CN111019235B - Composite material with soft touch feeling and preparation method thereof - Google Patents
Composite material with soft touch feeling and preparation method thereof Download PDFInfo
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Abstract
The application provides a composite material with soft touch and a preparation method thereof, belonging to the technical field of high polymer material modification. The composite material comprises the following raw materials: polypropylene resin, modified straw powder, a toughening agent, a lubricant, glass fiber, polyethylene and a compatilizer. The modification method of the modified straw powder comprises the following steps: soaking straw powder in strong alkali solution, washing to neutrality, drying, adding coupling agent and polyethylene wax, and treating at 70-90 deg.C for 20-40 min. The preparation method comprises the following steps: adding a mixture of polypropylene resin, a toughening agent, a lubricant and polyethylene from a main feeding port of an extruder, adding a mixture of modified straw powder and glass fiber from a side feeding port of the extruder, and then carrying out melt extrusion. The composite material prepared by the preparation method has soft touch and the appearance effect of the plant fiber.
Description
Technical Field
The application relates to the technical field of high polymer material modification, in particular to a composite material with soft touch and a preparation method thereof.
Background
Plant fiber is a natural high molecular material of biomass in the nature, and in recent years, the development and utilization of wood-plastic composite materials using the plant fiber as a raw material are rapidly developed. The method has been widely regarded as the method can effectively utilize agricultural and forestry wastes to prepare high-performance green and environment-friendly materials.
Polypropylene is one of the most important general-purpose plastics because of its light weight, low cost, easy processing and good combination properties, and is also a raw material for plastics which has been increasing rapidly in the automotive field in recent decades. The modified polypropylene material is widely used for automotive upholsteries, mainly comprises an instrument panel, a door panel, a stand column, a glove box and the like, and is usually coated by textile fabrics, so that the quality grade of the automotive upholsteries is improved.
The patent application number is CN201711433942.9, and the straw powder modified polypropylene material is adopted to realize the visual effect of the textile fabric coating material. Because the straw powder is a material with very strong polarity and has poor compatibility with a polyolefin non-polar material, the compatibility of the material made by the patent is poor, and the mechanical property and the processing effect of the material are influenced. Meanwhile, the material has the flocking-imitating effect only in the visual effect, but does not have the flocking-imitating effect in the tactile effect.
Disclosure of Invention
An object of the application is to provide a combined material and preparation method with soft sense of touch, this material is mainly through adding the elastomer material and the sense of touch auxiliary agent of soft sense of touch, realizes the sense of touch of the soft sense of touch in material surface, simultaneously, adds modified straw powder, makes the material have imitative flocking effect.
In a first aspect, an embodiment of the present application provides a composite material with a soft touch feeling, where the raw materials of the composite material include, by weight: 20-30 parts of polypropylene resin, 1-8 parts of modified straw powder, 20-35 parts of toughening agent, 0.6-1 part of lubricant and 10-25 parts of glass fiber5-15 parts of polyethylene and 3-8 parts of compatilizer. The modification method of the modified straw powder comprises the following steps: soaking straw powder in strong alkali solution, washing to neutrality, drying, adding coupling agent and polyethylene wax, and treating at 70-90 deg.C for 20-40 min. The bending strength of the composite material is 24-32MPa, the bending modulus is 1550-2The MFR (230 ℃,2.16kg) was 18.5-27.5g/10 min.
The straw powder has strong polarity, the surface bonding bond energy of the straw powder treated by the alkali liquor is increased, and the coupling agent is added, contains a bifunctional group, can combine the hydroxyl in the straw powder, and can also combine the nonpolar polyolefin resin, so that the straw powder and the polypropylene resin have better compatibility and better combination property. And the polyethylene wax mainly has the effect of coating the straw powder, so that the straw powder is not aged or yellowed under the high-temperature condition, and the heat-resistant stability of the straw powder is improved. The addition of the toughening agent, the polyethylene, the lubricant and the glass fiber can not only increase the mechanical strength of the material, but also enable the material to have soft touch. And the addition of the compatilizer can ensure that the compatibility of the glass fiber, the polypropylene resin and the toughener is better, so that the strength and the toughness of the composite material are better, the bending strength of the obtained composite material is 24-32MPa, the bending modulus is 1550- 2MFR (230 ℃,2.16kg) of 18.5-27.5g/10 min; meanwhile, the glass fiber can be prevented from being exposed, so that the soft touch effect of the composite material and the visual effect of the straw are improved, the surface of the material is prevented from being defective, and the requirements of modern consumers on automotive interiors are met.
In a second aspect, embodiments of the present application provide a method for preparing a composite material with a soft touch feeling, in which modified straw powder and glass fiber are mixed to obtain a first mixture, polypropylene resin, a toughening agent, a lubricant, a compatibilizer, and polyethylene are mixed to obtain a second mixture, the second mixture is fed from a main feeding port of an extruder, the first mixture is fed from a side feeding port of the extruder, and then melt-extruded.
Modified straw powder and glass fiber are added from the side feeding port, damage to the glass fiber and the modified straw powder caused by screw shearing of the extruder can be reduced, the residence time of the modified straw powder in the screw is shortened, and the risk of high-temperature aging and discoloration is reduced. The obtained material has soft touch and plant fiber effect, and the composite material has bending strength of 24-32MPa, bending modulus of 1550- 2The MFR (230 ℃,2.16kg) is 18.5-27.5g/10min, and the surface defects of the material are avoided, so as to meet the requirements of modern consumers for automobile interior.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The application provides a combined material with soft sense of touch, combined material's raw materials include according to parts by weight: 20-30 parts of polypropylene resin, 1-8 parts of modified straw powder, 20-35 parts of toughening agent, 0.6-1 part of lubricant, 10-25 parts of glass fiber, 5-15 parts of polyethylene and 3-8 parts of compatilizer.
In some embodiments, a composite material having a soft touch comprises, in parts by weight: 20 parts, 24 parts, 28 parts or 30 parts of polypropylene resin, 1 part, 3 parts, 5 parts or 8 parts of modified straw powder, 20 parts, 25 parts, 30 parts or 35 parts of toughening agent, 0.6 part, 0.7 part, 0.8 part, 0.9 part or 1 part of lubricating agent, 10 parts, 15 parts, 20 parts or 25 parts of glass fiber, 5 parts, 10 parts or 15 parts of polyethylene and 3 parts, 5 parts or 8 parts of compatilizer. Wherein, the straw powder can be one or more of wheat straw powder, corn straw powder, rice hull powder and peanut straw, and the application is not limited. Alternatively, the mesh size of the straw powder is 50 mesh to 70 mesh, for example: the mesh number of the straw powder is 50 meshes, 60 meshes, 65 meshes or 70 meshes.
The modification method of the modified straw powder comprises the following steps: soaking straw powder in strong alkali solution, washing to neutrality, drying, adding coupling agent and polyethylene wax, and treating at 70-90 deg.C for 20-40 min.
Optionally, the alkali solution can be potassium hydroxide solution or sodium hydroxide solution, the mass concentration of the alkali solution is 5-10%, and the soaking time is 40-80 min. For example: the alkali solution has a mass concentration of 5%, 8% or 10%, and the soaking time is 40min, 50min, 60min, 70min or 80 min.
Optionally, the coupling agent is a silane coupling agent or/and a titanate coupling agent. For example: the coupling agent is a silane coupling agent; the coupling agent is titanate coupling agent; the coupling agent is a mixture of a silane coupling agent and a titanate coupling agent.
The addition amounts of the coupling agent and the polyethylene wax are 1.5-2.5% of the mass of the straw powder. For example: the addition amount of the coupling agent accounts for 1.5 percent, 2 percent or 2.5 percent of the mass of the straw powder. The addition amount of the polyethylene wax accounts for 1.5 percent, 2 percent or 2.5 percent of the mass of the straw powder.
Soaking the straw powder in 5% sodium hydroxide solution for 60min, cleaning with distilled water to neutrality, and oven drying at 80 deg.C. Adding silane coupling agent KH-560 and polyethylene wax into the dried straw powder, and stirring at high speed at 70-90 deg.C for 20-40 min. Wherein the high-speed stirring temperature is 70 ℃, 80 ℃ or 90 ℃; the high speed stirring time is 20min, 30min or 40 min.
Straw powder itself polarity is stronger, uses the straw powder after the sodium hydroxide solution is handled, and surface bonding bond energy increases, adds silane coupling agent, and silane coupling agent contains bifunctional group, can combine the hydroxyl in the straw powder, also can combine nonpolar polyolefin resin, makes straw powder and polypropylene resin's compatibility better, and the bonding property is better. And the polyethylene wax mainly has the effect of coating the straw powder, so that the straw powder is not aged or yellowed under the high-temperature condition, and the heat-resistant stability of the straw powder is improved. The addition of the toughening agent, the polyethylene, the lubricant and the glass fiber can not only increase the mechanical strength of the material, but also enable the material to have soft touch and plant fiber effect, and avoid the surface of the material from generating defects so as to meet the requirements of modern consumers on automotive interior.
Alternatively, the polypropylene resin: the melt flow rate at a temperature of 230 ℃ and a load of 2.16kg is 80-100g/10 min. For example: the melt flow rate of the polypropylene resin under the conditions that the temperature is 230 ℃ and the load is 2.16kg is 80g/10min, 85g/10min, 90g/10min, 95g/10min or 100g/10 min. The material is made to have better flowability so that the composite material obtained has better surface quality and achieves better soft touch effect.
The polyethylene is linear low density polyethylene, and the melt flow rate is 15-20g/10min under the conditions of the temperature of 190 ℃ and the load of 2.16 kg. For example: the melt flow rate of the polyethylene at a temperature of 190 ℃ and a load of 2.16kg was 15g/10min, 18g/10min or 20g/10 min.
Optionally, the toughening agent is an elastomer selected from one or a combination of two of an ethylene-octene copolymer, a hydrogenated ethylene-butadiene-styrene copolymer. The lubricant is selected from one or two combinations of N, N' -ethylene bis stearic acid amide and pentaerythritol stearate. The addition of the toughening agent, the lubricant and the polyethylene material is matched with the modified straw powder and the polypropylene resin, so that the surface of the material is softer, and the effect of soft touch is achieved.
The glass fiber can be chopped glass fiber, the length of the chopped glass fiber is 3-5mm, and the diameter of the chopped glass fiber is 10-14 μm.
Furthermore, the composite material also comprises 5 to 15 parts of mineral filler and 0.3 to 0.5 part of glass fiber anti-exposure agent according to the parts by weight. In some embodiments, the composite further comprises 5 parts, 10 parts, or 15 parts of a mineral filler, and 0.3 part, 0.4 part, or 0.5 part of a glass fiber dewetting inhibitor.
Optionally, the mineral filler is selected from one or a combination of calcium carbonate and talc, the mineral filler having a D50 particle size of less than 5 μm, for example: the mineral filler has a D50 particle size of 4 μm, 3 μm or 2 μm. The glass fiber exposure preventing agent is TAF.
The composite material also comprises 0.4-0.8 part of antioxidant, 0.2-0.6 part of scratch-resistant agent, 0.2-0.5 part of light stabilizer and 0.3-1.5 parts of pigment according to parts by weight. In some embodiments, the composite further comprises an antioxidant 0.4, 0.6, or 0.8 parts, a scratch-resistant agent 0.2, 0.4, or 0.6 parts, a light stabilizer 0.2, 0.3, 0.4, or 0.5 parts, a pigment 0.3, 0.5, 1, or 1.5 parts.
Optionally, the compatibilizer is selected from one or a combination of two of maleic anhydride grafted polypropylene and maleic anhydride grafted polyethylene. For example: the compatilizer is maleic anhydride grafted polypropylene, and the grafting rate is more than 0.8 percent; the compatilizer is maleic anhydride grafted polyethylene, and the grafting rate is more than 0.8 percent; the compatilizer is a mixture of maleic anhydride grafted polypropylene and maleic anhydride grafted polyethylene.
Alternatively, the antioxidant consists of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] (antioxidant 1010) and tris (2, 4-di-tert-butylphenyl) phosphite (antioxidant 168) in a mass ratio of 1:0.8 to 1.2. For example: the mass ratio of the tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester to the tris (2, 4-di-tert-butylphenyl) phosphite is 1:0.8, 1:1 or 1: 1.2.
The scratch-resistant agent is selected from one or more of erucamide, silicone master batch and oleamide.
The light stabilizer consists of poly- { [6- [ (1,1,3,3, -tetramethylbutyl) -amino ]1,3,5, -triazine-2, 4-diyl ] [ (2,2,6, 6-tetramethylpiperidyl) -imino ] -1, 6-hexanediyl- [ (2,2,6, 6-tetramethylpiperidyl) -imino ] } (basf 944) and bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate (basf 770) in a mass ratio of 2: 0.8-1.2. For example: the mass ratio of poly- { [6- [ (1,1,3,3, -tetramethylbutyl) -amino ]1,3,5, -triazine-2, 4-diyl ] [ (2,2,6, 6-tetramethylpiperidinyl) -imino ] -1, 6-hexanediyl- [ (2,2,6, 6-tetramethylpiperidinyl) -imino ] } (basf 944) to bis (2,2,6, 6-tetramethyl-4-piperidinyl) sebacate (basf 770) was 2:0.8, 2:1 or 2: 1.2.
The pigment is selected from one or more of carbon black, titanium dioxide, titanium yellow and iron oxide red. The pigment can be selected according to the color requirement of the composite material, and the embodiment of the application is not limited. Wherein, the adding amount of the carbon black can be 0 to 0.1 part, and the carbon black is m717 of Kabot corporation; the addition amount of the titanium dioxide can be 0.3-1 part, and the titanium dioxide is rutile type titanium dioxide and can be R248 of Pan Steel group; the addition amount of the iron oxide red can be 0-0.1 part, and can be 4130FM of Basff; the addition amount of titanium yellow is 0-0.1 part, and can be V-9118 of Froude of America. Several pigments can be used in cooperation to achieve the color effect required by customers.
The preparation method of the composite material with soft touch comprises the steps of mixing the modified straw powder and the glass fiber to obtain a first mixture, mixing the polypropylene resin, the toughening agent, the lubricant, the compatilizer and the polyethylene to obtain a second mixture, adding the second mixture from a main feeding port of an extruder, adding the first mixture from a side feeding port of the extruder, and then carrying out melt extrusion.
And (3) independently and uniformly mixing the modified straw powder and the glass fiber by using a low-speed mixer to obtain a first mixture, wherein the mixing time is 5 min. And uniformly mixing the polypropylene resin, the toughening agent, the lubricant, the compatilizer and the polyethylene by using a high-speed stirrer to obtain a second mixture, wherein the mixing time is 5 min.
Modified straw powder and glass fiber are added from the side feeding port, damage to the glass fiber and the modified straw powder caused by screw shearing of the extruder can be reduced, the residence time of the modified straw powder in the screw is shortened, and the risk of high-temperature aging and discoloration is reduced.
Alternatively, the extruder comprises nine zones arranged in series, each zone having a temperature of: a first zone (170 + -5 ℃), a second zone (180 + -5 ℃), a third zone (180 + -5 ℃), a fourth zone (185 + -5 ℃), a fifth zone (185 + -5 ℃), a sixth zone (190 + -5 ℃), a seventh zone (190 + -5 ℃), an eighth zone (190 + -5 ℃), and a ninth zone (190 + -5 ℃). The extrusion temperature rises gradually so as to make the composite material shaping, and the temperature that makes modified straw powder receive rises gradually, avoids modified straw powder to change colour, so as to make the composite material who arrives have vegetable fibre's texture, and have soft sense of touch.
Further, the rotation speed of the extruder was 300 r/min. After extrusion, the composite material is cooled by a water tank, dried by a fan, cut into granules by a granulator, homogenized by a homogenizing bin and then obtained.
The bending strength of the composite material is 24-32MPa, and the bending modulus is 1550-MPa, tensile strength of 22-30.5MPa, and notch impact strength of 20-30KJ/M2The MFR (230 ℃,2.16kg) is 18.5-27.5g/10min, the Shore hardness is 50-62, and the soft touch feeling and the straw effect are both better.
In some embodiments, the resulting composite has a flexural strength of 24MPa, 26MPa, 28MPa, or 30MPa, a flexural modulus of 1550MPa, 1800MPa, 2000MPa, or 2250MPa, a tensile strength of 22MPa, 25MPa, 30MPa, or 30.5MPa, and a notched impact strength of 20KJ/M2、22KJ/M2、25KJ/M2Or 30KJ/M2MFR (230 ℃,2.16kg) of 18.5g/10min, 20g/10min, 25g/10min or 27.5g/10min, Shore hardness of 50, 55, 60 or 62.
The composite material with soft touch feeling and the preparation method thereof provided by the embodiment of the application have the beneficial effects that:
(1) the modified straw powder is added into the polypropylene resin, so that the modified straw powder is coated on textile fabrics, is low in cost and simple in processing technology, has plant fiber effect and soft touch feeling through color adjustment, and can meet the high requirement of modern consumers on automotive interior materials.
(2) The modified straw powder prepared by the method improves the compatibility of the straw powder material and the polypropylene resin, and can increase the heat-resistant stability of the straw powder. Straw powder and glass fiber are added to the side feeding port, the damage to glass fiber and straw powder caused by shearing of the extruder screw is reduced, meanwhile, the residence time of the straw powder in the screw is shortened, and the high-temperature aging discoloration risk is reduced.
(3) The composite material utilizes the rigidity of the glass fiber and the flexibility of the toughening agent, and combines the functions of other components, so that the surface of the material has soft touch texture, and the mechanical property and the technological property meet the requirements.
(4) In the composite material, the addition of the compatilizer can ensure that the glass fiber has better compatibility with the polypropylene resin and the toughening agent, so that the strength and the toughness of the composite material are better. And the glass fiber can be prevented from being exposed, so that the soft touch effect of the composite material and the visual effect of the straw are improved.
Examples of the experiments
S1, modifying the straw powder: soaking the straw powder in 5% NaOH solution for 60min, washing with distilled water to neutrality, drying at 80 deg.C, adding silane coupling agent KH-560 (2% of the straw powder), and polyethylene wax (2% of the straw powder), and stirring at 80 deg.C for 30 min.
S2, preparation of materials: polypropylene resin (melt flow rate 100g/10min at 230 ℃, 2.16kg load, brand K7100, beijing yanshan petrochemical); modified straw powder (wheat straw, 60 mesh, straw powder is commercially available); talcum powder (D50 particle size less than 5 μm); a compatibilizer (selected from the group consisting of easy and simple grades, GM-9801); the antioxidant is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester (antioxidant 1010), tris (2, 4-di-tert-butylphenyl) phosphite (antioxidant 168) (selected from basf 1010 and 168, mixed at a ratio of 1: 1); flexibilizer (ethylene-octene copolymer POE, Dow chemical 8137 was chosen); scratch resistance (erucamide, selected from british grass); glass fiber (chopped length of 3-5mm, diameter of 10-14 μm, selected from ECS305K-3 International in Chongqing); the light stabilizer is poly- { [6- [ (1,1,3,3, -tetramethylbutyl) -amino ]1,3,5, -triazine-2, 4-diyl ] [ (2,2,6, 6-tetramethylpiperidyl) -imino ] -1, 6-hexanediyl- [ (2,2,6, 6-tetramethylpiperidyl) -imino ] } and bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate (the grades 944 and 770 of basf are selected, and the grades are mixed according to the ratio of 2: 1); lubricant (N, N' -ethylene bis stearamide, selected from suzhou union chemical); 0.3 part of glass fiber exposure preventing agent (TAF); polyethylene (selected medium petrochemical DNDA8320, melt flow rate 20g/10min at 190 ℃ under 2.16kg load); carbon black (selected cabot M717); titanium dioxide (rutile type R248 from Pan Steel group is selected); iron oxide red (selected from basf 4130 FM); titanium yellow (selected from Froude V9118 in USA) with the content of each component as shown in Table 1.
TABLE 1 raw Material Components/kg of composite materials having Soft touch
Wherein, in table 1, the straw powder provided in comparative example 3 is unmodified; the straw powder provided in comparative example 4 was treated without a silane coupling agent, and the straw powder provided in comparative example 5 was treated without polyethylene wax.
Examples 1-6 and comparative examples 1-5 were prepared according to the following procedure for S3: and (2) independently and uniformly mixing the weighed modified straw powder and glass fiber for 5min by using a low-speed mixer, adding the mixture from a side feed inlet of an extruder, uniformly mixing the rest material components for 5min by using a high-speed mixer, and adding the mixture from a main feed inlet of the extruder.
The extrusion temperature of the extruder was divided into 9 zones: the composite material is prepared by a first area (170 +/-5 ℃), a second area (180 +/-5 ℃), a third area (180 +/-5 ℃), a fourth area (185 +/-5 ℃), a fifth area (185 +/-5 ℃), a sixth area (190 +/-5 ℃), a seventh area (190 +/-5 ℃), an eighth area (190 +/-5 ℃), a ninth area (190 +/-5 ℃), a main machine rotating speed of 300r/min, water tank cooling, fan blow-drying, grain cutting by a grain cutting machine, homogenization bin homogenization and the like.
Comparative example 6 is identical to the feed composition provided in example 3, except that all of the material of comparative example 6 was added from the main feed inlet.
The composite materials having soft touch provided in examples 1 to 6 and comparative examples 1 to 6 were examined for flexural strength, flexural modulus, tensile strength, notched impact strength, MFR (230 ℃,2.16kg)/g/10min, shore hardness (D), soft touch effect, and stalk effect.
Wherein the bending strength is tested according to ISO 178 standard; the flexural modulus was tested according to ISO 178; the tensile strength is tested according to ISO 527 standard; detecting the notch impact strength according to ISO180 standard; MFR was tested in accordance with GB/T3682-2000 (ISO 1133); shore hardness was tested according to GB/T9342-; the soft touch effect is directly touched by hands, and the straw effect is directly observed by eyes.
Soft touch evaluation: samples of 160 x 90 x 3mm size were injection molded using an injection molding machine, the dermatoglyph type was one, 5 testers touched the dermatoglyph face with their hands, scored according to the following scoring criteria, and the higher the number, the better the feel of the material. The tactile score criteria are given in table 2 below:
TABLE 2 tactile Scoring criteria
| Score of | Description of the invention |
| 5 | Comfortable soft touch |
| 4 | Has obvious soft touch feeling |
| 3 | Somewhat soft touch |
| 2 | Without soft touch |
| 1 | Feeling of burr |
Wherein, the detection results are shown in table 3:
TABLE 3 Properties of Soft touch composites
As can be seen from tables 2 and 3, the composite materials provided in examples 1-6 have better properties, including flexural strength of 24-32MPa, flexural modulus of 1550-2250MPa, tensile strength of 22-30.5MPa, and notched impact strength of 20-30KJ/M2MFR (230 ℃,2.16kg) of between 18.5 and 27.5g/10min, ShoreThe hardness is between 50 and 62. And the soft touch effect is better, more than three levels, and the straw effect is more than general.
In example 1, the amount of straw powder is 1, so the straw effect of the composite material provided in example 1 is general. Examples 2-4 provide composites with good properties. And the soft touch effect is good, and the straw effect is also better above the fourth grade. In examples 5 and 6, the composite material obtained without adding the antioxidant and the auxiliary agent had slightly inferior properties and the soft touch effect was three-level.
In comparative example 1, the amount of polypropylene was too large, the amount of glass fiber was small, the amount of toughening agent was small, and all properties of the obtained composite material did not meet the index. In comparative example 2, the amount of polypropylene was too small and the amount of toughening agent was too large, and the strength properties of the resulting composite did not meet the specification.
Compared with the example 3, the comparative examples 3 to 6 show that in the comparative example 3, the straw is not modified, the notch impact strength of the composite material is reduced, and the straw effect is poor; in the comparative example 4, no silane coupling agent is added during the pretreatment of the straws, so that the composite material has low tensile strength, relatively small bending strength and bending modulus and reduced notch impact strength to a certain extent; in comparative example 5, polyethylene wax is not added during straw treatment, and the straw effect is poor; in comparative example 6, if the modified straw powder and the glass fiber were also added from the main feeding port, the straw effect of the composite material was poor.
The embodiments described above are some, but not all embodiments of the present application. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Claims (9)
1. A composite material with a soft touch feeling is characterized by comprising the following raw materials in parts by weight:
20-30 parts of polypropylene resin, 1-8 parts of modified straw powder, 20-35 parts of toughening agent, 0.6-1 part of lubricant, 10-25 parts of glass fiber, 5-15 parts of polyethylene and 3-8 parts of compatilizer, wherein the melt flow rate of the polypropylene resin is 80-100g/10min under the conditions that the temperature is 230 ℃ and the load is 2.16 kg;
the modification method of the modified straw powder comprises the following steps: soaking straw powder in strong alkali solution, washing to neutrality, drying, adding coupling agent and polyethylene wax, and treating at 70-90 deg.C for 20-40 min;
the bending strength of the composite material is 24-32 MPa, the bending modulus is 1550- 2The MFR (230 ℃,2.16kg) was 18.5-27.5 g/10 min.
2. The composite material of claim 1, wherein the strong alkali solution has a concentration of 5-10% and a soaking time of 40-80 min.
3. The composite material of claim 1, wherein the coupling agent and the polyethylene wax are added in an amount of 1.5-2.5% by weight of the straw powder;
the coupling agent is a silane coupling agent or/and a titanate coupling agent.
4. The composite material according to claim 1, wherein the polyethylene has a melt flow rate of 15 to 20g/10min at a temperature of 190 ℃ and a load of 2.16 kg.
5. The composite material of claim 1, wherein the toughening agent is an elastomer selected from one or a combination of two of ethylene-octene copolymer, hydrogenated ethylene-butadiene-styrene copolymer; the lubricant is one or two of N, N' -ethylene bis stearamide and pentaerythritol stearate.
6. The composite material according to any one of claims 1 to 5, further comprising 5 to 15 parts by weight of a mineral filler, 0.3 to 0.5 part by weight of a glass fiber dewetting inhibitor;
the mineral filler is selected from one or two of calcium carbonate and talcum powder.
7. The composite material according to any one of claims 1 to 5, further comprising 0.4 to 0.8 part of antioxidant, 0.2 to 0.6 part of scratch-resistant agent, 0.2 to 0.5 part of light stabilizer and 0.3 to 1.5 parts of pigment by weight;
the compatilizer is one or two of maleic anhydride grafted polypropylene and maleic anhydride grafted polyethylene;
the antioxidant consists of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and phosphorous acid tri (2, 4-di-tert-butylphenyl) ester in a mass ratio of 1: 0.8-1.2;
the scratch-resistant agent is selected from one or a combination of erucamide, silicone master batch and oleamide;
the light stabilizer consists of poly- { [6- [ (1,1,3, 3-tetramethylbutyl) -amino ]1,3, 5-triazine-2, 4-diyl ] [ (2,2,6, 6-tetramethylpiperidyl) -imino ] -1, 6-hexanediyl- [ (2,2,6, 6-tetramethylpiperidyl) -imino ] } and bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate in a mass ratio of 2: 0.8-1.2;
the pigment is selected from one or more of carbon black, titanium dioxide, titanium yellow and iron oxide red.
8. A method for preparing a soft touch composite material according to any one of claims 1 to 7, comprising: adding a mixture of the polypropylene resin, the toughening agent, the lubricant, the compatilizer and the polyethylene from a main feeding port of an extruder, adding a mixture of the modified straw powder and the glass fiber from a side feeding port of the extruder, and then carrying out melt extrusion.
9. The method according to claim 8, characterized in that said extruder comprises nine successive zones, each at a temperature of: one zone (170 + -5 deg.C), two zones (180 + -5 deg.C), three zones (180 + -5 deg.C), four zones (185 + -5 deg.C), five zones (185 + -5 deg.C), six zones (190 + -5 deg.C), seven zones (190 + -5 deg.C), eight zones (190 + -5 deg.C), nine zones (190 + -5 deg.C).
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