Method for preparing PVC honeycomb core by using PVC thin-wall small-caliber pipe and product

Abstract

The invention discloses a method for preparing a PVC honeycomb core by using a PVC thin-wall small-caliber pipe and a product, and belongs to the technical field of polymer forming processing. The method comprises the steps that a high-strength and high-toughness PVC thin-wall and small-caliber pipe is produced firstly, then the PVC honeycomb core is produced through the PVC thin-wall and small-caliber pipe, the PVC thin-wall and small-caliber pipe contains polyvinyl chloride, and the polyvinyl chloride is ethylene method SG-7 or SG-8 type resin powder. The PVC honeycomb core has the advantages of stable structure, high dimensional stability, high strength, good toughness and flame retardance.

Description

Technical Field

[0001] The invention relates to the technical field of polymer molding and processing, and in particular to a method for preparing a PVC honeycomb core by utilizing PVC thin-walled small-diameter pipes and a product thereof. Background Art

[0002] At present, honeycomb core is widely used in our lives as a lightweight filling material. Common ones include paper honeycomb core, PP honeycomb core, aluminum honeycomb core, etc. They are widely used in indoor and outdoor decorative panels, furniture panels, automotive fields, etc. At the same time, they also have some disadvantages. Paper honeycomb core is not waterproof, flame retardant, and formaldehyde exceeds the standard. PP honeycomb core is not flame retardant and has insufficient rigidity. Aluminum honeycomb core has thin honeycomb wall, poor strength and bonding, easy to delaminate and bubble. PVC material has excellent flame retardant properties, high strength and low price. Only after proper modification can the PVC honeycomb core be processed with excellent comprehensive performance and cost performance. Summary of the invention

[0003] In view of the problems existing in the prior art, one technical problem to be solved by the present invention is to provide a method for preparing a PVC honeycomb core by using a PVC thin-walled small-diameter pipe, firstly producing a high-strength and high-toughness PVC thin-walled small-diameter pipe, and then using the PVC thin-walled small-diameter pipe to produce a PVC honeycomb core. Another technical problem to be solved by the present invention is to provide a PVC honeycomb core having the advantages of stable structure and high strength.

[0004] In order to solve the above problems, the technical solution adopted by the present invention is as follows:

[0005] A method for preparing a PVC honeycomb core by using a PVC thin-walled small-diameter pipe. The components of the PVC thin-walled small-diameter pipe contain polyvinyl chloride, which is ethylene-process SG-7 or SG-8 type resin powder with an average polymerization degree of 650-850.

[0006] The method for preparing a PVC honeycomb core by using a PVC thin-walled small-diameter pipe, wherein the components of the PVC thin-walled small-diameter pipe also include an environmentally friendly plasticizer, an environmentally friendly stabilizer, an inorganic filler, a lubricant, a toughening agent, and a processing aid; the weight proportions of the components are: 100 parts of polyvinyl chloride, 0-10 parts of environmentally friendly plasticizer, 2-5 parts of environmentally friendly stabilizer, 0-10 parts of inorganic filler, 0.3-1.5 parts of lubricant, 3-10 parts of toughening agent, and 1-5 parts of processing aid.

[0007] The method for preparing a PVC honeycomb core by using a PVC thin-walled small-diameter pipe comprises the following components by weight: 100 parts of polyvinyl chloride, 0 to 5 parts of an environmentally friendly plasticizer, 3 to 4 parts of an environmentally friendly stabilizer, 0 to 5 parts of an inorganic filler, 0.3 to 0.7 parts of a lubricant, 3 to 6 parts of a toughening agent, and 1 to 3 parts of a processing aid.

[0008] The method for preparing a PVC honeycomb core by using a PVC thin-walled small-diameter pipe, the environmentally friendly plasticizer is one or more of DOTP (dioctyl terephthalate), DOA (dioctyl adipate), DOS (diisooctyl sebacate), and DOZ (dioctyl azelaic acid); the environmentally friendly stabilizer is a non-toxic transparent stabilizer, one or more of a calcium zinc stabilizer, a barium zinc stabilizer, and a calcium barium zinc stabilizer; the inorganic filler is calcium carbonate, talcum powder, wollastonite, and calcium sulfate whiskers, with a mesh size of 1000 to 2500 meshes; the lubricant is one or more of monoglyceride, stearic acid, polyethylene wax, and ethylene oxide wax; the toughening agent is one or more of ACR (acrylates), MBS (methyl methacrylate-butadiene-styrene copolymer), and CPE (chlorinated polyethylene); and the processing aid is one or more of ACR and SAN (styrene acrylonitrile) processing aids.

[0009] The method for preparing a PVC honeycomb core by using a PVC thin-walled small-diameter pipe is characterized in that the polyvinyl chloride is ethylene-process SG-7 resin powder with an average polymerization degree of 700-800; the environmentally friendly plasticizer is DOTP; and the environmentally friendly stabilizer is a calcium zinc stabilizer.

[0010] The method for preparing a PVC honeycomb core using a PVC thin-walled small-diameter pipe comprises the following steps: coating the outer surface of the PVC thin-walled small-diameter pipe with a layer of hot-melt adhesive; after the hot-melt adhesive is cooled and solidified, laying the PVC thin-walled small-diameter pipe coated with the hot-melt adhesive inside a bracket; heating the low-melting-point hot-melt adhesive on the surface of the pipe to melt again, and the pipes are adhered to each other to form an integral honeycomb structure; after the hot-melt adhesive is solidified again, a PVC honeycomb core is obtained; preferably, the specifications of the PVC thin-walled small pipe are: DN10*(0.1-0.2mm), DN12*(0.1-0.25mm), DN14*(0.15-0.25mm), DN16*(0.15-0.3mm), and DN20*(0.15-0.35mm).

[0011] The method for preparing a PVC honeycomb core using PVC thin-walled small-diameter pipes, the melting point of the hot melt adhesive is 80-120°C; the heating temperature is 90-120°C, and the heating time is 10-20min; preferably, the hot melt adhesive is EVA (ethylene-vinyl acetate copolymer) or PUR (polyurethane).

[0012] The method for preparing a PVC honeycomb core by using a PVC thin-walled small-diameter pipe comprises the following steps: adding polyvinyl chloride, an environmentally friendly plasticizer, an environmentally friendly stabilizer, an inorganic filler, a lubricant, a toughening agent and a processing aid into a high-speed mixer for high-speed mixing, and then cold mixing, and feeding the powdery mixture into a PVC conical double small-tube extrusion production line to prepare the PVC thin-walled small-diameter pipe.

[0013] The method for preparing a PVC honeycomb core by using a PVC thin-walled small-diameter pipe is as follows: the stirring speed of the high-speed mixing is 1200-1500 rpm, and the stirring time is 8-15 min; the PVC conical double small tube extruder model is SJ51 / 105, and the molding temperatures of each zone are: the temperature of the first zone is 185-195°C, the temperature of the second zone is 175-185°C, the temperature of the third zone is 170-180°C, the temperature of the fourth zone is 160-170°C, and the temperature of the confluence core is 160-170°C. The mold temperature is 180-200°C, the main engine speed is 10-20r / min, and the feeding speed is 12-25r / min.

[0014] The PVC honeycomb core prepared by the above method.

[0015] Beneficial effects: Compared with the existing technology, the advantages of the present invention include:

[0016] The PVC honeycomb core of the present invention has the characteristics of stable structure, strong dimensional stability, high strength, good toughness, flame retardancy, sound insulation, heat insulation, chemical corrosion resistance and strong nail holding force. This material and structure determine its sound insulation, heat insulation, good corrosion resistance and strong nail holding force. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the appearance picture of PVC honeycomb product. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with specific embodiments.

[0019] Example 1

[0020] The weight proportions of the components of PVC thin-walled small-diameter pipes are: 100 parts of polyvinyl chloride (SG-7 type), 3.5 parts of calcium zinc stabilizer, 5 parts of calcium carbonate, 0.2 parts of stearic acid 1801, 0.2 parts of PE wax, 0.1 parts of oxidized polyethylene wax, 4 parts of MBS-564, and 2 parts of ACR processing aid.

[0021] Implementation 2

[0022] The weight proportions of the components of the PVC thin-walled small-diameter pipe are: 100 parts of polyvinyl chloride (SG-7), 3 parts of DOTP, 3 parts of calcium zinc stabilizer, 5 parts of calcium sulfate whisker, 5 parts of CPE, and 1.5 parts of SAN processing aid.

[0023] Example 3

[0024] The weight proportions of the components of the PVC thin-walled small-diameter pipe are: 100 parts of polyvinyl chloride (SG-8), 3 parts of calcium zinc stabilizer, 6 parts of talcum powder, 4 parts of ACR-401, and 1 part of ACR processing aid.

[0025] The preparation method of embodiment 1-3:

[0026] After weighing various raw materials, mix them evenly on the high and low mixing units, with a high mixing speed of 1500r / min, a discharge temperature of 115℃, and a low mixing discharge temperature of 45℃; then add the mixed materials into the hopper of the SJ51 / 105 cone double thin-walled small tube extruder to produce the required specifications (PVC thin-walled small tube specifications: DN10*(0.1~0.2mm), DN12*(0.1~0.25mm), DN14*(0.15~0.25mm), The specific extrusion process for DN16*(0.15~0.3mm) and DN20*(0.15~0.35mm) pipes is as follows: the temperature of extrusion zone 1 is 190±5℃, the temperature of zone 2 is 180±5℃, the temperature of zone 3 is 175±5℃, the temperature of zone 4 is 165±5℃, and the temperature of confluence core is 165±5℃. The mold temperature is 190±10℃. The main machine speed is 10-18r / min, and the feeding speed is 12-20r / min.

[0027] Apply a layer of PUR hot melt adhesive evenly on the processed pipe on the glue coating machine. After the hot melt adhesive solidifies, lay the pipe and place it in the oven to heat and bond the pipes together. Then cool the hot melt adhesive and solidify it again to form a honeycomb structure. The oven heating temperature is 100-120℃. Finally, the heating wire is used to accurately cut it into the required specifications and models of PVC honeycomb products (appearance as shown in the figure) Figure 1 As shown in Figure 1-3, many specifications of products can be made, and only one commonly used specification of product is selected for testing.

[0028] The test results are shown in Table 1. The values ​​in Table 1 are the average values ​​obtained by testing five samples from the same batch. The specifications of Examples 1-3 and the PP honeycomb core are DN12*0.3*2440*1220*14mm (referring to a honeycomb core with a length of 2440mm, a width of 1220mm, and a thickness of 14mm made of a pipe with a nominal outer diameter of 12mm and a wall thickness of 0.3mm).

[0029] Table 1 Performance test results of PVC honeycomb core products and PP honeycomb core products of Examples 1-3

[0030] Performance Testing Test Standards Example 1 Example 2 Example 3 PP honeycomb core <![CDATA[Density (kg / m 3 )]]> GB 1464 115 116 118 80 Compression strength(MPa) GB 1453 2.1 2.4 2.3 0.8 Compression modulus (MPa) GB 1453 20.7 22.5 19.8 13.4 Oxygen Index GB / T 2406 34.3 35.1 36 17.6

Claims

1. A method for preparing a PVC honeycomb core using a PVC thin-walled small-diameter pipe, characterized in that: The components of the PVC thin-walled small-diameter pipe include polyvinyl chloride, and the polyvinyl chloride is ethylene-process SG-7 or SG-8 type resin powder.

2. The method for preparing a PVC honeycomb core using a PVC thin-walled small-diameter pipe according to claim 1, characterized in that: The components of the PVC thin-walled small-diameter pipe also include environmentally friendly plasticizers, environmentally friendly stabilizers, inorganic fillers, lubricants, toughening agents, and processing aids; the weight proportions of each component are: 100 parts of polyvinyl chloride, 0 to 10 parts of environmentally friendly plasticizers, 2 to 5 parts of environmentally friendly stabilizers, 0 to 10 parts of inorganic fillers, 0.3 to 1.5 parts of lubricants, 3 to 10 parts of toughening agents, and 1 to 5 parts of processing aids.

3. The method for preparing a PVC honeycomb core using a PVC thin-walled small-diameter pipe according to claim 2, characterized in that: The weight proportions of the components of the PVC thin-walled small-diameter pipe are: 100 parts of polyvinyl chloride, 0-5 parts of environmentally friendly plasticizer, 3-4 parts of environmentally friendly stabilizer, 0-5 parts of inorganic filler, 0.3-0.7 parts of lubricant, 3-6 parts of toughening agent, and 1-3 parts of processing aid.

4. The method for preparing a PVC honeycomb core using a PVC thin-walled small-diameter pipe according to claim 2, characterized in that: The environmentally friendly plasticizer is one or more of DOTP, DOA, DOS, and DOZ; the environmentally friendly stabilizer is one or more of calcium zinc stabilizer, barium zinc stabilizer, and calcium barium zinc stabilizer; the inorganic filler is calcium carbonate, talcum powder, wollastonite, and calcium sulfate whisker, with a mesh size of 1000 to 2500 mesh; the lubricant is one or more of monoglyceride, stearic acid, polyethylene wax, and ethylene oxide wax; the toughening agent is one or more of ACR, MBS, and CPE; and the processing aid is one or more of ACR and SAN processing aids.

5. The method for preparing a PVC honeycomb core using a PVC thin-walled small-diameter pipe according to claim 4, characterized in that: The polyvinyl chloride is ethylene-based SG-7 resin powder; the environmentally friendly plasticizer is DOTP; and the environmentally friendly stabilizer is a calcium zinc stabilizer.

6. The method for preparing a PVC honeycomb core using a PVC thin-walled small-diameter pipe according to claim 1, characterized in that: A layer of hot melt adhesive is applied on the outer surface of the PVC thin-walled small-diameter pipe; after the hot melt adhesive cools and solidifies, the PVC thin-walled small-diameter pipe coated with the hot melt adhesive is laid inside the bracket; the low-melting-point hot melt adhesive heated to the surface of the pipe melts again, and the pipes adhere to each other to form an integral honeycomb structure; after the hot melt adhesive solidifies again, a PVC honeycomb core is obtained.

7. The method for preparing a PVC honeycomb core using a PVC thin-walled small-diameter pipe according to claim 6, characterized in that: The melting point of the hot melt adhesive is 80-120° C.; the heating temperature is 90-120° C.; and the heating time is 10-20 minutes.

8. The method for preparing a PVC honeycomb core using a PVC thin-walled small-diameter pipe according to claim 2, characterized in that: Polyvinyl chloride, environmentally friendly plasticizer, environmentally friendly stabilizer, inorganic filler, lubricant, toughening agent and processing aid are added to a high-speed mixer for high-speed mixing, and then cold mixed. The powdery mixture is fed into a PVC conical double small tube extrusion production line to prepare PVC thin-wall small-diameter pipes.

9. The method for preparing a PVC honeycomb core using a PVC thin-walled small-diameter pipe according to claim 8, characterized in that: The stirring speed of the high-speed mixing is 1200-1500 rpm, and the stirring time is 8-15 min. The model of the PVC conical double small tube extruder is SJ51 / 105, and the molding temperature of each zone is: the temperature of zone 1 is 185-195°C, the temperature of zone 2 is 175-185°C, the temperature of zone 3 is 170-180°C, the temperature of zone 4 is 160-170°C, and the temperature of the confluence core is 160-170°C. The mold temperature is 180-200°C, the main engine speed is 10-20r / min, and the feeding speed is 12-25r / min.

10. A PVC honeycomb core prepared by the method according to any one of claims 1 to 9.

Images