TW201425688A - Pulp compositions and uses of the same - Google Patents

Abstract

A pulp composition is provided. The pulp composition comprises a pulp and aluminum oxide powder, wherein the amount of the aluminum oxide powder is about 3 parts by weight to about 45 parts by weight per 100 parts by weight of the pulp (based on the solid content). The pulp composition is useful for the preparation of pulp molding products that have outstanding strength and water-proof property and moisture resistance.

Description

Pulp composition and its application

The present invention relates to a pulp composition, and more particularly to a pulp composition containing alumina powder for use in preparing a pulp molded article.

With the increasing popularity of environmental protection concepts, the application range of pulp molded products is becoming more and more extensive, and in the fields of food, medicine, daily chemicals, industrial products, etc., specific examples of applications include industrial packaging (such as home appliances, glass ceramics, gifts, etc.) Shockproof packaging), trays (such as trays for eggs and fruits), medical disposable supplies (such as urinals, toilet seats, surgical trays, etc.), flower pots, toys (such as masks), food containers (such as paper cups), plates (such as decorative wall panels) and so on. However, the pulp molded products obtained by simply using plant fibers are not suitable for waterproofing, and are only suitable for dry storage conditions (such as dry goods or food storage, dry storage environments, etc.), and are not suitable for containing water ( The product of the oil) can only be stored for a short period of time and is not suitable for storage in a humid environment, which is a limitation of its application.

In order to improve the disadvantages of the above-mentioned existing pulp molded article, the present invention provides a pulp composition for preparing a pulp molded article, whereby the pulp molded article obtained has excellent strength and waterproof (wet resistance) property.

An object of the present invention is to provide a pulp composition comprising: a pulp; and an alumina powder, wherein the alumina powder is contained in an amount of about 3 parts by weight per 100 parts by weight of the pulp (as solid matter) About 45 parts by weight.

Another object of the present invention is to provide a pulp molded article which is obtained by subjecting the above pulp composition to a hot press forming mold and performing hot press drying.

The above described objects, technical features and advantages of the present invention will become more apparent from the following detailed description.

The invention will be described in detail below with reference to the specific embodiments of the present invention. The invention may be practiced in various different forms without departing from the spirit and scope of the invention. The person stated. In addition, the terms "a", "an" and "the" And unless otherwise stated herein, the ingredients contained in the pulp composition are described in this specification as being based on the solids contained in the composition, i.e., the weight of the solvent (e.g., water) is not included.

The inventors of the present invention have found that the incorporation of alumina powder into the pulp enhances the strength and waterproof (wet resistance) properties of the pulp molded article obtained from the pulp. Accordingly, one of the pulp compositions of the present invention is characterized in that the composition comprises alumina powder.

In particular, the pulp composition of the present invention comprises pulp and alumina powder, wherein the strength of the molded article obtained from the pulp composition is enhanced by adhering alumina powder to the surface of the plant fiber. The coating of alumina powder improves the waterproof (wet resistance) performance of the pulp molded article. In order to obtain a higher adhesion of the alumina powder to the plant fiber, the alumina powder to be added is preferably an alumina nanopowder having a nanometer size.

In the pulp composition of the present invention, the amount of the alumina powder added is not particularly limited. In general, the addition of from about 3 parts by weight to about 45 parts by weight, preferably from about 8 parts by weight to about 20 parts by weight, of the alumina powder per 100 parts by weight of the pulp (based on solids) provides the desired strength and Waterproof (wet resistance) improved. In some embodiments of the present invention, the alumina powder is added in an amount of about 13 parts by weight per 100 parts by weight of the pulp (as solids). Further, the type of pulp which is suitable for use in the pulp composition of the present invention is not particularly limited, and may be any commercially available pulp which is available or self-adapted by the user. Examples of common pulps include, but are not limited to, wood pulp, sugar cane pulp, cotton pulp, hemp pulp, bamboo pulp, mash pulp, straw pulp, or any combination of the foregoing.

In the pulp composition of the present invention, an adhesion agent may be further added to assist the adhesion of the alumina powder to the plant fiber to provide a further improvement effect. The adhesive agent can be polypropylene decylamine, vegetable starch, or a combination thereof. For example, every 100 The parts by weight of the pulp (in terms of solid content) may be added in an amount of from about 0.5 part by weight to about 5 parts by weight, preferably from about 1.5 parts by weight to about 3 parts by weight, based on the theoretical limit; The acrylamide can enhance the affinity between the plant fiber and the alumina powder contained in the pulp, and improve the adhesion strength of the alumina powder. Alternatively, from about 1 part by weight to about 12 parts by weight, preferably from about 3 parts by weight to about 6 parts by weight, of the plant starch may be added per 100 parts by weight of the pulp (based on the solids); The plant fiber can form a hydrogen bond with the plant starch, enhance the adhesion of the plant fiber, and thereby promote the adhesion of the alumina powder. In the pulp composition of the present invention, the adhesive agent may be added in other amounts, as long as it can provide the desired adhesion enhancement effect, and is not limited to the above-mentioned addition amount.

In addition to the adhesion agent, polyethylene may also be added to the pulp composition of the present invention. Without being bound by theory, the salty polyethylene can cause the plant fibers in the composition to be well extended and thus improved due to its linear structure. Plant fiber strength, therefore, can be used as an adhesive for plant fibers in pulp. In general, the polyethylene may be added in an amount of from about 1 part by weight to about 45 parts by weight per 100 parts by weight of the pulp (based on the solids), and preferably from about 5 parts by weight to about 20 parts by weight, but not This is limited to this. Of course, other conventional additives may be added to the pulp composition of the present invention to provide additional gain effects. For example, an additive selected from the group consisting of a water repellent, an oil repellent, a water and oil repellent, a surfactant, and any combination of the foregoing may be added to the pulp composition, wherein a specific example of the water and oil repellent such as fluorine is waterproof. Oil repellent, antimony and oil repellent or a combination thereof.

The preparation method of the pulp composition of the present invention is not particularly limited, and it can be formulated by a conventional pulp blending method. For example, the pulp can be placed in the slurry first. Prepare the desired concentration in the machine, then grind the prepared pulp to the desired freeness with a refiner as needed, then input it into the pulper, and add alumina powder and additives as needed. The pulp composition of the present invention is obtained by uniformly mixing the components.

The pulp composition of the present invention can be used in a pulp molding technique for preparing a pulp molded article. Accordingly, the present invention further provides a pulp molded article obtained by subjecting the pulp composition of the present invention to a hot press forming die for hot press drying. The hot press molding die and the hot press drying step can be achieved by any conventional means without particular limitation. For example, the pulp composition of the present invention may be injected into a forming mold comprising a net mold, the pulp composition is covered with the net mold, followed by vacuum evacuation to remove moisture to form a wet blank, and then the wet blank is moved to a The hot press setting die is subjected to hot press drying to obtain a pulp molded article.

The present invention will be further illustrated by the following specific embodiments in which the measurement methods employed are as follows.

[Strength Test]

The strength of the pulp molded article was tested in accordance with the ASTM D642, ISO 12048, and CNS 2543/3511 standard test methods.

[Water resistance test]

The pulp molded article was impregnated with water at normal temperature for 60 minutes, and then the moisture content of the pulp molded article was examined. The lower the water content, the more excellent the water repellency.

[Preparation of pulp composition] <Example 1>

The pulp composition, the alumina powder, the water repellent agent and the oil repellent were uniformly mixed in a slurry tank at a ratio as shown in Table 1, to obtain a pulp composition 1.

<Example 2>

Pulp, alumina powder, polypropylene decylamine, vegetable starch, polyethylene, water repellent and oil repellent were uniformly mixed in a slurry tank at a ratio as shown in Table 1, to obtain a pulp composition 2.

<Comparative Example 1>

Comparative pulp composition 1 was prepared in the same manner as in Example 1, except that alumina powder was not used, and the proportion of pulp components was adjusted correspondingly, as shown in Table 1.

<Comparative Example 2>

Comparative pulp compositions were prepared in the same manner as in Example 2 except that alumina powder was not used and the proportion of pulp components was adjusted correspondingly as shown in Table 1.

[Preparation of pulp molded products]

A pulp molded article was prepared using the pulp composition 1 and the pulp composition 2 of Examples 1 and 2 and the comparative pulp composition 1 and Comparative pulp composition 2 of Comparative Examples 1 and 2, respectively. Specifically, the pulp composition is injected into a molding die and carried out Vacuum pumping to remove moisture to form a wet blank, and placing the wet blank between the upper mold and the lower mold of the shaping mold and performing hot pressing (temperature: 240 ° C; pressure: 30 metric tons; hot pressing time: 40 seconds), Pulp molded products. The strength and water repellency of the pulp molded articles were tested, and the results are reported in Table 2.

As can be seen from Table 2, the pulp composition of the present invention can greatly improve the strength and water resistance of the thus obtained pulp molded article by the addition of the alumina powder compared to the pulp composition containing no alumina powder (water percentage) Low) (See Example 1 and Comparative Example 1). In addition, the strength and water resistance of the pulp molded article can be further improved by the addition of the adhesive. Therefore, the high-strength pulp molded article obtained by using the pulp composition of the present invention can be applied to long-term loading of products containing water and oil, and can also effectively resist the humid environment when used as a general storage container. The contents are damp.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are illustrative of the technical features of the present invention and are not intended to limit the scope of the present invention. Any changes or arrangements that can be easily accomplished by those skilled in the art without departing from the technical principles and spirit of the invention are within the scope of the invention. Accordingly, the scope of the invention is set forth in the appended claims.

Claims (10)

A pulp composition comprising: a pulp; and an alumina powder, wherein the alumina powder is present in an amount of from about 3 parts by weight to about 45 parts by weight per 100 parts by weight of the pulp (as solids). The pulp composition of claim 1, wherein the alumina powder is an alumina nano powder. The pulp composition of claim 1, wherein the alumina powder is present in an amount of from about 8 parts by weight to about 20 parts by weight per 100 parts by weight of the pulp (based on solids). The pulp composition of claim 1 further comprising polypropylene decylamine in an amount of from about 0.5 part by weight to about 5 parts by weight per 100 parts by weight of the pulp (based on solids). The pulp composition of claim 1 further comprising vegetable starch in an amount of from about 1 part by weight to about 12 parts by weight per 100 parts by weight of the pulp (based on solids). The pulp composition of claim 1 further comprising polyethylene in an amount of from about 1 part by weight to about 45 parts by weight per 100 parts by weight of the pulp (based on solids). The pulp composition according to any one of claims 1 to 6, further comprising an additive selected from the group consisting of a water repellent, an oil repellent, a water and oil repellent, a surfactant, and any combination of the foregoing. The pulp composition of claim 7, wherein the water and oil repellent is a fluorine-based waterproof and oil-proof Agent, hydrazine waterproof and oil repellent or a combination thereof. The pulp composition of any one of claims 1 to 6, wherein the pulp is selected from the group consisting of wood pulp, sugar cane pulp, cotton pulp, hemp pulp, bamboo pulp, mash pulp, straw pulp, and the foregoing. random combination. A pulp molded article obtained by subjecting a pulp composition according to any one of claims 1 to 9 to a hot press molding die for hot press drying.