Environment-friendly copolymer artificial leather and preparation process thereof

Abstract

The invention discloses environment-friendly copolymer artificial leather, which belongs to the field of automotive interior materials and sequentially comprises a base cloth layer, a foaming layer and a wear-resistant skin-friendly surface layer. The wear-resistant skin-friendly surface layer is of a double-polymerization-degree PVC resin structure and is prepared from the following components in parts by mass: 50-60 parts of high-polymerization-degree resin; 25 to 30 parts of low polymerization degree resin; 4-8 parts of natural oil; 10 to 16 parts of nano silicon dioxide dispersion liquid; 1-3 parts of an antioxidant; 5 to 9 parts of decabromodiphenyl ethane; and 4 to 6 parts of antimony trioxide. The PVC resin with double polymerization degrees is blended, so that the mechanical strength and the flexibility are balanced. Natural vegetable fat is introduced to replace part of plasticizer, and volatile substances are reduced. The nano silicon dioxide dispersion liquid is added, so that the interface bonding force is enhanced, and the wear resistance is improved.

Description

Technical Field

[0001] The invention belongs to the field of automobile interior materials, and specifically relates to an environment-friendly copolymer artificial leather having softness, skin affinity and environmental protection performance and a preparation method thereof. Background Art

[0002] Existing PVC artificial leather for cars has the following defects: Poor skin affinity: The surface is rough and hard to the touch, and it is easy to produce friction when in contact with the skin. Insufficient softness: Plasticizers are used to improve softness, but excessive plasticizers are easy to volatilize and cause the material to harden. Low environmental protection: Traditional plasticizers (such as phthalates) release harmful substances such as formaldehyde, and the VOC in the car exceeds the standard. Poor durability: The surface is easy to wear after long-term use, the touch is reduced, and partial or large-area aging will occur after a short period of use.

[0003] As consumers pay more attention to a healthy driving environment, it has become an industry trend to develop soft, skin-friendly, low-VOC, environmentally friendly PVC artificial leather with excellent wear resistance. Summary of the invention

[0004] Aiming at the problems existing in the prior art, the present invention discloses an environmentally friendly copolymer artificial leather and a preparation process thereof, adopts a sandwich structure of a base fabric layer + a foaming layer + a wear-resistant skin-friendly surface layer, and improves the defects existing in the prior art.

[0005] The present invention is achieved in that:

[0006] An environmentally friendly copolymer artificial leather, characterized in that the environmentally friendly copolymer artificial leather comprises a base fabric layer, a foaming layer, and a wear-resistant skin-friendly surface layer in sequence;

[0007] The wear-resistant and skin-friendly surface layer is a dual-polymerization PVC resin structure prepared from the following components in parts by mass:

[0008] High polymerization degree resin: 50-60 parts;

[0009] Low polymerization degree resin: 25-30 parts;

[0010] Natural oils: 4-8 parts;

[0011] Nano-silicon dioxide dispersion: 10-16 parts;

[0012] Antioxidant: 1-3 parts;

[0013] Decabromodiphenylethane: 5-9 parts;

[0014] Antimony trioxide: 4 to 6 parts.

[0015] Furthermore, the polymerization degree of the high-polymerization-degree resin is ≥2500, and the polymerization degree of the low-polymerization-degree resin is ≤1500.

[0016] Further, by mass parts, the natural oil is a mixture of jojoba oil and castor oil in a ratio of 1:1, and is dehydrated under vacuum at 60°C for 2 hours.

[0017] Further, the base fabric layer is a polyester warp knitted fabric coated with waterborne polyurethane on both sides.

[0018] Further, the coating process of the base fabric layer is as follows: the reverse coating method is adopted, the coating amount is 1.5 ± 0.1 mm, and the pre-curing temperature is 120°C × 5 min.

[0019] Further, by mass parts, the antioxidant is BHT.

[0020] Further, by mass parts, the mass ratio of the high-polymerization-degree resin to the low-polymerization-degree resin is 2:1.

[0021] A preparation method of an environment-friendly copolymer artificial leather, characterized in that the method is as follows:

[0022] Step 1, PVC resin blending: Blend high-polymerization-degree resin (50 - 60 parts) and low-polymerization-degree resin (25 - 30 parts) in a mass ratio of 2:1, add antioxidant (BHT) 1 - 3 parts, and stir at high speed for 30 min;

[0023] Step 2, Mix jojoba oil and castor oil, and after dehydrating under vacuum at 60°C for 2 hours to form natural oil, weigh 4 - 8 parts of the above natural oil, and add it to the PVC resin blend in Step 1;

[0024] Step 3, Add 10 - 16 parts of nano-silica dispersion liquid, 5 - 9 parts of decabromodiphenyl ethane, and 4 - 6 parts of antimony trioxide to the mixture in Step 2, grind with a three-roll mill for 3 times, and the fineness ≤ 30 μm to form a wear-resistant and skin-friendly surface layer with a double-polymerization-degree PVC resin structure;

[0025] Step 4: Base fabric preparation: Base fabric selection: The base fabric layer is a polyester warp knitted fabric coated with waterborne polyurethane on both sides, adopt the reverse coating method, the coating amount is 1.5 ± 0.1 mm, and the pre-curing temperature is 120°C × 5 min;

[0026] Step 5: Plasma surface treatment of the wear-resistant and skin-friendly surface layer with a double-polymerization-degree PVC resin structure: power 80 W, treatment time 60 s;

[0027] Step 6: Vacuum negative pressure forming of the base fabric layer - foaming layer - wear-resistant and skin-friendly surface layer: mold temperature 70°C, vacuum degree -0.09 MPa, pressure holding for 20 min.

[0028] The beneficial effects of the present invention compared with the prior art are as follows:

[0029] The copolymer formed by blending PVC resins with double degrees of polymerization (high-degree polymerization resin ≥ 2500, low-degree polymerization resin ≤ 1500) is adopted in the present invention to balance the mechanical strength and flexibility. Natural plant oil (jojoba oil) is introduced to replace part of the plasticizer to reduce volatile substances. Nano-silica dispersion liquid is added to enhance the interfacial bonding force and improve wear resistance. Detailed implementation manners

[0030] To make the purpose, technical solutions and effects of the present invention clearer and more definite, the following examples are listed to further elaborate on the present invention in detail. It should be noted that the specific implementations described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] Example 1

[0032] A preparation method of an environment-friendly copolymer artificial leather in this example is characterized in that the method is as follows:

[0033] Step 1: PVC resin blending: Blend high-degree polymerization resin (60 parts) and low-degree polymerization resin (30 parts) according to a mass ratio of 2:1, add 1 - 3 parts of antioxidant (BHT), and stir at high speed for 30 min; the degree of polymerization of the high-degree polymerization resin ≥ 2500, and the degree of polymerization of the low-degree polymerization resin ≤ 1500. The mass ratio of the high-degree polymerization resin to the low-degree polymerization resin is 2:1.

[0034] Step 2: Mix jojoba oil and castor oil, dehydrate in vacuum at 60 °C for 2 h to form natural oil, weigh 8 parts of the above natural oil, and add it to the PVC resin blend in Step 1;

[0035] Step 3: Add 16 parts of nano-silica dispersion liquid, 9 parts of decabromodiphenyl ethane, and 6 parts of antimony trioxide to the mixture in Step 2, grind with a three-roll grinder for 3 times, and the fineness ≤ 30 μm to form a wear-resistant and skin-friendly surface layer with a double-degree polymerization PVC resin structure;

[0036] Step 4: Substrate preparation: Substrate selection: The substrate layer adopts a polyester warp-knitted fabric with double-sided coated waterborne polyurethane, and the reverse coating method is used, with a coating amount of 1.5 ± 0.1 mm and a pre-curing temperature of 120 °C × 5 min;

[0037] Step 5: Plasma surface treatment of the wear-resistant and skin-friendly surface layer with a double-degree polymerization PVC resin structure: The power is 80 W and the treatment time is 60 s;

[0038] Step 6: Vacuum negative pressure forming of the substrate layer - foaming layer - wear-resistant and skin-friendly surface layer: The mold temperature is 70 °C, the vacuum degree is -0.09 MPa, and the pressure is maintained for 20 min.

[0039] Example 2

[0040] A preparation method of an environmentally friendly copolymer artificial leather according to this embodiment is characterized in that the method is as follows:

[0041] Step 1, PVC resin blending: Blend high-polymerization-degree resin (50 parts) and low-polymerization-degree resin (25 parts) according to a mass ratio of 2:1, add 1 part of antioxidant (BHT), and stir at high speed for 30 min; the polymerization degree of the high-polymerization-degree resin is ≥2500, and the polymerization degree of the low-polymerization-degree resin is ≤1500. The mass ratio of the high-polymerization-degree resin to the low-polymerization-degree resin is 2:1.

[0042] Step 2, Mix jojoba oil and castor oil, dehydrate in vacuum at 60 °C for 2 h to form natural oil, weigh 4 - 8 parts of the above natural oil, and add it to the PVC resin blend in Step 1;

[0043] Step 3, Add 10 parts of nano-silica dispersion liquid, 5 parts of decabromodiphenylethane, and 4 parts of antimony trioxide to the mixture in Step 2, grind with a three-roll grinder for 3 times, and the fineness is ≤30 μm to form a wear-resistant and skin-friendly surface layer with a double-polymerization-degree PVC resin structure;

[0044] Step 4: Substrate preparation: Substrate selection: The substrate layer uses a polyester warp-knitted fabric with double-sided coated waterborne polyurethane. The reverse coating method is adopted, the coating amount is 1.5 ± 0.1 mm, and the pre-curing temperature is 120 °C × 5 min;

[0045] Step 5: Plasma surface treatment of the wear-resistant and skin-friendly surface layer with a double-polymerization-degree PVC resin structure: The power is 80 W, and the treatment time is 60 s;

[0046] Step 6: Vacuum negative pressure forming of the substrate layer - foaming layer - wear-resistant and skin-friendly surface layer: The mold temperature is 70 °C, the vacuum degree is -0.09 MPa, and the pressure holding time is 20 min.

[0047] Example 3

[0048] A preparation method of an environmentally friendly copolymer artificial leather according to this embodiment is characterized in that the method is as follows:

[0049] Step 1, PVC resin blending: Blend high-polymerization-degree resin (56 parts) and low-polymerization-degree resin (28 parts) according to a mass ratio of 2:1, add 2 parts of antioxidant (BHT), and stir at high speed for 30 min; the polymerization degree of the high-polymerization-degree resin is ≥2500, and the polymerization degree of the low-polymerization-degree resin is ≤1500. The mass ratio of the high-polymerization-degree resin to the low-polymerization-degree resin is 2:1.

[0050] Step 2, Mix jojoba oil and castor oil, dehydrate in vacuum at 60 °C for 2 h to form natural oil, weigh 4 - 8 parts of the above natural oil, and add it to the PVC resin blend in Step 1;

[0051] Step 3: Add 15 parts of nano-silica dispersion, 8 parts of decabromodiphenylethane, and 5 parts of antimony trioxide into the mixture obtained in Step 2, and grind it 3 times with a three-roll grinder until the fineness is ≤ 30 μm to form a wear-resistant and skin-friendly surface layer with a double polymerization degree PVC resin structure;

[0052] Step 4: Substrate preparation: Substrate selection: The substrate layer uses a polyester warp-knitted fabric with waterborne polyurethane coated on both sides. The reverse coating method is adopted, the coating amount is 1.5 ± 0.1 mm, and the pre-curing temperature is 120 °C for 5 min;

[0053] Step 5: Plasma surface treatment of the wear-resistant and skin-friendly surface layer with a double polymerization degree PVC resin structure: The power is 80 W and the treatment time is 60 s;

[0054] Step 6: Vacuum negative pressure molding of the substrate layer - foaming layer - wear-resistant and skin-friendly surface layer: The mold temperature is 70 °C, the vacuum degree is -0.09 MPa, and the pressure holding time is 20 min.

[0055] Perform performance tests on the artificial leather formed by vacuum negative pressure molding in the above Example 3, and the results are as follows:

[0056]

[0057]

[0058] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements can still be made, and these improvements should also be regarded as the protection scope of the present invention.

Claims

1. An environmentally friendly copolymer artificial leather, characterized in that: The environmentally friendly copolymer artificial leather comprises a base fabric layer, a foaming layer and a wear-resistant skin-friendly surface layer in sequence; The wear-resistant and skin-friendly surface layer is a dual-polymerization PVC resin structure prepared from the following components in parts by mass: High polymerization degree resin: 50~60 parts; Low polymerization degree resin: 25~30 parts; Natural oils: 4-8 parts; Nano-silicon dioxide dispersion: 10-16 parts; Antioxidants: 1-3 parts; Decabromodiphenylethane: 5-9 parts; Antimony trioxide: 4~6 parts.

2. The environmentally friendly copolymer artificial leather according to claim 1, characterized in that: The polymerization degree of the high-polymerization-degree resin is ≥2500, and the polymerization degree of the low-polymerization-degree resin is ≤1500.

3. The environmentally friendly copolymer artificial leather according to claim 1, characterized in that: In terms of weight, the natural oil is a mixture of jojoba oil and castor oil in a ratio of 1:1, and is vacuum dehydrated at 60° C. for 2 h.

4. The environmentally friendly copolymer artificial leather according to claim 1, characterized in that: In terms of weight, the base fabric layer is made of polyester warp knitted fabric coated with water-based polyurethane on both sides.

5. The environmentally friendly copolymer artificial leather according to claim 1, characterized in that: According to the weight percentage, the base fabric layer coating process is: reverse coating method, coating amount 1.5±0.1mm, pre-curing temperature 120°C×5min.

6. The environmentally friendly copolymer artificial leather according to claim 1, characterized in that: In terms of parts by mass, the antioxidant is BHT.

7. The environmentally friendly copolymer artificial leather according to claim 1, characterized in that: Calculated by weight, the weight ratio of the high polymerization degree resin to the low polymerization degree resin is 2:

1.

8. A method for preparing an environmentally friendly copolymer artificial leather, characterized in that: The method described is: Step 1: PVC resin blending: Mix high-polymerization resin (50-60 parts) and low-polymerization resin (25-30 parts) at a mass ratio of 2:1, add 1-3 parts of antioxidant (BHT), and stir at high speed for 30 minutes; Step 2: Mix jojoba oil and castor oil, and dehydrate them under vacuum at 60° C. for 2 hours to form a natural oil. Weigh 4 to 8 parts of the natural oil and add them to the PVC resin blend of step 1. Step 3: Add 10-16 parts of nano-silicon dioxide dispersion, 5-9 parts of decabromodiphenylethane, and 4-6 parts of antimony trioxide to the mixture of step 2, and grind it three times with a three-roll grinder to a fineness of ≤30 μm to form a wear-resistant and skin-friendly surface layer of a dual-polymerization PVC resin structure; Step 4: Base fabric preparation: Base fabric selection: The base fabric layer is made of polyester warp knitted fabric coated with water-based polyurethane on both sides, using the reverse coating method, with a coating amount of 1.5±0.1mm and a pre-curing temperature of 120℃×5min; Step 5: Plasma surface treatment of the wear-resistant and skin-friendly surface of the dual-polymerization PVC resin structure: power 80W, treatment time 60s; Step 6: Vacuum negative pressure molding of base fabric layer - foaming layer - wear-resistant and skin-friendly surface layer: mold temperature 70°C, vacuum degree -0.09MPa, and pressure maintenance for 20 minutes.

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