Method of preparing soy protein/cellulosic composite fiber with high protein inventory

Abstract

The invention provides a preparation method for soyabean protein / cellulose composite fiber with high protein inventory, belonging to the material field. In the method, sodium hydroxide / sulfourea / urea mixed aqueous solution is used as the solvent for dissolving cellulose to prepare high concentrated cellulose solution, separated soyabean protein is pretreated by the hydroxide / sulfourea / urea mixed aqueous solution to obtain suspending liquid, and sodium hydroxide is added into the obtained suspending liquid for direct dissolution to obtain soyabean protein solution; the cellulose solution and the soyabean protein solution are mixed in proportion and stirred to obtain composite solution, and the composite solution is treated by defoaming, spinning by a spinning machine, solidifying, drafting, washing, drying, oil-applying and winding to prepare soyabean protein / cellulose composite fiber with excellent mechanical property and high protein inventory. The production process avoids the technique of viscose process which is lengthy, complex and seriously polluting.

Description

technical field

[0001] The invention belongs to the field of materials, and relates to a method for preparing soybean protein / cellulose composite fiber with high protein retention. Background technique

[0002] Cellulose is the most abundant natural polymer material in nature, and the source is very rich. It is estimated that the annual output of cellulose in the world is about 150 billion tons. Sources of natural cellulose raw materials include cotton, hemp, wood, bamboo and other higher plants, such as reed, straw, bagasse, etc. Cotton is the cellulose fiber with the highest purity in nature, and its α-cellulose content can reach 92-95%, and about half of wood is cellulose. These cellulose raw materials can be subjected to chemical pulping or biological pulping to obtain cellulose with an α-cellulose content of more than 90%. Cellulose can be synthesized from water and carbon dioxide through photosynthesis, and can be completely degraded by microorganisms in nature, so i...

Examples

Embodiment 1

[0022] Step 1: Prepare 500 grams of a mixed solution containing 7% sodium hydroxide, 4.5% thiourea, 1% urea, and 87.5% water by weight. The solution is pre-cooled to -8°C in a refrigerator, and 10.2 grams of polymerization degree is 1200 The cotton cellulose was quickly added to the pre-cooling solution, and then the temperature of the pre-cooling solution was controlled by using a circulating cooling jacket, and the temperature of the pre-cooling solution was controlled by an electric mixer at a speed of 2000 rpm for 10 minutes under the condition of 0°C. Objective filter screen filtration obtains the cellulose solution that cellulose weight percent is 2%;

[0023]Step 2: Add 125 grams of soybean protein isolate powder with a protein content of 92% and a pH value of 7.0 to 500 grams of the prepared 4.5% by weight thiourea / 1% urea mixed aqueous solution to obtain a 20% soybean protein suspension The solution was stirred and reacted by an electric mixer at room temperature at 2...

Embodiment 2

[0030] Step 1: Prepare 500 grams of mixed solution containing 10% sodium hydroxide, 7% thiourea, 10% urea, and 73% water by weight. Cotton cellulose was quickly added to the pre-cooling solution, and then the temperature of the pre-cooling solution was controlled using a circulating cooling jacket, and the temperature of the pre-cooling solution was controlled at 0°C by an electric mixer at a speed of 2000 rpm for 5 minutes. Screen filtration obtains the cellulose solution of 12% by weight of cellulose;

[0031] Step 2: Add 26.3 grams of soybean protein isolate powder with a protein content of 92% and a pH value of 7.0 to 500 grams of prepared 7% thiourea / 10% urea mixed aqueous solution to obtain 5% soybean protein suspension The solution was stirred and reacted by an electric mixer at room temperature at 2000 rpm for 5 minutes, then 10% by weight of sodium hydroxide was added to the resulting suspension, and the reaction was continued for 5 minutes at room temperature, and th...

Embodiment 3

[0038] Step 1: Prepare 500 grams of mixed solution containing 8% sodium hydroxide, 6.5% thiourea, 8% urea, and 77.5% water by weight. The cotton cellulose was quickly added to the pre-cooling solution, and then the temperature of the pre-cooling solution was controlled by using a circulating cooling jacket, and the temperature of the pre-cooling solution was controlled by an electric mixer at a speed of 2000 rpm for 8 minutes under the condition of 0°C. Objective filter screen filtration obtains the cellulose solution that the cellulose weight percent is 6%;

[0039] Step 2: Add 55.6 grams of soybean protein isolate powder with a protein content of 92% and a pH value of 7.0 to 500 grams of prepared 6.5% thiourea / 8% urea mixed aqueous solution to obtain 10% soybean protein suspension The solution was stirred and reacted by an electric mixer at room temperature at a speed of 2000 rpm for 30 minutes, then 8% by weight of sodium hydroxide was added to the resulting suspension, and...

technical field

[0001] The invention belongs to the field of materials, and relates to a method for preparing soybean protein / cellulose composite fiber with high protein retention. Background technique

[0002] Cellulose is the most abundant natural polymer material in nature, and the source is very rich. It is estimated that the annual output of cellulose in the world is about 150 billion tons. Sources of natural cellulose raw materials include cotton, hemp, wood, bamboo and other higher plants, such as reed, straw, bagasse, etc. Cotton is the cellulose fiber with the highest purity in nature, and its α-cellulose content can reach 92-95%, and about half of wood is cellulose. These cellulose raw materials can be subjected to chemical pulping or biological pulping to obtain cellulose with an α-cellulose content of more than 90%. Cellulose can be synthesized from water and carbon dioxide through photosynthesis, and can be completely degraded by microorganisms in nature, so i...

Examples

Embodiment 1

[0022] Step 1: Prepare 500 grams of a mixed solution containing 7% sodium hydroxide, 4.5% thiourea, 1% urea, and 87.5% water by weight. The solution is pre-cooled to -8°C in a refrigerator, and 10.2 grams of polymerization degree is 1200 The cotton cellulose was quickly added to the pre-cooling solution, and then the temperature of the pre-cooling solution was controlled by using a circulating cooling jacket, and the temperature of the pre-cooling solution was controlled by an electric mixer at a speed of 2000 rpm for 10 minutes under the condition of 0°C. Objective filter screen filtration obtains the cellulose solution that cellulose weight percent is 2%;

[0023]Step 2: Add 125 grams of soybean protein isolate powder with a protein content of 92% and a pH value of 7.0 to 500 grams of the prepared 4.5% by weight thiourea / 1% urea mixed aqueous solution to obtain a 20% soybean protein suspension The solution was stirred and reacted by an electric mixer at room temperature at 2...

Embodiment 2

[0030] Step 1: Prepare 500 grams of mixed solution containing 10% sodium hydroxide, 7% thiourea, 10% urea, and 73% water by weight. Cotton cellulose was quickly added to the pre-cooling solution, and then the temperature of the pre-cooling solution was controlled using a circulating cooling jacket, and the temperature of the pre-cooling solution was controlled at 0°C by an electric mixer at a speed of 2000 rpm for 5 minutes. Screen filtration obtains the cellulose solution of 12% by weight of cellulose;

[0031] Step 2: Add 26.3 grams of soybean protein isolate powder with a protein content of 92% and a pH value of 7.0 to 500 grams of prepared 7% thiourea / 10% urea mixed aqueous solution to obtain 5% soybean protein suspension The solution was stirred and reacted by an electric mixer at room temperature at 2000 rpm for 5 minutes, then 10% by weight of sodium hydroxide was added to the resulting suspension, and the reaction was continued for 5 minutes at room temperature, and th...

Embodiment 3

[0038] Step 1: Prepare 500 grams of mixed solution containing 8% sodium hydroxide, 6.5% thiourea, 8% urea, and 77.5% water by weight. The cotton cellulose was quickly added to the pre-cooling solution, and then the temperature of the pre-cooling solution was controlled by using a circulating cooling jacket, and the temperature of the pre-cooling solution was controlled by an electric mixer at a speed of 2000 rpm for 8 minutes under the condition of 0°C. Objective filter screen filtration obtains the cellulose solution that the cellulose weight percent is 6%;

[0039] Step 2: Add 55.6 grams of soybean protein isolate powder with a protein content of 92% and a pH value of 7.0 to 500 grams of prepared 6.5% thiourea / 8% urea mixed aqueous solution to obtain 10% soybean protein suspension The solution was stirred and reacted by an electric mixer at room temperature at a speed of 2000 rpm for 30 minutes, then 8% by weight of sodium hydroxide was added to the resulting suspension, and...