阅读说明：本技术 一种全防水蓄电池包发泡隔音垫的制作方法 (Manufacturing method of full-waterproof storage battery pack foaming sound insulation pad ) 是由 刘肖 于 2020-11-26 设计创作，主要内容包括：本发明涉及一种全防水蓄电池包发泡隔音垫的制作方法,该方法包括以下步骤：(1)将口袋式PE防水膜放置于模具下模相应位置,并使口袋式PE防水膜吸附在下模上；(2)将聚氨酯发泡料浇注到下模模腔中,待聚氨酯发泡料开始发泡时,立即将上模与下模合模,进行保压；(3)保压完成后,打开模具,将聚氨酯泡沫取出,并修剪聚氨酯发泡后多出的聚氨酯泡沫飞边；(4)将口袋式PE防水膜包覆聚氨酯泡沫,然后进行封口,得到全防水蓄电池包发泡隔音垫。与现有技术相比,本发明具有易固定、密度低、成本低等优点。(The invention relates to a method for manufacturing a full waterproof storage battery pack foaming sound insulation pad, which comprises the following steps: (1) placing the pocket type PE waterproof film at a corresponding position of a lower die of the die, and adsorbing the pocket type PE waterproof film on the lower die; (2) pouring a polyurethane foaming material into a lower die cavity, immediately closing the upper die and the lower die when the polyurethane foaming material begins to foam, and maintaining the pressure; (3) after the pressure maintaining is finished, opening the mold, taking out the polyurethane foam, and trimming excessive polyurethane foam flashes after the polyurethane foam is foamed; (4) and (3) coating polyurethane foam on the pocket type PE waterproof film, and then sealing to obtain the fully waterproof storage battery pack foamed sound insulation pad. Compared with the prior art, the invention has the advantages of easy fixation, low density, low cost and the like.)

1. A manufacturing method of a full waterproof storage battery pack foaming sound insulation pad is characterized by comprising the following steps:

(1) fixing a single PE waterproof film on an upper die of a die in an adsorption manner, placing a pocket type PE waterproof film at a corresponding position of a lower die of the die, and adsorbing the pocket type PE waterproof film on the lower die;

(2) pouring a polyurethane foaming material into a lower die cavity, immediately closing the upper die and the lower die when the polyurethane foaming material begins to foam, and maintaining the pressure;

(3) after pressure maintaining is finished, opening the mold, taking out the polyurethane foam with the PE waterproof film, peeling off polyurethane foam flash generated at the parting surface position of the upper mold and the lower mold after polyurethane foaming from the PE waterproof film, and trimming off the polyurethane foam flash by using a cutter;

(4) and coating the polyurethane foam subjected to trimming of the flash with the PE waterproof film, and then sealing each side of the PE waterproof film to obtain the fully waterproof storage battery pack foamed sound insulation pad.

2. The method for manufacturing a fully waterproof battery pack foam sound insulation pad according to claim 1, wherein the pocket type PE waterproof membrane comprises a single PE waterproof upper membrane and an open type PE waterproof lower membrane.

3. The method for manufacturing the fully waterproof battery pack foam sound insulation pad according to claim 1, wherein the pocket type PE waterproof film is adsorbed on the lower die in a vacuum adsorption mode.

4. The method for manufacturing the fully waterproof battery pack foam sound insulation pad according to claim 1, wherein an interference edge is reserved on the periphery of the pocket type PE waterproof film and is abutted against the side wall of the lower die.

5. The method for making a fully waterproof battery pack foam noise insulation pad according to claim 4, wherein the interference edges are coated with a release agent.

6. The manufacturing method of the fully waterproof battery pack foaming sound insulation pad according to claim 4, wherein the width of the interference edge is 9.5-10.5 mm.

7. The method for manufacturing a foam sound insulation pad for a waterproof accumulator pack according to claim 1, wherein a gap for exhausting gas generated during foaming is left between the upper die and the lower die when the dies are closed.

8. The method for manufacturing the fully waterproof battery pack foamed sound insulation pad according to claim 1, wherein the pressure holding time is 75-85 s; when foaming, the temperature of the mould is 60-70 ℃.

9. The method for manufacturing the fully waterproof battery pack foaming sound insulation pad according to claim 1, wherein the density of the polyurethane foam is 55-60kg/m³。

10. The method for manufacturing the fully waterproof battery pack foam sound insulation pad according to claim 1, wherein the PE waterproof film is made of LDPE and has a thickness of 0.03-0.05 mm.

Technical Field

The invention relates to the field of sound insulation pad manufacturing, in particular to a manufacturing method of a full-waterproof storage battery pack foaming sound insulation pad.

Background

At electric automobile vehicle driving in-process, can transmit sound and automobile body shake, then, be located and be equipped with the vibration isolator between the battery package of vehicle bottom and the automobile body floor panel beating, because traditional vibration isolator foam or soundproof cotton do not have waterproof effect, can't normal use after meeting water, cause whole car NVH problem can't improve.

In addition, the existing vibration isolator is difficult to fix and easy to fall off; the waterproof paint is not waterproof, and can damage and corrode a battery and a vehicle body metal plate after meeting water; the vibration isolation pad product has high density and high price.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a method for manufacturing a full waterproof storage battery pack foaming sound insulation pad which is easy to fix, low in density and low in cost.

The purpose of the invention can be realized by the following technical scheme:

a method for manufacturing a full waterproof storage battery pack foaming sound insulation pad comprises the following steps:

(1) fixing a single PE waterproof film on an upper die of a die in an adsorption manner, placing a pocket type PE waterproof film at a corresponding position of a lower die of the die, and adsorbing the pocket type PE waterproof film on the lower die;

(2) pouring a polyurethane foaming material into a lower die cavity, immediately closing the upper die and the lower die when the polyurethane foaming material begins to foam, and maintaining the pressure;

(3) after pressure maintaining is finished, opening the mold, taking out the polyurethane foam with the PE waterproof film, peeling off polyurethane foam flash generated at the parting surface position of the upper mold and the lower mold after polyurethane foaming from the PE waterproof film, and trimming off the polyurethane foam flash by using a cutter;

(4) and coating the polyurethane foam subjected to trimming of the flash with the PE waterproof film, and then sealing each side of the PE waterproof film to obtain the fully waterproof storage battery pack foamed sound insulation pad.

Further, the PE waterproof membrane comprises a single piece of PE waterproof upper membrane and a pocket type PE waterproof membrane. If the PE waterproofing membrane is compared to a pocket, the single piece of PE waterproofing upper membrane is the top of the pocket, and the pocket type PE waterproofing membrane is the other part of the pocket except for the opening.

Further, the pocket type PE waterproof film is adsorbed on the lower die in a vacuum adsorption mode.

Furthermore, an interference edge is reserved on the periphery of the pocket type PE waterproof membrane and is abutted against the side wall of the lower die.

Further, the interference edge is coated with a release agent. The PE waterproof film is prevented from being adhered to the polyurethane foam, and the polyurethane foam burrs at the edge are conveniently trimmed off during trimming.

Further, the width of the interference edge is 9.5-10.5 mm.

Further, during mold clamping, a gap for discharging gas generated during foaming is left between the upper mold and the lower mold. The polyurethane foam in the gap is the polyurethane foam flash.

Further, the dwell time is 75-85s, and the temperature of the die is 60-70 ℃ during dwell.

Further, the polyurethane foam has a density of 55-60kg/m³。

Furthermore, the PE waterproof film is made of LDPE and has a thickness of 0.03-0.05 mm.

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

(1) according to the invention, the pocket type PE waterproof membrane with small thickness is sleeved outside the polyurethane foam, so that the waterproof effect can be achieved, and the integral density of the product cannot be greatly improved;

(2) the material disclosed by the invention is low in density and cost, the car body is easy to lighten, and the whole material still has better NVH (noise vibration and harshness) performance.

Drawings

FIG. 1 is a schematic view of a lower die used in the present invention;

FIG. 2 is a schematic view of an upper die for use in the present invention;

FIG. 3 is a positional relationship between a PE waterproof film and a polyurethane foam in the present invention;

FIG. 4 is a graph showing the sound absorption performance of the foamed acoustic insulating mat of the example.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

Examples

A method for manufacturing a full waterproof battery pack foamed sound insulation pad, as shown in fig. 1-3, the method comprises the following steps:

(1) fixing a single PE waterproof film on an upper die of a die in an adsorption manner, placing a pocket type PE waterproof film at a corresponding position of a lower die of the die, and adsorbing the pocket type PE waterproof film on the lower die; wherein the PE waterproof membrane comprises a single piece of PE waterproof upper membrane and a pocket type PE waterproof membrane. If the PE waterproofing membrane is compared to a pocket, the single piece of PE waterproofing upper membrane is the top of the pocket, and the pocket type PE waterproofing membrane is the other part of the pocket except for the opening. An interference edge is reserved on the periphery of the pocket type PE waterproof membrane and is abutted against the side wall of the lower die. The interference edge is coated with a release agent. The PE waterproof film is prevented from being adhered to the polyurethane foam, and the polyurethane foam burrs at the edge are conveniently trimmed off during trimming. The width of the interference edge is 10 mm.

(2) Pouring a polyurethane foaming material into a lower die cavity, and immediately closing the upper die and the lower die to maintain pressure after about 15 seconds and when the polyurethane foaming material begins to foam; when the die is closed, a gap for exhausting gas generated during foaming is reserved between the upper die and the lower die. The polyurethane foam in the gap is the polyurethane foam flash. The dwell time was about 80 s.

(3) After pressure maintaining is finished, opening the mold, taking out the polyurethane foam with the PE waterproof film, peeling off polyurethane foam flash generated at the parting surface position of the upper mold and the lower mold after polyurethane foaming from the PE waterproof film, and trimming off the polyurethane foam flash by using a cutter; the density of the prepared polyurethane foam is 55-60kg/m³。

(4) And (3) performing plastic sealing on the positions, which are subjected to interference fit, of the PE waterproof film of the trimmed polyurethane foam coated with the PE waterproof film to obtain the fully waterproof storage battery pack foamed sound insulation pad. Wherein, the PE waterproof membrane is made of LDPE and has a thickness of 0.03-0.05 mm.

With the full waterproof battery package foaming sound insulation pad of this embodiment preparation directly paste in vehicle bottom panel beating department with the double faced adhesive tape to waterproof nature test and NVH capability test:

1. water resistance test-Water resistance test

Soaking at the water temperature (40 +/-1) DEG C for the following time: 48 h; the sample was taken out and left at room temperature for 1h,

calculating the formula: water absorption of (m)₂-m₁)÷m₁×100％

m₁: mass before test

m₂: mass after test

The experimental results are as follows: the water absorption rate is less than 10 percent, and is obviously improved compared with polyurethane foam which is not coated with a PE waterproof film.

2. NVH performance test

As shown in fig. 4, because the polyurethane foam is in an open-cell structure, noise generated in the driving process of the vehicle can be effectively absorbed, so that the NVH performance of the whole vehicle reaches a high level.

The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.