Matt skin-touch material as well as preparation method and application thereof

Abstract

The invention discloses a matte skin-touch material as well as a preparation method and application thereof, and belongs to the technical field of plastic modification. The matte skin-touch material is obtained by carrying out physical blending modification on components, and the components comprise the following components in parts by weight: 0-20 parts of polyethylene, 20-60 parts of polypropylene, 40-70 parts of an elastomer and 0-5 parts of an auxiliary agent. The matte skin-touch material can be applied to forming of the double-layer extrusion-blowing bottle, and particularly applied as an outer layer raw material of the double-layer extrusion-blowing bottle. Through material modification, extra mold design or extra coating process after molding is not needed, and the manufactured finished product has a bottle body outer layer with low glossiness and skin feeling, and is soft and comfortable in holding hand feeling and good in friction hand feeling.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic modification, and in particular relates to a matte skin-feel material and a preparation method and application thereof. Background Art

[0002] As consumers' aesthetic demands continue to rise, users' requirements for products are no longer limited to internal functions, but have put forward more and higher requirements for product appearance. Under this trend, manufacturers have made a lot of upgrades to the aesthetics and comfort of product packaging. For example, in terms of packaging appearance, it is given richer colors, more unique gloss and more comfortable feel.

[0003] Matte and skin-feel effects on the surface are widely used in various products, such as cosmetic packaging bottles, electronic product shells, furniture surface decoration, etc. Take cosmetic packaging bottles as an example. After the bottle body adopts matte skin-feel effect, it can present a low-key and exquisite appearance visually. At the same time, when consumers hold the bottle, their hands can feel the soft touch, and its surface with appropriate friction can also give consumers a good tactile experience. This can greatly improve the user experience and enhance the product grade.

[0004] In order to achieve matte and skin-feel effects, polyurethane materials are commonly used, which are prepared by coating the surface with a curable polyurethane coating and then undergoing a curing process. During the curing process, the polyurethane coating layer will present a micro-nano concave-convex structure in the thickness direction, thereby forming a simulated texture and texture similar to human skin, and can also scatter incident light, thereby achieving matte and skin-feel effects, such as CN116004109A, CN113512315A, CN109266200A, CN118480307A, CN117511386A, etc. This surface micro-texture can also provide appropriate friction and provide a good touch.

[0005] However, this coating process has many inconveniences, such as complex material formula and process, and the need for an additional curing process for molding. In addition, there is currently no good material and technical solution for achieving matte and skin-feel effects for blow-molded products, especially bottle-shaped products. Summary of the invention

[0006] In order to solve the shortcomings and deficiencies of the prior art, the primary purpose of the present invention is to provide a matte skin-feeling material, which is obtained by physically blending and modifying the combined components, and the combined components include the following components by weight: 0-20 parts of polyethylene, 20-60 parts of polypropylene, 40-70 parts of elastomer, and 0.1-5 parts of additives. The modified material can achieve a matte and soft surface and a skin-feeling effect of appropriate friction through the synergy and ratio optimization of the components.

[0007] The second object of the present invention is to provide a method for preparing the above-mentioned matte skin-feel material, which can stably prepare the material.

[0008] The third object of the present invention is to provide the application of the above-mentioned matte skin-feel material in the molding of double-layer extrusion blow bottles, especially its application as the outer layer raw material of a double-layer extrusion blow bottle, which can make the finished product have a low-gloss, skin-feel outer bottle body, and the product feels soft to hold and has the comfort of appropriate friction.

[0009] The purpose of the present invention is achieved through the following technical solutions:

[0010] In a first aspect, the present invention provides a matte skin-feel material, wherein the matte skin-feel material comprises the following components in parts by weight:

[0011] 0-20 parts of polyethylene, 20-60 parts of polypropylene, 40-70 parts of elastomer, and 0-5 parts of additives.

[0012] The matte skin-feeling material of the present invention forms a low-gloss surface and a soft skin-feeling with appropriate friction due to the partial compatibility of polyethylene, polypropylene and elastomer.

[0013] Preferably, the matte skin-feel material comprises the following components in parts by weight:

[0014] 0-10 parts of polyethylene, 30-60 parts of polypropylene, 40-70 parts of elastomer, and 0.1-5 parts of additives.

[0015] Further preferably, the matte skin-feel material comprises the following components in parts by weight:

[0016] 0-5 parts of polyethylene, 40-60 parts of polypropylene, 40-60 parts of elastomer, and 0.5-2.5 parts of additives.

[0017] Preferably, the polyethylene is at least one of linear low-density polyethylene, low-density polyethylene and high-density polyethylene.

[0018] Preferably, the polyethylene is high-density polyethylene.

[0019] Preferably, the molecular weight of the polyethylene is 40,000-300,000.

[0020] Preferably, the polypropylene is block copolymer polypropylene.

[0021] Preferably, the molecular weight of the polypropylene is 100,000-500,000.

[0022] Preferably, the elastomer is at least one of a thermoplastic styrene elastomer, a thermoplastic polyolefin elastomer, a thermoplastic polyurethane elastomer and a synthetic rubber.

[0023] Further preferably, the elastomer is at least one of a thermoplastic styrene elastomer, a thermoplastic polyolefin elastomer and a synthetic rubber.

[0024] Further preferably, the thermoplastic styrene elastomer is styrene-butadiene-styrene (SBS) and / or styrene-ethylene / butylene-styrene block copolymer (SEBS) with a molecular weight of 100,000-700,000, wherein the mass percentage of butadiene in the styrene-butadiene-styrene block copolymer is 60-80%, and the styrene-ethylene / butylene-styrene block copolymer is obtained by hydrogenating the styrene-butadiene-styrene block copolymer with a hydrogenation rate of 90-99%.

[0025] More preferably, the thermoplastic polyolefin elastomer is a polyolefin elastomer (POE) with a molecular weight of 300,000-700,000, wherein the mass percentage of α-olefin is 20-40%.

[0026] More preferably, the synthetic rubber is ethylene propylene diene monomer (EPDM) with a molecular weight of 150,000-700,000, wherein the mass percentages of ethylene, propylene and non-conjugated diene in the EPDM are 60-80%, 15-35% and 3-8% respectively.

[0027] Preferably, the auxiliary agent is at least one of a dispersant and an antioxidant.

[0028] Further preferably, the auxiliary agent is a composition of 0-2 parts of dispersant and 0.5-1 parts of antioxidant in parts by weight.

[0029] Further preferably, the dispersant is at least one of amorphous solid paraffin, microcrystalline paraffin, liquid paraffin, polyethylene wax, oxidized polyethylene wax, ethylene-vinyl acetate copolymer wax, montan wax, polyester wax, ethylene bisstearamide, stearic acid, stearate and white oil.

[0030] Further preferably, the antioxidant is at least one of a hindered phenol antioxidant, a phosphite antioxidant, an amine antioxidant, a sulfur-containing antioxidant and a metal salt antioxidant.

[0031] More preferably, the dispersant is polyethylene wax and / or white oil.

[0032] More preferably, the antioxidant is antioxidant 1010 and / or antioxidant 168.

[0033] In a second aspect, the present invention provides a method for preparing the above-mentioned matte skin-feel material, comprising the following steps:

[0034] The polyethylene, polypropylene, elastomer and additives are mixed evenly, melt-extruded, dried, cooled and pelletized into a shape.

[0035] More preferably, the stirring speed for uniform mixing is 800-1200 r / min, and the stirring time is 3-5 min.

[0036] More preferably, the temperature of the melt extrusion is 180-210° C., the main engine speed is controlled at 250-450 rpm, and the screw speed is 300-350 rpm.

[0037] In a third aspect, the present invention provides application of the above-mentioned matte skin-feel material in double-layer extrusion blow bottle molding.

[0038] Preferably, the matte skin-feel material is added in an amount of 20-100 wt %.

[0039] Preferably, the matte skin-feel material is used as the outer layer material of a double-layer extrusion blow bottle.

[0040] Preferably, the application comprises the following steps:

[0041] The matte skin-feel material is added as the outer layer material into the outer layer screw hopper, and the extrusion blow-grade PP and / or HDPE material is added as the inner layer material into the inner layer screw hopper; the material blank is extruded, the thickness of the material blank is adjusted to be uniform, and the weight is set according to the product standard, and finally a matte skin-feel double-layer extrusion blow-blow bottle is formed.

[0042] The matte skin-feel double-layer extrusion blow bottle can be used as a daily chemical product packaging bottle, and is particularly suitable for high-end daily chemical product packaging bottles.

[0043] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0044] (1) The product made of the matte skin-feel material provided by the present invention has low gloss, soft skin feel, and fine friction touch;

[0045] (2) The matte skin-feel material provided by the present invention has a simple preparation process and is easy to mass produce;

[0046] (3) The matte skin-feel material provided by the present invention can be directly used for product molding (injection molding, blow molding). The molding process can form a matte appearance, soft skin feel and unique friction touch on the product surface without the need for additional mold design. Compared with the existing matte skin-feel coating process, the production process and flow are greatly reduced, which helps to reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 Schematic diagram of a sample made using Example 1 as an outer layer material (right) and a sample made without using Example 1 as an outer layer material (left).

[0048] Figure 2 Schematic diagram of samples of different bottle types made using Example 1 as the outer layer material.

[0049] Figure 1 It can be seen that the left sample and the background have obvious gloss under the same light environment, indicating that its appearance has a higher glossiness, while the right sample is matte, indicating that the use of Example 1 gives it a low-gloss appearance.

[0050] Figure 2 It shows that the present invention can achieve low gloss appearance when used in different bottle types. DETAILED DESCRIPTION

[0051] The present invention is further described in detail below in conjunction with examples and drawings, but the embodiments of the present invention are not limited thereto.

[0052] If no specific conditions are specified in the examples of the present invention, the experiments were carried out under conventional conditions or conditions recommended by the manufacturer. All raw materials, reagents, etc., whose manufacturers are not specified, are conventional products that can be purchased commercially.

[0053] Examples 1-8

[0054] Examples 1-8 provide different formulations of matte skin-feel materials, each of which includes the following components by weight, as shown in the following table:

[0055] Table 1

[0056]

[0057]

[0058] The raw materials used in the experiments described in the table are: HDPE is HDPE B5502A produced by CNOOC and Shell, PPH is PPCJS700 produced by Guangzhou Petrochemical, PPR is PP HT9025NX produced by Maoming Petrochemical, PPB is PP BJ5500 produced by Hanwha Total Petrochemical, SEBS is SEBS YH-610 produced by Baling Petrochemical, POE is POE HM7387 produced by Dow, and EPDM is EPDM 785 produced by Dow.

[0059] The preparation method of the matte skin-feel material comprises the following steps:

[0060] The weighed raw materials are mixed evenly in a high-speed mixer, and then the mixture is melt-extruded through a twin-screw extruder, cooled, dried, and pelletized to obtain the pellets of the present invention, wherein the screw diameter of the co-rotating twin-screw extruder is 30 mm, the aspect ratio is 48, the screw barrel temperature control settings are as follows: zone 1 180° C., zones 2-4 200° C., zone 5 190° C., the die head temperature is 190° C., the main engine speed is controlled at 250 rpm, and the screw speed is 300 rpm.

[0061] Comparative Example 1

[0062] This comparative example provides a blended modified material, which is different from Example 1 only in that no elastomer is added to the blended modified material, the polypropylene content is increased to 95 parts, and the contents of other components and the preparation method are exactly the same as those in Example 1.

[0063] Comparative Example 2

[0064] This comparative example provides a blended modified material, which is different from Example 1 only in that polypropylene is not added to the blended modified material, the elastomer content is increased to 95 parts, and the contents of other components and the preparation method are exactly the same as those in Example 1.

[0065] Comparative Example 3

[0066] This comparative example provides a blended modified material, which is different from Example 1 only in that the elastomer is replaced by ABS of equal mass, and the contents of other components and the preparation method are exactly the same as those of Example 1. The ABS is ABS AE490 produced by Asahi Kasei.

[0067] Comparative Example 4

[0068] This comparative example provides a blended modified material, which is different from Example 1 only in that the elastomer content is reduced to 20 parts and the polypropylene content is increased to 75 parts. The contents of other components and the preparation method are exactly the same as those in Example 1.

[0069] Comparative Example 5

[0070] This comparative example provides a blended modified material, which is different from Example 1 only in that the content of the elastomer is increased to 80 parts and the content of the polypropylene is reduced to 15 parts. The contents of other components and the preparation method are exactly the same as those in Example 1.

[0071] Comparative Example 6

[0072] This comparative example provides a blended modified material, which is different from Example 1 only in that polypropylene and elastomer are not added to the blended material, polyethylene is increased to 100 parts, and the contents of other components and the preparation method are exactly the same as those of Example 1.

[0073] Comparative Example 7

[0074] This comparative example provides a blended modified material, which is different from Example 1 only in that polypropylene and polyethylene are not added to the blended material, the elastomer is increased to 100 parts, and the contents of other components and the preparation method are exactly the same as those of Example 1.

[0075] The materials of the above embodiments and comparative examples are tested as follows:

[0076] 1) Friction coefficient test:

[0077] Test samples: the matte skin-feel materials provided in Examples 1-8, and the blended modified materials provided in Comparative Examples 1-7; they are respectively used as the outer layer materials of a double-layer co-extrusion blow bottle, and the inner layer uses HDPE to make a double-layer bottle with the corresponding outer layer materials, and the made bottle body is cut into test samples of suitable size and consistent weight;

[0078] Test method: Use a friction coefficient tester to test, refer to GB / T 10006 "Determination of friction coefficient of plastic films and sheets" for the method of measuring the static friction coefficient and dynamic friction coefficient of the test sample against ordinary A4 paper.

[0079] 2) Skin feel and friction touch test:

[0080] Test samples: the matte skin-feel materials provided in Examples 1-8, and the blended modified materials provided in Comparative Examples 1-7; they are respectively used as the outer layer materials of a double-layer co-extrusion blow bottle, and HDPE is used for the inner layer, and double-layer bottles with corresponding outer layer materials are made as test samples;

[0081] Test method: Each sample to be tested is evaluated for skin feel from the dimensions of surface elasticity, friction feel, and comfort of holding by no less than 5 trained personnel; specifically, the evaluation is performed by sliding the fingers on the surface of the sample with moderate force after holding the bottle. Level 1 represents skin-like softness and friction touch, level 5 represents hard and smooth touch, and levels 2-4 represent different levels of change from soft to hard and friction touch, and levels 1-5 correspond to the best skin feel, better, moderate, poor, and very poor. The average value is taken from the evaluation results of 5 people, and the average value is rounded off as the evaluation result. The skin feel of the present invention must be at least moderate, that is, level 2 and below.

[0082] The test results are shown in Table 2.

[0083] Table 2

[0084] Gloss 60° Static friction coefficient Dynamic friction coefficient Skin feel test evaluation Example 1 2.5 0.642 0.562 1 Example 2 2.3 0.662 0.587 1 Example 3 2.4 0.621 0.562 1 Example 4 2.7 0.613 0.552 1 Example 5 2.8 0.601 0.544 2 Example 6 2.2 0.670 0.608 1 Example 7 2.5 0.541 0.489 1 Example 8 2.4 0.624 0.566 1 Comparative Example 1 10.7 0.267 0.195 5 Comparative Example 2 7.1 0.349 0.249 4 Comparative Example 3 12.1 0.221 0.122 5 Comparative Example 4 11.7 0.217 0.115 4 Comparative Example 5 6.8 0.303 0.225 4 Comparative Example 6 10.2 0.252 0.154 5 Comparative Example 7 6.1 0.332 0.245 4

[0085] As can be seen from Table 2, the glossiness of each embodiment is lower than that of the comparative example, indicating that the present invention has low glossiness and is a matte surface; the friction coefficient of each embodiment is higher than that of the comparative example. The lower friction coefficient in the comparative example indicates that the sample surface is smoother, which is no different from ordinary PE / PP bottles, while the friction coefficient of each embodiment is higher, and there will be a unique friction touch when holding it. The present invention has a good friction touch; and the skin feel and friction touch test show that the skin feel test of each embodiment reaches moderate or above, indicating that the skin feel effect of the present invention is good. In summary, it can be seen that each embodiment has a soft skin feel and a unique friction touch effect, which reflects the beneficial effects of the present invention.

[0086] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A matte skin-feel material, characterized in that: By weight, it includes the following components: 0-20 parts of polyethylene, 20-60 parts of polypropylene, 40-70 parts of elastomer, and 0-5 parts of additives.

2. The matte skin-feel material according to claim 1, characterized in that: By weight, it includes the following components: 0-10 parts of polyethylene, 30-60 parts of polypropylene, 40-70 parts of elastomer, 0.1-5 parts of additives; Alternatively, 0-5 parts of polyethylene, 40-60 parts of polypropylene, 40-60 parts of elastomer, and 0.5-2.5 parts of additives.

3. The matte skin-feel material according to any one of claims 1 to 2, characterized in that: The molecular weight of the polypropylene is 100000-500000; The elastomer is at least one of a thermoplastic styrene elastomer, a thermoplastic polyolefin elastomer, a thermoplastic polyurethane elastomer and a synthetic rubber; Alternatively, the elastomer is at least one of a thermoplastic styrene elastomer, a thermoplastic polyolefin elastomer and a synthetic rubber.

4. The matte skin-feel material according to claim 3, characterized in that: The thermoplastic styrene elastomer is a styrene-butadiene-styrene block copolymer and / or a styrene-ethylene / butylene-styrene block copolymer, and the molecular weight is 100,000-700,000, wherein the mass percentage of butadiene in the styrene-butadiene-styrene block copolymer is 60-80%, and the styrene-ethylene / butylene-styrene block copolymer is obtained by hydrogenating styrene-butadiene-styrene, and the hydrogenation rate is 90-99%; The thermoplastic polyolefin elastomer is a polyolefin elastomer with a molecular weight of 300,000-700,000, wherein the mass percentage of α-olefin is 20-40%; The synthetic rubber is EPDM rubber with a molecular weight of 150,000-700,000, wherein the mass percentages of ethylene, propylene and non-conjugated dienes in the EPDM rubber are 60-80%, 15-35% and 3-8% respectively; The polypropylene is block copolymer polypropylene.

5. The matte skin-feel material according to claim 3, characterized in that: The polyethylene is at least one of linear low-density polyethylene, low-density polyethylene and high-density polyethylene; The molecular weight of the polyethylene is 40,000-300,000.

6. The matte skin-feel material according to claim 3, characterized in that: The auxiliary agent is at least one of a dispersant and an antioxidant; The dispersant is at least one of amorphous solid paraffin, microcrystalline paraffin, liquid paraffin, polyethylene wax, oxidized polyethylene wax, ethylene-vinyl acetate copolymer wax, montan wax, polyester wax, ethylene bis stearamide, stearic acid, stearate and white oil; The antioxidant is at least one of hindered phenol antioxidants, phosphite antioxidants, amine antioxidants, sulfur-containing antioxidants and metal salt antioxidants.

7. The matte skin-feel material according to claim 6, characterized in that: In parts by weight, the auxiliary agent is a composition of 0-2 parts of a dispersant and 0.5-1 parts of an antioxidant; The dispersant is polyethylene wax and / or white oil; The antioxidant is antioxidant 1010 and / or antioxidant 168.

8. The method for preparing the matte skin-feel material according to any one of claims 1 to 7, characterized in that: The following steps are involved: The polyethylene, polypropylene, elastomer and additives are mixed evenly, melt-extruded, dried, cooled and pelletized into a shape.

9. Use of the matte skin-feel material according to any one of claims 1 to 7 in double-layer extrusion blow bottle molding.

10. The use according to claim 9, characterized in that: The application of the matte skin-feel material as the outer layer material of a double-layer extrusion blow bottle comprises the following steps: The matte skin-feel material is added as the outer layer material into the outer layer screw hopper, and the extrusion blow-grade PP and / or HDPE material is added as the inner layer material into the inner layer screw hopper; the material blank is extruded, the thickness of the material blank is adjusted to be uniform, and the weight is set according to the product standard, and finally a matte skin-feel double-layer extrusion blow-blow bottle is formed.

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