CN116120661A - Composite fiber modified PP material and preparation method and application thereof - Google Patents
Composite fiber modified PP material and preparation method and application thereof Download PDFInfo
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- CN116120661A CN116120661A CN202211680601.2A CN202211680601A CN116120661A CN 116120661 A CN116120661 A CN 116120661A CN 202211680601 A CN202211680601 A CN 202211680601A CN 116120661 A CN116120661 A CN 116120661A
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- 239000000835 fiber Substances 0.000 title claims abstract description 61
- 239000002131 composite material Substances 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 102000008186 Collagen Human genes 0.000 claims abstract description 48
- 108010035532 Collagen Proteins 0.000 claims abstract description 48
- 229920001436 collagen Polymers 0.000 claims abstract description 48
- 239000003365 glass fiber Substances 0.000 claims abstract description 47
- 239000012783 reinforcing fiber Substances 0.000 claims abstract description 29
- 239000011347 resin Substances 0.000 claims abstract description 22
- 229920005989 resin Polymers 0.000 claims abstract description 22
- -1 polysiloxane Polymers 0.000 claims abstract description 18
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 17
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 15
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- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 2
- 229920001911 maleic anhydride grafted polypropylene Polymers 0.000 claims description 2
- 125000003368 amide group Chemical group 0.000 claims 1
- 230000002195 synergetic effect Effects 0.000 abstract description 7
- 230000009471 action Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 229920006351 engineering plastic Polymers 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 abstract description 3
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- 238000012986 modification Methods 0.000 abstract description 2
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- 230000000052 comparative effect Effects 0.000 description 11
- 238000012360 testing method Methods 0.000 description 6
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 description 5
- 239000004594 Masterbatch (MB) Substances 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 229920001684 low density polyethylene Polymers 0.000 description 3
- 239000004702 low-density polyethylene Substances 0.000 description 3
- FATBGEAMYMYZAF-KTKRTIGZSA-N oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 description 3
- FATBGEAMYMYZAF-UHFFFAOYSA-N oleicacidamide-heptaglycolether Natural products CCCCCCCCC=CCCCCCCCC(N)=O FATBGEAMYMYZAF-UHFFFAOYSA-N 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- HXIQYSLFEXIOAV-UHFFFAOYSA-N 2-tert-butyl-4-(5-tert-butyl-4-hydroxy-2-methylphenyl)sulfanyl-5-methylphenol Chemical compound CC1=CC(O)=C(C(C)(C)C)C=C1SC1=CC(C(C)(C)C)=C(O)C=C1C HXIQYSLFEXIOAV-UHFFFAOYSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000005227 gel permeation chromatography Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000012764 mineral filler Substances 0.000 description 2
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- 229920001169 thermoplastic Polymers 0.000 description 2
- 241000589291 Acinetobacter Species 0.000 description 1
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 description 1
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 description 1
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 150000001408 amides Chemical group 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
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- 229920002678 cellulose Polymers 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
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- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 description 1
- 238000007602 hot air drying Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002530 phenolic antioxidant Substances 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides a composite fiber modified PP material, and a preparation method and application thereof, and belongs to the technical field of engineering plastics. The composite fiber modified PP material comprises the following components in parts by weight: 60-85 parts of PP resin, 5-20 parts of collagen reinforced fiber, 10-40 parts of glass fiber, 0.27-1.4 parts of polysiloxane, 2-5 parts of compatilizer, 0.1-2 parts of lubricant and 0.1-1 part of antioxidant. According to the invention, the collagen reinforcing fiber and the glass fiber are adopted to carry out blending modification on PP, and under the action of polysiloxane, the collagen reinforcing fiber and the glass fiber can be well dispersed in a PP matrix, so that the synergistic effect is realized, and the strength of the PP material is improved; meanwhile, the collagen reinforced fiber has an improvement effect on the orientation of the glass fiber, so that the warping degree of the PP material is reduced.
Description
Technical Field
The invention relates to the technical field of engineering plastics, in particular to a composite fiber modified PP material, a preparation method and application thereof.
Background
Polypropylene (PP) is widely used in the fields of packaging, electronics, home, building materials, textiles and the like due to the characteristics of high bending strength, good chemical resistance, low density, good mechanical properties and the like.
In the prior art, in order to further improve the mechanical properties and heat resistance of PP, glass fibers are generally used to enhance and modify PP. However, since glass fibers have a large aspect ratio, there is a large difference in shrinkage in the transverse and longitudinal directions, and the glass fibers are oriented in the flow direction during injection molding of the glass fiber reinforced PP, resulting in a large difference between shrinkage in the flow direction and shrinkage perpendicular to the flow direction. The warpage of the glass fiber reinforced PP material is too high due to the difference and unbalance of shrinkage.
In order to improve the warpage of glass fiber reinforced PP, the following methods are mainly used at present: (1) By adding other mineral fillers such as mica, montmorillonite and the like, the influence of orientation of glass fibers in a PP system is reduced, and warping is improved; however, this method requires the introduction of a relatively large amount of other mineral fillers, which not only makes the density of the material too high, but may also affect the impact strength of the material; (2) The PP is enhanced and modified by screening glass fibers with specific morphology, such as glass fibers with specific length-diameter ratio, cross section length, width and the like are selected to improve the warp; however, the method has too high requirements on the glass fiber, and limits the application of the method to large-scale industrial production.
Chinese patent application CN 114085446A discloses a creep-resistant composite material comprising a thermoplastic polymer and modified collagen fibers, the creep resistance of the thermoplastic polymer being improved by the addition of the modified collagen fibers. However, the addition of collagen fibers does not provide the reinforcing effect as that of glass fibers, and the strength of the material is poor. In addition, although both creep resistance and warp resistance are among the deformation properties of interest for engineering plastic materials, they are still different properties: the creep resistance investigation is to apply constant external force to a material sample at a fixed temperature, and measure the deformation of the material sample for a fixed time or the breaking length and time; the warp resistance is examined as the macroscopic deformation phenomenon generated after crystallization occurs under certain temperature and humidity adjustment after the part is processed, molded and demolded.
Accordingly, there is a need to provide a modified PP material with high strength, low warpage.
Disclosure of Invention
The invention aims to overcome the defects of low strength and high warping in the prior art and provides a composite fiber modified PP material, wherein glass fibers and collagen reinforcing fibers are used as composite fibers to carry out reinforcing modification on PP, and the prepared PP material has low warping, high strength and less surface floating fibers.
Another object of the present invention is to provide a method for preparing the above composite fiber-modified PP material.
Another object of the present invention is to provide the use of the above composite fiber modified PP material.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the composite fiber modified PP material comprises the following components in parts by weight:
in the PP material, the collagen reinforcing fiber and the glass fiber are adopted to blend and modify the PP, and under the action of polysiloxane, the collagen reinforcing fiber and the glass fiber can be well dispersed in a PP matrix, so that the synergistic effect is realized, and the strength of the PP material is improved under the combined action. Meanwhile, the collagen reinforced fiber has an improvement effect on the orientation of the glass fiber, so that the warping degree of the PP material is reduced.
The collagen reinforcing fiber is a reinforcing fiber synthesized by modifying organic protein, is a degradable fiber, and mainly comprises cellulose.
Preferably, the average fineness of the collagen reinforcing fibers is 1 to 3mm.
Preferably, the glass fibers have an average diameter of 8 to 11 μm.
The inventor researches find that when the average fineness of the collagen reinforced fiber is 1-3 mm and the average diameter of the glass fiber is 8-11 mu m, the collagen reinforced fiber and the glass fiber have more excellent synergistic effect after being compounded, and the reinforcing effect on the PP material is more excellent.
Preferably, the weight ratio of the collagen reinforcing fiber to the glass fiber is 1: (1.5-3).
The collagen reinforcing fiber and the glass fiber are compounded according to a proper weight ratio. The amount of the collagen reinforcing fiber is too large, the amount of the glass fiber is too small, and the prepared PP material has lower strength; when the amount of the collagen reinforcing fibers is too small and the amount of the glass fibers is too large, the warping degree of the PP material is too high, the floating fibers are too large, and the strength of the PP material is insufficient because the collagen reinforcing fibers cannot play a role in synergistic enhancement.
Preferably, the isoelectric point of the collagen reinforcing fiber is 6 to 8.
The surface of the collagen reinforced fiber is modified, different polar groups can be introduced, and the hydrophilicity of the surface of the fiber is increased or the chemical reactivity of the surface of the fiber is improved.
Changing the charge or isoelectric point of the collagen-reinforced fiber, such as increasing carboxyl groups on the peptide chain, so that the isoelectric point is reduced; increasing the amino groups on the peptide chain increases the isoelectric point. A common modification method is to weaken the hydrogen bonding between fibers using low temperatures, which is advantageous for dispersing the fibers. The inventor researches and discovers that when the isoelectric point of the collagen reinforced fiber is 6-8, the collagen reinforced fiber has good dispersibility in the PP system, and the synergistic effect with the glass fiber is optimal, and the prepared composite fiber modified PP material has higher strength and lower warping.
For the composite fiber modified PP material of the present invention, the polysiloxane is added in the form of polysiloxane master batch. The polysiloxane master batch has a polysiloxane content of 55-70 wt.%, and takes low-density polyethylene as a carrier, wherein the low-density polyethylene has a melt flow rate of 4g/10min at 230 ℃ under 2.16 kg.
Preferably, the weight average molecular weight of the PP resin is 9000-20000, and the melt flow rate of the PP resin under the condition of 230 ℃ and 2.16kg is 5-50 g/10min.
The weight average molecular weight of the PP resin was measured by Gel Permeation Chromatography (GPC). The melt flow rate of the PP resin was determined according to ISO 1133-2011 standard method.
Preferably, the lubricant is an amide type lubricant.
Optionally, the lubricant is at least one of ethylene bisstearamide, erucamide and oleamide. More preferably, the lubricant is ethylene bis-stearamide.
The ethylene bisstearamide has better temperature resistance and better thermal stability, and in the PP system, the warping degree of the PP material after aging can be kept low.
Preferably, the antioxidants include hindered phenolic antioxidants and phosphite antioxidants.
Optionally, the hindered phenol antioxidant is at least one of antioxidant 1010, antioxidant AO 20 and antioxidant AO 30.
Optionally, the phosphite antioxidant is at least one of antioxidant 168 and antioxidant 412 s.
The compatibilizing agent may be one commonly used in the art.
Preferably, the compatibilizer is maleic anhydride grafted polypropylene.
The invention also provides a preparation method of the composite fiber modified PP material, which comprises the following steps:
s1, mixing dried collagen-reinforced fibers, polysiloxane, part of PP resin and a lubricant to obtain a mixture A;
s2, mixing the mixture A, the rest of PP resin, the compatilizer and the antioxidant to obtain a mixture B;
s3, adding the mixture B to a main feeding port of an extruder, adding glass fibers to a side feeding port of the extruder, and performing melt mixing, extrusion and granulation to obtain the composite fiber modified PP material.
In step S1, the part of PP resin means 40 to 60wt.% of PP resin; in step S2, the remaining PP resin means 40 to 60wt.% of the PP resin remaining.
Preferably, in the step S1, the drying refers to hot air drying at 70-90 ℃ for 8-12 hours.
Preferably, in the step S3, the extruder is a twin-screw extruder, the length-diameter ratio of the screw is 36-44:1, and the extrusion temperature of the twin-screw extruder is 190-210 ℃.
The invention also protects the application of the composite fiber modified PP material in preparing air conditioner fan blades, warmer shells and electric tool parts.
Compared with the prior art, the invention has the beneficial effects that:
the invention develops a PP material with high strength, low warpage and low floating fiber. The PP is modified by blending the collagen reinforcing fiber and the glass fiber, and the collagen reinforcing fiber and the glass fiber can be well dispersed in the PP matrix under the action of polysiloxane, so that the synergistic effect is realized, and the strength of the PP material is improved under the combined action. Meanwhile, the collagen reinforced fiber has an improvement effect on the orientation of the glass fiber, so that the warping degree of the PP material is reduced.
Detailed Description
For a better description of the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to the following specific examples, which are not intended to limit the present invention in any way.
The sources of raw materials used in the examples and comparative examples of the present invention are as follows:
PP-1, PP resin, acinetobacter petrochemical PP 1100N, melt flow rate under the conditions of 230 ℃ and 2.16kg is 5g/10min, and weight average molecular weight is 15000;
PP-2, PP resin, basel PP HP740T, melt flow rate at 230 ℃, 2.16kg of 50g/10min, weight average molecular weight 9000;
glass fiber-1, a special glass fiber of boulder, and an average diameter of 8 μm;
glass fiber-2, giant stone E7 glass fiber, with average diameter of 10 μm;
glass fiber-3, giant stone 508A glass fiber, average diameter of 13 μm
Collagen reinforced fiber-1, yaobang A, changzhou, with average fineness of 1-3 mm and isoelectric point of 6;
collagen reinforced fiber-2, yaobang B, changzhou, with average fineness of 1-3 mm and isoelectric point of 8;
collagen reinforced fiber-3, yaobang C, changzhou, with average fineness of 1-3 mm and isoelectric point of 5;
collagen reinforced fiber-4, yaobang D, changzhou, with average fineness of 5-6 mm and isoelectric point of 6;
polysiloxane master batch, zhejiang Jiahua GT-800, takes low density polyethylene as a carrier, and the content of polysiloxane is 55 wt%;
a compatibilizer, maleic anhydride grafted PP, commercially available;
a lubricant, ethylene bis-stearamide, commercially available; oleamide, commercially available;
antioxidants, mixtures of antioxidants 1010 and 168, are commercially available.
Unless specifically stated otherwise, the reagents, methods and apparatus employed in the present invention are those conventional in the art. The reagents and materials used in the present invention are commercially available unless otherwise specified.
Examples 1 to 16
Examples 1-16 respectively provide a PP material, the component content is shown in Table 1, and the preparation method is as follows:
s1, drying collagen reinforced fiber for 8-12 hours at 70-90 ℃ by hot air, and then mixing the collagen reinforced fiber with polysiloxane master batch, 50wt.% of PP resin and lubricant to obtain a mixture A;
s2, mixing the mixture A, the rest 50wt.% of PP resin, the compatilizer and the antioxidant to obtain a mixture B;
s3, adding the mixture B to a main feeding port of a double-screw extruder, adding glass fibers to a side feeding port of the double-screw extruder, wherein the length-diameter ratio of a screw is 44:1, and the extrusion temperature of the double-screw extruder is 190-210 ℃; and (3) carrying out melt mixing, extrusion granulation to obtain the PP material.
TABLE 1-1
TABLE 1-2
Comparative examples 1 to 7
Comparative examples 1 to 7 respectively provide a PP material, the component contents are shown in Table 2, and the preparation method is as follows:
s1, if collagen reinforcing fibers exist, drying the collagen reinforcing fibers at 70-90 ℃ with hot air for 8-12 hours, and then mixing the collagen reinforcing fibers with polysiloxane master batches (if the polysiloxane master batches exist), 50wt.% of PP resin and lubricant to obtain a mixture A;
if no collagen reinforcing fiber exists, mixing polysiloxane master batches (if any), 50wt.% of PP resin and a lubricant to obtain a mixture A;
s2, mixing the mixture A, the rest 50wt.% of PP resin, the compatilizer and the antioxidant to obtain a mixture B;
s3, adding the mixture B to a main feeding port of a double-screw extruder, adding glass fibers (if any) to a side feeding port of the double-screw extruder, wherein the length-diameter ratio of a screw is 44:1, and the extrusion temperature of the double-screw extruder is 190-210 ℃; and (3) carrying out melt mixing, extrusion granulation to obtain the PP material.
TABLE 2
Performance testing
The performance test was performed on the PP materials prepared in the above examples and comparative examples, and the specific method is as follows:
(1) Flexural strength: measured according to GB/T9341-2008;
(2) Warp degree: drying the PP material, then injection molding the PP material into a square plate with the thickness of 100 x 1.5mm, placing the square plate on a flat tabletop, and measuring the highest distance between 4 corners of the square plate and the tabletop to obtain the initial warping degree of the square plate; baking the square plate at 100 ℃ for 3 hours, placing the baked square plate on a flat tabletop, and measuring the highest distance between 4 corners of the square plate and the tabletop to obtain the baked warp of the square plate; the lower the warpage is, the better the warpage resistance of the material is;
(3) Appearance of floating fiber: injecting PP material into a square plate with the thickness of 100 x 2.0mm, drawing 100 square grids with the thickness of 10 x 10mm on the surface of the square plate, and observing the number of square grids with floating fibers by naked eyes under a standard D65 light source to evaluate the degree of the floating fibers; the square lattice with floating fiber is preferably 0-5%, the square lattice with floating fiber is preferably 5-35% (excluding 5%), and the square lattice with floating fiber is preferably 35-100% (excluding 35%).
The test results of the examples are shown in Table 3, and the test results of the comparative examples are shown in Table 4.
TABLE 3 Table 3
TABLE 4 Table 4
According to the test results of table 3, the PP material of each embodiment of the present invention has excellent or good appearance of floating fiber; the strength of the PP material is high, the bending strength is more than or equal to 70MPa, wherein the bending strength of the PP material with the total content of the collagen reinforcing fiber and the glass fiber being more than or equal to 30 parts is more than or equal to 86MPa; the initial warping of the PP material is less than or equal to 1.42mm, and the warping after baking is still less than or equal to 2.77mm.
From examples 1 to 7, it can be seen that when the isoelectric point of the collagen reinforcing fiber is 6 to 8, the average fineness of the collagen reinforcing fiber is 1 to 3mm, and the average diameter of the glass fiber is 8 to 11 μm, the synergistic effect of the collagen reinforcing fiber and the glass fiber is better, so that the prepared PP material has higher strength, lower warpage and good appearance of floating fiber.
Comparing the test results of example 1 and example 8, it can be seen that the ethylene bisstearamide is used as a lubricant, the obtained PP material has better comprehensive effect, the oleamide has relatively poorer thermal stability, and the PP material obtained as a lubricant has higher warping degree after baking.
According to the test results of examples 1 and 9-12, when the weight ratio of the collagen reinforced fiber to the glass fiber is 1:1.5-3, the compounding effect of the collagen reinforced fiber and the glass fiber is relatively better, and the PP material has higher strength, low warpage and good floating fiber appearance.
Comparative examples 1 to 3 are PP materials lacking collagen reinforcing fibers, glass fibers and polysiloxane masterbatches, respectively. In the absence of a certain component, PP materials cannot combine acceptable flexural strength, warpage and float appearance.
The content of the collagen reinforcing fiber in the comparative example 4 is too small, and the warpage of the prepared PP material is improved to a certain extent compared with that of the comparative example 1, but is still obviously inferior to that of the example; in comparative example 5, the content of the collagen reinforcing fiber was excessive, and although the initial warpage was improved, the warpage of the PP material was greatly increased after baking, and the warpage after baking reached 3.66mm, which did not meet the practical use requirements.
The content of glass fiber in comparative example 6 is too small, and the prepared PP material has low strength; the excessive content of glass fiber in comparative example 7 not only results in poor appearance of the floating fiber of the PP material, but also results in excessive warpage of the material.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present invention.
Claims (10)
1. The composite fiber modified PP material is characterized by comprising the following components in parts by weight:
2. the composite fiber-modified PP material according to claim 1, wherein the average fineness of the collagen reinforcing fiber is 1 to 3mm.
3. The composite fiber modified PP material according to claim 1, wherein the glass fiber has an average diameter of 8 to 11 μm.
4. The composite fiber modified PP material of claim 1, wherein the weight ratio of the collagen reinforcing fiber to the glass fiber is 1: (1.5-3).
5. The composite fiber-modified PP material according to claim 1, wherein the collagen-reinforced fiber has an isoelectric point of 6 to 8.
6. The composite fiber modified PP material of claim 1, wherein the PP resin has a weight average molecular weight of 9000 to 20000.
7. The composite fiber modified PP material of claim 1, wherein the PP resin has a melt flow rate of 5 to 50g/10min at 230 ℃ under 2.16 kg.
8. The composite fiber modified PP material according to claim 1, comprising at least one of the following features (a) to (c):
(a) The lubricant is an amide lubricant;
(b) The antioxidant comprises hindered phenol antioxidants and phosphite antioxidants;
(c) The compatilizer is maleic anhydride grafted polypropylene.
9. The method for preparing a composite fiber modified PP material according to any one of claims 1 to 8, comprising the steps of:
s1, mixing dried collagen-reinforced fibers, polysiloxane, part of PP resin and a lubricant to obtain a mixture A;
s2, mixing the mixture A, the rest of PP resin, the compatilizer and the antioxidant to obtain a mixture B;
s3, adding the mixture B to a main feeding port of an extruder, adding glass fibers to a side feeding port of the extruder, and performing melt mixing, extrusion and granulation to obtain the composite fiber modified PP material.
10. Use of the composite fiber modified PP material according to any one of claims 1-8 for preparing household appliances, toys.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211680601.2A CN116120661B (en) | 2022-12-27 | 2022-12-27 | Composite fiber modified PP material and preparation method and application thereof |
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