CN109910413B - PVC co-extruded sheet material and manufacturing method thereof - Google Patents
PVC co-extruded sheet material and manufacturing method thereof Download PDFInfo
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Abstract
The embodiment of the invention discloses a PVC co-extruded sheet material and a manufacturing method thereof, belonging to the technical field of composite materials, and comprising a PVC surface layer and a PVC foaming filling layer, wherein the PVC surface layer comprises PVC resin, CPVC powder, PBO fiber, a stabilizer, a flame retardant and heavy calcium carbonate powder; the PVC foaming filling layer comprises PVC resin, CPVC powder, PBO fibers, a stabilizer, a flame retardant, heavy calcium carbonate powder, an impact modifier, talcum powder, an internal wetting agent, oxidized polyethylene wax, magnesium oxide, a silane coupling agent, a foaming regulator, an ultraviolet absorbent, an antioxidant and an antistatic agent. The PVC co-extruded sheet material provided by the embodiment of the invention has good mechanical properties and weather resistance, overcomes the limitation of outdoor use of the existing PVC foaming material, greatly saves the cost of outdoor landscape engineering, further improves the use field of products, and has good popularization value.
Description
Technical Field
The embodiment of the invention relates to the technical field of composite materials, and particularly relates to a PVC co-extruded sheet material and a manufacturing method thereof.
Background
The panels are widely used in the building decoration industry and are often called building panels, wood panels, furniture panels, engineering boards, wood panels and the like. The board can be classified according to the material: solid wood boards and artificial boards are classified into two categories according to forming classification: solid panels, plywood, fiberboard, decorative panels, fire-proof panels, and the like. In the past, wood plates are used in large quantities, and along with the reduction of forest resources and the enhancement of environmental protection consciousness, the substitution of plastics for wood becomes the development direction of the plates in China.
The PVC foaming material is prepared by taking polyvinyl chloride (PVC) as a main raw material, matching with a foaming agent and other auxiliary agents, and performing processes such as plasticizing and compressing by an extruder. The PVC foaming material has the advantages of light weight, flame retardancy, no water absorption, corrosion resistance, insulation, good sound insulation and heat insulation performance and the like, and is widely applied to industries such as building materials, furniture, advertisements and the like.
The rigid PVC foam material which is industrially produced in the market at present is generally formed by single-item extrusion foaming, has the defects of insufficient toughness, easy fracture, high melting point and low bearing capacity, and simultaneously easily generates appearance defects such as spots, creases, welding marks and the like in the production process.
In view of the above, there is a need for improving the components of the existing PVC foam and the manufacturing method thereof.
Disclosure of Invention
Therefore, the embodiment of the invention provides a PVC co-extruded sheet and a manufacturing method thereof, and aims to solve the problems that the existing PVC foaming material is not high in strength, not enough in toughness, easy to crease and break and poor in weather resistance, so that the outdoor application requirement cannot be met.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
in a first aspect of the embodiment of the invention, the PVC co-extruded sheet material comprises a PVC surface layer and a PVC foaming filling layer,
the PVC surface layer is prepared from the following components in parts by weight: 35-40 parts of PVC resin, 9-12 parts of CPVC powder, 1-3 parts of PBO fiber, 1-2 parts of stabilizer, 2-3 parts of flame retardant and 12-15 parts of heavy calcium carbonate powder;
the PVC foaming filling layer is prepared from the following components in parts by weight: 110 parts of PVC resin 105-containing material, 30-40 parts of CPVC powder, 6-8 parts of PBO fiber, 3-5 parts of stabilizer, 5-6 parts of flame retardant, 40-60 parts of heavy calcium carbonate powder, 3-8 parts of impact modifier, 20-35 parts of talcum powder, 0.3-1.5 parts of internal lubricant, 0.3-0.5 part of oxidized polyethylene wax, 5-6 parts of magnesium oxide, 8-10 parts of silane coupling agent, 10-15 parts of foaming regulator, 0.2-0.5 part of ultraviolet absorbent, 0.2-0.3 part of antioxidant and 1-1.5 parts of antistatic agent.
Further, the PVC resin is of SG-6 type, has a K value of 65-63 and an average degree of polymerization of 950-850.
The CPVC powder is CORZAN CPVC, the molecular chlorine content of the CORZAN CPVC can be increased to 68-74% compared with 56.7% of basic PVC, the general CPVC is only about 63%, and the CORZAN CPVC has high temperature resistance, slow and inactive chemical property, excellent mechanical strength and safest fuming property for anti-flaming.
The PBO fiber is also called poly-p-phenylene benzobisoxazole fiber, has higher strength (5.8GPa), the modulus of the PBO fiber is usually 280GPa, the modulus of the PBO fiber is the largest in various fibers, and the PBO fiber can bear high temperature of 600 ℃ and has the limited oxygen index of about 68, so that the PBO fiber can not burn and shrink in flame.
The stabilizer is a rare earth stabilizer, and the rare earth stabilizer is synthesized by taking carboxylate or fatty acid salt of rare earth elements as a main component. The rare earth elements can absorb 230-320nm ultraviolet light, so the rare earth stabilizer has the effect of resisting light aging.
The flame retardant is UN3077 flame retardant from Tosoh corporation of Japan, and completely meets the requirements of ROHS, REACH and phthalate.
The particle size of the heavy calcium carbonate powder is 1250 meshes, the whiteness is unchanged after high-temperature heating, the stability of the plate is improved, and the hardness, the flatness and the smoothness of the plate are improved.
The impact modifier is methyl methacrylate-butadiene-styrene copolymer, the mechanical property of the impact modifier is far better than that of low-density polyethylene, and the impact resistance of PVC can be well improved.
The talcum powder is plastic grade talcum powder, and the talcum powder is beneficial to improving the mechanical property of the PVC material after foaming.
The internal wetting agent is LOXIOL GH4 internal wetting agent of Germany corning company, has good compatibility with PVC, and plays a role of reducing intermolecular cohesion in the internal wetting agent, thereby improving the internal friction heat generation of PVC melt and the fluidity of the melt.
The oxidized polyethylene wax is high-density oxidized polyethylene wax, has high crystallinity, non-polar surface with a certain degree of translucence, good heat resistance and cold resistance, good chemical stability, higher rigidity and toughness and good mechanical strength.
The magnesium oxide is light magnesium oxide, is light and loose in volume, is white amorphous powder, and is odorless, tasteless and nontoxic.
The silane coupling agent is KH-550, has better compatibility with PVC in the adhesive, and can form a uniform surface on the surface of an adherend, thereby having better bonding effect.
The foaming regulator is a JINHASS foaming regulator, and can remarkably improve the pressure and the torque of the PVC melt, thereby effectively increasing the cohesion and the homogeneity of the PVC melt and enabling the obtained PVC product to be more compact.
The ultraviolet absorbent is 744 type light stabilizer, the 744 type light stabilizer is hindered type light stabilizer, the ultraviolet absorbent has almost no ultraviolet absorption capability, and can effectively capture active free radicals generated by high molecular materials under the action of ultraviolet rays, thereby exerting the light stabilization effect, the light resistance is several times of that of common ultraviolet absorbents, the ultraviolet absorbent is not colored and polluted, the heat resistance processability is good, the ultraviolet absorbent is used together with an antioxidant and the ultraviolet absorbent, the synergistic effect is good, and the ultraviolet absorbent can well absorb the ultraviolet rays with the wavelength of 300-380 nm.
The antioxidant is a TNP type antioxidant and is mainly characterized by no odor, no toxicity, insolubility in water and high oxidation resistance at high temperature.
The antistatic agent is British grass big Atmer 129, is prepared into antistatic master batch in advance during processing, and is mixed with blank PVC to process a product, so that the uniformity is better, and the effect is better.
The PVC co-extruded sheet comprises toner, wherein the PVC surface layer also comprises 3-5 parts by weight of toner; the PVC foaming filling layer also comprises 15-25 parts by weight of toner.
In a second aspect of the embodiment of the present invention, there is provided a method for manufacturing the PVC co-extruded sheet, including the following steps:
(I) preparing PVC surface layer material
Preparing the components according to the weight ratio, uniformly mixing PVC resin, CPVC powder, PBO fiber, a stabilizer, a flame retardant and heavy calcium carbonate powder, heating to 190 ℃ with 180 ℃, stirring for 3-6min, slowly cooling to 30-40 ℃, pouring into a sieving device, and removing materials on the sieve to obtain a PVC surface layer screening material;
(II) preparing PVC foaming filling layer material
1) Preparing the components according to the weight ratio, uniformly mixing PVC resin, CPVC powder, PBO fiber, a stabilizer, a flame retardant and heavy calcium carbonate powder, stirring and heating, adding an impact modifier when the temperature is increased to 75-80 ℃, continuously stirring and heating, setting the rotating speed of a stirrer to 1600-1800 rpm when the temperature is increased to 105-110 ℃, stirring for 18-25 minutes, setting the rotating speed of the stirrer to 70-90 rpm, adding talcum powder, mixing and stirring, and heating to 115-125 ℃;
2) setting the temperature of the stirrer to be 35-40 ℃, and gradually cooling the mixed material in the step 1) to 35-40 ℃;
3) adding an internal wetting agent, oxidized polyethylene wax and magnesium oxide, uniformly stirring, and heating to 50-60 ℃ to completely fuse the mixed materials;
4) continuously stirring, adding the silane coupling agent, and not needing to be added too fast in the whole adding process;
5) adding a foaming regulator, an ultraviolet absorbent, an antioxidant and an antistatic agent into a stirrer, heating to 115-125 ℃, continuing stirring for 8-12min, and slowly cooling to 30-40 ℃;
6) pouring the mixed material obtained in the step 5) into a sieving device, and removing oversize materials to obtain a PVC foamed filling layer screening material;
(III) preparing PVC co-extruded sheet
1) Respectively adding a PVC surface layer screening material and a PVC foaming filling layer screening material into a PVC surface layer extruder and a PVC foaming filling layer extruder, wherein the temperature for co-extrusion of the PVC surface layer extruder is set to be 190 ℃ plus one material, and the temperature of the PVC foaming filling layer extruder is set to be 220 ℃ plus one material;
2) the materials extruded by the PVC surface layer extruder and the PVC foaming filling layer extruder are distributed into a die through a distributor, and the die is cooled, shaped and then pressed by a press to form wood textures;
3) taking the plate out of the die after cooling, putting the plate into a grooving device, selecting a grooving shape for grooving, and opening a U-shaped groove, an L-shaped groove, a T-shaped groove or a linear groove according to a customization requirement, wherein each groove is provided with a corresponding buckle for fixing;
4) and the plate is further processed into arc-shaped and S-shaped profiles according to the customized radian after being formed through high-temperature secondary profile processing.
Further, when the PVC co-extruded sheet material comprises toner,
(I) preparing PVC surface layer material
Preparing the components according to the weight ratio, uniformly mixing PVC resin, CPVC powder, PBO fiber, a stabilizer, a flame retardant and heavy calcium carbonate powder, heating to 190 ℃ with 180 ℃, adding the toner, continuously stirring for 8-12min, slowly cooling to 30-40 ℃, pouring into a sieving device, and removing materials on the sieve to obtain a PVC surface layer screening material;
(II) preparing PVC foaming filling layer material
5) Adding foaming regulator, ultraviolet absorbent, antioxidant, antistatic agent and toner into a stirrer, heating to 115-125 deg.C, stirring for 8-12min, and slowly cooling to 30-40 deg.C.
Furthermore, the sieving particle size of the sieving device is less than or equal to 180 mu m.
The embodiment of the invention has the following advantages:
the PVC co-extruded sheet material provided by the embodiment of the invention takes PVC resin, CPVC powder, PBO fibers, a stabilizer, a flame retardant, heavy calcium carbonate powder, an impact modifier, talcum powder, an internal lubricant, oxidized polyethylene wax, magnesium oxide, a silane coupling agent, a foaming regulator, an ultraviolet absorbent, an antioxidant and an antistatic agent as raw materials, and through the optimization of component substances and the mutual matching of the PVC resin, the CPVC powder, the PBO fibers, the stabilizer, the oxidized polyethylene wax and the ultraviolet absorbent, the strength of the PVC co-extruded sheet material is enhanced, the weather resistance of the PVC co-extruded sheet material is also obviously improved, and the requirements of outdoor implementation and application are greatly met.
The PVC co-extruded sheet prepared by the embodiment of the invention has the advantages of small linear expansion coefficient, strong nail-holding power, good dimensional stability, low water absorption, low heat conductivity coefficient, good load resistance, difficult deformation and bending and good mechanical property. Meanwhile, the aging performance test shows that the PVC co-extruded sheet has small color change, which shows that the weather resistance is good. The PVC co-extruded sheet material disclosed by the embodiment of the invention overcomes the limitation of outdoor use of the existing PVC foaming material, greatly saves the cost of outdoor landscape engineering, further improves the use field of products, and has good popularization value.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. 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 invention.
This section generally describes the materials used in the testing of the present invention, as well as the testing methods. Although many materials and methods of operation are known in the art for the purpose of carrying out the invention, the invention is nevertheless described herein in as detail as possible. It will be apparent to those skilled in the art that the materials and methods of operation used in the present invention are well within the skill of the art, provided that they are not specifically illustrated. The parts in the following examples are by weight unless otherwise specified.
In the following examples, the PVC resin was of the SG-6 type, the K value thereof was 65 to 63, and the average degree of polymerization was 950-850; the CPVC powder is CORZAN CPVC; the stabilizer is a rare earth stabilizer; the flame retardant is UN3077 flame retardant from Tosoh corporation of Japan; the grain size of the heavy calcium carbonate powder is 1250 meshes; the impact modifier is methyl methacrylate-butadiene-styrene copolymer; the talcum powder is plastic grade talcum powder; the internal lubricant is LOXIOL GH4 internal lubricant of Germany corning company; the oxidized polyethylene wax is high-density oxidized polyethylene wax; the magnesium oxide is light magnesium oxide; the silane coupling agent is KH-550; the foaming regulator is JINHASS foaming regulator; the ultraviolet absorbent is 744 type light stabilizer; the antioxidant is TNP type antioxidant; the antistatic agent is British Poa large Atmer 129.
Example 1
The manufacturing method of the PVC co-extruded sheet material comprises the following steps:
(I) preparing PVC surface layer material
Uniformly mixing 38 parts of PVC resin, 12 parts of CPVC powder, 1.5 parts of PBO fiber, 1.5 parts of stabilizer, 2 parts of flame retardant and 15 parts of heavy calcium carbonate powder, heating to 180 ℃, adding 3 parts of toner, continuously stirring for 10min, slowly cooling to 35 ℃, pouring into a sieving device with the sieving particle size of 180 mu m, and removing oversize materials to obtain a PVC surface layer screening material;
(II) preparing PVC foaming filling layer material
1) Uniformly mixing 110 parts of PVC resin, 30 parts of CPVC powder, 7 parts of PBO fiber, 3.8 parts of stabilizer, 5.7 parts of flame retardant and 42 parts of heavy calcium carbonate powder, stirring and heating, adding 8 parts of impact modifier when the temperature is increased to 75 ℃, continuously stirring and heating, setting the rotation speed of a stirrer to 1800 rpm when the temperature is increased to 105 ℃, stirring for 20 minutes, setting the rotation speed of the stirrer to 80 rpm, adding 28 parts of talcum powder, mixing and stirring, and heating to 120 ℃;
2) setting the temperature of the stirrer to 35 ℃, and gradually cooling the mixed material in the step 1) to 35 ℃;
3) adding 1.1 parts of internal wetting agent, 0.32 parts of oxidized polyethylene wax and 5.8 parts of magnesium oxide, uniformly stirring, and heating to 55 ℃ to completely fuse the mixed materials;
4) continuously stirring, and adding 10 parts of silane coupling agent, wherein the whole adding process is not too fast;
5) adding 12 parts of foaming regulator, 0.25 part of ultraviolet absorber, 0.24 part of antioxidant, 1.5 parts of antistatic agent and 18 parts of toner into a stirrer, heating to 120 ℃, continuing stirring for 10min, and slowly cooling to 35 ℃;
6) pouring the mixed material obtained in the step 5) into a sieving device, and removing oversize materials to obtain a PVC foamed filling layer screening material;
(III) preparing PVC co-extruded sheet
1) Respectively adding a PVC surface layer screening material and a PVC foaming filling layer screening material into a PVC surface layer extruder and a PVC foaming filling layer extruder, wherein the co-extrusion temperature of the PVC surface layer extruder is set to 180 ℃, and the temperature of the PVC foaming filling layer extruder is set to 200 ℃;
2) the materials extruded by the PVC surface layer extruder and the PVC foaming filling layer extruder are distributed into a die through a distributor, and the die is cooled, shaped and then pressed by a press to form wood textures;
3) taking the plate out of the die after cooling, putting the plate into a grooving device, selecting a grooving shape for grooving, and opening a U-shaped groove, an L-shaped groove, a T-shaped groove or a linear groove according to a customization requirement, wherein each groove is provided with a corresponding buckle for fixing;
4) and the plate is further processed into arc-shaped and S-shaped profiles according to the customized radian after being formed through high-temperature secondary profile processing.
Example 2
The manufacturing method of the PVC co-extruded sheet material comprises the following steps:
(I) preparing PVC surface layer material
Uniformly mixing 35 parts of PVC resin, 9 parts of CPVC powder, 1 part of PBO fiber, 2 parts of stabilizer, 3 parts of flame retardant and 13 parts of heavy calcium carbonate powder, heating to 185 ℃, adding 3.5 parts of toner, continuously stirring for 8min, slowly cooling to 45 ℃, pouring into a sieving device with a sieving particle size of 160 mu m, and removing oversize materials to obtain a PVC surface layer screening material;
(II) preparing PVC foaming filling layer material
1) Uniformly mixing 108 parts of PVC resin, 35 parts of CPVC powder, 7.5 parts of PBO fiber, 4 parts of stabilizer, 5.5 parts of flame retardant and 50 parts of heavy calcium carbonate powder, stirring and heating, adding 6 parts of impact modifier when the temperature is increased to 80 ℃, continuously stirring and heating, setting the rotation speed of a stirrer to 1600 revolutions per minute when the temperature is increased to 110 ℃, stirring for 22 minutes, setting the rotation speed of the stirrer to 90 revolutions per minute, adding 28 parts of talcum powder, mixing and stirring, and heating to 115 ℃;
2) setting the temperature of the stirrer to be 40 ℃, and gradually cooling the mixed material in the step 1) to 40 ℃;
3) adding 0.8 part of internal wetting agent, 0.4 part of oxidized polyethylene wax and 5.5 parts of magnesium oxide, uniformly stirring, and heating to 50 ℃ to completely fuse the mixed materials;
4) continuously stirring, and adding 8.5 parts of silane coupling agent, wherein the whole adding process is not too fast;
5) adding 12 parts of foaming regulator, 0.3 part of ultraviolet absorber, 0.25 part of antioxidant, 1.2 parts of antistatic agent and 20 parts of toner into a stirrer, heating to 115 ℃, continuing stirring for 12min, and slowly cooling to 35 ℃;
6) pouring the mixed material obtained in the step 5) into a sieving device, and removing oversize materials to obtain a PVC foamed filling layer screening material;
(III) preparing PVC co-extruded sheet
1) Respectively adding a PVC surface layer screening material and a PVC foaming filling layer screening material into a PVC surface layer extruder and a PVC foaming filling layer extruder, wherein the co-extrusion temperature of the PVC surface layer extruder is set to 190 ℃, and the temperature of the PVC foaming filling layer extruder is set to 210 ℃;
2) the materials extruded by the PVC surface layer extruder and the PVC foaming filling layer extruder are distributed into a die through a distributor, and the die is cooled, shaped and then pressed by a press to form wood textures;
3) taking the plate out of the die after cooling, putting the plate into a grooving device, selecting a grooving shape for grooving, and opening a U-shaped groove, an L-shaped groove, a T-shaped groove or a linear groove according to a customization requirement, wherein each groove is provided with a corresponding buckle for fixing;
4) and the plate is further processed into arc-shaped and S-shaped profiles according to the customized radian after being formed through high-temperature secondary profile processing.
Example 3
The manufacturing method of the PVC co-extruded sheet material comprises the following steps:
(I) preparing PVC surface layer material
Uniformly mixing 35 parts of PVC resin, 10 parts of CPVC powder, 2 parts of PBO fiber, 1.4 parts of stabilizer, 2.4 parts of flame retardant and 13.5 parts of heavy calcium carbonate powder, heating to 190 ℃, adding 4 parts of toner, continuously stirring for 8min, slowly cooling to 40 ℃, pouring into a sieving device with the sieving particle size of 160 mu m, and removing oversize materials to obtain a PVC surface layer screening material;
(II) preparing PVC foaming filling layer material
1) Uniformly mixing 105 parts of PVC resin, 36 parts of CPVC powder, 6.5 parts of PBO fibers, 3.2 parts of a stabilizer, 6 parts of a flame retardant and 48 parts of heavy calcium carbonate powder, stirring and heating, adding 6.5 parts of an impact modifier when the temperature is increased to 80 ℃, continuously stirring and heating, setting the rotation speed of a stirrer to 1800 rpm when the temperature is increased to 110 ℃, stirring for 20 minutes, setting the rotation speed of the stirrer to 80 rpm, adding 30 parts of talcum powder, mixing and stirring, and heating to 125 ℃;
2) setting the temperature of the stirrer to 35 ℃, and gradually cooling the mixed material in the step 1) to 35 ℃;
3) adding 0.3 part of internal wetting agent, 0.38 part of oxidized polyethylene wax and 6 parts of magnesium oxide, uniformly stirring, and heating to 50 ℃ to completely fuse the mixed materials;
4) continuously stirring, and adding 8.8 parts of silane coupling agent, wherein the whole adding process is not too fast;
5) adding 10 parts of foaming regulator, 0.32 part of ultraviolet absorber, 0.29 part of antioxidant, 1.2 parts of antistatic agent and 22 parts of toner into a stirrer, heating to 115 ℃, continuing stirring for 12min, and slowly cooling to 40 ℃;
6) pouring the mixed material obtained in the step 5) into a sieving device, and removing oversize materials to obtain a PVC foamed filling layer screening material;
(III) preparing PVC co-extruded sheet
1) Respectively adding a PVC surface layer screening material and a PVC foaming filling layer screening material into a PVC surface layer extruder and a PVC foaming filling layer extruder, wherein the co-extrusion temperature of the PVC surface layer extruder is set to 190 ℃, and the temperature of the PVC foaming filling layer extruder is set to 215 ℃;
2) the materials extruded by the PVC surface layer extruder and the PVC foaming filling layer extruder are distributed into a die through a distributor, and the die is cooled, shaped and then pressed by a press to form wood textures;
3) taking the plate out of the die after cooling, putting the plate into a grooving device, selecting a grooving shape for grooving, and opening a U-shaped groove, an L-shaped groove, a T-shaped groove or a linear groove according to a customization requirement, wherein each groove is provided with a corresponding buckle for fixing;
4) and the plate is further processed into arc-shaped and S-shaped profiles according to the customized radian after being formed through high-temperature secondary profile processing.
Example 4
The manufacturing method of the PVC co-extruded sheet material comprises the following steps:
(I) preparing PVC surface layer material
Uniformly mixing 40 parts of PVC resin, 11.5 parts of CPVC powder, 1 part of PBO fiber, 1.6 parts of stabilizer, 2.6 parts of flame retardant and 14 parts of heavy calcium carbonate powder, heating to 185 ℃, adding 4 parts of toner, continuously stirring for 12min, slowly cooling to 45 ℃, pouring into a sieving device with the sieving particle size of 180 mu m, and removing materials on the sieve to obtain a PVC surface layer screening material;
(II) preparing PVC foaming filling layer material
1) Uniformly mixing 110 parts of PVC resin, 32 parts of CPVC powder, 7.8 parts of PBO fiber, 4.5 parts of stabilizer, 5 parts of flame retardant and 58 parts of heavy calcium carbonate powder, stirring and heating, adding 4.2 parts of impact modifier when the temperature is increased to 75 ℃, continuously stirring and heating, setting the rotation speed of a stirrer to 1600 revolutions per minute when the temperature is increased to 110 ℃, stirring for 18 minutes, setting the rotation speed of the stirrer to 70 revolutions per minute, adding 22 parts of talcum powder, mixing and stirring, and heating to 125 ℃;
2) setting the temperature of the stirrer to be 40 ℃, and gradually cooling the mixed material in the step 1) to 40 ℃;
3) adding 1.4 parts of internal wetting agent, 0.45 part of oxidized polyethylene wax and 5.5 parts of magnesium oxide, uniformly stirring, and heating to 55 ℃ to completely fuse the mixed materials;
4) continuously stirring, and adding 8.2 parts of silane coupling agent, wherein the whole adding process is not too fast;
5) adding 14 parts of foaming regulator, 0.5 part of ultraviolet absorber, 0.2 part of antioxidant, 1 part of antistatic agent and 25 parts of toner into a stirrer, heating to 120 ℃, continuing stirring for 10min, and slowly cooling to 40 ℃;
6) pouring the mixed material obtained in the step 5) into a sieving device, and removing oversize materials to obtain a PVC foamed filling layer screening material;
(III) preparing PVC co-extruded sheet
1) Respectively adding a PVC surface layer screening material and a PVC foaming filling layer screening material into a PVC surface layer extruder and a PVC foaming filling layer extruder, wherein the co-extrusion temperature of the PVC surface layer extruder is set to 190 ℃, and the temperature of the PVC foaming filling layer extruder is set to 220 ℃;
2) the materials extruded by the PVC surface layer extruder and the PVC foaming filling layer extruder are distributed into a die through a distributor, and the die is cooled, shaped and then pressed by a press to form wood textures;
3) taking the plate out of the die after cooling, putting the plate into a grooving device, selecting a grooving shape for grooving, and opening a U-shaped groove, an L-shaped groove, a T-shaped groove or a linear groove according to a customization requirement, wherein each groove is provided with a corresponding buckle for fixing;
4) and the plate is further processed into arc-shaped and S-shaped profiles according to the customized radian after being formed through high-temperature secondary profile processing.
Example 5
The manufacturing method of the PVC co-extruded sheet material comprises the following steps:
(I) preparing PVC surface layer material
Uniformly mixing 39 parts of PVC resin, 11.5 parts of CPVC powder, 2.2 parts of PBO fiber, 1.8 parts of stabilizer, 2.8 parts of flame retardant and 14.5 parts of heavy calcium carbonate powder, heating to 185 ℃, adding 4.5 parts of toner, continuously stirring for 10min, slowly cooling to 45 ℃, pouring into a sieving device with the sieving particle size of 180 mu m, and removing oversize materials to obtain a PVC surface layer screening material;
(II) preparing PVC foaming filling layer material
1) Uniformly mixing 108 parts of PVC resin, 39 parts of CPVC powder, 6.8 parts of PBO fiber, 4.8 parts of stabilizer, 5.3 parts of flame retardant and 52 parts of heavy calcium carbonate powder, stirring and heating, adding 3 parts of impact modifier when the temperature is increased to 80 ℃, continuously stirring and heating, setting the rotation speed of a stirrer to 1800 rpm when the temperature is increased to 110 ℃, stirring for 22 minutes, setting the rotation speed of the stirrer to 80 rpm, adding 35 parts of talcum powder, mixing and stirring, and heating to 115 ℃;
2) setting the temperature of the stirrer to 35 ℃, and gradually cooling the mixed material in the step 1) to 35 ℃;
3) adding 0.7 part of internal wetting agent, 0.48 part of oxidized polyethylene wax and 5.2 parts of magnesium oxide, uniformly stirring, and heating to 60 ℃ to completely fuse the mixed materials;
4) continuously stirring, and adding 9.2 parts of silane coupling agent, wherein the whole adding process is not too fast;
5) adding 15 parts of foaming regulator, 0.45 part of ultraviolet absorber, 0.26 part of antioxidant, 1.3 parts of antistatic agent and 15 parts of toner into a stirrer, heating to 115 ℃, continuing stirring for 10min, and slowly cooling to 40 ℃;
6) pouring the mixed material obtained in the step 5) into a sieving device, and removing oversize materials to obtain a PVC foamed filling layer screening material;
(III) preparing PVC co-extruded sheet
1) Respectively adding a PVC surface layer screening material and a PVC foaming filling layer screening material into a PVC surface layer extruder and a PVC foaming filling layer extruder, wherein the co-extrusion temperature of the PVC surface layer extruder is set to 185 ℃, and the temperature of the PVC foaming filling layer extruder is set to 210 ℃;
2) the materials extruded by the PVC surface layer extruder and the PVC foaming filling layer extruder are distributed into a die through a distributor, and the die is cooled, shaped and then pressed by a press to form wood textures;
3) taking the plate out of the die after cooling, putting the plate into a grooving device, selecting a grooving shape for grooving, and opening a U-shaped groove, an L-shaped groove, a T-shaped groove or a linear groove according to a customization requirement, wherein each groove is provided with a corresponding buckle for fixing;
4) and the plate is further processed into arc-shaped and S-shaped profiles according to the customized radian after being formed through high-temperature secondary profile processing.
Comparative example 1
The manufacturing method of the PVC co-extruded sheet material of the comparative example is different from that of the example 1 only in that the PBO fiber is replaced by the carbon fiber with the same quantity.
Comparative example 2
The manufacturing method of the PVC co-extruded sheet material of the comparative example is different from that of the example 1 only in that the rare earth stabilizer is replaced by the same amount of calcium-zinc stabilizer.
Test example
The linear expansion coefficient, the water absorption rate, the thermal conductivity coefficient, the tensile strength, the breaking tensile strain, the bending strength, the unnotched impact strength of the simple supported beam and the nail-gripping force of the PVC co-extruded sheets prepared in the examples 1 to 5 and the comparative examples 1 to 2 and the existing PVC sheets are tested by respectively referring to GB/T1036-2008, GB/T1034-2008, GB/T10297-1998, GB/T1040.2-2006, GB/T9341-2008, GB/T1043.1-2008 and LY/T1063-2004, and the test results are shown in Table 1.
TABLE 1
The results show that: compared with comparative examples 1-2 and the existing PVC material, the PVC co-extruded sheet prepared in the embodiment of the invention has the advantages of smaller linear expansion coefficient, water absorption rate and heat conductivity coefficient, larger nail-holding power, better mechanical indexes of tensile strength, breaking tensile strain, bending strength and unnotched impact strength of the simply supported beam, and better weather resistance.
And (3) aging performance test: the xenon lamp artificial weathering test is carried out according to GB/T16422.2-1999, and the test conditions are as follows: water-cooled xenon lamp (6.6kW), irradiationDegree (340nm) of 0.5W/m2Black standard temperature (65 +/-3) DEG C, relative humidity (65 +/-5)%, rainfall period 18min/102min (water spraying/non-water spraying period time) and aging time 4000 h. The color changes of the PVC foamed filling layer of the PVC co-extruded sheet prepared in the examples 1-5 and the comparative examples 1-2 and the existing foamed filling layer before and after 4000h aging are shown in the test result in Table 2.
TABLE 2
Note: l value indicates lightness (brightness) of a color, a value indicates a green-red value of a color, and b value indicates a blue-yellow value of a color; l ', a ', b ' are values after aging; Δ b ═ b-b'; Δ E { (. DELTA.L)2+(△a)2+(△ b)2}1/2。
The results show that: compared with comparative examples 1-2 and the existing foaming filling layer, the PVC foaming filling layer provided by the embodiment of the invention has smaller color change before and after an aging test, can effectively resist high-temperature dechlorination of chlorinated polyethylene caused by ultraviolet irradiation, avoids the problems of degradation, aging and fading, greatly improves the thermal stability of the co-extruded sheet, and has excellent weather resistance.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (2)
1. The PVC co-extruded sheet is characterized by comprising a PVC surface layer and a PVC foaming filling layer, wherein the PVC surface layer is prepared from the following components in parts by weight: 35-40 parts of PVC resin, 9-12 parts of CPVC powder, 1-3 parts of PBO fiber, 1-2 parts of stabilizer, 2-3 parts of flame retardant and 12-15 parts of heavy calcium carbonate powder;
the PVC foaming filling layer is prepared from the following components in parts by weight: 110 parts of PVC resin 105-containing material, 30-40 parts of CPVC powder, 6-8 parts of PBO fiber, 3-5 parts of stabilizer, 5-6 parts of flame retardant, 40-60 parts of heavy calcium carbonate powder, 3-8 parts of impact modifier, 20-35 parts of talcum powder, 0.3-1.5 parts of internal lubricant, 0.3-0.5 part of oxidized polyethylene wax, 5-6 parts of magnesium oxide, 8-10 parts of silane coupling agent, 10-15 parts of foaming regulator, 0.2-0.5 part of ultraviolet absorbent, 0.2-0.3 part of antioxidant and 1-1.5 parts of antistatic agent;
the PVC resin is SG-6 type, the K value is 65-63, and the average polymerization degree is 950-850; the CPVC powder is CORZAN CPVC; the stabilizer is a rare earth stabilizer; the flame retardant is UN3077 flame retardant from Tosoh corporation of Japan; the particle size of the heavy calcium carbonate powder is 1250 meshes; the impact modifier is methyl methacrylate-butadiene-styrene copolymer; the talcum powder is plastic grade talcum powder; the internal wetting agent is LOXIOL GH4 internal wetting agent of Germany corning company; the oxidized polyethylene wax is high-density oxidized polyethylene wax; the magnesium oxide is light magnesium oxide; the silane coupling agent is KH-550; the foaming regulator is a JINHASS foaming regulator; the ultraviolet absorbent is 744 type light stabilizer; the antioxidant is a TNP type antioxidant; the antistatic agent is British Poa large Atmer 129;
the manufacturing method of the PVC co-extruded sheet material comprises the following steps: (I) preparing PVC surface layer material
Preparing the components according to the weight ratio, uniformly mixing PVC resin, CPVC powder, PBO fiber, a stabilizer, a flame retardant and heavy calcium carbonate powder, heating to 190 ℃ with 180 ℃, stirring for 3-6min, slowly cooling to 30-40 ℃, pouring into a sieving device, and removing materials on the sieve to obtain a PVC surface layer screening material;
(II) preparing PVC foaming filling layer material
1) Preparing the components according to the weight ratio, uniformly mixing PVC resin, CPVC powder, PBO fiber, a stabilizer, a flame retardant and heavy calcium carbonate powder, stirring and heating, adding an impact modifier when the temperature is increased to 75-80 ℃, continuously stirring and heating, setting the rotating speed of a stirrer to 1600-1800 rpm when the temperature is increased to 105-110 ℃, stirring for 18-25 minutes, setting the rotating speed of the stirrer to 70-90 rpm, adding talcum powder, mixing and stirring, and heating to 115-125 ℃;
2) setting the temperature of the stirrer to be 35-40 ℃, and gradually cooling the mixed material in the step 1) to 35-40 ℃;
3) adding an internal wetting agent, oxidized polyethylene wax and magnesium oxide, uniformly stirring, and heating to 50-60 ℃ to completely fuse the mixed materials;
4) continuously stirring, adding the silane coupling agent, and not needing to be added too fast in the whole adding process;
5) adding a foaming regulator, an ultraviolet absorbent, an antioxidant and an antistatic agent into a stirrer, heating to 115-125 ℃, continuing stirring for 8-12min, and slowly cooling to 30-40 ℃;
6) pouring the mixed material obtained in the step 5) into a sieving device, and removing oversize materials to obtain a PVC foamed filling layer screening material;
(III) preparing PVC co-extruded sheet
1) Respectively adding a PVC surface layer screening material and a PVC foaming filling layer screening material into a PVC surface layer extruder and a PVC foaming filling layer extruder, wherein the temperature for co-extrusion of the PVC surface layer extruder is set to be 190 ℃ plus one material, and the temperature of the PVC foaming filling layer extruder is set to be 220 ℃ plus one material;
2) the materials extruded by the PVC surface layer extruder and the PVC foaming filling layer extruder are distributed into a die through a distributor, and the die is cooled, shaped and then pressed by a press to form wood textures;
3) taking the plate out of the die after cooling, putting the plate into a grooving device, selecting a grooving shape for grooving, and opening a U-shaped groove, an L-shaped groove, a T-shaped groove or a linear groove according to a customization requirement, wherein each groove is provided with a corresponding buckle for fixing;
4) and the plate is further processed into arc-shaped and S-shaped profiles according to the customized radian after being formed through high-temperature secondary profile processing.
2. The PVC co-extruded sheet according to claim 1, wherein the PVC co-extruded sheet comprises toner, wherein the PVC facing layer further comprises 3-5 parts by weight of toner; the PVC foaming filling layer also comprises 15-25 parts by weight of toner;
when the PVC co-extruded sheet comprises toner, (I) PVC surface layer material is prepared
Preparing the components according to the weight ratio, uniformly mixing PVC resin, CPVC powder, PBO fiber, a stabilizer, a flame retardant and heavy calcium carbonate powder, heating to 190 ℃ with 180 ℃, adding the toner, continuously stirring for 8-12min, slowly cooling to 30-40 ℃, pouring into a sieving device, and removing materials on the sieve to obtain a PVC surface layer screening material;
(II) preparing PVC foaming filling layer material
Adding foaming regulator, ultraviolet absorbent, antioxidant, antistatic agent and toner into a stirrer, heating to 115-125 deg.C, stirring for 8-12min, and slowly cooling to 30-40 deg.C;
the sieving particle size of the sieving device is less than or equal to 180 mu m.
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