Preparation method of cork bottom sheet

Abstract

The invention discloses a preparation method of a cork bottom sheet, cork and polyvinyl chloride resin are subjected to banburying and open milling to prepare a PVC cork bottom sheet, the PVC resin is added into the cork, the cork bottom sheet not only has the sound insulation and heat insulation performance of the cork, but also has the performance of polymer resin, and the bottom sheet is easy to process. The PVC cork bottom sheet does not need to be attached through glue, the PVC cork bottom sheet can be attached to the PVC floor through direct heating, the prepared cork PVC mute floor has the advantages of a traditional PVC floor, the sound insulation effect of the cork PVC mute floor is effectively improved, and the peel strength and warping of the cork PVC mute floor both meet the national or industrial related standards. According to the bottom piece, the cork attaching procedure is simplified, the production efficiency is improved, the production cost is reduced, the glue technology is omitted, harmful substances are avoided, and the bottom piece is safe and environmentally friendly.

Description

Technical Field

[0001] The present invention relates to the field of preparation of floor base films, and in particular to a method for preparing a cork base film. Background Art

[0002] Plastic (PVC) floors are a high-grade and environmentally friendly decorative material, with the advantages of being ultra-light, ultra-thin, highly wear-resistant, and having strong impact resistance, and have a very good market prospect in overseas developed countries. Traditional rigid PVC floors not only have excellent dimensional stability, high locking strength, mildew resistance, moisture resistance, insect resistance, and are convenient and fast to install, but are also widely popular in developed countries in Europe, America and the Asia-Pacific market, such as various places like families, hospitals, schools, office buildings, factories, public places, supermarkets, and commerce. Among them, cork PVC floors have better sound insulation and moisture-proof effects, and bring an excellent foot feeling; cork floors are soft, quiet, and comfortable, can provide great buffering, and their unique sound insulation and heat insulation performance are also very suitable for applications in places such as bedrooms, meeting rooms, libraries, and recording studios.

[0003] Cork is a natural environmental protection material, whose main raw material is oak bark, does not contain harmful substances, and has good environmental protection performance. Cork can not only provide a safe and healthy living environment for family members, but also help protect natural resources and reduce deforestation.

[0004] However, due to the structure of the raw materials of cork floors, the wear resistance of cork floors is relatively poor. At present, cork is bonded to the floor with glue, the production process is complex, a series of supporting equipment is required, the labor cost is high, a production line needs to be equipped with 5-6 operators, the manual bonding efficiency is low, the apparent control cost is high, and the labor cost and equipment cost are high. After bonding with glue, the peeling strength between cork and the floor is generally low, affecting the floor performance. In addition, the existing cork floors have poor wear resistance, and the glue may release harmful substances.

[0005] Therefore, it is necessary to develop a base film that combines the advantages of cork and the easy processing performance of polymer resins. Summary of the Invention

[0006] Object of the Invention: To solve the problems existing in the prior art, the present invention provides a method for preparing a cork base film, which not only has the advantages of traditional PVC floors, but also effectively improves its sound insulation effect.

[0007] Technical solution: To achieve the above object, the present invention may adopt the following technical solution: A preparation method of a cork negative film, which directly combines cork particles, rosin with polyvinyl chloride resin, plasticizer, filler and other additives through a kneading-calendering process to obtain a cork negative film without glue. By kneading and open-milling cork and polyvinyl chloride resin, a PVC cork negative film is prepared. Adding PVC resin to the cork not only has the sound insulation and heat insulation properties of cork, but also has the properties of high molecular resin.

[0008] Furthermore, the above preparation method includes the following steps:

[0009] (1) Add polyvinyl chloride resin, plasticizer, cork particles, rosin and stabilizer to a high-speed mixer, and mix at a speed of 900-1000 r / min at 100-120 °C for 10-12 min;

[0010] (2) Transfer the mixed material in step (1) to a cold mixer, add the measured filler, and mix at a low speed of 80-90 r / min for 5-10 min;

[0011] (3) Convey the cold-mixed material to a kneader, add carbon black colorant, and knead at 120-150 °C for 10-14 min;

[0012] (4) Calender and form the kneaded mixture through a four-roll calender to finally obtain a cork negative film with a thickness of 1.0 ± 0.05 mm.

[0013] Furthermore, the particle size of the cork particles is 4-30 mesh, accounting for 15-23% of the total mass of the mixture.

[0014] Furthermore, the addition amount of the polyvinyl chloride resin accounts for 30-45% of the total mass of the mixture.

[0015] Furthermore, the plasticizer is a bio-based plasticizer; the bio-based plasticizer is one or a mixture of two of epoxidized soybean oil and halogenated fatty acid methyl ester plasticizers, and the addition amount is 10-20% of the total mass of the mixture.

[0016] Furthermore, the addition amount of the rosin accounts for 0.63-0.8% of the total mass of the mixture.

[0017] Furthermore, the filler is calcium carbonate, and the addition amount is 18-40% of the total mass of the mixture.

[0018] Furthermore, the stabilizer is a calcium-zinc composite stabilizer, and the addition amount is 0.8-1.4% of the total mass of the mixture.

[0019] Furthermore, the cork base film is directly compounded with the PVC floor by heating without glue bonding, and the peel strength is ≥7.5 lbf.

[0020] Furthermore, in step (4), when forming by four-roll calendering, the temperatures of the four rolls are respectively controlled as follows: the first roll is 180 - 190 °C, the second roll is 185 - 195 °C, the third roll is 190 - 195 °C, and the fourth roll is 190 - 195 °C. The speed ratio between the rolls is controlled at 1:1.1 - 1:1.5.

[0021] Beneficial effects: The present invention has the following advantages:

[0022] 1) The cork and polyvinyl chloride resin are kneaded and open-milled to prepare a PVC cork base film. Adding PVC resin to the cork not only has the sound insulation and heat insulation properties of the cork but also has the properties of high molecular resin, and this base film is easy to process.

[0023] 2) The PVC cork base film does not need glue bonding and can be directly bonded to the PVC floor by heating to prepare a cork PVC soundproof floor. It not only has the advantages of traditional PVC floors but also effectively improves its sound insulation effect, and the peel strength and warping both meet the relevant national or industrial standards.

[0024] 3) This base film simplifies the process of cork bonding, improves production efficiency, reduces production costs, eliminates the glue process, avoids the generation of harmful substances, and is safe and environmentally friendly. Specific embodiments

[0025] Example 1:

[0026] Prepare the cork base film according to the following steps:

[0027] Add 100 kg of PVC resin, 36 kg of halogenated fatty acid methyl ester plasticizer, 6 kg of epoxy soybean oil, 50 kg of cork granules (8 mesh), 2 kg of rosin, and 3.3 kg of calcium-zinc stabilizer to a high-speed mixer, mix at 110 °C and 950 r / min for 11 minutes; transfer to a cold mixer, add 110 kg of calcium carbonate, and mix at a low speed of 85 r / min for 8 minutes; add 0.5 kg of carbon black to a kneader and knead at 140 °C for 12 minutes; set the temperature of the four-roll calender as the first roll at 185 °C, the second roll at 190 °C, the third roll at 195 °C, and the fourth roll at 195 °C, with a roll speed ratio of 1:1.3, and calender to obtain a base film with a thickness of 1.0 mm.

[0028] Example 2:

[0029] Add 100 kg of PVC resin, 35 kg of halogenated fatty acid methyl ester plasticizer, 6 kg of epoxidized soybean oil, 50 kg of cork granules (8 mesh), 2.1 kg of rosin, and 2.7 kg of calcium-zinc stabilizer into a high-speed mixer, and mix at 100 °C and 900 r / min for 10 minutes; transfer to a cold mixer, add 120 kg of calcium carbonate, and mix at a low speed of 80 r / min for 6 min; add 0.5 kg of carbon black into a kneader, and knead at 120 °C for 10 min; set the temperature of a four-roll calender as 185 °C for the first roll, 190 °C for the second roll, 195 °C for the third roll, and 195 °C for the fourth roll, with a roll speed ratio of 1:1.1, and calender to obtain a negative film with a thickness of 1.0 mm.

[0030] Example 3:

[0031] Add 100 kg of PVC resin, 30 kg of halogenated fatty acid methyl ester plasticizer, 6 kg of epoxidized soybean oil, 50 kg of cork granules (8 mesh), 2.1 kg of rosin, and 2.7 kg of calcium-zinc stabilizer into a high-speed mixer, and mix at 120 °C and 1000 r / min for 12 minutes; transfer to a cold mixer, add 50 kg of calcium carbonate, and mix at a low speed of 90 r / min for 10 min; add 0.5 kg of carbon black into a kneader, and knead at 150 °C for 14 min; set the temperature of a four-roll calender as 185 °C for the first roll, 190 °C for the second roll, 195 °C for the third roll, and 195 °C for the fourth roll, with a roll speed ratio of 1:1.5, and calender to obtain a negative film with a thickness of 1.0 mm.

[0032] Comparative Example 1:

[0033] The other preparation method of the negative film is the same as that of Example 1, except that cork granules and rosin are not added. The finished cork floor is prepared by laminating the negative film layer and the cork layer with glue.

[0034] Use the negative film layer prepared in Example 1 and the negative film layer prepared in Comparative Example 1, and use the same process to prepare the finished cork floor with the cork layer. The other layer formulations and treatment methods are the same, and tests on the heating length change rate, smoke density, bio-based content, sound insulation effect, peel strength, and warping are carried out. The test basis and results are shown in Table 1 below:

[0035] Table 1 Test standards and test results

[0036]

[0037] From the test results in Table 1, it can be seen that the cork floors prepared by the present invention meet the requirements in terms of conventional indicators, and are basically the same as the floors prepared by conventional methods. In particular, the peel strength also meets the requirements, and the sound insulation effect is even more excellent. Moreover, when the base film of the present invention is applied to the preparation of cork floors, there is no need for glue bonding, and it can be directly heated to fit with the PVC floor to prepare a cork PVC soundproof floor. It not only has the advantages of traditional PVC floors, but also effectively improves its sound insulation effect. The peel strength and warping both meet the relevant national or industrial standards. This base film simplifies the cork bonding process, improves production efficiency, reduces production costs, eliminates the glue process, avoids the generation of harmful substances, and is safe and environmentally friendly.

Claims

1. A method for preparing a cork negative, characterized in that: Cork granules, rosin, polyvinyl chloride resin, plasticizer, filler and other additives are directly compounded by a kneading-calendering process to obtain a cork negative film without glue.

2. The preparation method of the cork negative as claimed in claim 1, characterized in that It includes the following steps: (1) Add polyvinyl chloride resin, plasticizer, cork granules, rosin and stabilizer to a high-speed mixer, and mix at a speed of 900-1000 r / min for 10-12 min at 100-120 °C; (2) Transfer the mixed material in step (1) to a cold mixer, add the measured filler, and mix at a low speed of 80-90 r / min for 5-10 min; (3) Convey the cold-mixed material to a kneader, add carbon black colorant, and knead at 120-150 °C for 10-14 min; (4) Calender and form the kneaded mixture through a four-roll calender to finally obtain a cork negative film with a thickness of 1.0 ± 0.05 mm.

3. The preparation method of the cork negative according to claim 1 or 2, characterized in that: The particle size of the cork granules is 4-30 mesh, accounting for 15-23% of the total mass of the mixture.

4. The preparation method of the cork negative according to claim 1 or 2, characterized in that: The addition amount of the polyvinyl chloride resin accounts for 30-45% of the total mass of the mixture.

5. The preparation method of the cork negative according to claim 1 or 2, characterized in that: The plasticizer is a bio-based plasticizer; the bio-based plasticizer is one or a mixture of two of epoxidized soybean oil and halogenated fatty acid methyl ester plasticizers, and the addition amount is 10-20% of the total mass of the mixture.

6. The method for preparing the cork negative according to claim 1 or 2, characterized in that: The rosin accounts for 0.63-0.8% of the total mass of the mixture.

7. The method for preparing the cork negative according to claim 1 or 2, characterized in that: The filler is calcium carbonate, and the addition amount is 18-40% of the total mass of the mixture.

8. The preparation method of the cork negative according to claim 1 or 2, characterized in that: The stabilizer is a calcium-zinc composite stabilizer, and the addition amount is of the total mass of the mixture.

9. The preparation method of the cork negative according to claim 1 or 2, characterized in that: The cork negative film is directly compounded with the PVC floor by heating without glue sticking, and the peel strength ≥ 7.5 lbf.

10. The preparation method of the cork negative according to claim 2, characterized in that: During the four-roll calendering and forming in step (4), the temperatures of the four rolls are respectively controlled as follows: the first roll is 180-190 °C, the second roll is 185-195 °C, the third roll is 190-195 °C, the fourth roll is 190-195 °C, and the roll speed ratio is controlled at 1:1.1-1:1.5.

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