Self-deodorizing TPO (thermoplastic polyolefin) material for vehicles and preparation method of TPO material

Abstract

The invention discloses a self-deodorizing TPO (thermoplastic polyolefin) material for vehicles and a preparation method of the TPO material, relates to the technical field of layered interior materials for vehicles, and aims to solve the problem of odor of the TPO material for vehicles. The TPO composite material comprises a surface treatment layer, a TPO compact layer and a foam layer, wherein the surface treatment layer and the foam layer are respectively positioned on two surfaces of the TPO compact layer; the TPO compact layer consists of POE (Polyolefin Elastomer), LDPE (Low-Density Polyethylene), PP (Propene Polymer), a light stabilizer, a pigment and a self-odor-eliminating agent, the self-odor-eliminating agent comprises an organic compound containing amino, hydroxyl or carboxyl functional groups, and micromolecular odor substances containing N, S and C elements generated in a component material of the TPO compact layer or in a processing process are eliminated or partially eliminated by utilizing a chemical reaction between the self-odor-eliminating agent and components of the TPO compact layer. The material smell is reduced; the preparation process is simple, and the effect of reducing odor is achieved by adding the self-odor eliminating agent into the TPO compact layer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of layered automotive interior materials, in particular to a self-odor-reducing automotive TPO material and a preparation method thereof. BACKGROUND

[0002] The TPO (thermoplastic polyolefin) material widely used in the market is mainly composed of polyolefin elastomer, and various additives are added during production. These materials can meet certain physical performance requirements through high-temperature melt extrusion or calendering molding process, but due to the high temperature, some small molecules containing N, S, C elements will inevitably be produced in the process due to the decomposition of impurities or the material itself. The release of these small molecules leads to a more obvious odor in the car environment. With the development of society and the continuous improvement of people's living standards, people's requirements for the comfort and health of the car interior environment are getting higher and higher, and the odor problem caused by the volatile substances in the car is becoming more and more sensitive. Therefore, the odor problem in the car has become the focus of attention of automobile manufacturers and consumers. In order to cope with this challenge, automobile manufacturers have become extremely strict in controlling the odor in the car, and the odor problem of interior materials has gradually become a hot topic of public concern.

[0003] At present, the industry mainly adopts methods such as baking treatment, adding odorants, or using physical adsorbents to reduce the odor caused by the material itself in order to solve the odor problem of automotive interior materials. For example, the invention patent with the announcement number CN102514337B and the name of an automotive interior material and its manufacturing method discloses a technical solution of adding silica as an adsorbent in the TPO surface layer; however, these methods are not a direct way to solve the odor problem, and still have certain limitations, such as adsorption saturation, material dispersion, etc.

[0004] The odor problem of the material has become a difficult problem faced by material manufacturers and automobile manufacturers, and is also a hot issue of consumer complaints, which hinders the development of the automotive industry in a better, more comfortable, and higher direction to a great extent. Therefore, how to improve the solution to the odor problem of automotive TPO materials or develop new methods has become one of the industry's key targets, and the TPO surface layer, in addition to the surface treatment layer and the foaming layer, needs to add performance improving components, so the demand for odor problem solving solutions is more urgent. SUMMARY

[0005] The purpose of the present application is to provide a self-odor-reducing automotive TPO material and a preparation method thereof, to solve the problem that the odor elimination method of automotive TPO materials needs to be further developed.

[0006] To achieve the above object, the present application provides the following technical scheme: a self-odor-eliminating TPO material for vehicles, comprising a surface treatment layer, a TPO dense layer and a foam layer, the surface treatment layer and the foam layer being respectively located on two sides of the TPO dense layer; the TPO dense layer is composed of POE, LDPE, PP, light stabilizer, pigment and self-odor-eliminating agent, wherein the self-odor-eliminating agent comprises an organic compound containing amino, hydroxyl or carboxyl functional groups, and the self-odor-eliminating agent is used to eliminate or partially eliminate odor substances containing N, S and C elements generated in the material itself or in the processing process of the components of the TPO dense layer, so as to reduce the odor of the material. The components of the TPO dense layer comprise, by weight fraction, POE 30-80 parts, LDPE 10-30 parts, PP 5-20 parts, light stabilizer 0.1-1 part, self-odor-eliminating agent 1-7 parts and pigment 2-6 parts. In a preferred scheme, the self-odor-eliminating agent is a mixture composed of functional components and a carrier, and the carrier is PP or PE, and the carrier accounts for 20-50% by mass percentage.

[0007] In the above preferred scheme, more preferably, the functional component powder has a bulk density of 0.3-0.6 g / cm 3 , and the self-odor-eliminating agent is prepared by mixing the functional components and the carrier in an extruder at 130-160 ℃ and then granulating.

[0008] In the above preferred scheme, optionally, the functional component is selected from diethylene triamine or alanine.

[0009] In an optional scheme, the components of the surface treatment layer comprise, by weight fraction, bright surface resin 40-90 parts, semi-bright resin 10-60 parts, hand feel aid 0-10 parts, crosslinking agent 2-8 parts and water 0-50 parts.

[0010] In the above optional scheme, further optionally, the two resins in the surface treatment layer components are both water-based polycarbonate type polyurethane dispersions, and the solid content is 30-40%; the hand feel aid is an organic silicon material; and the crosslinking agent is one or more of modified polycarbodiimide crosslinking agent C-7070, aziridine crosslinking agent SaC-100 and oxazoline type crosslinking agent WS-500.

[0011] In an optional scheme, the foam layer is a polyolefin foam body, the thickness is 1.0-4.0 mm, the foaming ratio is 10-25 times, and the density is 40-100 kg / m 3 .

[0012] In an optional scheme, the TPO material further comprises a back coating layer coated on the side of the foam layer away from the TPO dense layer according to the process requirement.

[0013] The application provides another technical scheme: a preparation method of a self-odor-eliminating TPO material for vehicles, which comprises the following steps: adding components of a TPO dense layer into a feeding system of a double-screw extruder, heating the extrusion equipment to 150-200 DEG C, melting and mixing all raw materials in the double-screw cylinder, and extruding the TPO dense layer through a die; simultaneously extruding the film and transporting a foam layer to the place where the TPO dense layer is formed through a feeding system, and hot-pressing and compounding the TPO dense layer and the foam layer to obtain a semi-finished product; weighing each raw material of a surface treatment layer, fully mixing and stirring the raw materials, and coating the surface treatment layer on the surface of the TPO dense layer of the semi-finished product through printing.

[0014] Preferably, the semi-finished product is subjected to corona treatment to reduce the surface tension before the surface treatment layer is coated.

[0015] Compared with the prior art, the application has the following beneficial effects: The self-odor-eliminating TPO material for vehicles and the preparation method thereof have the advantages that the preparation process is simple, no new process step is added, the self-odor-eliminating agent is added into the TPO dense layer, the amino group, the hydroxyl group or the carboxyl group functional group contained in the self-odor-eliminating agent can react with the components of the TPO dense layer to neutralize, graft, oxidize or acidize, thereby eliminating or partially eliminating odor substances containing N, S and C elements generated in the TPO dense layer or in the material itself or in the processing process, so that the odor of the TPO dense layer is reduced, and a new road for the development of the TPO material for vehicles is opened up. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The figure is a schematic view of the positional relationship of each layer in an embodiment of the application.

[0017] In the figure, 1 is a surface treatment layer, 2 is a TPO dense layer, 3 is a foam layer, and 4 is a back coating layer. DETAILED DESCRIPTION

[0018] A self-odor-eliminating TPO material for vehicles comprises a surface treatment layer, a TPO dense layer and a foam layer, the surface treatment layer and the foam layer are respectively located on two sides of the TPO dense layer; the TPO dense layer is composed of POE (a thermoplastic elastomer ethylene-octene copolymer), LDPE, PP, a light stabilizer, a pigment and a self-odor-eliminating agent; the self-odor-eliminating agent comprises an organic compound containing an amino group, a hydroxyl group or a carboxyl group functional group; the self-odor-eliminating agent is used to eliminate or partially eliminate odor substances containing N, S and C elements generated in the TPO dense layer or in the material itself or in the processing process through chemical reactions between the self-odor-eliminating agent and the components of the TPO dense layer, so as to reduce the odor of the material; the reaction principle can include neutralization, grafting, oxidation, acidification and the like; for example:

[0019]

[0020] The components of the TPO dense layer include, by weight fraction, POE 30-80 parts, LDPE 10-30 parts, PP 5-20 parts, light stabilizer 0.1-1 part (preferably a hindered amine light stabilizer such as poly(2,2,6,6-tetramethyl-4-piperidinyl acrylate), Tinuvin 770, BASF UV-360, etc.), self-odor-reducing agent 1-7 parts, pigment 2-6 parts. In a preferred embodiment, the self-odor-reducing agent is a mixture of a functional component and a carrier, the carrier being PP or PE, and the carrier accounting for 20-50% by mass fraction; for further reference, the functional component can have a powder bulk density of 0.3-0.6 g / cm 3 The self-odor-reducing agent can be prepared by mixing the functional component and the carrier in an extruder at 130-160°C and then granulating, the functional component can be selected from diethylene triamine or alanine, etc., and in general any organic compound containing an amino, hydroxyl, or carboxyl functional group, and of course further selection conditions such as easy availability, non-toxicity, and low cost can be added according to common sense, but these selection considerations are not the focus of the present application.

[0021] In addition, the odor reduction in the present application is focused on the TPO dense layer, and thus the other layers are mainly not to seriously affect the odor, and as an implementation reference, the components of the surface treatment layer include, by weight fraction, bright surface resin 40-90 parts, semi-bright resin 10-60 parts, hand feel aid 0-10 parts, crosslinking agent 2-8 parts, and water 0-50 parts, and further preferably, the two resins are both water-based polycarbonate type polyurethane dispersions with a solid content of 30-40%; the hand feel aid is an organic silicon material such as a silane coupling agent, polydimethylsiloxane, TAKETAI TTK-SG0150, SHIN-ETSU Y-MEISTER 86, etc.; and the crosslinking agent is one or several of modified polycarbodiimide crosslinking agent C-7070, aziridine crosslinking agent SaC-100, and oxazoline type crosslinking agent WS-500.

[0022] Similarly, the aforementioned foam layer can be a polyolefin foam, and the thickness is preferably controlled to be 1.0-4.0 mm, the foaming ratio can be 10-25 times, and the density can be selected to be 40-100 kg / m 3 .

[0023] In addition, according to the process requirements, the aforementioned TPO material can further include a back coating layer such as a water-based polyurethane resin coated on the side of the foam layer away from the TPO dense layer.

[0024] For reference, the preparation method of the aforementioned TPO material includes the following steps: The components of the TPO dense layer are added into the feeding system of the double screw extruder, the extruder temperature is heated to 150-200℃, all the raw materials are plasticized, melted and mixed in the double screw cylinder, and then extruded into the TPO dense layer through the die; The foam layer is transported to the place where the TPO dense layer is formed by the feeding system at the same time of extruding the film, and is hot-pressed and compounded with the TPO dense layer to form a semi-finished product; in order to reduce the surface tension of the semi-finished product, the surface treatment layer can be coated after the conventional corona treatment, for reference, the on-line surface corona plasma treatment can be used, and the power can be selected as 1.4-3.5kw; The raw materials of the surface treatment layer are weighed, fully stirred and mixed uniformly, and then coated on the surface of the TPO dense layer of the semi-finished product by printing.

[0025] The technical solutions and effects of the present application are further illustrated by several embodiments below, and it should be noted that the following are not all embodiments of the present application, but only control variables to prove the deodorizing effect, which are representative but should not be understood as absolute limitation of the present application.

[0026] The raw materials used in the following examples are as follows: POE selects Dow Engage 8100, the density is about 0.863g / cm 3 , and the hardness is about 75A; LDPE selects Maoming Petrochemical 868-000, the melt index is 1.7-2.2; PP selects LyondellBasell EP332K, the flow rate is 5g / 10min, the density is 0.90g / cm 3 , the yield tensile strength is 25MPa, and the yield tensile elongation is 9%; The light stabilizer selects BASF UV-360; The pigment selects Cabot PE6285 black polyethylene masterbatch.

[0027] The bright surface resin and the semi-bright resin select Siton SEACOAT PU2068 / SEACOAT PU1055; The hand feel aid selects Shin-Etsu Y-MEISTER86; The crosslinking agent selects modified polycarbodiimide crosslinking agent C-7070.

[0028] The foam layer selects TORAY PFTM20025 AP17, the thickness is 2.5mm, the foaming ratio is 20 times, and the density is 50kg / m 3 ; the compression hardness is 72kpa, and no back coating layer is used in the examples.

[0029] Example 1: In this embodiment, the functional component of the self-odor eliminating agent is diethylenetriamine, and the powder bulk density is 0.5 g / cm 3 The carrier is PP, and the carrier accounts for 50% by mass percentage. The functional component and the carrier are mixed at 150 DEG C in the extruder, and then granulated to prepare the self-odor eliminating agent. The components of the TPO dense layer include POE 60 parts, LDPE 30 parts, PP 5 parts, light stabilizer 1 part, self-odor eliminating agent 7 parts, and pigment 4 parts. The components are added into the feeding system of the double-screw extruder, the temperature of the extrusion equipment is heated to 190 DEG C, all the raw materials are plasticized, melted and mixed in the double-screw cylinder, and then extruded into a TPO dense film layer through a mold. The foam layer is transported to the film layer through the feeding system at the same time of film forming, and then hot-pressed and compounded with the TPO film layer to prepare a semi-finished product. The surface of the TPO dense layer is treated by on-line surface corona plasma with a power of 2 kw. The components of the surface treatment layer include bright surface resin 60 parts, semi-bright resin 40 parts, hand feel aid 3 parts, crosslinking agent 4 parts, and water 20 parts. The raw materials are fully stirred and mixed uniformly. The mixed slurry of the surface treatment layer is coated on the surface of the TPO dense layer of the semi-finished product by printing, and then dried at 120 DEG C for 2 min to complete the preparation.

[0030] Example 2 Another 7 groups of samples are prepared by the same method in Example 1, and only the weight fraction of the self-odor eliminating agent of the TPO dense layer is changed, which is 0, 1, 2, 3, 4, 5 and 6 parts, respectively.

[0031] The 8 samples in Examples 1 and 2 are evaluated by 10 experienced inspectors by using the method of Q / JLY J7110538 for the sample under direct sunlight. The results are shown in Table 1. Table 1 Evaluation results of the samples in Examples 1 and 2

[0032] Note: Level 5 represents a little unbearable, and the odor can be obviously perceived with moderate irritation. Level 6 represents tolerable, and the odor can be obviously perceived with slight irritation.

[0033] As shown in the above table, when the amount of the self-odor eliminating agent increases from 0 to 5 parts, the average level of the personnel evaluation is continuously improved, which indicates that the diethylenetriamine used in Examples 1 and 2 can indeed play a role in eliminating odor. When the amount of the self-odor eliminating agent is 5 to 7 parts, the personnel evaluation is maintained at level 6, which is a relatively high level in the current field, and the self-odor eliminating agent only acts on the TPO dense layer, and the interference of the surface treatment layer and the foam layer in the test is not eliminated.

[0034] Example 3 According to the method in Example 1, six TPO dense layers were prepared, and the weight fraction of the self-odor-reducing agent in the TPO dense layer was changed, specifically 4, 5, 6, 7, 8, and 9 parts, respectively.

[0035] The same test method in Example 2 was used, and the evaluation results are shown in Table 2 below: Table 2 Evaluation results of samples in Example 3

[0036] Note: Level 7 represents slight endurance, and the odor can be clearly perceived, but it is not irritating.

[0037] As can be seen from the above table, only the TPO dense layer is evaluated, and when the amount of self-odor-reducing agent is 4 to 7 parts, the average level of personnel evaluation is continuously improved with the increase of the amount of self-odor-reducing agent, but it is difficult to improve the evaluation level to a higher level by further increasing the amount of self-odor-reducing agent, which indicates that the effect of the self-odor-reducing agent is limited.

[0038] Example 4 In this example, the functional component of the self-odor-reducing agent is diethylene triamine, and the powder bulk density is 0.5 g / cm 3 The carrier is the same PP as in the TPO dense layer component, and the carrier accounts for 30% by mass percentage. The functional component and the carrier are mixed at 150°C in the extruder and then granulated to obtain the self-odor-reducing agent; The components of the TPO dense layer are POE 50 parts, LDPE 20 parts, PP 20 parts, light stabilizer 1 part, self-odor-reducing agent 5 parts, and pigment 5 parts by weight fraction. The components are added to the feeding system of the twin-screw extruder, and the extrusion equipment temperature is heated to 180°C. All the raw materials are plasticized, melted, and mixed in the twin-screw cylinder, and then extruded into a TPO dense film layer through a mold; At the same time of film formation, the foam layer is transported to the film layer place by the feeding system and hot-pressed with the TPO film layer to obtain a semi-finished product. The surface of the TPO dense layer is treated by on-line surface corona plasma with a power of 2kw. The components of the surface treatment layer are bright surface resin 70 parts, semi-bright resin 30 parts, hand feel aid 5 parts, crosslinking agent 5 parts, and water 10 parts by weight fraction. The raw materials are fully stirred and mixed uniformly. The surface treatment layer mixed slurry is coated on the surface of the TPO dense layer of the semi-finished product by printing, and then dried at 120°C for 2 min to complete the preparation.

[0039] Example 5 In this example, the functional component of the self-odor-reducing agent is alanine, and the powder bulk density is 0.5 g / cm 3, the carrier is 40% by mass percentage, the functional component and the carrier are mixed at 140℃ in the extruder, and the self-odor-reducing agent is prepared after granulation; The components of the TPO dense layer are POE 70 parts, LDPE 20 parts, PP 10 parts, light stabilizer 1 part, self-odor-reducing agent 6 parts, and pigment 3 parts by weight fraction, the components are added to the feeding system of the double-screw extruder, the extrusion equipment temperature is heated to 165℃, all the raw materials are plasticized, melted and mixed in the double-screw cylinder, and then extruded into a TPO dense film layer through a mold; The foam layer is transported to the film layer by the feeding system at the same time of film formation, hot-pressed and compounded with the TPO film layer to prepare a semi-finished product, the surface of the TPO dense layer of the semi-finished product is treated by on-line surface corona plasma with a power of 2kw; The components of the surface treatment layer are bright surface resin 40 parts, semi-bright resin 60 parts, hand feel aid 2 parts, crosslinking agent 4 parts, and water 30 parts by weight fraction, the raw materials are fully stirred and mixed uniformly, the mixed slurry of the surface treatment layer is coated on the surface of the TPO dense layer of the semi-finished product by printing, and the preparation is completed after drying at 120℃ for 3 minutes.

[0040] Example 6: In this embodiment, the functional component of the self-odor-reducing agent is alanine, the powder bulk density is 0.5g / cm 3 , the carrier is 20% by mass percentage, the functional component and the carrier are mixed at 130℃ in the extruder, and the self-odor-reducing agent is prepared after granulation; The components of the TPO dense layer are POE 30 parts, LDPE 30 parts, PP 20 parts, light stabilizer 0.5 part, self-odor-reducing agent 3 parts, and pigment 2 parts by weight fraction, the components are added to the feeding system of the double-screw extruder, the extrusion equipment temperature is heated to 160℃, all the raw materials are plasticized, melted and mixed in the double-screw cylinder, and then extruded into a TPO dense film layer through a mold; The foam layer is transported to the film layer by the feeding system at the same time of film formation, hot-pressed and compounded with the TPO film layer to prepare a semi-finished product, the surface of the TPO dense layer of the semi-finished product is treated by on-line surface corona plasma with a power of 2kw; The components of the surface treatment layer are bright surface resin 40 parts, semi-bright resin 60 parts, hand feel aid 2 parts, crosslinking agent 4 parts, and water 30 parts by weight fraction, the raw materials are fully stirred and mixed uniformly, the mixed slurry of the surface treatment layer is coated on the surface of the TPO dense layer of the semi-finished product by printing, and the preparation is completed after drying at 120℃ for 3 minutes.

[0041] Comparative Example: According to the method of Examples 4 to 6, except that the self-odor eliminating agent added in the TPO dense layer component is omitted, respectively, and the rest remains unchanged, the samples of Comparative Examples 4, 5 and 6 are prepared. The evaluation results are shown in Table 3 below using the same test method in Example 2. Table 3 Evaluation results of samples of Examples 4 to 6

[0042] The above merely describes preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be defined by the protection scope of the claims.

[0043] The parts not described in the present application are well-known to the person skilled in the art.

Claims

1. A self-deodorizing automotive TPO material, characterized by: The TPO material comprises a surface treatment layer, a TPO dense layer and a foam layer, the surface treatment layer and the foam layer are respectively located on two sides of the TPO dense layer; the TPO dense layer is composed of POE, LDPE, PP, light stabilizer, pigment and self-odor-reducing agent, wherein the self-odor-reducing agent comprises an organic compound containing amino, hydroxyl or carboxyl functional groups, and the self-odor-reducing agent is used to eliminate or partially eliminate odor substances containing N, S and C elements generated in the material itself or in the processing process of the TPO dense layer components, so as to reduce the odor of the material. The components of the TPO dense layer comprise, in parts by weight, POE 30-80 parts, LDPE 10-30 parts, PP 5-20 parts, light stabilizer 0.1-1 part, self-odor-reducing agent 1-7 parts and pigment 2-6 parts.

2. A self-deodorizing TPO material for vehicles according to claim 1, characterized in that: The self-odor-reducing agent is a mixture composed of a functional component and a carrier, and the carrier is PP or PE, and the carrier accounts for 20-50% in mass percentage.

3. A self-deodorizing TPO material for vehicles according to claim 2, characterized in that: The functional ingredient powder has a bulk density of 0.3 to 0.6 g / cm 3 The self-deodorizing agent is prepared by mixing the functional ingredient and the carrier in an extruder at 130 to 160°C and then granulating.

4. A self-deodorizing TPO material for vehicles according to claim 2, characterized in that: The functional component is selected from diethylene triamine or alanine.

5. A self-deodorizing TPO material for vehicles according to claim 1, characterized in that: The components of the surface treatment layer comprise, in parts by weight, bright resin 40-90 parts, semi-bright resin 10-60 parts, hand feel aid 0-10 parts, crosslinking agent 2-8 parts and water 0-50 parts.

6. A self-deodorizing TPO material for vehicles according to claim 5, characterized in that: The two resins in the components of the surface treatment layer are both water-based polycarbonate type polyurethane dispersion liquid with a solid content of 30-40%; the hand feel aid is an organic silicon material; and the crosslinking agent is one or more of modified polycarbodiimide crosslinking agent C-7070, aziridine crosslinking agent SaC-100 and oxazoline type crosslinking agent WS-500.

7. A self-deodorizing TPO material for vehicles according to claim 1, characterized in that: The foam layer is a polyolefin foam, 1.0-4.0 mm in thickness, 10-25 times in foaming ratio, and 40-100 kg / m 3 .

8. A self-deodorizing TPO material for vehicles according to claim 1, characterized in that: The TPO material further comprises a back coating layer coated on the side of the foam layer away from the TPO dense layer according to process requirements.

9. A process for the preparation of a self-deodorizing TPO material for automotive use according to any one of claims 1 to 8, characterized in that, The following steps are included: the components of the TPO dense layer are added into the feeding system of a double-screw extruder, the temperature of the extrusion equipment is heated to 150-200 DEG C, all raw materials are plasticized, melted and mixed in the double-screw cylinder, and then extruded into the TPO dense layer through a die; the foam layer is transported to the place where the TPO dense layer is formed into a film through a feeding system at the same time of film extrusion, and then hot-pressed and compounded with the TPO dense layer to form a semi-finished product; the raw materials of the surface treatment layer are weighed, fully stirred and mixed uniformly, and then coated on the surface of the TPO dense layer of the semi-finished product by printing.

10. The method of claim 9, wherein: The semi-finished product is subjected to corona treatment to reduce the surface tension before the surface treatment layer is coated.

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