阅读说明：本技术 一种高强度耐磨pe透气膜复合材料及其制备方法 (High-strength wear-resistant PE (polyethylene) breathable film composite material and preparation method thereof ) 是由 王雷 吴摞 余莉花 李荣群 王灿耀 于 2021-09-24 设计创作，主要内容包括：本发明公开了一种高强度耐磨PE透气膜复合材料及其制备方法,其由以下组分按照重量份制备而成：基体树脂40-53份、无机填充剂20-40份、耐磨剂10-20份、分散剂3.3-5.5份、聚四氟乙烯3-5份、二氧化硅0.5-1份、抗氧剂0.2-0.4份。本发明中利用铝酸酯偶联剂对钛酸钾进行表面活性处理后,极大提高了其分散性能和基体树脂的结合强度,结合加入的超细二氧化硅和低分子量的聚四氟乙烯,一方面提高了复合材料的强度,另一方面提高了复合材料的耐磨性能和使用寿命。通过提高PE透气膜复合材料的拉伸强度和耐磨性,从而改善PE透气膜防护服的使用强度和抗磨损能力。(The invention discloses a high-strength wear-resistant PE (polyethylene) breathable film composite material and a preparation method thereof, wherein the composite material is prepared from the following components in parts by weight: 40-53 parts of matrix resin, 20-40 parts of inorganic filler, 10-20 parts of wear-resisting agent, 3.3-5.5 parts of dispersing agent, 3-5 parts of polytetrafluoroethylene, 0.5-1 part of silicon dioxide and 0.2-0.4 part of antioxidant. After the surface active treatment is carried out on the potassium titanate by utilizing the aluminate coupling agent, the dispersing performance and the bonding strength of matrix resin are greatly improved, and the added superfine silicon dioxide and the low molecular weight polytetrafluoroethylene are combined, so that the strength of the composite material is improved, the wear resistance of the composite material is improved, and the service life of the composite material is prolonged. The tensile strength and the wear resistance of the PE breathable film composite material are improved, so that the use strength and the wear resistance of the PE breathable film protective clothing are improved.)

1. The high-strength wear-resistant PE breathable film composite material is characterized by being prepared from the following components in parts by weight:

2. the high-strength abrasion-resistant PE breathable film composite material as claimed in claim 1, wherein the matrix resin is prepared from LLDPE and LDPE according to the weight ratio of (35-45): (5-8) according to the weight ratio.

3. The high-strength abrasion-resistant PE breathable film composite material according to claim 1, wherein the inorganic filler is activated calcium carbonate, and the D50 of the activated calcium carbonate is 1.5-2 μm.

4. The high-strength wear-resistant PE breathable film composite material according to claim 1, wherein the wear-resistant agent is potassium titanate subjected to surface active treatment by a coupling agent, and the aspect ratio of the potassium titanate is less than 2.0.

5. The high strength abrasion resistant PE breathable film composite according to claim 1, wherein the dispersant is prepared from silicone powder and erucamide according to the following formula (10-6): 1 by weight ratio.

6. The high-strength abrasion-resistant PE breathable film composite material according to claim 1, wherein the antioxidant is a hindered phenol antioxidant.

7. The PE breathable film composite material with high strength and wear resistance as claimed in claim 1, wherein the polytetrafluoroethylene is in a powder form and has an average molecular weight of 5000-10000.

8. The high-strength abrasion-resistant PE breathable film composite material according to claim 1, wherein the polytetrafluoroethylene surface is subjected to an activation treatment.

9. The high-strength abrasion-resistant PE breathable film composite material according to claim 1, wherein the silica is nano-scale silica.

10. A process for preparing a high strength abrasion resistant PE breathable film composite according to any of claims 1 to 9, comprising the steps of:

weighing LLDPE, LDPE, polytetrafluoroethylene, silicone powder, silicon dioxide, antioxidant, erucamide and potassium titanate according to the weight parts, fully mixing, adding through a main feeding port of a double-screw extruder, adding activated calcium carbonate through a side feeding port in two sections, and carrying out melting, mixing, dispersing, extruding and granulating to obtain the wear-resistant PE breathable film composite material;

wherein the length-diameter ratio of the double-screw extruder is not less than 48: 1, the working temperature is 160-.

Technical Field

The invention relates to the field of polymer modified materials, in particular to a high-strength wear-resistant PE breathable film composite material and a preparation method thereof.

Background

The PE breathable film mainly takes linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE) and other matrix resins as main materials, is filled and modified by ultrafine calcium carbonate, and is widely applied to the fields of medical protective clothing, infant paper diapers, adult paper diapers, sanitary napkins, warming babies and packaging. After the matrix resin is filled and modified by calcium carbonate, the matrix resin is subjected to tape casting or blow molding and then is stretched, and the edges of the matrix resin and the inorganic filled calcium carbonate are separated to generate fine micropores (generally a few micrometers to 20 micrometers), so that the breathable waterproof fabric has breathable and waterproof performances. The PE breathable film has special air permeability, water resistance, blood and virus blocking performance and the like, and has outstanding comfort and safety compared with the traditional film material.

Along with the continuous improvement of the substance level of people, the demand on the breathable film is gradually increased, and the requirement on the breathable film is higher and higher. For example, breathable films used in medical protective clothing are required to have an increased abrasion resistance in addition to a long life and safety. Protective clothing for the construction sector is then stressed with regard to mechanical strength, tear resistance and abrasion resistance.

Disclosure of Invention

In view of the above, the present invention needs to provide a high-strength wear-resistant PE breathable film composite material and a preparation method thereof, which can improve the use strength and wear resistance of PE breathable film protective clothing by improving the tensile strength and wear resistance of the PE breathable film composite material.

In order to achieve the purpose, the invention provides the following technical scheme:

the invention discloses a high-strength wear-resistant PE (polyethylene) breathable film composite material which is prepared from the following components in parts by weight: 40-53 parts of matrix resin, 20-40 parts of inorganic filler, 10-20 parts of wear-resisting agent, 3.3-5.5 parts of dispersing agent, 3-5 parts of polytetrafluoroethylene, 0.5-1 part of silicon dioxide and 0.2-0.4 part of antioxidant.

As a further scheme of the invention: the matrix resin is prepared from LLDPE and LDPE according to the weight ratio of (35-45): (5-8) according to the weight ratio.

As a further scheme of the invention: the inorganic filler is activated calcium carbonate, and the D50 of the inorganic filler is 1.5-2 mu m.

As a further scheme of the invention: the wear-resisting agent is potassium titanate subjected to surface active treatment by a coupling agent, and the length-diameter ratio of the potassium titanate is less than 2.0.

As a further scheme of the invention: the dispersing agent is prepared from silicone powder and erucamide according to the ratio of (10-6): 1 by weight ratio.

As a further scheme of the invention: the antioxidant is hindered phenol antioxidant.

As a further scheme of the invention: the polytetrafluoroethylene is powder, and has the average molecular weight of 5000-10000.

As a further scheme of the invention: the surface of the polytetrafluoroethylene is subjected to activation treatment.

As a further scheme of the invention: the silicon dioxide is nano-scale silicon dioxide.

The invention also discloses a preparation method of the high-strength wear-resistant PE breathable film composite material, which comprises the following steps:

weighing LLDPE, LDPE, polytetrafluoroethylene, silicone powder, silicon dioxide, antioxidant, erucamide and potassium titanate according to the weight parts, fully mixing, adding through a main feeding port of a double-screw extruder, adding activated calcium carbonate through a side feeding port in two sections, and carrying out melting, mixing, dispersing, extruding and granulating to obtain the wear-resistant PE breathable film composite material;

wherein the length-diameter ratio of the double-screw extruder is not less than 48: 1, the working temperature is 160-.

Compared with the prior art, the invention has the beneficial effects that:

after the surface active treatment is carried out on the potassium titanate by utilizing the aluminate coupling agent, the dispersing performance and the bonding strength of matrix resin are greatly improved, and the added superfine silicon dioxide and the low molecular weight polytetrafluoroethylene are combined, so that the strength of the composite material is improved, the wear resistance of the composite material is improved, and the service life of the composite material is prolonged. In addition, a proper amount of silicone powder and erucamide are introduced into the system, and the silicone powder and the erucamide have synergistic effect, so that the dispersing capacity of the inorganic filler and the smoothness of the composite material are improved, the surface friction coefficient of the breathable film is reduced, and the wear resistance of the material is improved to a great extent.

According to the invention, by introducing a proper amount of nano-scale silicon dioxide, the material is rapidly oriented and crystallized after being stretched and cooled in the process of casting film forming, the tensile strength and the processing efficiency of the PE breathable film are effectively improved, the post-shrinkage phenomenon in the material forming process is improved, and the mechanical strength of the PE breathable film is also improved by matching the nano-scale silicon dioxide with erucamide.

The screw extrusion process adopts a specific screw combination and process, and can reduce the decomposition of materials, so that the calcium carbonate can be better dispersed in a system, and the stability of subsequent casting film forming is obviously improved.

Detailed Description

In order that the invention may be more fully understood, reference will now be made to the specific embodiments illustrated. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The following examples and comparative examples employ the following raw material specific information:

LLDPE, density > 0.920, melt index > 3.5, grade LLDPE-3527, manufacturer Exxon Mobil;

LDPE, melt index > 7(190 ℃, 2.16 kg), a designation of 90D-DC, manufactured by Flontech, Italy;

activated calcium carbonate, brand No.: h2-55, manufacturer is: omega, omega;

adding potassium titanate inorganic powder into 0.5 percent of aluminate coupling agent, and mixing for more than 10 minutes in a high-speed mixer to obtain the wear-resistant agent; the rotating speed of the high-speed mixer is 1000-1200 r/min, and the working temperature is 100 ℃;

the polytetrafluoroethylene powder has the trade mark: the TP300 manufacturer is: suzhou Nuo liter functional high molecular materials, Inc.;

silicone powder, brand TY-360, was produced by Guangzhou New materials (Guangzhou);

silica, brand No.: BT386 is Shouguang Baote chemical Co., Ltd;

antioxidant, 1010, from BASF, germany;

erucamide, tradename Polyscip-E, manufactured by tosville, korea;

all materials are conventional and common products sold in the market.

It is understood that the above raw material reagents are only examples of some specific embodiments of the present invention, so as to make the technical scheme of the present invention more clear, and do not represent that the present invention can only adopt the above reagents, particularly, the scope of the claims is subject to. In addition, "parts" described in examples and comparative examples mean parts by weight unless otherwise specified.

Any range recited herein is intended to include the endpoints and any number between the endpoints and any subrange subsumed therein or defined therein.

Example 1

Weighing 35 parts of dried LLDPE, 8 parts of LDPE, 10 parts of wear-resisting agent, 3 parts of polytetrafluoroethylene powder, 3 parts of silicone powder, 0.5 part of silicon dioxide, 0.2 part of antioxidant and 0.3 part of erucamide, adding into a high-speed mixer, mixing for 5-8min, and adding from a main feeding port of a double-screw extruder; and simultaneously weighing 40 parts of activated calcium carbonate, adding the activated calcium carbonate from a side feeding port in two sections (four sections and seven sections), and carrying out melting, mixing, dispersing, extruding and granulating to obtain the wear-resistant PE breathable film composite material.

Wherein the processing temperature of the double-screw extruder is 160 ℃ in the first zone, 180 ℃ in the second zone, 190 ℃ in the third zone, 190 ℃ in the fourth zone, 190 ℃ in the fifth zone, 190 ℃ in the sixth zone, 190 ℃ in the seventh zone, 180 ℃ in the eighth zone, 180 ℃ in the ninth zone, 180 ℃ in the tenth zone, 180 ℃ in the eleventh zone, the head temperature is 200 ℃, and the rotating speed of the screw is controlled at 500 r/min.

Example 2

Weighing 45 parts of dried LLDPE, 5 parts of LDPE, 20 parts of wear-resisting agent, 5 parts of polytetrafluoroethylene powder, 5 parts of silicone powder, 1 part of silicon dioxide, 0.4 part of antioxidant and 0.5 part of erucamide, adding into a high-speed mixer, mixing for 5-8min, and adding from a main feeding port of a double-screw extruder; and simultaneously weighing 20 parts of activated calcium carbonate, adding the activated calcium carbonate from a side feeding port in two sections (four sections and seven sections), and carrying out melting, mixing, dispersing, extruding and granulating to obtain the wear-resistant PE breathable film composite material.

Wherein the processing temperature of the double-screw extruder is 160 ℃ in the first zone, 180 ℃ in the second zone, 190 ℃ in the third zone, 190 ℃ in the fourth zone, 190 ℃ in the fifth zone, 190 ℃ in the sixth zone, 190 ℃ in the seventh zone, 180 ℃ in the eighth zone, 180 ℃ in the ninth zone, 180 ℃ in the tenth zone, 180 ℃ in the eleventh zone, the head temperature is 200 ℃, and the rotating speed of the screw is controlled at 500 r/min.

Example 3

Weighing 40 parts of dried LLDPE, 6 parts of LDPE, 15 parts of wear-resisting agent, 4 parts of polytetrafluoroethylene powder, 4 parts of silicone powder, 0.8 part of silicon dioxide, 0.3 part of antioxidant and 0.4 part of erucamide, adding into a high-speed mixer, mixing for 5-8min, and adding from a main feeding port of a double-screw extruder; and simultaneously weighing 30 parts of activated calcium carbonate, adding the activated calcium carbonate from a side feeding port in two sections (four areas and seven areas), and carrying out melting, mixing, dispersing, extruding and granulating to obtain the wear-resistant PE breathable film composite material.

Wherein the processing temperature of the double-screw extruder is 160 ℃ in the first zone, 180 ℃ in the second zone, 190 ℃ in the third zone, 190 ℃ in the fourth zone, 190 ℃ in the fifth zone, 190 ℃ in the sixth zone, 190 ℃ in the seventh zone, 180 ℃ in the eighth zone, 180 ℃ in the ninth zone, 180 ℃ in the tenth zone, 180 ℃ in the eleventh zone, the head temperature is 200 ℃, and the rotating speed of the screw is controlled at 500 r/min.

Example 4

Weighing 35 parts of dried LLDPE, 5 parts of LDPE, 20 parts of wear-resisting agent, 3 parts of polytetrafluoroethylene powder, 3 parts of silicone powder, 1 part of silicon dioxide, 0.4 part of antioxidant and 0.5 part of erucamide, adding into a high-speed mixer, mixing for 5-8min, and adding from a main feeding port of a double-screw extruder; and simultaneously weighing 27 parts of activated calcium carbonate, adding the activated calcium carbonate from a side feeding port in two sections (four sections and seven sections), and carrying out melting, mixing, dispersing, extruding and granulating to obtain the wear-resistant PE breathable film composite material.

Wherein the processing temperature of the double-screw extruder is 160 ℃ in the first zone, 180 ℃ in the second zone, 190 ℃ in the third zone, 190 ℃ in the fourth zone, 190 ℃ in the fifth zone, 190 ℃ in the sixth zone, 190 ℃ in the seventh zone, 180 ℃ in the eighth zone, 180 ℃ in the ninth zone, 180 ℃ in the tenth zone, 180 ℃ in the eleventh zone, the head temperature is 200 ℃, and the rotating speed of the screw is controlled at 500 r/min.

Comparative example 1

The procedure was as in example 1 except that the anti-wear agent was not added.

Comparative example 2

The procedure was as in example 1 except that polytetrafluoroethylene was not added.

Comparative example 3

The procedure was as in example 1 except that no silica was added.

Comparative example 4

The procedure was as in example 1 except that silicone powder and erucamide were not added.

Comparative example 5

The procedure was as in example 1 except that no silicone powder was added.

Comparative example 6

The procedure was as in example 1 except that erucamide was not added.

After tape casting, the PE breathable film composites prepared in examples 1 to 4 and comparative examples 1 to 4 were drawn up at 2.0 to 2.4 times to prepare PE breathable films, and were subjected to abrasion resistance test, air permeability test, and film strength test under the following test standards and test conditions:

(1) and (3) testing the wear resistance:

according to the test standard, the PE breathable film and the non-woven fabric are compounded and then tested according to GB/T21196.2-2007, wherein the weight of the breathable film is 25 g, and the weight of the composite film is 70 g.

(2) And (3) testing the air permeability of the material:

according to the evaluation by testing the moisture permeability, the PE breathable film composite material is subjected to film blowing to prepare a breathable film of 30 g/square meter, and the test standard is GB/T12704.1-2009; the higher the moisture permeability, the better the air permeability of the material.

(3) Testing the strength of the film:

the test standard refers to the GB/T1040-.

The test results are shown in Table 1.

TABLE 1 test results of examples and comparative examples

Item	Abrasion resistance/number of times	Moisture permeability/g/(m)2*d)	Film Strength/N
				Example 1	2200	2700	12.4
Example 2	2400	1800	13.8
				Example 3	2280	2200	12.8
Example 4	2510	2430	14.3
				Comparative example 1	1500	2550	10.8
Comparative example 2	2000	2800	11.5
				Comparative example 3	2160	2680	11.1
Comparative example 4	2000	2650	12.3
				Comparative example 5	2170	2600	12
Comparative example 6	2050	2780	12.8

As can be seen from the experimental data in Table 1, the wear-resistant effect of the PE breathable film composite material is greatly improved after the PE breathable film composite material is added with potassium titanate and polytetrafluoroethylene, wherein the potassium titanate effect is obvious. The moisture permeability of the material is greatly influenced by the addition amount of the activated calcium carbonate. The tensile strength of the potassium titanate and polytetrafluoroethylene added film is obviously improved, and the tensile force of the structural film without the potassium titanate is improved from 10.8N to 13.8N. The strength of the film can be improved by adding the nano silicon dioxide; the silicone powder and erucamide can improve the abrasion resistance of the film.

Although the present description is described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to integrate the description as a whole, and the embodiments can be appropriately combined to form other embodiments as will be understood by those skilled in the art.

Therefore, the above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application; all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.