CN111300716A - Manufacturing method of fireproof PUR decorative cover of automobile engine - Google Patents
Manufacturing method of fireproof PUR decorative cover of automobile engine Download PDFInfo
- Publication number
- CN111300716A CN111300716A CN201911206827.7A CN201911206827A CN111300716A CN 111300716 A CN111300716 A CN 111300716A CN 201911206827 A CN201911206827 A CN 201911206827A CN 111300716 A CN111300716 A CN 111300716A
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- Prior art keywords
- polyether
- mold
- pur
- fireproof
- decorative cover
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
- B29C44/06—Making multilayered articles
- B29C44/065—Making multilayered articles comprising at least one barrier layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/60—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2071/00—Use of polyethers, e.g. PEEK, i.e. polyether-etherketone or PEK, i.e. polyetherketone or derivatives thereof, as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/748—Machines or parts thereof not otherwise provided for
- B29L2031/749—Motors
Landscapes
- Polyurethanes Or Polyureas (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to a method for manufacturing a fireproof PUR decorative cover of an automobile engine, which adopts a three-component high-pressure foaming machine to manufacture, polyether, isocyanate and polyether mixture which are not added with a flame retardant are respectively added into three storage tanks, then the three storage tanks are proportionally injected into a die consisting of an upper die and a lower die to carry out foaming, curing, forming and cooling, redundant flash is removed, the structure of a part blank is detected by utilizing automatic image recognition, and the detected part blank is the fireproof PUR decorative cover of the engine. Compared with the prior art, the flame-retardant rubber composition can meet the appearance requirement, does not generate noise, can achieve the flame-retardant effect and has the flame-retardant performance of V0 level.
Description
Technical Field
The invention relates to the field of automobile part manufacturing, in particular to a manufacturing method of a fireproof PUR decorative cover of an automobile engine.
Background
NVH (noise, vibration and harshness) is a comprehensive measure of the quality of a manufactured vehicle, which gives the vehicle user the most immediate and superficial experience. The NVH problem of vehicles is one of the concerns of various large vehicle manufacturing enterprises and component enterprises in the international automotive industry. The engine compartment noise is one of main noise sources of automobile noise, and is essential for reducing the noise of the engine compartment if the noise of the whole automobile is reduced, however, the engine decorative cover in the automobile industry is generally made of nylon materials, is hard in texture, has no acoustic performance, and is easy to resonate with other parts to generate secondary noise pollution; therefore, a material which can meet the appearance requirement, does not produce noise and can achieve the noise reduction effect is needed. The original purpose of product application is noise reduction, but because the using position of the product is an engine compartment, the safety performance also becomes a very important box requirement, so a material which can meet both the acoustic requirement and the safety performance requirement is required;
chinese patent CN108203492A discloses a PUR decorative cover for automobile engine and a method for making the same, the decorative cover is matched with the shape of the engine and used for wrapping engine parts, the decorative cover is of a multi-component polyurethane foam structure and comprises an outer surface layer, an inner surface layer and a middle layer positioned between the outer surface layer and the inner surface layer, the outer surface layer is a hard crust, the inner surface layer is an internal compact layer, and the middle layer is an open-pore soft foam material layer. However, the product shown in this patent does not have flame retardant properties.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a method for manufacturing a fireproof PUR decorative cover of an automobile engine, and solves the technical problem that the PUR decorative cover in the prior art cannot realize flame retardance.
The purpose of the invention can be realized by the following technical scheme:
a manufacturing method of a fireproof PUR decorative cover of an automobile engine adopts a three-component high-pressure foaming machine for manufacturing, and comprises the following steps:
heating the lower die to 50-60 ℃ and preserving heat;
heating the upper die to 50-60 ℃ and preserving heat;
adding expanded graphite, a flame retardant and an antioxidant into polyether, mixing to obtain a polyether mixture, and then adding the polyether mixture into a first storage tank of a high-pressure foaming machine;
adding polyether without the flame retardant into a second storage tank of the high-pressure foaming machine;
adding isocyanate into a third storage tank of a high-pressure foaming machine;
spraying a solvent type release agent on the upper die;
spraying a water-based release agent on the lower die;
spraying inner mold paint on the lower mold;
proportionally injecting the foaming raw materials in the storage tank into a mold formed by an upper mold and a lower mold;
closing the mold, so that the foaming raw material is foamed, cured and molded in the mold;
opening the die to obtain a part blank;
placing the part blank into a cooling and shaping tool, and naturally cooling for more than 120 seconds;
removing redundant flash of the part blank;
detecting the structure of the part blank by utilizing automatic image recognition;
and the part blank passing the detection is the fireproof PUR decorative cover of the engine.
The mass ratio of the polyether to the expanded graphite to the flame retardant to the antioxidant is 50: 30: 10: 10.
the polyether without the added flame retardant also contains 3 wt% of water-based foaming agent and 5 wt% of physical foaming agent.
The mass ratio of the polyether, the isocyanate and the polyether mixture without the flame retardant is 70:70: 30.
The water-based release agent takes water as a solvent, and the effective component is a silicone substance.
The solvent-type release agent takes methylene dichloride as a solvent, and the effective component is paraffin.
And controlling the pressure in the mold to be 0.5-0.8 MPa after the mold is closed.
The cooling shaping tool is provided with a supporting part which is attached to the bottom surface of the part blank, and heat dissipation through holes are distributed on the supporting part.
The automatic image recognition is characterized in that an industrial camera is adopted to take pictures, sample and file all positions of qualified parts, a pixel deviation range is set, a pixel comparison method is adopted under the same light source to detect the part blank, if a detection result exceeds the set pixel deviation range, the part blank is unqualified, and if the detection result is in the deviation range, the part passes the detection.
The fireproof PUR decorative cover for the automobile engine, which is manufactured by the method, has the perfect appearance of the plastic decorative cover, and the flame retardant grade of the product meets the UL94V-0 requirement, which belongs to the highest-grade flame retardant requirement in polyurethane foam products.
In addition, the product also has good noise reduction performance, because the non-visible surface of the product can be designed according to the structure of the engine, the engine is wrapped well, and the noise of the engine is reduced through the wrapping structure. The product appearance surface has good skinning to can make different surface textures through different moulds, in order to satisfy different customers' demands.
The inner surface of the product is of an open pore structure, and noise can be absorbed through the continuous open pores, so that sound absorption and noise reduction are further performed in addition to structural noise reduction.
The product is originally developed for noise reduction, but is in the application position of the product, the safety performance is also the most important performance of the product, a large amount of antioxidant and flame retardant are added in the product formula, the safety performance and the high temperature resistance of the product are improved, the product can bear the high temperature of 150 ℃, the storage time is 672h, and the product has no aging sign after being stored;
because a large amount of additives are added to the product, the production difficulty of the product is greatly increased, and the viscosity of the raw materials is greatly improved by the additives, the special three-component high-pressure machine is needed for producing the product instead of a common high-pressure foaming machine.
Compared with the prior art, the technical scheme disclosed by the invention has the following beneficial effects:
(1) the flame retardant grade of the product meets the requirement of UL94V-0, and the product has very high fireproof performance;
(2) the common high-temperature-resistant fireproof sound-absorbing damping part for the engine compartment of the automobile can resist the high temperature of 150 ℃ at most, and the decorative cover manufactured by the method can be stored for 672h at the high temperature of 150 ℃, is free from spontaneous combustion and deformation, and does not have any aging phenomenon.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1
A manufacturing method of a fireproof PUR decorative cover of an automobile engine adopts a three-component high-pressure foaming machine for manufacturing, and comprises the following steps:
(1) heating the lower die to 50 ℃ and preserving heat;
(2) raising the temperature of the upper die to 50 ℃ and preserving the temperature;
(3) adding expanded graphite, a flame retardant and an antioxidant into polyether, wherein the mass ratio of the polyether to the expanded graphite to the flame retardant to the antioxidant is 50: 30: 10: 10, mixing to obtain a polyether mixture, and adding the polyether mixture into a first storage tank of a high-pressure foaming machine;
(4) adding polyether without added flame retardant into a second storage tank of a high-pressure foaming machine, wherein 3 wt% of water-based foaming agent and 5 wt% of physical foaming agent are also added into the polyether;
(5) adding isocyanate into a third storage tank of a high-pressure foaming machine;
(6) spraying a solvent type release agent on the upper die, wherein the solvent type release agent used in the embodiment takes dichloromethane as a solvent, and the active ingredient is paraffin;
(7) spraying a water-based release agent on the lower die, wherein the water-based release agent used in the embodiment takes water as a solvent, and the effective component is a silicone substance;
(8) spraying inner mold paint on the lower mold;
(9) injecting polyether, isocyanate and polyether mixture without adding a flame retardant into a mold consisting of an upper mold and a lower mold according to the mass ratio of 70:70: 30;
(10) closing the mold, controlling the pressure in the mold to be 0.5MPa, and foaming, curing and molding the foaming raw material in the mold;
(11) opening the die to obtain a part blank;
(12) placing the part blank into a cooling and shaping tool, and naturally cooling for more than 120 seconds, wherein the used cooling and shaping tool is provided with a supporting part which is attached to the bottom surface of the part blank, and heat dissipation through holes are distributed on the supporting part;
(13) removing redundant flash of the part blank;
(14) detecting the structure of a part blank by utilizing automatic image recognition, taking pictures, sampling and archiving at each position of a qualified part by adopting an industrial camera, setting a pixel deviation range, detecting the part blank by adopting a pixel comparison method under the same light source, wherein if a detection result exceeds the set pixel deviation range, the part blank is unqualified, and if the detection result is in the deviation range, the part passes the detection;
(15) and the part blank passing the detection is the fireproof PUR decorative cover of the engine.
Example 2
A manufacturing method of a fireproof PUR decorative cover of an automobile engine adopts a three-component high-pressure foaming machine for manufacturing, and comprises the following steps:
(1) heating the lower die to 55 ℃ and preserving heat;
(2) raising the temperature of the upper die to 55 ℃ and preserving the heat;
(3) adding expanded graphite, a flame retardant and an antioxidant into polyether, wherein the mass ratio of the polyether to the expanded graphite to the flame retardant to the antioxidant is 50: 30: 10: 10, mixing to obtain a polyether mixture, and adding the polyether mixture into a first storage tank of a high-pressure foaming machine;
(4) adding polyether without added flame retardant into a second storage tank of a high-pressure foaming machine, wherein 3 wt% of water-based foaming agent and 5 wt% of physical foaming agent are also added into the polyether;
(5) adding isocyanate into a third storage tank of a high-pressure foaming machine;
(6) spraying a solvent type release agent on the upper die, wherein the solvent type release agent used in the embodiment takes dichloromethane as a solvent, and the active ingredient is paraffin;
(7) spraying a water-based release agent on the lower die, wherein the water-based release agent used in the embodiment takes water as a solvent, and the effective component is a silicone substance;
(8) spraying inner mold paint on the lower mold;
(9) injecting polyether, isocyanate and polyether mixture without adding a flame retardant into a mold consisting of an upper mold and a lower mold according to the mass ratio of 70:70: 30;
(10) closing the mold, controlling the pressure in the mold to be 0.7MPa, and foaming, curing and molding the foaming raw material in the mold;
(11) opening the die to obtain a part blank;
(12) placing the part blank into a cooling and shaping tool, and naturally cooling for more than 120 seconds, wherein the used cooling and shaping tool is provided with a supporting part which is attached to the bottom surface of the part blank, and heat dissipation through holes are distributed on the supporting part;
(13) removing redundant flash of the part blank;
(14) detecting the structure of a part blank by utilizing automatic image recognition, taking pictures, sampling and archiving at each position of a qualified part by adopting an industrial camera, setting a pixel deviation range, detecting the part blank by adopting a pixel comparison method under the same light source, wherein if a detection result exceeds the set pixel deviation range, the part blank is unqualified, and if the detection result is in the deviation range, the part passes the detection;
(15) and the part blank passing the detection is the fireproof PUR decorative cover of the engine.
Example 3
A manufacturing method of a fireproof PUR decorative cover of an automobile engine adopts a three-component high-pressure foaming machine for manufacturing, and comprises the following steps:
(1) heating the lower die to 60 ℃ and preserving heat;
(2) raising the temperature of the upper die to 60 ℃ and preserving the temperature;
(3) adding expanded graphite, a flame retardant and an antioxidant into polyether, wherein the mass ratio of the polyether to the expanded graphite to the flame retardant to the antioxidant is 50: 30: 10: 10, mixing to obtain a polyether mixture, and adding the polyether mixture into a first storage tank of a high-pressure foaming machine;
(4) adding polyether without added flame retardant into a second storage tank of a high-pressure foaming machine, wherein 3 wt% of water-based foaming agent and 5 wt% of physical foaming agent are also added into the polyether;
(5) adding isocyanate into a third storage tank of a high-pressure foaming machine;
(6) spraying a solvent type release agent on the upper die, wherein the solvent type release agent used in the embodiment takes dichloromethane as a solvent, and the active ingredient is paraffin;
(7) spraying a water-based release agent on the lower die, wherein the water-based release agent used in the embodiment takes water as a solvent, and the effective component is a silicone substance;
(8) spraying inner mold paint on the lower mold;
(9) injecting polyether, isocyanate and polyether mixture without adding a flame retardant into a mold consisting of an upper mold and a lower mold according to the mass ratio of 70:70: 30;
(10) closing the mold, controlling the pressure in the mold to be 0.8MPa, and foaming, curing and molding the foaming raw material in the mold;
(11) opening the die to obtain a part blank;
(12) placing the part blank into a cooling and shaping tool, and naturally cooling for more than 120 seconds, wherein the used cooling and shaping tool is provided with a supporting part which is attached to the bottom surface of the part blank, and heat dissipation through holes are distributed on the supporting part;
(13) removing redundant flash of the part blank;
(14) detecting the structure of a part blank by utilizing automatic image recognition, taking pictures, sampling and archiving at each position of a qualified part by adopting an industrial camera, setting a pixel deviation range, detecting the part blank by adopting a pixel comparison method under the same light source, wherein if a detection result exceeds the set pixel deviation range, the part blank is unqualified, and if the detection result is in the deviation range, the part passes the detection;
(15) and the part blank passing the detection is the fireproof PUR decorative cover of the engine.
The fireproof PUR decorative cover for the automobile engine, which is manufactured by the method, has the perfect appearance of the plastic decorative cover, and the flame retardant grade of the product meets the UL94V-0 requirement, which belongs to the highest-grade flame retardant requirement in polyurethane foam products. The manufactured decorative cover can be stored for 672h at the high temperature of 150 ℃, is free from spontaneous combustion and deformation, and has no aging phenomenon.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. A manufacturing method of a fireproof PUR decorative cover of an automobile engine is characterized by comprising the following steps:
heating the lower die to 50-60 ℃ and preserving heat;
heating the upper die to 50-60 ℃ and preserving heat;
adding expanded graphite, a flame retardant and an antioxidant into polyether, mixing to obtain a polyether mixture, and then adding the polyether mixture into a first storage tank of a high-pressure foaming machine;
adding polyether without the flame retardant into a second storage tank of the high-pressure foaming machine;
adding isocyanate into a third storage tank of a high-pressure foaming machine;
spraying a solvent type release agent on the upper die;
spraying a water-based release agent on the lower die;
spraying inner mold paint on the lower mold;
proportionally injecting the foaming raw materials in the storage tank into a mold formed by an upper mold and a lower mold;
closing the mold, so that the foaming raw material is foamed, cured and molded in the mold;
opening the die to obtain a part blank;
placing the part blank into a cooling and shaping tool, and naturally cooling for more than 120 seconds;
removing redundant flash of the part blank;
detecting the structure of the part blank by utilizing automatic image recognition;
and the part blank passing the detection is the fireproof PUR decorative cover of the engine.
2. The method for manufacturing the fireproof PUR decorative cover of the automobile engine according to claim 1, wherein the mass ratio of the polyether to the expanded graphite to the flame retardant to the antioxidant is 50: 30: 10: 10.
3. the method of claim 1, wherein the polyether without the flame retardant further comprises 3 wt% of an aqueous foaming agent and 5 wt% of a physical foaming agent.
4. The method of claim 1, wherein the polyether, isocyanate and polyether mixture without the flame retardant are mixed at a weight ratio of 70:70: 30.
5. The method of claim 1, wherein the method comprises a three-component high-pressure foaming machine.
6. The method of claim 1, wherein the aqueous release agent is water as a solvent and the effective component is a silicone-based material.
7. The method of claim 1, wherein the solvent-based release agent is methylene chloride and the active ingredient is paraffin.
8. The method for manufacturing the fireproof PUR decorative cover of the automobile engine according to claim 1, wherein the pressure in the mold is controlled to be 0.5-0.8 MPa after the mold is closed.
9. The method for manufacturing the fireproof PUR decorative cover of the automobile engine according to claim 1, wherein the cooling and shaping tool is provided with a supporting part attached to the bottom surface of the part blank, and heat dissipation through holes are distributed on the supporting part.
10. The method of claim 1, wherein the automated image recognition is performed by taking a picture of a qualified part with an industrial camera, sampling and archiving the part at each position, setting a pixel deviation range, detecting the part blank with a pixel comparison method under the same light source, and if the detection result exceeds the set pixel deviation range, the part blank is rejected, and if the detection result is within the deviation range, the part passes the detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911206827.7A CN111300716A (en) | 2019-11-29 | 2019-11-29 | Manufacturing method of fireproof PUR decorative cover of automobile engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911206827.7A CN111300716A (en) | 2019-11-29 | 2019-11-29 | Manufacturing method of fireproof PUR decorative cover of automobile engine |
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| CN111300716A true CN111300716A (en) | 2020-06-19 |
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| CN201911206827.7A Pending CN111300716A (en) | 2019-11-29 | 2019-11-29 | Manufacturing method of fireproof PUR decorative cover of automobile engine |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19818322A1 (en) * | 1997-04-23 | 1998-11-19 | Ind Tech Res Inst | Production of continuous fibre-reinforced thermoplastic composites |
| CN101570987A (en) * | 2009-05-27 | 2009-11-04 | 董升顺 | Polyurethane composite insulation board and preparation method thereof |
| CN103897131A (en) * | 2012-12-30 | 2014-07-02 | 上海新安汽车隔音毡有限公司 | Manufacturing method of high-temperature-resistant fire-resistant sound-absorption shock-absorption parts for automobile engine compartment |
| CN104119489A (en) * | 2013-12-23 | 2014-10-29 | 上海新安汽车隔音毡有限公司 | Manufacturing method of shock-absorbing sound-proof housing for automobile high-pressure fuel pump |
| CN108203492A (en) * | 2016-12-19 | 2018-06-26 | 上海新安汽车隔音毡有限公司 | A kind of automobile engine PUR Decorative Covers and preparation method thereof |
-
2019
- 2019-11-29 CN CN201911206827.7A patent/CN111300716A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19818322A1 (en) * | 1997-04-23 | 1998-11-19 | Ind Tech Res Inst | Production of continuous fibre-reinforced thermoplastic composites |
| CN101570987A (en) * | 2009-05-27 | 2009-11-04 | 董升顺 | Polyurethane composite insulation board and preparation method thereof |
| CN103897131A (en) * | 2012-12-30 | 2014-07-02 | 上海新安汽车隔音毡有限公司 | Manufacturing method of high-temperature-resistant fire-resistant sound-absorption shock-absorption parts for automobile engine compartment |
| CN104119489A (en) * | 2013-12-23 | 2014-10-29 | 上海新安汽车隔音毡有限公司 | Manufacturing method of shock-absorbing sound-proof housing for automobile high-pressure fuel pump |
| CN108203492A (en) * | 2016-12-19 | 2018-06-26 | 上海新安汽车隔音毡有限公司 | A kind of automobile engine PUR Decorative Covers and preparation method thereof |
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Application publication date: 20200619 |
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