CN112094599B - TPO interior trim skin and preparation method thereof - Google Patents

TPO interior trim skin and preparation method thereof Download PDF

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Publication number
CN112094599B
CN112094599B CN202011242737.6A CN202011242737A CN112094599B CN 112094599 B CN112094599 B CN 112094599B CN 202011242737 A CN202011242737 A CN 202011242737A CN 112094599 B CN112094599 B CN 112094599B
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layer
tpo
hot melt
melt adhesive
coating
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CN112094599A (en
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高金岗
李超
韩立业
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Suzhou Rui High Tech Materials Co ltd
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Suzhou Greentech Material Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/29—Laminated material
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L101/00—Compositions of unspecified macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
    • C09J175/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/35—Heat-activated
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2400/00—Presence of inorganic and organic materials
    • C09J2400/20—Presence of organic materials
    • C09J2400/24—Presence of a foam
    • C09J2400/243—Presence of a foam in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C09J2423/006—Presence of polyolefin in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C09J2423/04—Presence of homo or copolymers of ethene
    • C09J2423/046—Presence of homo or copolymers of ethene in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C09J2423/10—Presence of homo or copolymers of propene
    • C09J2423/106—Presence of homo or copolymers of propene in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2475/00—Presence of polyurethane

Abstract

The invention relates to the technical field of automotive interior trim, and particularly provides a TPO interior trim skin and a preparation method thereof. The invention provides a TPO interior trim skin, which comprises a surface coating layer, a TPO layer, a polypropylene foam layer and a hot melt adhesive layer from top to bottom. The TPO interior trim skin prepared by the method reduces the VOC release amount and volatility of the TPO interior trim skin, and improves the environmental protection property of the product; the peeling strength of the TPO interior skin after heating and cold-hot alternation is improved, and the TPO interior skin can meet the application requirements under different environments.

Description

TPO interior trim skin and preparation method thereof
Technical Field
The invention relates to the technical field of automotive interior trim, and particularly provides a TPO interior trim skin and a preparation method thereof.
Background
With the development of economy and the continuous improvement of people's life, automobiles become an indispensable tool for public travel, the automobiles are more and more applied in people's life, and the problems of in-vehicle air doubt, environmental health and safety and the like become one of the most concerned problems of Chinese consumers. The concentration of Volatile Organic Compounds (VOC) in the vehicle is an important index for representing the quality of air in the vehicle, and becomes an index strictly controlled by a main engine plant and a part supplier.
The adhesive between the TPO skin and the framework is one of the keys influencing the smell and VOC of the whole vehicle, and the control standard (GB 33372-. One-level supporting merchant generally chooses solvent-based or waterborne adhesive for use, but the production of gluing generally adopts and spouts the gluey process, will accurately master the degree of consistency and spout gluey grammes per square metre in order to satisfy peeling strength's requirement when spouting gluey, for satisfying the peeling requirements of one-level supporting merchant's gluing simultaneously, TPO automotive interior epidermis back need coat a waterborne or solvent-based finishing agent and change its polarity, and the technology is complicated, and easily leads to smell and VOC concentration great.
Disclosure of Invention
In order to solve the technical problems, the invention provides a TPO interior skin in a first aspect, which comprises a surface coating layer, a TPO layer, a polypropylene foam layer and a hot melt adhesive layer from top to bottom; the surface coating layer is made of water-based polyurethane resin; the content of isocyanate groups in the aqueous polyurethane resin is 15-20 wt%, and the viscosity at 23 ℃ is 1300-3200 mPa.s; the TPO layer is prepared from the following raw materials, by weight, 30-80 parts of TPV, 20-50 parts of polyolefin, 0.5-1 part of an auxiliary agent and 3-10 parts of a pigment; the specific gravity of the TPV is 0.89-0.92 g/cm3。
As a preferred technical scheme of the invention, the polyolefin is selected from one or a combination of more of high density polyethylene, linear low density polyethylene, low density polyethylene and polypropylene.
As a preferable technical scheme of the invention, the melt flow rate of the polypropylene is 6-10 g/10 min.
As a preferred technical scheme of the invention, the raw material for preparing the hot melt adhesive layer is polyurethane type hot melt adhesive or polyolefin type hot melt adhesive.
As a preferable technical scheme of the invention, the polyolefin type hot melt adhesive has the viscosity of 900-2000 mPa.s at 170 ℃ and the softening point of 75-95 ℃.
The second aspect of the present invention provides a method for preparing a TPO interior skin, comprising the steps of:
putting TPV, polyolefin, an auxiliary agent and a pigment into a high-speed stirrer according to parts by weight, uniformly mixing, and performing melt extrusion through an extruder to form a TPO layer;
step (2) coating a coating layer on the upper surface of the TPO layer, and drying;
step (3) welding and compounding the bottom surface of the TPO layer and the polypropylene foam layer;
and (4) coating hot melt adhesive on the bottom surface of the polypropylene foam layer by a roller to obtain a hot melt adhesive layer, drying and cooling to obtain the polypropylene foam layer.
As a preferred technical scheme of the invention, the gluing amount of the hot melt adhesive in the step (4) is 10-150 g/m2。
Has the advantages that:
1. the TPO interior trim skin prepared by the invention comprises a surface coating layer, a TPO layer, a polypropylene foam layer and a hot melt adhesive layer from top to bottom; the specific preparation raw materials of the TPO layer are limited, so that the compatibility among all components is good, and the specific waterborne polyurethane resin is further selected to be coated on the surface of the TPO layer, so that the VOC release amount and volatility of the TPO interior trim skin are reduced, the environmental protection performance of the product is improved, and the requirement of automobile manufacturers on the high quality of the interior trim materials is met;
2. according to the TPO interior skin prepared by the invention, the hot melt adhesive layer obtained by coating the specific hot melt adhesive is arranged on the bottom surface of the polypropylene foam layer to replace the traditional generally used adhesive, so that the TPO interior skin has better adhesion with the framework under different environments, the process is simple, the cost is saved, the VOC release amount is low, and the defects of high VOC and poor smell of the traditional TPO interior skin can be overcome;
3. in the preparation of the hot melt adhesive layer, a roller coating mode is selected, and the coating amount is limited to 10-150 g/m2The hot melt adhesive can be uniformly and firmly coated on the bottom surface of the polypropylene foam layer, so that the peeling strength of the TPO interior trim skin after heating and cold-hot alternation is favorably improved, and the application under different environments can be met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a TPO interior skin prepared in example 3 of the present invention;
FIG. 2 is a schematic view of the compounding process of the TPO interior skin polypropylene foam layer and the hot melt adhesive layer in the invention;
reference numerals: a-a surface coating layer; a B-TPO layer; a C-polypropylene foam layer; d-a hot melt adhesive layer; 1-glue coating roller; 2-coating a knife; 3-a polypropylene foam layer bottom surface; 5-hot melt adhesive.
Detailed Description
The disclosure may be understood more readily by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.
The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
In addition, the indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the number clearly indicates the singular.
In order to solve the above technical problems, a first aspect of the present invention provides a TPO interior skin, comprising a top-to-bottom surface coating layer A, TPO layer B, a polypropylene foam layer C, and a hot melt adhesive layer D, as shown in fig. 1.
Surface coating
In one embodiment, the surface coating layer is an aqueous finish.
In a preferred embodiment, the aqueous finishing layer is an aqueous polyurethane resin.
In a preferred embodiment, the aqueous polyurethane resin has an isocyanate group content of 15 to 20wt% and a viscosity of 1300 to 3200mPa.s at 23 ℃; preferably, the aqueous polyurethane resin has an isocyanate group content of 17 to 19wt% and a viscosity of 1400 to 3100mpa.s at 23 ℃.
In a more preferred embodiment, the aqueous polyurethane resin is purchased from basf LR 9056(HW 2000).
TPO layer
In one embodiment, the TPO layer is prepared from 30-80 parts by weight of TPV, 20-50 parts by weight of polyolefin, 0.5-1 part by weight of auxiliary agent and 3-10 parts by weight of pigment.
In a preferred embodiment, the TPO layer is prepared from 40-70 parts of TPV, 30-40 parts of polyolefin, 0.5-0.8 part of auxiliary agent and 5-9 parts of pigment by weight.
In a more preferred embodiment, the TPO layer is prepared from 55 parts TPV, 35 parts polyolefin, 0.7 parts adjuvant, 7 parts pigment, by weight.
TPV
In one embodiment, the TPV has a specific gravity of 0.89 to 0.92g/cm3(ii) a Preferably, the TPV has a specific gravity of 0.89g/cm3。
The TPV is commercially available and includes, but is not limited to, that purchased from so.f. ter.6N 5 a55, italy.
The specific gravity is measured by ASTM D792 test method.
The TPV is a Thermoplastic Vulcanizate (Thermoplastic vulcanizer, English) for short, and mainly comprises two parts, namely plastic serving as a continuous phase and rubber serving as a dispersed phase.
Polyolefins
In one embodiment, the polyolefin is selected from one or more of high density polyethylene, linear low density polyethylene, and polypropylene.
In a preferred embodiment, the polyolefin is polypropylene.
In a preferred embodiment, the melt flow rate of the polypropylene is 6 to 10g/10 min; more preferably, the melt flow rate of the polypropylene is 7g/10 min.
In a more preferred embodiment, the polypropylene is purchased from a Taiwan polypropylene 5061.
The melt flow rate is the melt flow rate and is measured according to the ISO-1133 test method.
Auxiliary agent
In one embodiment, the adjuvant is a light stabilizer.
In a preferred embodiment, the light stabilizer is a hindered amine light stabilizer.
The adjuvants are commercially available, including but not limited to light stabilizer 622 from the Beijing Tiangang adjuvant, Inc.
Pigment (I)
The pigment of the invention includes but is not limited to titanium dioxide, organic red, organic yellow and phthalocyanine blue, and can be added according to actual needs.
In one embodiment, the pigment is phthalocyanine blue.
The phthalocyanine blue may be purchased commercially, including but not limited to from ataxia south sea optica ltd.
The applicant found in experiments that the specific gravity of the TPO layer preparation raw material is selected to be 0.89-0.92 g/cm3The TPV and the polypropylene with the melting flow rate of 6-10 g/10min can well interact with other components, are favorable for improving the compatibility among the components, and are coated with each other to prepare the polypropyleneThe prepared TOP layer is low in VOC content, the waterborne polyurethane resin with the isocyanate group content of 15-20 wt% and the viscosity of 1300-3200 mPa.s at 23 ℃ is further selected to be coated on the surface of the TOP layer, so that the VOC release amount and volatility of the TPO interior trim skin are reduced, and the environmental protection property of the product is improved.
Polypropylene foam layer
In one embodiment, the polypropylene foam layer is a polypropylene foam.
The polypropylene foam may be commercially available, including but not limited to from waterlogging chemical industries.
Hot melt adhesive layer
In one embodiment, the raw material for preparing the hot melt adhesive layer is a hot melt adhesive, in particular a polyurethane type hot melt adhesive or a polyolefin type hot melt adhesive.
In a preferred embodiment, the raw material for preparing the hot melt adhesive layer is polyolefin type hot melt adhesive.
In a more preferred embodiment, the polyolefin-based hot melt adhesive has a viscosity of 900 to 2000mPa.s at 170 ℃ and a softening point of 75 to 95 ℃; preferably, the polyolefin hot melt adhesive has a viscosity of 1000 to 1500 mPa.s at 170 ℃ and a softening point of 80 to 90 ℃.
In a more preferred embodiment, the polyolefin-type hot melt adhesive is purchased from the German Hangao polyolefin hot melt adhesive TECHNOMET 3687.
The applicant finds that a hot melt adhesive layer obtained by coating a polyolefin type hot melt adhesive with the viscosity of 900-2000 mPa.s at 170 ℃ and the softening point of 75-95 ℃ is arranged on the bottom surface of a polypropylene foam layer, replaces the traditional commonly used adhesive, and can enable the TPO interior trim skin to be placed in a 110 ℃ circulating oven for 6 hours, and the adhesion between the TPO interior trim skin and a framework is still kept good after cold and hot alternation.
The second aspect of the present invention provides a method for preparing a TPO interior skin, comprising the steps of:
(1) putting TPV, polyolefin, an auxiliary agent and pigment into a high-speed stirrer according to the parts by weight, uniformly mixing, and performing melt extrusion through an extruder to form a TPO layer;
(2) coating an upper surface coating layer on the surface of the TPO layer, and drying;
(3) welding and compounding the bottom surface of the TPO layer and the polypropylene foam layer;
(4) and coating hot melt adhesive on a bottom roller of the polypropylene foam layer, drying and cooling to obtain the polypropylene foam layer.
In a preferred embodiment, the method for preparing the TPO interior skin comprises the steps of:
(1) putting TPV, polyolefin, an auxiliary agent and a pigment into a high-speed stirrer according to parts by weight, uniformly mixing at a stirring speed of 1200-1300 r/min, and performing melt extrusion through an extruder to form a TPO layer; wherein the extrusion temperature is 180-230 ℃;
(2) coating an upper surface coating layer on the surface of the TPO layer, and drying at 110-130 ℃;
(3) welding and compounding the bottom surface of the TPO layer and the polypropylene foam layer;
(4) and (3) coating hot melt adhesive on the bottom surface of the polypropylene foam layer by a roller, drying at 110-130 ℃, and cooling to obtain the polypropylene foam layer.
In a more preferred embodiment, the method of making the TPO interior skin comprises the steps of:
(1) putting TPV, polyolefin, an auxiliary agent and pigment into a high-speed stirrer according to the parts by weight, uniformly mixing at the stirring speed of 1250r/min, and performing melt extrusion through an extruder to form a TPO layer; wherein the extrusion temperature is 200 ℃;
(2) coating an upper surface coating layer on the surface of the TPO layer, and drying at 120 ℃;
(3) welding and compounding the bottom surface of the TPO layer and the polypropylene foam layer;
(4) and (3) coating hot melt adhesive on the bottom surface of the polypropylene foam layer by a roller, drying at 120 ℃, and cooling to obtain the polypropylene foam layer.
In one embodiment, the step of roll coating the bottom surface of the polypropylene foam layer with the hot melt adhesive layer comprises the following specific steps: the glue spreader 1 is heated to 180-200 ℃ through heat conduction oil, the bottom surface 3 of the polypropylene foam layer is placed upwards, the glue spreading amount is controlled to be 10-150 g/m2 by adjusting the angle of the coating knife 2, and the hot melt adhesive 5 is coated in a roll mode, as shown in the attached drawing 2.
In a preferred embodiment, the glue coating amount is 50-80 g/m2(ii) a More preferably, the coating weight is 65g/m2。
In the preparation of the hot melt adhesive layer, a roller coating mode is selected, and the coating amount is limited to 10-150 g/m2The hot melt adhesive can be uniformly and firmly coated on the bottom surface of the polypropylene foam layer, so that the peeling strength of the TPO interior trim skin after heating and cold-hot alternation is favorably improved, and the application under different environments can be met.
Examples
In order to better understand the above technical solutions, the following detailed descriptions will be provided with reference to specific embodiments. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention. In addition, the starting materials used are all commercially available, unless otherwise specified.
Example 1
Example 1 of the present invention provides a TPO interior skin comprising, from top to bottom, a surface coating layer, a TPO layer, a polypropylene foam layer, a hot melt adhesive layer.
The surface coating layer is a water-based coating layer; the water-based coating layer is water-based polyurethane resin and is purchased from basf LR 9056(HW 2000).
In a more preferred embodiment, the TPO layer is prepared from raw materials including, by weight, 40 parts TPV, 30 parts polyolefin, 0.5 parts adjuvant, and 5 parts pigment.
The TPV is purchased from so.f. ter.6N 5 a55, italy.
The polyolefin is polypropylene, purchased from Taiwan plastic polypropylene 5061.
The adjuvant is a hindered amine light stabilizer purchased from light stabilizer 622 of Beijing Tiangang adjuvant, Inc.
The pigment is phthalocyanine blue, purchased from the chemical company of jia nan hai jia.
The polypropylene foam layer is a polypropylene foam purchased from waterlogging chemical industries.
The raw material for preparing the hot melt adhesive layer is polyolefin type hot melt adhesive which is purchased from polyolefin hot melt adhesive TECHNOMET 3687 in Germany.
The preparation method of the TPO interior skin comprises the following steps:
(1) putting TPV, polyolefin, an auxiliary agent and pigment into a high-speed stirrer according to the parts by weight, uniformly mixing at the stirring speed of 1250r/min, and performing melt extrusion through an extruder to form a TPO layer; wherein the extrusion temperature is 200 ℃;
(2) coating an upper surface coating layer on the surface of the TPO layer, and drying at 120 ℃;
(3) welding and compounding the bottom surface of the TPO layer and the polypropylene foam layer;
(4) and (3) coating hot melt adhesive on the bottom surface of the polypropylene foam layer by a roller, drying at 120 ℃, and cooling to obtain the polypropylene foam layer.
The method for coating the hot melt adhesive layer on the bottom surface of the polypropylene foam layer by the roller comprises the following specific steps: heating the glue spreader to 190 deg.C with heat-conducting oil, placing the bottom of the polypropylene foam layer upward, and controlling the glue spreading amount to 65g/m by adjusting the angle of the coating knife2And performing roller coating of the hot melt adhesive.
Example 2
Embodiment 2 of the present invention provides a TPO interior skin, including a top-to-bottom surface coating layer, a TPO layer, a polypropylene foam layer, and a hot melt adhesive layer.
The surface coating layer is a water-based coating layer; the water-based coating layer is water-based polyurethane resin and is purchased from basf LR 9056(HW 2000).
In a more preferred embodiment, the TPO layer is prepared from raw materials including, by weight, 70 parts TPV, 40 parts polyolefin, 0.8 parts coagent, and 9 parts pigment.
The TPV is purchased from so.f. ter.6N 5 a55, italy.
The polyolefin is polypropylene, purchased from Taiwan plastic polypropylene 5061.
The adjuvant is a hindered amine light stabilizer purchased from light stabilizer 622 of Beijing Tiangang adjuvant, Inc.
The pigment is phthalocyanine blue, purchased from the chemical company of jia nan hai jia.
The polypropylene foam layer is a polypropylene foam purchased from waterlogging chemical industries.
The raw material for preparing the hot melt adhesive layer is polyolefin type hot melt adhesive which is purchased from polyolefin hot melt adhesive TECHNOMET 3687 in Germany.
The preparation method of the TPO interior skin comprises the following steps:
(1) putting TPV, polyolefin, an auxiliary agent and pigment into a high-speed stirrer according to the parts by weight, uniformly mixing at the stirring speed of 1250r/min, and performing melt extrusion through an extruder to form a TPO layer; wherein the extrusion temperature is 200 ℃;
(2) coating an upper surface coating layer on the surface of the TPO layer, and drying at 120 ℃;
(3) welding and compounding the bottom surface of the TPO layer and the polypropylene foam layer;
(4) and (3) coating hot melt adhesive on the bottom surface of the polypropylene foam layer by a roller, drying at 120 ℃, and cooling to obtain the polypropylene foam layer.
The method for coating the hot melt adhesive layer on the bottom surface of the polypropylene foam layer by the roller comprises the following specific steps: heating the glue spreader to 190 deg.C with heat-conducting oil, placing the bottom of the polypropylene foam layer upward, and controlling the glue spreading amount to 65g/m by adjusting the angle of the coating knife2And performing roller coating of the hot melt adhesive.
Example 3
Example 3 of the present invention provides a TPO interior skin comprising a top-down surface coating layer A, TPO layer B, a polypropylene foam layer C, and a hot melt adhesive layer D, as shown in fig. 1.
The surface coating layer is a water-based coating layer; the water-based coating layer is water-based polyurethane resin and is purchased from basf LR 9056(HW 2000).
In a more preferred embodiment, the TPO layer is prepared from 55 parts TPV, 35 parts polyolefin, 0.7 parts adjuvant, 7 parts pigment, by weight.
The TPV is purchased from so.f. ter.6N 5 a55, italy.
The polyolefin is polypropylene, purchased from Taiwan plastic polypropylene 5061.
The adjuvant is a hindered amine light stabilizer purchased from light stabilizer 622 of Beijing Tiangang adjuvant, Inc.
The pigment is phthalocyanine blue, purchased from the chemical company of jia nan hai jia.
The polypropylene foam layer is a polypropylene foam purchased from waterlogging chemical industries.
The raw material for preparing the hot melt adhesive layer is polyolefin type hot melt adhesive which is purchased from polyolefin hot melt adhesive TECHNOMET 3687 in Germany.
The preparation method of the TPO interior skin comprises the following steps:
(1) putting TPV, polyolefin, an auxiliary agent and pigment into a high-speed stirrer according to the parts by weight, uniformly mixing at the stirring speed of 1250r/min, and performing melt extrusion through an extruder to form a TPO layer; wherein the extrusion temperature is 200 ℃;
(2) coating an upper surface coating layer on the surface of the TPO layer, and drying at 120 ℃;
(3) welding and compounding the bottom surface of the TPO layer and the polypropylene foam layer;
(4) and (3) coating hot melt adhesive on the bottom surface of the polypropylene foam layer by a roller, drying at 120 ℃, and cooling to obtain the polypropylene foam layer.
The method for coating the hot melt adhesive layer on the bottom surface of the polypropylene foam layer by the roller comprises the following specific steps: the glue spreader 1 is heated to 190 ℃ through heat conduction oil, the bottom surface 3 of the polypropylene foam layer is placed upwards, the glue spreading amount is controlled to be 65g/m2 by adjusting the angle of the glue spreader 2, and the hot melt glue 5 is rolled and coated, as shown in the attached figure 2.
Example 4
Example 4 of the present invention provides a TPO interior skin, the specific implementation of which is the same as example 3, except that the polyolefin type hot melt adhesive is purchased from Loctite technoit KS 300.
Example 5
Example 5 of the present invention provides a TPO interior skin, which is the same as example 3 in the specific embodiment except that the aqueous polyurethane resin is purchased from stahl PU-406.
Example 6
Example 6 of the present invention provides a TPO interior skin, the detailed description of which is the same as example 3, except that the TPV is purchased from exxon Mobil 251-80W 232.
Example 7
Example 7 of the present invention provides a TPO interior skin, which is embodied in the same manner as in example 3, except that the polypropylene is purchased from SK H870F, korea.
Performance testing
1. Peel Strength test
The peel strength of the prepared TPO interior trim skin is tested according to ISO 2411, the test value is more than or equal to 10N/5cm, or the tear of 100 percent foam is marked as 1, otherwise, the test value is marked as 2. The 100% foam tear means that the polypropylene foam layer is completely left on the skeleton.
2. Post heat peel strength test
Placing the prepared TPO interior skin in a circulating oven at 110 ℃ for 6h, cooling to room temperature, and carrying out peel strength test according to ISO 2411, wherein the test value is more than or equal to 10N/5cm or 100% foam tear is marked as 1, otherwise, the test value is marked as 2.
3. Peel Strength test after Cold and Heat alternation
The TPO interior skin prepared was subjected to 5 temperature cycle tests, each cycle comprising:
a) keeping the temperature at 90 plus or minus 2 ℃ for 6 h;
b) keeping the minimum relative humidity of 90% for 4h at the temperature of (40 +/-2) ° C;
c) keeping the temperature at (-40 +/-2) DEG C for 4 h;
d) keeping the temperature at (23 +/-2) DEG C for 1 h.
And (4) after the circulation is finished, carrying out a peel strength test according to ISO 2411 standard, and recording the test value as 1 when the test value is more than or equal to 10N/5cm or 100% foam tear, otherwise, recording as 2.
4. Odor test
Performing an odor test on the prepared TPO interior skin according to PV3900, and recording the odor grade; wherein the odor grade is 1 in the range of 2.5-3.0, 2 in the range of 3.0-3.5 (excluding 3.0), and 3 in the range of 3.5 or more.
TABLE 1
Figure 716183DEST_PATH_IMAGE001
The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim as broad a scope as is contemplated, and the examples presented herein are merely illustrative of selected implementations in accordance with all possible combinations of examples. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Also, where numerical ranges are used in the claims, subranges therein are included, and variations in these ranges are also to be construed as possible being covered by the appended claims.

Claims (3)

1. The TPO interior trim skin is characterized by comprising a surface coating layer, a TPO layer, a polypropylene foam layer and a hot melt adhesive layer from top to bottom; the surface coating layer is made of water-based polyurethane resin; the TPO layer is prepared from the following raw materials, by weight, 30-80 parts of TPV, 20-50 parts of polyolefin, 0.5-1 part of an auxiliary agent and 3-10 parts of a pigment;
the waterborne polyurethane resin is purchased from basf LR 9056-HW 2000;
the TPV is purchased from so.f. ter.6N 5 a55, italy;
the polyolefin is polypropylene, purchased from tai-plast polypropylene 5061;
the raw material for preparing the hot melt adhesive layer is polyolefin type hot melt adhesive which is purchased from polyolefin hot melt adhesive TECHNOMET 3687 in Germany.
2. A method of making the TPO interior skin of claim 1, comprising the steps of:
putting TPV, polyolefin, an auxiliary agent and a pigment into a high-speed stirrer according to parts by weight, uniformly mixing, and performing melt extrusion through an extruder to form a TPO layer;
step (2) coating a coating layer on the upper surface of the TPO layer, and drying;
step (3) welding and compounding the bottom surface of the TPO layer and the polypropylene foam layer;
and (4) coating hot melt adhesive on the bottom surface of the polypropylene foam layer by a roller to obtain a hot melt adhesive layer, drying and cooling to obtain the polypropylene foam layer.
3. The method for preparing TPO interior skin according to claim 2, wherein the coating amount of hot melt adhesive in the step (4) is 10-150 g/m2。
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