Method for molding protein resin

Abstract

To provide a novel method for molding a protein resin.SOLUTION: There is provided a novel method for molding a protein resin, including: a first step of adjusting a moisture content of a keratin-containing powder; and a second step of injecting the keratin-containing powder with the adjusted moisture content into a mold while being heated and compressed, wherein in the first step, (1) the moisture content is adjusted to 45 wt.% or more, or (2) the moisture content of the keratin-containing powder containing a plant powder is adjusted to 30 wt.% or more by adding the plant powder in an amount of one-ninth or more and one-fourth or less by weight of the keratin-containing powder.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a method for molding a protein resin.

Background Art

[0002] A method for producing a protein molded body containing feathers, which can be used as a substitute for protein plastics such as casein plastics or shells, has been developed (see Patent Document 1). In this production method, a slurry-like mixture in which 30 to 50% by weight of water is mixed with respect to the amount of feathers is hot press molded at a pressure of 80 kg / cm 2 or more and a temperature of 95°C or more to obtain a molded body having a water content of 5 to 9% by weight.

[0003] However, it is said that the above method has a problem that when the particle size of the feathers is made into fine powder of 40 μm or less, the powders become dumpling-like. To solve this problem, feathers, wool, hair or animal hair that have not been treated with chemicals are pulverized into powder by mechanical force until the fiber length becomes 500 μm or less, and distilled water is added to the powder so as to be in the range of 0 to 30% by mass with respect to 100% by mass of the mixture of the powder and distilled water and uniformly mixed. After hot press molding this mixture at a temperature in the range of 120 to 140°C under a pressure of at least 20 MPa using a pulse current sintering apparatus in a vacuum of 6.0 Pa or less, a method for producing a keratin-derived bioplastic molded body by drying has been developed (see Patent Document 2).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] The object of the present invention is to provide a novel molding method for protein resin.

Means for Solving the Problems

[0006] The inventors of the present invention have made intensive efforts to develop a production method of protein resin suitable for transfer molding or injection molding with higher molding freedom rather than hot press molding as in the prior art. As a result, they have found that it can be realized by the following method, leading to the completion of the present invention.

[0007] That is, one embodiment of the present invention includes a first step of adjusting the moisture content of keratin-containing powder, and a second step of injecting the keratin-containing powder with adjusted moisture content into a mold while heating and compressing it. In the first step, (1) the moisture content is adjusted to 45% by weight or more, or (2) plant powder is added in an amount of 1 / 9 or more and 1 / 4 or less by weight of the keratin-containing powder, and the moisture content of the keratin-containing powder containing the plant powder is adjusted to 30% by weight or more. It is a molding method of protein resin.

[0008] Another embodiment of the present invention is a protein resin composition containing keratin-containing powder and having a moisture content of 45% by weight or more, or containing keratin-containing powder and plant powder in a ratio of 4 to 9:1 and having a moisture content of 30% by weight or more.

[0009] The plant powder may be spinach powder or mugwort powder.

Effects of the Invention

[0010] The present invention has made it possible to provide a novel molding method for protein resin.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Mode for Carrying Out the Invention

[0012] The object, features, advantages, and ideas of the present invention are clear to those skilled in the art from the description in this specification, and those skilled in the art can easily reproduce the present invention from the description in this specification. The embodiments and specific examples of the invention described below show preferred embodiments of the present invention and are shown for illustration or explanation, and do not limit the present invention thereto. It is clear to those skilled in the art that various modifications and improvements can be made based on the description in this specification within the intention and scope of the present invention disclosed in this specification. ==Method for Molding Protein Resin== One embodiment of the present invention is a method for molding a protein resin, which includes a first step of adjusting the water content rate of a keratin-containing powder to a predetermined range, and a second step of injecting the keratin-containing powder with adjusted water content into a mold while heating and compressing it. In this way, by adjusting the water content rate of the keratin-containing powder to an appropriate range, in the second step, the protein resin can be molded into a precise shape.

[0013] The keratin-containing powder can be obtained by making fine powder of animal-derived hair such as feathers, wool, hair or animal hair, nails or keratinized cells, etc. by chemical treatment such as hydrolysis with alkali or mechanical treatment such as shear. The average particle size of this fine powder is preferably 10 μm or more, more preferably 20 μm or more, still more preferably 30 μm or more. Also, it is preferably 500 μm or less, more preferably 400 μm or less, still more preferably 300 μm or less, and even more preferably 300 μm or less. [1] First step In the first step, (1) the water content of the keratin-containing powder is adjusted to 45% by weight or more, or (2) the plant powder is added in an amount of 1 / 9 or more and 1 / 4 or less by weight of the keratin-containing powder, and the water content of the whole keratin-containing powder containing the plant powder is adjusted to 30% by weight or more. Hereinafter, each case will be described in detail. (1) For adjusting the water content of the keratin-containing powder, it is preferable to add water. However, since the keratin-containing powder already contains water, the water content is 100x (weight of added water + water content of keratin-containing powder) / (weight of added water + weight of keratin-containing powder) calculated by.

[0014] Here, the final water content of the keratin-containing powder is preferably 45% by weight or more or more than 45% by weight, more preferably 50% by weight or more or more than 50% by weight, still more preferably 53% by weight or more or more than 53% by weight. Also, it is preferably 70% by weight or less or less than 70% by weight, more preferably 60% by weight or less or less than 60% by weight, still more preferably 55% by weight or less or less than 55% by weight, and even more preferably 54% by weight or less or less than 54% by weight. (2) First, plant powder is added to the keratin-containing powder. The addition amount is preferably 1 / 9 or more by weight of the keratin-containing powder, more preferably 1 / 8 or more, preferably 1 / 4 or less, and more preferably 1 / 5 or less. The plant used as the raw material for the plant powder is not particularly limited, but it is preferably spinach, mugwort, coffee residue, banana peel, etc.

[0015] The plant powder can be obtained by making the above raw materials into fine powder by chemical treatment such as hydrolysis with alkali or mechanical treatment such as shear. The average particle size of this fine powder is preferably 10 μm or more, more preferably 20 μm or more, and even more preferably 30 μm or more. Also, it is preferably 500 μm or less, more preferably 400 μm or less, and even more preferably 300 μm or less. The average particle size of the plant powder may be the same as or different from the average particle size of the keratin-containing powder, but it is preferable that one is within 2 times that of the other.

[0016] To adjust the moisture content of the keratin-containing powder, it is preferable to add water. However, since the keratin-containing powder and the plant powder contain water, the moisture content is 100 x (weight of added water + moisture content of keratin-containing powder + moisture content of plant powder) / (weight of added water + weight of keratin-containing powder + weight of plant powder) can be calculated.

[0017] Here, the final moisture content of the keratin-containing powder containing the plant powder is preferably 20% by weight or more, more preferably 30% by weight or more, still more preferably 31% by weight or more, and preferably 45% by weight or less, more preferably 41% by weight or less, still more preferably 35% by weight or less. Thus, by adding the plant powder, the final moisture content of the keratin-containing powder for molding the protein resin into a precise shape can be reduced. [2] Second step In the second step, the keratin-containing powder whose moisture content has been adjusted in the first step is injected into the mold while being heated and compressed. By appropriately adjusting the moisture content of the keratin-containing powder in the first step in advance, transfer molding or injection molding with a higher degree of molding freedom can be performed thereafter.

[0018] The method of transfer molding or injection molding is not particularly limited, and known methods can be used. For example, after filling the raw material into a raw material filling part such as a pot, the raw material is pressurized to uniformly apply pressure by passing through a thin flow path connected to the raw material filling part, and the raw material can be molded by injecting it into the cavity of the heated mold from the injection hole.

Example

[0019] [Example 1] In this example, it is shown that the protein resin derived from the keratin-containing powder can be transfer molded by adjusting the moisture content of the keratin-containing powder to 45% by weight or more.

[0020] The keratin-containing powder was prepared by manually cutting commercially available dry wool (manufactured by Hamana Kaisha, Felted Wool Natural Merino) into 1 cm squares in advance, and then repeating the process of crushing for 1 minute and standing still for 1 minute at <300 rpm> 10 times using a planetary ball mill (manufactured by FRITSCH, P-6) until it was pulverized into fine powder with an average diameter of 30 μm. For the crushing, 20 alumina balls with a diameter of 15 mm and 15 alumina balls with a diameter of 20 mm were used respectively.

[0021] The obtained keratin-containing powder was added with water to reach the final water content as shown in Table 1 and mixed. Then, while heating and compressing at 150 °C under the condition of 24.8 Mpa, it was injected into a mold at a curing time of 10 minutes and a feeding speed of 100 mm / second. When the state of the molded product was uniform, it was evaluated as ○, and when it could not be molded or was non-uniform, it was evaluated as ×. [Table 1] TIFF2025089065000002.tif37170

[0022] As shown in Figure 1, the molding of Sample A was incomplete, and the molding of Sample B was non-uniform. On the other hand, the molding of Samples C and D was uniform.

[0023] Thus, by setting the final water content to 45%, the state of the molded product became good. [Example 2] In this example, by adding plant powder to the keratin-containing powder to about 10% (final concentration) and adjusting the water content of the keratin-containing powder to 45 wt% or more, it is shown that the protein resin derived from the keratin-containing powder can be transfer molded.

[0024] The keratin-containing powder was produced in the same manner as in Example 1.

[0025] The plant powders were prepared by drying commercially available spinach (Sample E) and mugwort (Sample F) in a household food dryer (manufactured by Labonect Co., Ltd., household vegetable and fruit dryer Doramin) at 60°C for 18 hours, then putting them into a household grinder (manufactured by Labonect Co., Ltd., Fine Powder Mill FM-100), grinding for about 2 minutes, and making them into fine powders with an average diameter of 50 μm for use.

[0026] The obtained keratin-containing powder and the plant powder were mixed at a ratio of 88:12 (weight ratio), water was added to achieve the final water content as shown in Table 2, and after further mixing, they were molded and evaluated in the same manner as in Example 1. [Table 2] TIFF2025089065000003.tif29170

[0027] As shown in Figure 2, for Samples E and F, the molding was uniform.

[0028] Thus, by adding the plant powder to the keratin-containing powder to a final concentration of about 10%, the state of the molded product was good even at a lower water content.

Claims

1. a first step of adjusting the moisture content of the keratin-containing powder; a second step of injecting the keratin-containing powder with adjusted moisture content into a mold while heating and compressing it; comprising; In the first step, (1) the moisture content is adjusted to 45% by weight or more, or (2) plant powder is added in an amount of 1 / 9 or more and 1 / 4 or less by weight of the keratin-containing powder, and the moisture content of the keratin-containing powder containing the plant powder is adjusted to 30% by weight or more, A method for molding a protein resin.

2. The molding method according to claim 1, wherein the plant powder is spinach or mugwort powder.

3. The molding method according to claim 1 or 2, wherein the average particle size of the keratin-containing powder and the plant powder is 10 μm or more and 500 μm or less.

4. containing a keratin-containing powder, and the moisture content is 45% by weight or more, or containing a keratin-containing powder and a plant powder in a ratio of 4 to 9:1, and the moisture content is 30% by weight or more, A protein resin composition.

5. The protein resin composition according to claim 4, wherein the plant powder is spinach or mugwort powder.

6. A protein resin composition, wherein the average particle size of the keratin-containing powder and the plant powder is 10 μm or more and 500 μm or less.

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