阅读说明：本技术 一种聚丙烯防水透气膜 (Waterproof ventilated membrane of polypropylene ) 是由 刘建平 刘子赫 陈荣丰 宋霞 于 2019-10-18 设计创作，主要内容包括：本发明公开了一种聚丙烯防水透气膜,通过以聚丙烯、碳酸钙和膨润土作为主要原料,同时加入松香甘油酯以及各种助剂反应制得；在反应物中加入了改性剂,改性剂用于对聚丙烯进行改性处理,改性性是以4-氟邻苯二甲酸酐、二乙二醇乙醚和(1S,2S)-(+)-2-氨基-1-(4-硝基苯基)-1,3-丙二醇作为反应物,在温度为80-100℃的条件下,发生聚合反应而成；还加入了调节剂,调节剂为4,4’-二氨基-2,2’-二硝基二苯基甲烷、二甲基顺丁烯二酸酐和1,2-环氧-4-乙烯基环己烷的混合物,调节剂能够使得改性剂在聚丙烯中分散更加均匀,大大提高了改性剂的改性作用。最终制得的聚丙烯防水透气膜不仅具有较强的防水透气性,其透湿量较大,同时还具有较大的拉伸强度和断裂伸长率。(The invention discloses a polypropylene waterproof breathable film, which is prepared by taking polypropylene, calcium carbonate and bentonite as main raw materials and adding rosin glyceride and various auxiliaries for reaction; adding a modifier into the reactant, wherein the modifier is used for modifying polypropylene, and the modifier is prepared by taking 4-fluorophthalic anhydride, diethylene glycol ethyl ether and (1S, 2S) - (+) -2-amino-1- (4-nitrophenyl) -1, 3-propylene glycol as reactants and carrying out polymerization reaction at the temperature of 80-100 ℃; and a regulator is also added, the regulator is a mixture of 4, 4 '-diamino-2, 2' -dinitrodiphenylmethane, dimethylmaleic anhydride and 1, 2-epoxy-4-vinyl cyclohexane, and the regulator can ensure that the modifier is dispersed in the polypropylene more uniformly, so that the modification effect of the modifier is greatly improved. The finally prepared polypropylene waterproof breathable film has strong waterproof and breathable performance, large moisture permeability, and high tensile strength and elongation at break.)

1. A polypropylene waterproof breathable film is characterized in that: the composition comprises the following substances in parts by weight:

70-80 parts of polypropylene;

10-15 parts of calcium carbonate

10-15 parts of bentonite

1-2 parts of rosin glyceride;

2-3 parts of a coupling agent;

1-2 parts of a regulator;

1-2 parts of a modifier;

1-2 parts of a plasticizer;

1-2 parts of an antioxidant.

2. The waterproof and breathable polypropylene film according to claim 1, wherein: the modifier comprises the following substances in parts by weight:

4 parts of 4-fluorophthalic anhydride;

diethylene glycol Ether 5 parts

1 part of (1S, 2S) - (+) -2-amino-1- (4-nitrophenyl) -1, 3-propanediol.

3. The waterproof and breathable polypropylene film according to claim 2, wherein: the preparation method of the modifier comprises the following steps:

the method comprises the following steps: preparing raw materials according to the set weight part, adding 4-fluorophthalic anhydride into a reaction vessel filled with acetone, stirring and mixing, and forming a mixed solution after uniformly mixing;

step two: adding diethylene glycol ethyl ether and (1S, 2S) - (+) -2-amino-1- (4-nitrophenyl) -1, 3-propanediol into the mixed solution in sequence, and stirring and mixing; after being uniformly mixed, the temperature of the mixed solution is raised to 80-100 ℃ for reaction, and the reaction time is 4-6 h; after the reaction is finished, removing acetone by rotary evaporation to obtain the modifier.

4. The waterproof and breathable polypropylene film according to claim 3, wherein: the regulator is a mixture of 4, 4 '-diamino-2, 2' -dinitrodiphenylmethane, dimethylmaleic anhydride and 1, 2-epoxy-4-vinyl cyclohexane, and the mass ratio of the regulator to the dimethylmaleic anhydride to the 1, 2-epoxy-4-vinyl cyclohexane is 1: 1.

5. The waterproof and breathable polypropylene film according to claim 4, wherein: the coupling agent is a mixture of (1-fluoroethylene) methyldiphenylsilane and vinyl-tri (2-methoxyethoxy) silane, and the mass ratio of the coupling agent to the vinyl-tri (2-methoxyethoxy) silane is 1: 2.

6. The waterproof and breathable polypropylene film according to claim 5, wherein: the plasticizer is dioctyl phthalate.

7. The waterproof and breathable polypropylene film according to claim 6, wherein: the antioxidant is ethylene bistetrabromophthalimide.

8. The waterproof and breathable polypropylene film according to claim 7, wherein: the preparation method of the polypropylene waterproof breathable film comprises the following steps:

s1: preparing raw materials according to the set weight part, mixing and extruding the component materials to prepare granules, adding the granules into a double-screw extruder, heating the granules to a molten state at the temperature of 250-270 ℃, filtering the obtained melt, extruding the filtered melt into a membrane through a single-layer die head, and rapidly cooling the membrane to form a cast sheet;

s2, preheating the casting sheet prepared in the step S1 at the temperature of 140 ℃ and 150 ℃, and longitudinally stretching the casting sheet for 4-5 times at the temperature of 130 ℃ and 140 ℃ to obtain a thick film;

s3: preheating the thick film prepared in the step S2 at the temperature of 150-;

s4, flattening the film cooled and shaped in the step S3, and rolling to obtain the polypropylene waterproof breathable film.

9. The waterproof and breathable polypropylene film according to claim 8, wherein: and filtering the melt obtained in the step S1 by using a filter screen of 300-500 meshes, extruding the melt into a membrane through a single-layer die head, and attaching the membrane to a chill roll by using a high-pressure air knife to quench and form a cast sheet.

Technical Field

The invention relates to a film, in particular to a polypropylene waterproof breathable film.

Background

The waterproof breathable film is a novel high-molecular waterproof material, and can effectively prevent water from passing through and allow gas to pass through. The waterproof breathable film has a very wide application range, is mainly applied to the fields of buildings, electronics, chemical medical equipment, food packaging and the like, and has wide market space and vigorous demand. However, the mechanical properties of the waterproof breathable film in the market at present are very general, particularly the tensile strength and the elongation at break are poor, and the requirements of normal production and life cannot be met, so that the development of the waterproof breathable film is greatly limited.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a polypropylene waterproof breathable film which has higher tensile strength and elongation at break.

In order to achieve the purpose, the invention provides the following technical scheme: a polypropylene waterproof breathable film comprises the following substances in parts by weight:

70-80 parts of polypropylene;

10-15 parts of calcium carbonate

10-15 parts of bentonite

1-2 parts of rosin glyceride;

2-3 parts of a coupling agent;

1-2 parts of a regulator;

1-2 parts of a modifier;

1-2 parts of a plasticizer;

1-2 parts of an antioxidant.

As a further improvement of the invention, the modifier comprises the following substances in parts by weight:

4 parts of 4-fluorophthalic anhydride;

diethylene glycol Ether 5 parts

1 part of (1S, 2S) - (+) -2-amino-1- (4-nitrophenyl) -1, 3-propanediol.

As a further improvement of the invention, the preparation method of the modifier comprises the following steps:

the method comprises the following steps: preparing raw materials according to the set weight part, adding 4-fluorophthalic anhydride into a reaction vessel filled with acetone, stirring and mixing, and forming a mixed solution after uniformly mixing;

step two: adding diethylene glycol ethyl ether and (1S, 2S) - (+) -2-amino-1- (4-nitrophenyl) -1, 3-propanediol into the mixed solution in sequence, and stirring and mixing; after being uniformly mixed, the temperature of the mixed solution is raised to 80-100 ℃ for reaction, and the reaction time is 4-6 h; after the reaction is finished, removing acetone by rotary evaporation to obtain the modifier.

As a further improvement of the invention, the regulator is a mixture of 4, 4 '-diamino-2, 2' -dinitrodiphenylmethane, dimethylmaleic anhydride and 1, 2-epoxy-4-vinyl cyclohexane, and the mass ratio of the regulator to the 1: 1.

As a further improvement of the invention, the coupling agent is a mixture of (1-fluoroethylene) methyldiphenylsilane and vinyl-tris (2-methoxyethoxy) silane in a mass ratio of 1: 2.

As a further improvement of the invention, the plasticizer is dioctyl phthalate.

As a further improvement of the invention, the antioxidant is ethylene bistetrabromophthalimide.

As a further improvement of the invention, the preparation method of the polypropylene waterproof breathable film comprises the following steps:

s1: preparing raw materials according to the set weight part, mixing and extruding the component materials to prepare granules, adding the granules into a double-screw extruder, heating the granules to a molten state at the temperature of 250-270 ℃, filtering the obtained melt, extruding the filtered melt into a membrane through a single-layer die head, and rapidly cooling the membrane to form a cast sheet;

s2, preheating the casting sheet prepared in the step S1 at the temperature of 140 ℃ and 150 ℃, and longitudinally stretching the casting sheet for 4-5 times at the temperature of 130 ℃ and 140 ℃ to obtain a thick film;

s3: preheating the thick film prepared in the step S2 at the temperature of 150-;

s4, flattening the film cooled and shaped in the step S3, and rolling to obtain the polypropylene waterproof breathable film.

As a further improvement of the invention, the melt obtained in S1 is filtered by a 300-500-mesh filter screen, extruded into a film through a single-layer die head, and attached to a chill roll by a high-pressure air knife to be quenched to form a cast sheet.

The invention has the beneficial effects that: the polypropylene calcium carbonate bentonite is prepared by taking polypropylene, calcium carbonate and bentonite as main raw materials, and adding rosin glyceride and various auxiliaries for reaction; polypropylene is a polymer obtained by addition polymerization of propylene, does not contain any hydrophilic (polar) group, and therefore has relatively good hydrophobicity; the mechanical property of the waterproof breathable film can be enhanced by taking calcium carbonate and bentonite as fillers; on one hand, the rosin glyceride improves the lubricity among all reaction components, and on the other hand, the weather resistance of the waterproof breathable film is improved; as one of creativity of the invention, a modifier is added into a reactant, the modifier is used for modifying polypropylene, and the modifier is prepared by taking 4-fluorophthalic anhydride, diethylene glycol ethyl ether and (1S, 2S) - (+) -2-amino-1- (4-nitrophenyl) -1, 3-propylene glycol as reactants and carrying out polymerization reaction at the temperature of 80-100 ℃; the modifier contains functional groups of fluorine, nitro and phenyl, so that on one hand, the mechanical properties, especially the tensile strength and the elongation at break, of the waterproof breathable film can be greatly improved, and on the other hand, the waterproof breathable performance of the waterproof breathable film can be further improved, so that the waterproof breathable film has larger moisture permeability. In order to improve the dispersion uniformity of the modifier in the polypropylene, the modifier is added into the polypropylene modifier, and is a mixture of 4, 4 '-diamino-2, 2' -dinitrodiphenylmethane, dimethylmaleic anhydride and 1, 2-epoxy-4-vinyl cyclohexane, so that the modifier can be dispersed in the polypropylene more uniformly under the combined action of the substances, and the modification effect of the modifier is greatly improved.

In addition, the invention also adds a coupling agent which is a mixture of (1-fluoroethylene) methyl diphenylsilane and vinyl-tri (2-methoxyethoxy) silane, and the coupling agent plays a role in coupling, so that the inorganic filler, the polypropylene and all components have better compatibility, and the waterproof and breathable properties and various mechanical properties of the waterproof and breathable film are further improved.

The finally prepared polypropylene waterproof breathable film has strong waterproof and breathable performance, large moisture permeability, and high tensile strength and elongation at break.

Detailed Description