粘度检查,检查后进行二次真空搅拌以进行粘度调整,二次真空搅拌时,直至产品达到规定的性能指标并制得膨胀隔震胶成品。(The invention discloses an expansion shock insulation glue for a body-in-white, which comprises the following components in percentage by weight: 10-12% of synthetic rubber; 3-5% of butadiene rubber; 3-5% of epoxy resin; 0.2 to 0.4 percent of pigment; 37-41% of a filling agent; 2-4% of a moisture absorbent; 1.3 to 2.5 percent of curing agent; 0.4 to 0.6 percent of foaming agent; 8-12% of additive; 22-27% of plasticizer, and the pigment is carbon black. The invention also provides a preparation method of the expansion shock insulation glue for the body-in-white, which comprises the following steps: step 1: weighing and batching, weighing the raw materials of each component according to the specified measurement, and putting the weighed raw materials into a 1-ton mixer in sequence for twice batching; step 2: vacuum stirring, namely performing vacuum stirring on the prepared raw materials; and step 3: and (3) viscosity checking and adjusting, namely checking the viscosity of the product subjected to the primary vacuum stirring, performing secondary vacuum stirring after checking to adjust the viscosity, and performing secondary vacuum stirring until the product reaches the specified performance index and the finished product of the expansion shock insulation glue is prepared.)

1. The utility model provides an inflation shock insulation is glued for white automobile body which characterized in that: comprises the following components in percentage by weight:

2. the expansion shock insulation glue for the body-in-white according to claim 1, characterized in that: the pigment is carbon black.

3. A preparation method of expansion shock insulation glue for a body-in-white is characterized by comprising the following steps: the method comprises the following steps:

step 1: weighing and batching, weighing the raw materials of each component according to the specified measurement, and putting the weighed raw materials into a 1-ton mixer in sequence for twice batching;

step 2: vacuum stirring, namely performing vacuum stirring on the prepared raw materials;

and step 3: checking and adjusting the viscosity, namely checking the viscosity of the product subjected to the primary vacuum stirring, performing secondary vacuum stirring after checking to adjust the viscosity, and performing secondary vacuum stirring until the product reaches a specified performance index and a finished product of the expansion shock insulation glue is prepared;

and 4, step 4: filtering, metering and packaging the product, transferring the finished product of the expanded shock insulation glue to a packaging tank, and filtering and packaging the product;

the expansion shock insulation glue comprises the following components in percentage by weight:

4. the method for preparing the expansion shock insulation glue for the body-in-white according to claim 3, characterized in that: and (3) carrying out vacuum stirring in the step (2), wherein the defoaming stirring time is 40 +/-5 min, the stirring temperature is below 50 ℃, and the stirring vacuum pressure is-0.08 to-0.1 MPa.

5. The method for preparing the expansion shock insulation glue for the body-in-white according to claim 3, characterized in that: and 3, carrying out secondary vacuum stirring in the step 3, wherein the defoaming stirring time is 40 +/-5 min, the stirring temperature is below 50 ℃, and the stirring vacuum pressure is-0.08 to-0.1 MPa.

6. The method for preparing the expansion shock insulation glue for the body-in-white according to claim 3, characterized in that: in the step 4, when filtering and packaging are carried out, the filter screen is 40 meshes, and the pressure is 5-10 MPa.

Technical Field

The invention relates to the field of production of expansion shock insulation glue, in particular to expansion shock insulation glue for a body-in-white and a preparation method thereof.

Background

The body of the motor vehicle is formed by stamping a metal plate and connecting the metal plate by spot welding. The expanded glue is required to be used in a spot welding assembly process and is used for filling cavity positions inside a vehicle body and positions with insufficient metal plate strength of the vehicle body and filling lap joints and matching gaps between metal plates so as to avoid the problems of metal plate resonance, air flow movement and the like, meet the requirements of damping, noise reduction and NVH (noise, vibration and harshness) of the whole vehicle in the driving process and the like, ensure the performance requirements of sealing and vibration prevention of the vehicle body, improve the comfort of the whole vehicle and the like, and glue is required to be applied to the vehicle body. The invention can mainly realize the functions which the traditional expansion damping rubber does not have, and meet the special requirements of the vehicle body structure on the strength, the damping and the adhesive force of the rubber.

The expansion damping rubber is mainly used between inner and outer plates of an engine hood, a top cover, a side wall, a vehicle door and the like, and is used for improving the rigidity of the outer plate, weakening vibration and noise in driving and increasing the comfort of the whole vehicle.

As shown in fig. 1, taking the filling of the expansion damping rubber between the top cover and the top cover beam of a certain vehicle as an example, the filling of the expansion damping rubber between the top cover and the top cover beam is performed by using the traditional expansion damping rubber (i) and the traditional expansion damping rubber (ii), wherein the specific parameters of the traditional expansion damping rubber (i) and the traditional expansion damping rubber (ii) are as follows:

the expansion damping rubber has expansion rate of 40 +/-3, viscosity (CPS) of 160-260 ten thousand and shearing strength of 2-4kg.f/cm²；

Expansion damping rubber with expansion rate of 60 +/-5, viscosity (CPS) of 20-40 ten thousand and shearing strength of 2 +/-1 kg.f/cm²。

And (4) conclusion: because of reasons such as product structural design, this motorcycle type top cap and top cap crossbeam are closing the middle door, the panel beating vibration amplitude is great when the road is tried, the vibrations frequency is on the high side, "traditional inflation damping rubber (first)" and "traditional inflation damping rubber (second)" the colloid between the panel beating can not effectively be attached to the panel beating surface, the cooperation degree can not be controlled between the panel beating after filling, intensity is difficult to effectively support the pressure that external factor given the panel beating, lead to planking and crossbeam cooperation to appear gap, resonance, air current drunkenness scheduling problem.

Disclosure of Invention

The invention aims to provide an expansion shock insulation glue for a body-in-white and a preparation method thereof, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

an expansion shock insulation glue for a body-in-white comprises the following components in percentage by weight:

10-12% of synthetic rubber;

3-5% of butadiene rubber;

3-5% of epoxy resin;

0.2 to 0.4 percent of pigment;

37-41% of a filling agent;

2-4% of a moisture absorbent;

1.3 to 2.5 percent of curing agent;

0.4 to 0.6 percent of foaming agent;

8-12% of additive;

22-27% of plasticizer.

As a further scheme of the invention: the pigment is carbon black.

The invention also provides a preparation method of the expansion shock insulation glue for the body-in-white, which comprises the following steps:

step 1: weighing and batching, weighing the raw materials of each component according to the specified measurement, and putting the weighed raw materials into a 1-ton mixer in sequence for twice batching;

step 2: vacuum stirring, namely performing vacuum stirring on the prepared raw materials;

and step 3: checking and adjusting the viscosity, namely checking the viscosity of the product subjected to the primary vacuum stirring, performing secondary vacuum stirring after checking to adjust the viscosity, and performing secondary vacuum stirring until the product reaches a specified performance index and a finished product of the expansion shock insulation glue is prepared;

and 4, step 4: and (3) filtering, metering and packaging the product, transferring the finished product of the expansion shock insulation glue to a packaging tank, and filtering and packaging the product.

As a further scheme of the invention: and (3) carrying out vacuum stirring in the step (2), wherein the defoaming stirring time is 40 +/-5 min, the stirring temperature is below 50 ℃, and the stirring vacuum pressure is-0.08 to-0.1 MPa.

As a further scheme of the invention: and 3, carrying out secondary vacuum stirring in the step 3, wherein the defoaming stirring time is 40 +/-5 min, the stirring temperature is below 50 ℃, and the stirring vacuum pressure is-0.08 to-0.1 MPa.

As a further scheme of the invention: in the step 4, when filtering and packaging are carried out, the filter screen is 40 meshes, and the pressure is 5-10 MPa.

Compared with the prior art, the invention has the beneficial effects that:

the solvent-free reaction type expansion glue using the synthetic rubber as the base material has the advantages that all performances can reach higher technical standards, the expansion glue can be conveyed by a high-pressure pump/a manual pneumatic glue gun at room temperature, chemical crosslinking is carried out at the temperature of over 140 ℃, a cured product has high flexibility, good adhesion to an oily steel plate, good sagging resistance, flushing resistance without pregelling or precuring, and the influence of a water-based cleaning agent and a pretreating agent used on an automobile production line is prevented.

Drawings

FIG. 1 is a schematic diagram of an application scenario of an expansion seismic isolation adhesive in the background art;

FIG. 2 is a composition ratio table of the expansion shock insulation glue of the invention;

FIG. 3 is a flow chart of the production process of the expansion shock-insulation glue of the invention;

FIG. 4 shows the standard of the present invention.

Detailed Description

To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.

Referring to fig. 2, fig. 2 is a composition ratio table of the expansion shock insulation glue.

Referring to fig. 3, fig. 3 is a production process flow chart of the expansion shock insulation glue.

Example 1:

the embodiment provides an expansion shock insulation glue for a body-in-white, which comprises the following components in percentage by weight:

10% of synthetic rubber;

5% of butadiene rubber;

3% of epoxy resin;

0.4% of pigment;

37% of a filler;

4% of a moisture absorbent;

1.3 percent of curing agent;

0.6 percent of foaming agent;

12% of an additive;

and 26.7% of a plasticizer.

In this example, carbon black was used as a pigment to increase rubber coloration.

The specific preparation method comprises the following steps:

step 1: weighing and batching, namely weighing the raw materials of the components according to the weight percentage, checking the appearance, the identification and the physical characteristics of the raw materials to ensure the quality of the raw materials, and sequentially putting the weighed raw materials into a 1-ton mixing machine for twice batching;

step 2: vacuum stirring, namely performing vacuum stirring on the prepared raw materials, wherein the defoaming stirring time is 40 +/-5 min, the stirring temperature is below 50 ℃, and the stirring vacuum pressure is-0.08 to-0.1 MPa;

and step 3: viscosity inspection and adjustment, wherein the product subjected to primary vacuum stirring is subjected to viscosity inspection, secondary vacuum stirring is performed after inspection so as to adjust the viscosity, the defoaming stirring time is 40 +/-5 min during secondary vacuum stirring, the stirring temperature is below 50 ℃, and the stirring vacuum pressure is-0.08 to-0.1 MPa until the product reaches the specified performance index and the finished product of the expansion shock insulation glue is prepared;

and 4, step 4: and (3) filtering, metering and packaging the product, transferring the finished product of the expanded shock insulation glue to a packaging tank, filtering and packaging the product, wherein a filter screen is 40 meshes, the pressure is 5-10 MPa, and no foreign matter is in the packaging tank during transfer.

Example 2:

the embodiment provides an expansion shock insulation glue for a body-in-white, which comprises the following components in percentage by weight:

12% of synthetic rubber;

3% of butadiene rubber;

5% of epoxy resin;

0.2 percent of pigment;

39.9% of a filler;

2% of a moisture absorbent;

2.5 percent of curing agent;

0.4 percent of foaming agent;

8% of an additive;

and 27% of plasticizer.

In this example, carbon black was used as a pigment to increase rubber coloration.

The specific preparation method is substantially the same as that of example 1.

Example 3:

the embodiment provides an expansion shock insulation glue for a body-in-white, which comprises the following components in percentage by weight:

11% of synthetic rubber;

4% of butadiene rubber;

4% of epoxy resin;

0.3 percent of pigment;

41% of a filler;

3% of a moisture absorbent;

2.2 percent of curing agent;

0.5 percent of foaming agent;

12% of an additive;

and 22% of plasticizer.

In this example, carbon black was used as a pigment to increase rubber coloration.

The specific preparation method is substantially the same as that of example 1.

The results of the performance tests of the finished products obtained in the three examples are shown in table 1:

TABLE 1

According to the detection result, compared with the technical standard shown in figure 4, the solvent-free reaction type expansion glue taking the synthetic rubber as the base material can reach higher technical standard in all properties, can be conveyed by a high-pressure pump/a manual pneumatic glue gun at room temperature, generates chemical crosslinking at the temperature of more than 140 ℃, and has high flexibility after being cured. The water-based cleaning agent has good adhesion to an oily steel plate, good sagging resistance, flushing resistance without pregelling or precuring, and can prevent the influence of water-based cleaning agents and pretreatment agents used on automobile production lines, the components of the water-based cleaning agent do not contain harmful substances specified by regulations, unpleasant feeling or peculiar smell can not be generated in normal operation, the water-based cleaning agent is not harmful to skin, eyes, respiratory tracts and the like, and the water-based cleaning agent can not be in bad states which affect the quality such as discoloration, precipitation, separation, stink and the like after being placed for 8 months under the condition of storage without direct light.

The test for testing the expansion shock insulation glue is as follows:

firstly, carry out experimental contrast with this novel inflation shock insulation glue and traditional inflation shock insulation glue, the result is as follows:

1. adhesion of sheet metal

Using ten sheet metal test pieces with the specification of 200 × 80mm, removing oil in five pairs, and removing no oil in five pairs. The oil removing method is characterized in that a test piece soaked and washed by cleaning oil of a 120-degree stamping part is wiped and dried by dust-free paper for later use, and the original oil test piece is not cleaned without removing oil. And (3) coating the oil removing test piece with the expansion shock insulation glue, and carrying out viscosity test comparison after washing and electrophoretic baking, as shown in table 2.

The difference between the adhesion values of the metal plates of the oil-removing test piece and the oil-containing test piece is about 20 ten thousand, but the adhesion values of the metal plates of the oil-removing test piece and the oil-containing test piece both meet the requirements of an experimental method Q/JQ 11059-20104.3, and the oil surface adhesion of the novel expansion shock insulation glue is good.

2. Lap shear strength

With thirty sheets of panel beating 200 x 80mm specification test block, use traditional inflation shock insulation to glue (r) and traditional inflation shock insulation glue (r) to paint and carry out welded connection with two test blocks, each preparation 5 groups, use novel inflation shock insulation to glue to paint and carry out welded connection with two test blocks, preparation 5 groups, fifteen groups of test blocks all carry out and test shear strength value according to shear strength test block preparation requirement, compare as table 3.

The shear strength value difference between the traditional expansion shock-insulation glue (I) and the traditional expansion shock-insulation glue (II) and the novel expansion shock-insulation glue test piece is about 1-2 kg.f/cm2, but the requirements of an experimental method Q/JQ 11154-20125.2 are met, and the shear strength of the novel expansion shock-insulation glue is good.

3. Expansion ratio:

with thirty sheets of panel beating 200 x 80mm specification test block, use traditional inflation shock insulation glue (first) and traditional inflation shock insulation glue (second) to paint and carry out welded connection with two test blocks, each preparation 5 groups, use novel inflation shock insulation glue to paint and carry out welded connection with two test blocks, preparation 5 groups, fifteen groups test block all go on and measure the expansion ratio according to the experimental preparation requirement of expansion ratio, compare as table 4. The expansion rate difference between the traditional expansion shock-insulation glue (i) and the traditional expansion shock-insulation glue (ii) and a test piece is about 30% and 10%, but the requirements of an experimental method Q/JQ 11059-20104.6 are met, and the novel expansion shock-insulation glue is good in expansibility.

4. Flushing test of phosphating system

The method comprises the steps of respectively coating three rubber strips of novel expansion shock insulation glue and three rubber strips of traditional expansion shock insulation glue on six cold-rolled plates with oil, placing the rubber strips with the size phi of 3mm multiplied by 200mm at room temperature for 32 hours, then carrying out procedures of oil removal, washing with water, phosphating, washing with water and the like together along with a vehicle, stopping a production line for one quarter in a test, and prolonging the procedure time. Test results show that under the condition of longer washing time than actual production, 6 samples in total keep the adhesive tape intact, the adhesive tape is not washed away by a phosphating system, the adhesive tape is not deformed, a phosphating film on a part without being coated with glue is good, and the novel expansion shock-insulation glue meets the requirements of phosphating washing resistance.

5. Phosphating flushing and electrophoretic painting test in welding test time

Coating a novel expansion shock insulation glue between two samples of 25mm x 100mm x lmm, wherein the thickness of a glue film is about 0.5-0.8 mm, spot-welding a point in the middle of a combined sample, weighing before phosphating, drying water after phosphating, weighing, and then carrying out electrophoretic coating. The samples were divided into three groups and the test results are shown in Table 5.

As can be seen from Table 7, the weight gains of the three groups of test pieces are substantially consistent, which indicates that the expansion glue is not washed away during phosphating washing. In addition, the electrophoresis paint films of the three test pieces are smooth and have no shrinkage or other defects, which shows that the novel expansion shock insulation glue has no adverse effect on the quality of the electrophoresis paint. The test results show that the novel expansion shock insulation glue has good matching property with a paint production system.

Second, other test methods and results

1. Novel inspection of connection state of top beam and top cover after expansion of expansion shock insulation glue

2000 verification units are used for line passing verification, the novel expansion shock insulation glue is well filled with the top cover and the top beam, the sticking is reliable, and no separation phenomenon exists.

2. Reliability test and road test results

Closing the middle door for verification: and (4) passing line verification 2000 test results, opening and closing the door for 5 times, and obtaining test results, wherein no ceiling area vibrates to make abnormal sound. And 5 groups of vehicles are selected, door opening and closing verification is carried out for 2000 times, and the abnormal sound is sounded by the vibration of the beam glue falling off in the area without the ceiling according to the test result.

Road test: the line passing verification 2000 tests show that the abnormal sound is not generated in the ceiling area due to the fact that the vehicle is driven at the speed of 20-40 km/H, the vehicle is driven in a standard test field, the driving height difference is larger than or equal to 60mm, the vehicle is bumped in an array mode, the vehicle is driven on a cobble working condition road surface, and the line passing verification 2000 tests show that the abnormal sound is generated in the ceiling area.

3. Reliability road test: 2 of Ruifeng M3 vehicle types, four high and one cold tests, and test results show that no ceiling area vibrates to make abnormal sounds.

4. Evaluation of production applications

The novel expansion shock insulation glue is tried and used by Jianghuai MPV automobile companies at present, and the result is as follows:

the novel expansion shock insulation glue is coated on a common steel plate or a galvanized steel plate containing anti-rust oil according to the standard when used on a white automobile body welding field, and the use proves that the novel expansion shock insulation glue is used in the storage period, has good extrusion flow property and is unblocked in a pipeline. The welded white car body assembly does not generate any bad phenomenon after passing through a painting system, and meets the process standard and the field use requirement.

5. Conclusion

Various performance indexes of the novel expansion shock insulation glue meet the standard requirements, the metal plate filling and sticking effect is met, the shock insulation effect is good, and abnormal vibration and abnormal sound are avoided during road test and normal running.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrases "comprising … …" or "comprising … …" does not exclude the presence of additional elements in a process, method, article, or terminal that comprises the element. Further, herein, "greater than," "less than," "more than," and the like are understood to exclude the present numbers; the terms "above", "below", "within" and the like are to be understood as including the number.

Although the embodiments have been described, once the basic inventive concept is obtained, other variations and modifications of these embodiments can be made by those skilled in the art, so that the above embodiments are only examples of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes using the contents of the present specification and drawings, or any other related technical fields, which are directly or indirectly applied thereto, are included in the scope of the present invention.