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Engine cover cap and preparation method therefore
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A technology of engine hood and polyol, which is applied in superstructure sub-assembly, transportation and packaging, superstructure, etc. It can solve problems such as poor sound absorption effect, trachoma or dark bubbles, and poor product yield
Inactive Publication Date: 2017-11-21
上海飞利环球汽车零部件有限公司
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Problems solved by technology
Although the soft engine cover made of polyurethane integral skin foam has a certain impactcushioning effect after colliding with pedestrians, however, during the pouring process, the soft engine cover is prone to trachoma or dark bubbles due to the need for lightweight Defects make the product yield poor and affect the appearance of the user; in addition, the back of the engine cover will produce a correspondingly thinner skin, resulting in poor sound-absorbing effect
Method used
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preparation example Construction
[0158]
[0159] A kind of preparation method of engine cover, it comprises: following steps:
[0160] (1), spraying a skin layer forming agent on the inner surface of the lower mold to form a skin layer;
[0161] (2), pour foam layer generator on the surface of cortex and close upper mold and lower mold to form foam layer;
[0162] (3), open upper mold and lower mold, obtain engine cover.
[0164] The raw materials for the production of the above-mentioned skin-forming agent include the following components and the parts by weight of each component are as follows:
[0165]
[0166]
[0167] Wherein, the first polyether polyol component includes: 60-80wt% polyol A, 10-20wt% polyol B and 10-20wt% polyol C. Polyol A is polyoxyethylene oxypropylene polyol, the content of ethyleneoxide can be 10-20wt%, the functionality can be 3, and the hydroxyl value can be 33-37mgKOH / g. Polyol B is polyethyleneoxidepropylene oxide polyol grafted with styren...
Embodiment 1
[0199] This embodiment provides an engine cover, which includes a foam layer and a skin layer.
[0200] [cortex]
[0201] The cortex comprises the following components, and the parts by weight of each component are as follows:
[0202]
[0203] (first polyether polyol component)
[0204] The first polyether polyol component comprises: 70 wt% polyol A, 15 wt% polyol B and 15 wt% polyol C.
[0205] Polyol A is polyoxyethylene oxypropylene polyol with an oxyethylene content of 10-20wt%, a functionality of 3, a hydroxyl value of 33-37 mgKOH / g, and a grade of GEP330N.
[0206] Polyol B is polyoxyethylene oxide propylene polyol grafted with styrene-acrylonitrile, the content of styrene-acrylonitrile (graft) can be 40-45wt%, the functionality is 3, and the hydroxyl value is 19-23mgKOH / g, the grade is GPOP H45.
[0207] Polyol C is polyoxypropylene polyol, the functionality can be 2, the hydroxyl value is 54.5-57.5mgKOH / g, and the grade is GE-220.
[0259] This embodiment provides an engine cover, which includes a foam layer and a skin layer.
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Abstract
The invention provides an engine cover cap and a preparation method therefore. The engine cover cap comprises a foam layer which is used for at least partially covering an engine surface of a vehicle and a skin layer which is used for at least partially covering the foam layer; and the preparation method comprises the following steps: spraying a skin layer generating agent to the inner surface of a lower mould for forming the skin layer, pouring a foam layer generating agent to the inner surface of the skin layer and closing an upper mould and the lower mould to form the foam layer, and opening the upper mould and the lower mould to obtain the engine cover cap. According to the preparation method for the engine cover cap provided in the invention, the skin layer is formed at the inner surface of the lower mould through a high-pressure spraying method, because the high-pressure spraying method can realize layer-by-layer spraying, and can realize full covering of the inner surface of the lower mould, the integrating degree between the skin layer and the inner surface of the lower mould is extremely good, defects of sand holes, dark bubbles and the like which appear at the outer surface of an engine cover cap in the prior art are effectively avoided, the exposed surface of the skin layer obtains a good appearance, visual requirements of users can be met, and sound absorption effects can also be provided.
Description
technical field [0001] The invention belongs to the technical field of engine cover materials, and relates to an engine cover and a preparation method thereof. Background technique [0002] The engine cover is an auto accessory that covers the engine of the vehicle. Its surface in contact with the engine needs to have good sound absorption, so as to prevent the noise generated by the engine from spreading to the cockpit; its surface that is not in contact with the engine needs to have good sound absorption. In order to meet the user's appearance feeling. [0003] The current manufacturing process of the engine cover is divided into two types, one is to use a hard PP or PA injection-molded hard shell, and the back is covered with sound-absorbing materials to obtain a hard engine cover; the other is a soft engine cover, which is made of Made of one-time cast polyurethane integral skin foam. Although the soft engine cover made of polyurethane integral skin foam has a certain ...
Claims
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Application Information
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