Plastic floor base material prepared from recycled PET (Polyethylene Terephthalate)

Abstract

The invention discloses a plastic floor base material prepared from recycled PET, and relates to the technical field of floors, the base material is prepared by mixing a recycled PET material, stone powder, a chain extender, stearic acid, an oil body and an elastomer, the recycled PET material accounts for 15%-25%, the stone powder accounts for 65%-78%, the chain extender accounts for 0.4%-1%, the stearic acid accounts for 0.5%-2%, and the oil body accounts for 1%-3%. According to the present invention, the recycled PET is adopted as the adhesive to adhere the stone powder, and extrusion molding is performed through the extruder to prepare the plastic floor base material, such that the GRS and SCS certified products can be easily obtained, the PET product cannot be decomposed into the chlorine gas and the hydrogen chloride with the pungent odor like the conventional PVC plastic floor base material, and the recovered PET material has the more sources, such that the production cost is low, and the production efficiency is high. And the market is wider.

Description

Technical Field

[0001] The invention relates to the technical field of flooring, in particular to a plastic flooring substrate made of recycled PET. Background Art

[0002] At present, the plastic floor substrate is mainly made of PVC and stone powder as the main materials, but PVC is easily decomposed by light and heat, and decomposes chlorine and hydrogen chloride, which are irritating gases, which will irritate the respiratory tract and affect human health. For environmental protection, new plastic floors generally use PETG, TPU, PP and other non-toxic new materials. However, with the increasing awareness of environmental protection, European and American countries are more willing to accept products made of recycled materials to protect the increasingly damaged environment. Products with GRS and SCS certification have a broader market than conventional new material products. The source of recycled PET is very wide, and common beverage bottles and waste spinning for making clothes are all cheap recycled PET. Therefore, we plan to develop a plastic floor substrate made of recycled PET. . Summary of the invention

[0003] Purpose of the invention: The technical problem to be solved by the present invention is to provide a plastic floor substrate made of recycled PET, which solves the problem that existing waste PET cannot be recycled.

[0004] Technical Solution

[0005] To solve the above problems, the technical solution provided by the present invention is:

[0006] A plastic floor substrate made of recycled PET, wherein the substrate is prepared by mixing recycled PET material, stone powder, chain extender, stearic acid, oil body and elastomer, wherein the recycled PET material accounts for 15% to 25%, the stone powder accounts for 65% to 78%, the chain extender accounts for 0.4% to 1%, the stearic acid accounts for 0.5% to 2%, the oil body accounts for 1% to 3%, and the elastomer accounts for 1% to 5%.

[0007] Furthermore, the recycled PET material requires that the content of sand or silicon dioxide in the crushed material is ≤0.5%, and the moisture content is ≤0.3%.

[0008] Furthermore, the particle size is any calcium carbonate powder with a mesh size of 300-400.

[0009] Furthermore, the stearic acid is required to have a molecular weight of ≤300.

[0010] Furthermore, the oil body is industrial grade white oil, and the model is selected between 5#-68#.

[0011] Furthermore, the elastomer is nitrile rubber, the molecular weight of the nitrile rubber is 650,000-750,000, and the particle size is about ≤0.8 mm.

[0012] Furthermore, the recycled PET material accounts for 20%, the stone powder accounts for 75%, the chain extender accounts for 1%, the stearic acid accounts for 1%, the oil body accounts for 1%, and the elastomer accounts for 2%.

[0013] Furthermore, the recycled PET material accounts for 20%, the stone powder accounts for 73%, the chain extender accounts for 1.5%, the stearic acid accounts for 1.5%, the oil body accounts for 1.5%, and the elastomer accounts for 2.5%.

[0014] A method for preparing a plastic floor substrate made of recycled PET comprises the following steps: mixing materials according to a certain proportion, putting the mixed materials into equipment for granulation, and then putting the substrate particles into an extruder to extrude the substrate through the extruder.

[0015] Furthermore, the length of the substrate particles is no more than 3 mm and the diameter is less than 2 mm.

[0016] Beneficial Effects

[0017] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0018] Recycled PET is used as an adhesive to bond stone powder, which is then extruded through an extruder to form the base material for plastic flooring. It is very easy to obtain GRS and SCS certified products. At the same time, PET products will not decompose into chlorine and hydrogen chloride with a pungent odor when exposed to light like conventional PVC plastic flooring base materials. In addition, since there are many sources of recycled PET materials, it has a broader market. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the process flow of Example 1 of the present invention. DETAILED DESCRIPTION

[0020] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Example 1

[0022] Combined with Figure 1 , a plastic floor substrate made of recycled PET, uses recycled PET as an adhesive to bond stone powder, which can meet environmental protection needs. At the same time, the source of recycled PET is very wide, common beverage bottles, and waste spinning for making clothes are all cheap recycled PET, which can greatly save costs.

[0023] The floor substrate is prepared by mixing recycled PET material, stone powder, chain extender, stearic acid, oil body and elastomer.

[0024] First, recycled PET materials account for 15% to 25%. The recycled PET materials come from various beverage bottles without bottle caps. Bottle caps are PE, so they cannot be used. Beverage bottles need to be crushed and cleaned. The crushed materials are required to have a sand or silica content of ≤0.5% and a moisture content of ≤0.3%. Used as product adhesives;

[0025] Stone powder accounts for 65% to 78%, and any calcium carbonate powder with a particle size of 300-400 mesh is used as filler, and the moisture content is ≤0.1%;

[0026] The chain extender accounts for 0.4% to 1%, and is used as a chain extender for PET chain extension to prevent hydrolysis during PET processing. The preferred grade is Joncryl ADR 4468;

[0027] Stearic acid accounts for 0.5% to 2%, mainly plays an internal lubricating role, and the molecular weight is required to be ≤300, and the preferred grade is SA1841;

[0028] The oil body accounts for 1% to 3%, mainly for external lubrication, and is used for substrate demolding. Industrial grade white oil can be used, and the model can be selected between 5#-68#, preferably industrial lubricating white oil 10#;

[0029] The elastomer accounts for 1% to 5%. Nitrile rubber is used as the elastomer to enhance the toughness of the substrate. The molecular weight of the nitrile rubber is 650,000-750,000, and the particle size is about ≤0.8mm. The preferred brand is maleic anhydride grafted POE-G-GMA elastomer CH-904.

[0030] 2. Process flow:

[0031] First, the above materials are mixed according to a certain proportion, and after mixing, they are put into equipment for granulation, and then the base material particles are put into an extruder, and the base material is extruded through the extruder.

[0032] Granulation process: All raw materials are put into a high-speed mixer in order according to the proportion and not in any order. The materials will generate heat to 90℃ by themselves through stirring friction, and will automatically open the feeding port and enter the low-speed mixer to cool to 40℃ before use.

[0033] The mixed materials are put into a 60-type parallel twin-screw granulation extruder for extrusion. The screw temperature is set from high to low, 320-280°C. After extrusion, the materials are cut into particles with a length of ≤3mm and a diameter of less than 2mm.

[0034] Extruder core technology:

[0035] Use an ordinary 110 model flat twin-screw extruder for extrusion, set the screw temperature from high to low, 320-280℃, the extrusion mold temperature is 280-290℃, and the temperature of each molding roller is set to 190℃.

[0036] Use recycled PET as an adhesive to bond stone powder, extrude it through an extruder to make the base material of the plastic floor. When the base material thickness is ≥4mm, the product performance meets the following requirements:

[0037] 1. According to GB / T 11718-2009 and GB / T 17657-2013, the average static bending strength shall be ≥18MPa, the average elastic modulus shall be ≥3000MPa, and the average deformation at the maximum force point shall be ≥3mm;

[0038] 2. After slotting, the test is carried out according to ISO 10582-2017 and ISO 24334-2019, and the lock tension is ≥15kgf / 50mm;

[0039] The substrate is tested according to EN 13329:2016+A2:2021, and the falling ball impact height is ≥1200mm.

[0040] Best example 1:

[0041] The recipe used is as follows:

[0042] raw material model Ratio Recycled PET Crushed and recycled colored bottle flakes with moisture content less than 0.3% 20％ Stone powder White, particle size 350 mesh 75％ Chain Extender Joncryl ADR 4468 1％ Stearic acid SA1841 1％ Oil body Industrial lubricating white oil 10# 1％ Elastomer Maleic anhydride grafted POE-G-GMA elastomer CH-904 2％

[0043] Put all raw materials into high-speed mixer in the order of proportion in the above table. The materials will generate heat to 90℃ by stirring friction. The material will open the opening automatically and enter the low-speed mixer to cool to 40℃. Take out the raw materials and put them into 60 type parallel twin-screw granulation extruder for extrusion. The screw temperature is set from high to low, 320-280℃. After extrusion, they are cut into particles with a length of ≤3mm and a diameter of less than 2mm.

[0044] The granulated material is extruded using a common 110 model flat twin-screw extruder, with the screw temperature set from high to low, 320-280°C, the extrusion die temperature 280-290°C, and the temperature of each forming roller set to 190°C. Finally, a qualified substrate of 1000mm*1600mm*5.0mm is extruded.

[0045] After testing, the average static bending strength of the substrate is 32MPa, the average elastic modulus is 3800MPa, and the average deformation at the maximum force point is 4.0mm, which meets the requirements.

[0046] Best Example 2:

[0047] The recipe used is as follows:

[0048] raw material model Ratio Recycled PET Crushed and recycled colored bottle flakes with moisture content less than 0.3% 20％ Stone powder White, particle size 350 mesh 73％ Chain Extender Joncryl ADR 4468 1.5％ Stearic acid SA1841 1.5％ Oil body Industrial lubricating white oil 10# 1.5％ Elastomer Maleic anhydride grafted POE-G-GMA elastomer CH-904 2.5％

[0049] Put all raw materials into high-speed mixer in the order of proportion in the above table. The materials will generate heat to 90℃ by stirring friction. The material will open the opening automatically and enter the low-speed mixer to cool to 40℃. Take out the raw materials and put them into 60 type parallel twin-screw granulation extruder for extrusion. The screw temperature is set from high to low, 320-280℃. After extrusion, they are cut into particles with a length of ≤3mm and a diameter of less than 2mm.

[0050] The granulated material is extruded using a common 110 model flat twin-screw extruder, with the screw temperature set from high to low, 320-280°C, the extrusion die temperature 280-290°C, and the temperature of each forming roller set to 190°C. Finally, a qualified substrate of 1000mm*1600mm*5.5mm is extruded.

[0051] After testing, the average static bending strength of the substrate is 28MPa, the average elastic modulus is 4350MPa, and the average deformation at the maximum force point is 4.3mm, which meets the requirements.

[0052] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A plastic floor substrate made of recycled PET, characterized in that: The substrate is prepared by mixing recycled PET material, stone powder, chain extender, stearic acid, oil body and elastomer, wherein the recycled PET material accounts for 15% to 25%, the stone powder accounts for 65% to 78%, the chain extender accounts for 0.4% to 1%, the stearic acid accounts for 0.5% to 2%, the oil body accounts for 1% to 3%, and the elastomer accounts for 1% to 5%.

2. The plastic floor substrate made of recycled PET according to claim 1, characterized in that: The recycled PET material requires that the crushed material has a sand or silicon dioxide content of ≤0.5% and a moisture content of ≤0.3%.

3. The plastic floor substrate made of recycled PET according to claim 1, characterized in that: The particle size is any calcium carbonate powder with a mesh size of 300-400.

4. The plastic floor substrate made of recycled PET according to claim 1, characterized in that: The stearic acid is required to have a molecular weight of ≤300.

5. The plastic floor substrate made of recycled PET according to claim 1, characterized in that: The oil body is industrial grade white oil, and the model is selected between 5#-68#.

6. The plastic floor substrate made of recycled PET according to claim 1, characterized in that: The elastomer is nitrile rubber, the molecular weight of the nitrile rubber is 650,000-750,000, and the particle size is about ≤0.8 mm.

7. The plastic floor substrate made of recycled PET according to claim 1, characterized in that: The recycled PET material accounts for 20%, the stone powder accounts for 75%, the chain extender accounts for 1%, the stearic acid accounts for 1%, the oil body accounts for 1%, and the elastomer accounts for 2%.

8. The plastic floor substrate made of recycled PET according to claim 1, characterized in that: The recycled PET material accounts for 20%, the stone powder accounts for 73%, the chain extender accounts for 1.5%, the stearic acid accounts for 1.5%, the oil body accounts for 1.5%, and the elastomer accounts for 2.5%.

9. A method for producing a plastic floor substrate made of recycled PET according to any one of claims 1 to 8, characterized in that: The materials are mixed according to the proportion, and after mixing, they are put into the equipment for granulation, and then the base material particles are put into the extruder, and the base material is extruded through the extruder.

10. The method for making a plastic floor substrate made of recycled PET according to claim 9, characterized in that: The length of the substrate particles is no more than 3 mm and the diameter is less than 2 mm.

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