Non-swelling environment-friendly synthetic leather with water resistance and moisture permeability

Abstract

The invention provides non-swelling environment-friendly synthetic leather with water resistance and moisture permeability, and relates to the technical field of synthetic leather. The non-swelling environment-friendly synthetic leather with waterproof and moisture permeable properties is prepared from the following components: 49 to 50 percent of polyurethane, 30 to 50 percent of polyvinyl chloride, 0 to 0.05 percent of short-chain chlorinated paraffin, 0 to 0.05 percent of diisobutyl phthalate, 0 to 0.05 percent of tris (2-chloroethyl) phosphate, 0 to 0.05 percent of acrylamide, 0 to 0.05 percent of trichloroethylene, 0 to 0.05 percent of ethylene glycol monomethyl ether and the balance of water. By optimizing the raw material ratio and the processing technology, the moisture permeability of the synthetic leather is larger than or equal to 2500g / m < 2 >. 24H, the hydrostatic pressure is larger than or equal to 9000mm, and the synthetic leather has good waterproof and moisture-permeable performance and can meet the requirements of different application scenes; and secondly, the leather surface of the processed finished product has no rugged phenomenon after meeting water, namely the finished product has a non-swelling characteristic, so that the swelling of the leather surface caused by water absorption is avoided, the stability of the synthetic leather is improved, and the service life of the synthetic leather is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of synthetic leather, in particular to a non-swelling environmentally friendly synthetic leather with waterproof and moisture permeability. Background Art

[0002] Synthetic leather is a plastic product that simulates the composition and structure of natural leather and can be used as a substitute material. It is usually made of impregnated non-woven fabric as the mesh layer and microporous polyurethane layer as the grain layer. Both its front and back sides are very similar to leather and have a certain degree of air permeability. It is closer to natural leather than ordinary artificial leather. It is widely used in the production of shoes, boots, bags and balls, etc.

[0003] With the improvement of people's living standards and the enhancement of environmental awareness, the performance and environmental protection requirements of synthetic leather are getting higher and higher. Traditional synthetic leather has many shortcomings in terms of waterproof and breathable performance and environmental protection indicators. For example, some synthetic leathers are prone to swelling after contact with water, resulting in uneven leather surface, affecting the appearance and performance; at the same time, some synthetic leathers use a large number of environmentally harmful chemicals in the production process, such as short-chain chlorinated paraffin, diisobutyl phthalate, tris (2-chloroethyl) phosphate, acrylamide, trichloroethylene, ethylene glycol monomethyl ether, etc. The excessive use of these substances not only pollutes the environment, but also may cause potential harm to human health. Therefore, it is of great practical significance to develop a synthetic leather that has good waterproof and breathable performance, meets environmental protection requirements and does not swell. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the prior art, the present invention provides a non-swelling environmentally friendly synthetic leather with waterproof and moisture permeability, which solves the problems raised by the above-mentioned background technology.

[0006] (II) Technical solution

[0007] To achieve the above purpose, the present invention is implemented by the following technical scheme: a non-swelling environmentally friendly synthetic leather with waterproof and moisture permeability, comprising the following components: 49-50% of polyurethane, 30-50% of polyvinyl chloride, 0-0.05% of short-chain chlorinated paraffin, 0-0.05% of diisobutyl phthalate, 0-0.05% of tris(2-chloroethyl)phosphate, 0-0.05% of acrylamide, 0-0.05% of trichloroethylene, 0-0.05% of ethylene glycol monomethyl ether and the remainder of water.

[0008] Preferably, the non-swelling environmentally friendly synthetic leather with waterproof and moisture permeability includes the following ingredients: 50% polyurethane, 45% polyvinyl chloride, 0.05% short-chain chlorinated paraffin, 0.05% diisobutyl phthalate, 0.05% tri(2-chloroethyl) phosphate, 0.05% acrylamide, 0.05% trichloroethylene, 0.05% ethylene glycol monomethyl ether and the remainder water.

[0009] The present invention further discloses a method for preparing the synthetic leather, comprising the following steps:

[0010] Step 1: Raw material preparation:

[0011] Mixing polyurethane, polyvinyl chloride, short-chain chlorinated paraffin, diisobutyl phthalate, tri(2-chloroethyl) phosphate, acrylamide, trichloroethylene and ethylene glycol monomethyl ether in a predetermined ratio, and stirring them fully in a stirrer to uniformly mix the components;

[0012] Step 2: High temperature extrusion:

[0013] The mixed material is extruded through an extruder to form a continuous film material;

[0014] Step 3: Stretch and shape:

[0015] Stretching and shaping the extruded film material to obtain the desired thickness and size;

[0016] Step 4: Surface treatment:

[0017] The formed membrane material is surface treated to improve its waterproof and moisture permeability;

[0018] Step 5: Reprocessing:

[0019] The treated membrane material is cut and sewn to produce a final waterproof and breathable non-swelling environmentally friendly synthetic leather product.

[0020] Preferably, in step 1, the agitator first stirs at a low speed of 200-400 r / min for 15-30 min, and then stirs at a high speed of 1000-1500 r / min for 45-90 min.

[0021] Preferably, in step 2, the temperature of the extruder is 200-250° C., and the extrusion speed of the extruder is 20-50 m / min.

[0022] Preferably, in step three, during the stretching and shaping process, the stretching speed is 10-30 m / min, and the stretching temperature is 80-120°C.

[0023] Preferably, in step 4, the surface treatment is carried out by a chemical method, that is, by coating a waterproofing agent, the waterproofing agent is evenly coated on the surface of the membrane material to form a dense waterproof layer.

[0024] Preferably, in step 4, the surface treatment adopts a physical method, that is, plasma treatment or microporous technology is used to change the microstructure of the surface of the membrane material.

[0025] (III) Beneficial effects

[0026] The present invention provides a non-swelling environmentally friendly synthetic leather with waterproof and moisture permeability, which has the following beneficial effects:

[0027] 1. Excellent waterproof and breathable performance: The present invention optimizes the raw material ratio and processing technology to make the moisture permeability of synthetic leather ≥2500g / m2·24H and the hydrostatic pressure ≥9000mm. It has good waterproof and breathable performance and can meet the needs of different application scenarios, such as outdoor clothing, footwear and other products.

[0028] 2. Non-swelling property: The finished product has no uneven surface after contact with water, which means it has non-swelling property. This is because a series of measures are taken in the raw material ratio and processing process to avoid swelling of the leather surface caused by water absorption, thus improving the stability and service life of the synthetic leather. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a schematic diagram of the process of preparing synthetic leather. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Embodiment 1:

[0032] The embodiment of the present invention provides a non-swelling environmentally friendly synthetic leather with waterproof and moisture permeability, including the following ingredients: 50% polyurethane, 30% polyvinyl chloride, 0.01% short-chain chlorinated paraffin (C10-C13), 0.01% diisobutyl phthalate, 0.01% tri(2-chloroethyl) phosphate, 0.01% acrylamide, 0.01% trichloroethylene, 0.01% ethylene glycol monomethyl ether and the remainder water.

[0033] like Figure 1As shown, the embodiment of the present invention also provides a method for preparing the non-swelling environmentally friendly synthetic leather with waterproof and moisture permeability, comprising the following steps:

[0034] Step 1: Raw material preparation:

[0035] Polyurethane, polyvinyl chloride, short-chain chlorinated paraffin, diisobutyl phthalate, tri(2-chloroethyl) phosphate, acrylamide, trichloroethylene and ethylene glycol monomethyl ether are mixed in a predetermined ratio and fully stirred in a stirrer. The stirrer is first stirred at a low speed of 200 r / min for 15 minutes and then stirred at a high speed of 1000 r / min for 45 minutes to uniformly mix the components.

[0036] Step 2: High temperature extrusion:

[0037] The mixed material is extruded through an extruder, the temperature of the extruder is 200° C., and the extrusion speed of the extruder is 20 m / min, to form a continuous film material;

[0038] Step 3: Stretch and shape:

[0039] The extruded film material is stretched and shaped, wherein the stretching speed is 10 m / min and the stretching temperature is 80° C. to obtain the desired thickness and size;

[0040] Step 4: Surface treatment:

[0041] The shaped membrane material is subjected to surface treatment, wherein the surface treatment adopts a chemical method, that is, a waterproofing agent is applied to the surface of the membrane material to form a dense waterproof layer to improve its waterproof performance;

[0042] Step 5: Reprocessing:

[0043] The treated membrane material is cut and sewn to produce a final waterproof and breathable non-swelling environmentally friendly synthetic leather product.

[0044] Embodiment 2:

[0045] The difference between this embodiment and the first embodiment is that in the method for preparing the non-swollen environmentally friendly synthetic leather with waterproof and moisture permeability, in step four, the shaped film material is surface treated, and the surface treatment adopts a physical method, that is, through plasma treatment or microporous technology, the microstructure of the surface of the film material is changed to improve its moisture permeability.

[0046] Embodiment three:

[0047] The embodiment of the present invention provides a non-swelling environmentally friendly synthetic leather with waterproof and moisture permeability, including the following ingredients: 50% polyurethane, 40% polyvinyl chloride, 0.03% short-chain chlorinated paraffin (C10-C13), 0.03% diisobutyl phthalate, 0.03% tri(2-chloroethyl) phosphate, 0.03% acrylamide, 0.03% trichloroethylene, 0.03% ethylene glycol monomethyl ether and the remainder water.

[0048] like Figure 1 As shown, the embodiment of the present invention also provides a method for preparing the non-swelling environmentally friendly synthetic leather with waterproof and moisture permeability, comprising the following steps:

[0049] Step 1: Raw material preparation:

[0050] Polyurethane, polyvinyl chloride, short-chain chlorinated paraffin, diisobutyl phthalate, tri(2-chloroethyl) phosphate, acrylamide, trichloroethylene and ethylene glycol monomethyl ether are mixed in a predetermined ratio and fully stirred in a stirrer, first at a low speed of 300 r / min for 20 min, and then at a high speed of 1200 r / min for 70 min, so that the components are evenly mixed;

[0051] Step 2: High temperature extrusion:

[0052] Extruding the mixed material through an extruder, wherein the temperature of the extruder is 230° C. and the extrusion speed of the extruder is 40 m / min, to form a continuous film-like material;

[0053] Step 3: Stretch and shape:

[0054] The extruded film material is stretched and shaped, wherein the stretching speed is 20 m / min and the stretching temperature is 100° C. to obtain the desired thickness and size;

[0055] Step 4: Surface treatment:

[0056] The shaped membrane material is subjected to surface treatment, wherein the surface treatment adopts a chemical method, that is, a waterproofing agent is applied to the surface of the membrane material to form a dense waterproof layer to improve its waterproof performance;

[0057] Step 5: Reprocessing:

[0058] The treated membrane material is cut and sewn to produce a final waterproof and breathable non-swelling environmentally friendly synthetic leather product.

[0059] Embodiment 4:

[0060] The difference between this embodiment and the third embodiment is that in the method for preparing the non-swollen environmentally friendly synthetic leather with waterproof and moisture permeability, in step four, the shaped film material is surface treated, and the surface treatment adopts a physical method, that is, through plasma treatment or microporous technology, the microstructure of the surface of the film material is changed to improve its moisture permeability.

[0061] Embodiment five:

[0062] The embodiment of the present invention provides a non-swelling environmentally friendly synthetic leather with waterproof and moisture permeability, including the following ingredients: 50% polyurethane, 45% polyvinyl chloride, 0.05% short-chain chlorinated paraffin (C10-C13), 0.05% diisobutyl phthalate, 0.05% tris(2-chloroethyl) phosphate, 0.05% acrylamide, 0.05% trichloroethane, 0.05% ethylene glycol monomethyl ether and the remainder water.

[0063] like Figure 1 As shown, the embodiment of the present invention also provides a method for preparing the non-swelling environmentally friendly synthetic leather with waterproof and moisture permeability, comprising the following steps:

[0064] Step 1: Raw material preparation:

[0065] Polyurethane, polyvinyl chloride, short-chain chlorinated paraffin, diisobutyl phthalate, tri(2-chloroethyl) phosphate, acrylamide, trichloroethylene and ethylene glycol monomethyl ether are mixed in a predetermined ratio and fully stirred in a stirrer. The stirrer is first stirred at a low speed of 400 r / min for 30 minutes and then stirred at a high speed of 1500 r / min for 90 minutes to uniformly mix the components.

[0066] Step 2: High temperature extrusion:

[0067] Extruding the mixed material through an extruder, wherein the temperature of the extruder is 250° C. and the extrusion speed of the extruder is 50 m / min, to form a continuous film-like material;

[0068] Step 3: Stretch and shape:

[0069] The extruded film material is stretched and shaped, wherein the stretching speed is 30 m / min and the stretching temperature is 120° C. to obtain the desired thickness and size;

[0070] Step 4: Surface treatment:

[0071] The shaped membrane material is subjected to surface treatment, wherein the surface treatment adopts a chemical method, that is, a waterproofing agent is applied to the surface of the membrane material to form a dense waterproof layer to improve its waterproof performance;

[0072] Step 5: Reprocessing:

[0073] The treated membrane material is cut and sewn to produce a final waterproof and breathable non-swelling environmentally friendly synthetic leather product.

[0074] Embodiment six:

[0075] The difference between this embodiment and embodiment 5 is that in the method for preparing the non-swollen environmentally friendly synthetic leather with waterproof and moisture permeability, in step 4, the shaped film material is surface treated, and the surface treatment adopts a physical method, that is, through plasma treatment or microporous technology, the microstructure of the surface of the film material is changed to improve its moisture permeability.

[0076] Comparative Example 1:

[0077] A synthetic leather comprises the following ingredients: 50% polyurethane, 40% polyvinyl chloride and the balance water.

[0078] The method for preparing the synthetic leather comprises the following steps:

[0079] Step 1: Raw material preparation:

[0080] The polyurethane, polyvinyl chloride and water are mixed in a predetermined ratio and fully stirred in a stirrer. The stirrer is first stirred at a low speed of 200 r / min for 15 minutes, and then stirred at a high speed of 1000 r / min for 45 minutes to make the components evenly mixed;

[0081] Step 2: High temperature extrusion:

[0082] The mixed material is extruded through an extruder, the temperature of the extruder is 200° C., and the extrusion speed of the extruder is 20 m / min, to form a continuous film material;

[0083] Step 3: Stretch and shape:

[0084] The extruded film material is stretched and shaped, wherein the stretching speed is 10 m / min and the stretching temperature is 80° C. to obtain the desired thickness and size;

[0085] Step 4: Surface treatment:

[0086] The shaped membrane material is subjected to surface treatment, wherein the surface treatment adopts a chemical method, that is, a waterproofing agent is applied to the surface of the membrane material to form a dense waterproof layer to improve its waterproof performance;

[0087] Step 5: Reprocessing:

[0088] The treated membrane material is cut and sewn to produce a final waterproof and breathable non-swelling environmentally friendly synthetic leather product.

[0089] Comparative Example 2:

[0090] The difference between this comparative example and comparative example 1 is that step 4 is removed.

[0091] Experimental example:

[0092] The performance of the synthetic leather products prepared in Examples 1, 2, 3, 4, 5, 6 and Comparative Examples 1 and 2 was tested, and the results are shown in the following table:

[0093]

[0094] In summary, the non-swelling environmentally friendly synthetic leather with waterproof and moisture permeability prepared by the present invention not only has excellent waterproof performance, but also has significantly improved moisture permeability. This is mainly due to our carefully designed preparation method and component ratio. In Examples 1 and 2 (or Examples 3 and 4 or Examples 5 and 6), we tried chemical and physical surface treatment methods respectively, and all achieved good results. In particular, physical methods, such as plasma treatment or microporous technology, can significantly improve its moisture permeability without changing the original structure of the material.

[0095] In the experimental example section, we compared the performance of synthetic leather products prepared in different embodiments and comparative examples. The results show that the synthetic leather prepared by the present invention performs well in key indicators such as moisture permeability and hydrostatic pressure, and the leather surface is smooth after contacting water without unevenness, which fully proves the effectiveness and superiority of the present invention.

[0096] In summary, the present invention provides a non-swelling environmentally friendly synthetic leather with waterproof and moisture permeability and a preparation method thereof. The synthetic leather not only has excellent waterproof performance, but also has good moisture permeability, and the preparation process is simple, the cost is low, and it has broad application prospects.

[0097] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A non-swelling environmentally friendly synthetic leather with waterproof and moisture permeability, characterized by: The invention comprises the following ingredients: 49-50% of polyurethane, 30-50% of polyvinyl chloride, 0-0.05% of short-chain chlorinated paraffin, 0-0.05% of diisobutyl phthalate, 0-0.05% of tri(2-chloroethyl) phosphate, 0-0.05% of acrylamide, 0-0.05% of trichloroethylene, 0-0.05% of ethylene glycol monomethyl ether and the balance of water.

2. The non-swelling environmentally friendly synthetic leather with waterproof and moisture permeability according to claim 1, characterized in that: The invention comprises the following ingredients: 50% of polyurethane, 45% of polyvinyl chloride, 0.05% of short-chain chlorinated paraffin, 0.05% of diisobutyl phthalate, 0.05% of tri(2-chloroethyl) phosphate, 0.05% of acrylamide, 0.05% of trichloroethylene, 0.05% of ethylene glycol monomethyl ether and the balance of water.

3. The non-swelling environmentally friendly synthetic leather with waterproof and moisture permeability according to claim 1 or 2, characterized in that: The method for preparing the synthetic leather comprises the following steps: Step 1: Raw material preparation: Mixing polyurethane, polyvinyl chloride, short-chain chlorinated paraffin, diisobutyl phthalate, tri(2-chloroethyl) phosphate, acrylamide, trichloroethylene and ethylene glycol monomethyl ether in a predetermined ratio, and stirring them fully in a stirrer to uniformly mix the components; Step 2: High temperature extrusion: The mixed material is extruded through an extruder to form a continuous film material; Step 3: Stretch and shape: Stretching and shaping the extruded film material to obtain the desired thickness and size; Step 4: Surface treatment: The formed membrane material is surface treated to improve its waterproof and moisture permeability; Step 5: Reprocessing: The treated membrane material is cut and sewn to produce a final waterproof and breathable non-swelling environmentally friendly synthetic leather product.

4. The non-swelling environmentally friendly synthetic leather with waterproof and moisture permeability according to claim 3, characterized in that: In step 1, the stirrer first stirs at a low speed of 200-400 r / min for 15-30 min, and then stirs at a high speed of 1000-1500 r / min for 45-90 min.

5. The non-swelling environmentally friendly synthetic leather with waterproof and moisture permeability according to claim 3, characterized in that: In step 2, the temperature of the extruder is 200-250° C., and the extrusion speed of the extruder is 20-50 m / min.

6. The non-swelling environmentally friendly synthetic leather with waterproof and moisture permeability according to claim 3, characterized in that: In step three, during the stretching and shaping process, the stretching speed is 10-30 m / min, and the stretching temperature is 80-120°C.

7. The non-swelling environmentally friendly synthetic leather with waterproof and moisture permeability according to claim 3, characterized in that: In step 4, the surface treatment is carried out by a chemical method, that is, by coating a waterproofing agent, the waterproofing agent is evenly coated on the surface of the membrane material to form a dense waterproof layer.

8. The non-swelling environmentally friendly synthetic leather with waterproof and moisture permeability according to claim 3, characterized in that: In step 4, the surface treatment adopts a physical method, that is, plasma treatment or microporous technology is used to change the microstructure of the surface of the membrane material.

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