PVC flame-retardant film and preparation method thereof

Abstract

The invention relates to the technical field of PVC films, in particular to a PVC flame-retardant film and a preparation method thereof.The PVC flame-retardant film is prepared from 95-110 parts of PVC resin powder, 32-38 parts of filler, 40-50 parts of plasticizer, 2-3 parts of stabilizer and 2-3 parts of flame retardant. Through the specific flame retardant composition and by controlling the mass ratio of the substances in the flame retardant, the flame retardant composition can ensure that the flame retardant effect is obvious and the fitness is good under the conditions of reducing the addition amount of the flame retardant and reducing the cost, and can be applied to automobile wire harness adhesive tapes and environment-friendly flame-retardant adhesive tapes.

Description

Technical Field

[0001] The invention relates to the technical field of PVC films, and in particular to a PVC flame-retardant film and a preparation method thereof. Background Art

[0002] At present, as the excellent performance, simple preparation process and many other advantages of PVC film are recognized by the public, it has been more and more widely used in daily life. Among them, the wiring harness tape used in automobiles requires environmentally friendly flame-retardant tape, which is composed of PVC raw cloth film and pressure-sensitive adhesive. The flame retardant effect of flame-retardant tape is mainly achieved by antimony trioxide in the PVC raw cloth film. In recent years, with the fluctuation of market conditions, the price of antimony trioxide has continued to rise, resulting in high production costs of flame-retardant tape.

[0003] Chinese invention patent CN116589802A discloses a highly flame-retardant and tough PVC film and its preparation method. By adding a high proportion of inorganic minerals to compound flame retardants and having good compatibility with other substrates, the flame retardancy of the PVC film can be effectively improved while maintaining good right-angle tear strength. However, the amount of antimony trioxide in the flame retardant is relatively high, and the production cost is relatively high. Summary of the invention

[0004] In order to solve the problems in the prior art, the first aspect of the present invention provides a PVC flame retardant film, whose preparation raw materials include, by mass: 95-110 parts of PVC resin powder, 32-38 parts of filler, 40-50 parts of plasticizer, 2-3 parts of stabilizer, and 2-3 parts of flame retardant.

[0005] In one embodiment, the filler is calcium carbonate powder, and the mesh size of the calcium carbonate powder is 2000 mesh.

[0006] In one embodiment, the plasticizer includes one or more of dioctyl phthalate, diisononyl phthalate, dioctyl terephthalate, and epoxidized soybean oil.

[0007] In one embodiment, the plasticizer includes dioctyl phthalate and epoxidized soybean oil.

[0008] In one embodiment, the mass ratio of dioctyl phthalate to epoxy soybean oil in the plasticizer is (20-22):1.

[0009] In one embodiment, the mass ratio of dioctyl phthalate to epoxy soybean oil in the plasticizer is 21.4:1.

[0010] In one embodiment, the stabilizer includes one or both of a liquid stabilizer and a powder stabilizer.

[0011] In one embodiment, the stabilizer includes a liquid stabilizer and a powder stabilizer.

[0012] In one embodiment, the mass ratio of the liquid stabilizer to the powder stabilizer is (1.6-1.7): (0.5-0.6).

[0013] In one embodiment, the mass ratio of the liquid stabilizer to the powder stabilizer is 1.6:0.5.

[0014] In one embodiment, the liquid stabilizer includes one or both of a liquid barium zinc stabilizer and a liquid calcium zinc stabilizer.

[0015] In one embodiment, the liquid stabilizer is a liquid barium zinc stabilizer.

[0016] In one embodiment, the liquid barium zinc stabilizer is selected from barium zinc stabilizer 105, which is purchased from Guangzhou Baisha Plastic New Materials Co., Ltd. with a brand name of PV4022.

[0017] In one embodiment, the powder stabilizer includes one or both of a powdered barium zinc stabilizer and a powdered calcium zinc stabilizer.

[0018] In one embodiment, the powder stabilizer is a powder calcium zinc stabilizer.

[0019] In one embodiment, the powdered calcium zinc stabilizer is purchased from Guangzhou Baisha Plastic New Materials Co., Ltd. with a brand name of PV-4031.

[0020] In one embodiment, the flame retardant includes one or more of antimony trioxide, zinc borate, aluminum hydroxide, and magnesium hydroxide.

[0021] In one embodiment, the flame retardant is antimony trioxide and aluminum hydroxide.

[0022] In one embodiment, the mass ratio of antimony trioxide to aluminum hydroxide in the flame retardant is 1:(1-2).

[0023] In one embodiment, the mass ratio of antimony trioxide to aluminum hydroxide in the flame retardant is 1:2.

[0024] The second aspect of the present invention provides a method for preparing a PVC flame retardant film, comprising the following steps: mixing PVC resin powder, filler, plasticizer, stabilizer and flame retardant, and subjecting the mixture to pre-plasticization, plasticizing and plasticizing, calendering, cooling, cutting and winding to obtain the film.

[0025] Beneficial Effects

[0026] 1. The PVC flame-retardant film prepared by the present invention has cost advantages and better conformability while achieving flame-retardant effects, and can be applied to automotive wiring harness tapes and environmentally friendly flame-retardant tapes.

[0027] 2. The PVC flame retardant film prepared by the present invention adopts a specific composite flame retardant, especially when the mass ratio of antimony trioxide and aluminum hydroxide in the composite flame retardant is controlled to 1: (1-2), the flame retardant effect can be ensured to be obvious while reducing the amount of flame retardant added and reducing costs, and the prepared PVC film achieves a level 1 flame retardant effect.

[0028] 3. Based on the system of the present invention, the use of a specific composite flame retardant and the synergistic effect of raw materials such as stabilizers in the system can significantly improve the dispersibility of the system, thereby improving the conformability of the tape wrapping.

[0029] 4. The PVC flame retardant film prepared by the present invention adopts a specific composite flame retardant and a specific stabilizer combination, which can improve the heat shrinkage rate of the product.

[0030] 5. The raw materials of the PVC flame-retardant film of the present invention are easily available, easy to prepare, low in cost, and easy to industrially produce. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a test chart of the conformability of the sample prepared in Example 5.

[0032] Figure 2 This is a test chart of the conformability of the sample prepared in Example 7. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the examples and drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. The experimental methods for which specific conditions are not specified in the examples are carried out under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used that do not specify the manufacturer are all conventional products that can be purchased commercially.

[0034] Example 1

[0035] In a first aspect, the present embodiment provides a PVC flame retardant film, wherein the raw materials for preparing the film include, by weight: 100 parts of PVC resin powder, 35 parts of filler, 44.8 parts of plasticizer, 2.1 parts of stabilizer, and 3 parts of flame retardant.

[0036] The filler is calcium carbonate powder, and the mesh number of the calcium carbonate powder is 2000 meshes.

[0037] The plasticizers are dioctyl phthalate and epoxidized soybean oil.

[0038] The mass ratio of dioctyl phthalate to epoxidized soybean oil is 21.4:1.

[0039] The stabilizer is a liquid barium zinc stabilizer and a powdered calcium zinc stabilizer.

[0040] The mass ratio of the liquid barium zinc stabilizer to the powdered calcium zinc stabilizer is 1.6:0.5.

[0041] The flame retardant is antimony trioxide.

[0042] The second aspect of the present embodiment provides a method for preparing a PVC flame retardant film, comprising the following steps: mixing PVC resin powder, filler, plasticizer, stabilizer, and flame retardant, and subjecting the mixture to pre-plasticization, plasticizing, calendering, cooling, cutting, and winding.

[0043] Example 2

[0044] In a first aspect, the present embodiment provides a PVC flame retardant film, wherein the raw materials for preparing the film include, by weight: 100 parts of PVC resin powder, 35 parts of filler, 44.8 parts of plasticizer, and 2.1 parts of stabilizer.

[0045] The filler is calcium carbonate powder, and the mesh number of the calcium carbonate powder is 2000 meshes.

[0046] The plasticizers are dioctyl phthalate and epoxidized soybean oil.

[0047] The mass ratio of dioctyl phthalate to epoxidized soybean oil is 21.4:1.

[0048] The stabilizer is a liquid barium zinc stabilizer and a powdered calcium zinc stabilizer.

[0049] The mass ratio of the liquid barium zinc stabilizer to the powdered calcium zinc stabilizer is 1.6:0.5.

[0050] The second aspect of the present embodiment provides a method for preparing a PVC flame retardant film, comprising the following steps: mixing PVC resin powder, filler, plasticizer, and stabilizer, and subjecting the mixture to pre-plasticization, plasticizing, calendering, cooling, cutting, and winding.

[0051] Example 3

[0052] In a first aspect, the present embodiment provides a PVC flame retardant film, wherein the raw materials for preparing the film include, by weight: 100 parts of PVC resin powder, 35 parts of filler, 44.8 parts of plasticizer, 2.1 parts of stabilizer, and 3 parts of flame retardant.

[0053] The filler is calcium carbonate powder, and the mesh number of the calcium carbonate powder is 2000 meshes.

[0054] The plasticizers are dioctyl phthalate and epoxidized soybean oil.

[0055] The mass ratio of dioctyl phthalate to epoxidized soybean oil is 21.4:1.

[0056] The stabilizer is a liquid barium zinc stabilizer and a powdered calcium zinc stabilizer.

[0057] The mass ratio of the liquid barium zinc stabilizer to the powdered calcium zinc stabilizer is 1.6:0.5.

[0058] The flame retardants are antimony trioxide, zinc borate and aluminum hydroxide.

[0059] The mass ratio of antimony trioxide, zinc borate and aluminum hydroxide is 1:1:1.

[0060] The second aspect of the present embodiment provides a method for preparing a PVC flame retardant film, comprising the following steps: mixing PVC resin powder, filler, plasticizer, stabilizer, and flame retardant, and subjecting the mixture to pre-plasticization, plasticizing, calendering, cooling, cutting, and winding.

[0061] Example 4

[0062] In a first aspect, the present embodiment provides a PVC flame retardant film, wherein the raw materials for preparing the film include, by weight: 100 parts of PVC resin powder, 35 parts of filler, 44.8 parts of plasticizer, 2.1 parts of stabilizer, and 2 parts of flame retardant.

[0063] The filler is calcium carbonate powder, and the mesh number of the calcium carbonate powder is 2000 meshes.

[0064] The plasticizers are dioctyl phthalate and epoxidized soybean oil.

[0065] The mass ratio of dioctyl phthalate to epoxidized soybean oil is 21.4:1.

[0066] The stabilizer is a liquid barium zinc stabilizer and a powdered calcium zinc stabilizer.

[0067] The mass ratio of the liquid barium zinc stabilizer to the powdered calcium zinc stabilizer is 1.6:0.5.

[0068] The flame retardants are zinc borate and aluminum hydroxide.

[0069] The mass ratio of the zinc borate to the aluminum hydroxide is 1:1.

[0070] The second aspect of the present embodiment provides a method for preparing a PVC flame retardant film, comprising the following steps: mixing PVC resin powder, filler, plasticizer, stabilizer, and flame retardant, and subjecting the mixture to pre-plasticization, plasticizing, calendering, cooling, cutting, and winding.

[0071] Example 5

[0072] In a first aspect, the present embodiment provides a PVC flame retardant film, wherein the raw materials for preparing the film include, by weight: 100 parts of PVC resin powder, 35 parts of filler, 44.8 parts of plasticizer, 2.1 parts of stabilizer, and 3 parts of flame retardant.

[0073] The filler is calcium carbonate powder, and the mesh number of the calcium carbonate powder is 2000 meshes.

[0074] The plasticizers are dioctyl phthalate and epoxidized soybean oil.

[0075] The mass ratio of dioctyl phthalate to epoxidized soybean oil is 21.4:1.

[0076] The stabilizer is a liquid barium zinc stabilizer and a powdered calcium zinc stabilizer.

[0077] The mass ratio of the liquid barium zinc stabilizer to the powdered calcium zinc stabilizer is 1.6:0.5.

[0078] The flame retardants are antimony trioxide and aluminum hydroxide.

[0079] The mass ratio of antimony trioxide to aluminum hydroxide is 1:2.

[0080] The second aspect of the present embodiment provides a method for preparing a PVC flame retardant film, comprising the following steps: mixing PVC resin powder, filler, plasticizer, stabilizer, and flame retardant, and subjecting the mixture to pre-plasticization, plasticizing, calendering, cooling, cutting, and winding.

[0081] Example 6

[0082] In a first aspect, the present embodiment provides a PVC flame retardant film, wherein the raw materials for preparing the film include, by weight: 100 parts of PVC resin powder, 35 parts of filler, 44.8 parts of plasticizer, 2.1 parts of stabilizer, and 2 parts of flame retardant.

[0083] The filler is calcium carbonate powder, and the mesh number of the calcium carbonate powder is 2000 meshes.

[0084] The plasticizers are dioctyl phthalate and epoxidized soybean oil.

[0085] The mass ratio of dioctyl phthalate to epoxidized soybean oil is 21.4:1.

[0086] The stabilizer is a liquid barium zinc stabilizer and a powdered calcium zinc stabilizer.

[0087] The mass ratio of the liquid barium zinc stabilizer to the powdered calcium zinc stabilizer is 1.6:0.5.

[0088] The flame retardants are antimony trioxide and aluminum hydroxide.

[0089] The mass ratio of antimony trioxide to aluminum hydroxide is 1:1.

[0090] The second aspect of the present embodiment provides a method for preparing a PVC flame retardant film, comprising the following steps: mixing PVC resin powder, filler, plasticizer, stabilizer, and flame retardant, and subjecting the mixture to pre-plasticization, plasticizing, calendering, cooling, cutting, and winding.

[0091] Example 7

[0092] This embodiment is basically the same as Embodiment 5, except that the flame retardant is a composition of antimony trioxide and Yuxing composite flame retardant (YT-III), and the mass ratio of antimony trioxide to Yuxing composite flame retardant is 1:2.

[0093] Performance Testing

[0094] 1. Flame retardant properties: The flame retardant properties of the samples obtained in Examples 1 to 6 were tested according to GB / T 15903-1995. The flame retardant grade classification standard is shown in Table 1:

[0095] Table 1

[0096] Flame resistance grade Average burning length (mm) illustrate Level 0 Burn length = 0 Non-flammable (the ignition material burns out, but the sample does not burn) Level 1 0 < Combustion length ≤ 50 Self-extinguishing, good flame resistance Level 2 50 < burning length ≤ 150 Flammable, poor flame resistance Level 3 Burning length>150 flammable

[0097] The test results are shown in Table 2:

[0098] Table 2

[0099]

[0100]

[0101] 2. Conformity: The conformity test was conducted on the samples obtained in Example 5 and Example 7. The wires were visually and intuitively evaluated to see whether they were flat, straight, and had little deformation after winding. The test results were as follows: Figure 1 , Figure 2 shown.

[0102] from Figure 1 and 2 It can be seen that the tape wrapping conformity of the PVC film prepared by the present invention is better than that of the PVC film prepared by the Yuxing composite flame retardant.

[0103] 3. Thermal shrinkage rate: Test conditions: Test heating temperature is 100° C., and the test time is 60 min. The samples obtained in Example 5 and Example 7 were tested for thermal shrinkage rate, and each sample was tested three times. The results are shown in Table 3.

[0104] Table 3

[0105]

Claims

1. A PVC flame retardant film, characterized in that: The raw materials for its preparation include, by weight: 95-110 parts of PVC resin powder, 32-38 parts of filler, 40-50 parts of plasticizer, 2-3 parts of stabilizer, and 2-3 parts of flame retardant.

2. The PVC flame retardant film according to claim 1, characterized in that: The plasticizer includes one or more of dioctyl phthalate, diisononyl phthalate, dioctyl terephthalate, and epoxidized soybean oil.

3. The PVC flame retardant film according to claim 2, characterized in that: The mass ratio of dioctyl phthalate to epoxidized soybean oil in the plasticizer is (20-22):

1.

4. The PVC flame retardant film according to claim 1, characterized in that: The stabilizer includes one or both of a liquid stabilizer and a powder stabilizer.

5. The PVC flame retardant film according to claim 4, characterized in that: The mass ratio of the liquid stabilizer to the powder stabilizer is (1.6-1.7): (0.5-0.6).

6. The PVC flame retardant film according to claim 4, characterized in that: The liquid stabilizer includes one or both of a liquid barium zinc stabilizer and a liquid calcium zinc stabilizer.

7. The PVC flame retardant film according to claim 4, characterized in that: The powder stabilizer includes one or both of powder barium zinc stabilizer and powder calcium zinc stabilizer.

8. The PVC flame retardant film according to claim 1, characterized in that: The flame retardant includes one or more of antimony trioxide, zinc borate, aluminum hydroxide, and magnesium hydroxide.

9. The PVC flame retardant film according to claim 8, characterized in that: The mass ratio of antimony trioxide to aluminum hydroxide in the flame retardant is 1:(1-2).

10. A method for preparing a PVC flame retardant film according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: mixing PVC resin powder, filler, plasticizer, stabilizer and flame retardant, and then subjecting the mixture to pre-plasticization, plasticizing and plasticizing, calendering, cooling, cutting and coiling to obtain the product.

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