CN-121975457-A - Preparation method and application of wheat starch adhesive suitable for paper cultural relic repair

Abstract

The invention belongs to the technical field of cultural relic protection, and particularly relates to a preparation method and application of a wheat starch adhesive suitable for paper cultural relic restoration. The preparation method of the wheat starch adhesive suitable for paper cultural relics comprises the following steps of S1, dissolving plant proteolytic enzyme in water, stirring uniformly to obtain a plant proteolytic enzyme solution, S2, adding wheat flour into the plant proteolytic enzyme solution, stirring uniformly, S3, further performing centrifugal separation, washing and dehydrating and drying the obtained solid product for multiple times to obtain wheat starch, and S4, gelatinizing the wheat starch to obtain the wheat starch adhesive. The wheat flour is treated by the plant proteolytic enzyme, so that protein combined with the wheat starch can be removed efficiently, the wheat starch with higher purity and dispersed particle morphology is released, and then the formed wheat starch adhesive can remarkably improve the folding endurance and tensile strength of paper in paper cultural relics restoration.

Inventors

• LUO YUJIA
• LI YUHU
• CHEN JIAWEI
• ZHOU YAJUN
• Qi Binpeng
• YANG GUAN
• GUO JINGYANG
• GUO NING
• Yin Zhongrun
• LI XIANGHUI

Assignees

• 陕西师范大学

Dates

Publication Date

20260505

Application Date

20260313

Claims (8)

1. 1. The preparation method of the wheat starch adhesive for repairing paper cultural relics is characterized by comprising the following steps of: s1, dissolving plant proteolytic enzyme in water, and uniformly stirring to obtain a plant proteolytic enzyme solution; s2, adding the wheat flour into the plant proteolytic enzyme solution of the S1, and uniformly stirring; S3, carrying out centrifugal separation on the product stirred uniformly in the step S2, and washing, dehydrating and drying the obtained solid product for multiple times to obtain wheat starch; And S4, gelatinizing the wheat starch to obtain the wheat starch adhesive suitable for repairing paper cultural relics.
2. 2. The method for preparing the wheat starch adhesive suitable for paper cultural relics according to claim 1, wherein the plant proteolytic enzyme is one or more of papain, bromelain, ficin, chymosin and soy metalloproteinase.
3. 3. The method for preparing the wheat starch adhesive for paper cultural relics repair according to claim 1, wherein each 50g of wheat flour is added into 300mL of a plant proteolytic enzyme solution, and the mass concentration of the plant proteolytic enzyme solution is 0.5% -2%.
4. 4. The preparation method of the wheat starch adhesive for paper cultural relics repair according to claim 1, wherein in the step S2, stirring is carried out at a temperature of 35-40 ℃, a speed of 400-600 rpm and a time of 10-12 h.
5. 5. The preparation method of the wheat starch adhesive for paper cultural relics repair according to claim 1, wherein in the step S3, the rotation speed of centrifugation is 2500rpm-3000rpm, the centrifugation time is 10min-15min, and the washing times are at least three times.
6. 6. The method for preparing a wheat starch adhesive for paper cultural relics repair according to claim 1, wherein in the step S3, the average grain size of the wheat starch is 18.42 μm.
7. 7. A wheat starch adhesive, characterized in that it is obtained by the preparation method according to any one of claims 1-6.
8. 8. The use of the wheat starch adhesive according to claim 7 for increasing the folding endurance and tensile strength of paper.

Description

Preparation method and application of wheat starch adhesive suitable for paper cultural relic repair Technical Field The invention belongs to the technical field of cultural relic protection, and particularly relates to a preparation method and application of a wheat starch adhesive suitable for paper cultural relic restoration. Background Paper cultural relics are non-renewable precious documents, have great protection value, however, in long-term storage, paper is affected by environmental factors, and breakage, tearing and the like often occur. Therefore, the paper cultural relics need to be repaired. Paper cultural relics are restored to stabilize their physical state, delay degradation, and restore their historic and cultural value as much as possible by minimal intervention. In the existing repairing method, broken paper can be firmly bonded together by adopting the wheat starch adhesive, the integrity of ancient books is recovered, the viscosity of the wheat starch adhesive can be well adapted to the material of the paper, the paper is not easy to separate again when the repaired ancient books are turned over, chemical corrosion and other damages can not be caused to the paper, the missing part of the paper cultural relics can be complemented by the paper with similar paper texture, and the paper can be pasted at the corresponding position by using the wheat starch adhesive, so that the repaired paper cultural relics are more similar to the original state in appearance and structure. In the pasting process, the adhesive can be uniformly coated on the surface of the paper and can permeate into the fibers of the paper, so that the defect part is tightly attached to the original page, firm combination is realized, good support is provided, no obvious trace is produced, and the original appearance of the ancient book is maintained. The main raw material of the wheat starch adhesive is wheat starch, the existing wheat starch preparation process is complex, a plurality of working procedures are involved, wheat flour and water are mixed into dough, the dough is placed for a period of time, the dough is placed in water and kneaded to remove wheat protein, and finally a series of operations such as impurity filtering, sedimentation and the like are adopted to obtain the wheat starch. Although the adhesive formed by the existing wheat starch can be used for repairing paper cultural relics, in the existing wheat starch preparation, starch and wheat protein are combined together to generate mixed residues, so that when the adhesive is used as the adhesive for repairing the paper cultural relics, the folding endurance and the tensile strength of paper are reduced, and the actual requirements of paper cultural relics on repairing are difficult to meet. Disclosure of Invention Aiming at the technical problems that in the existing wheat starch preparation, starch and wheat protein are combined together to generate mixed residues, so that when the mixed residues are used as an adhesive for repairing paper cultural relics, the folding endurance and the tensile strength of paper are reduced, the invention provides a preparation method and application of the wheat starch adhesive suitable for repairing the paper cultural relics. The wheat flour is treated by the plant proteolytic enzyme, so that protein combined with the wheat starch can be removed efficiently, the wheat starch with higher purity and dispersed particle morphology is released, and then the formed wheat starch adhesive can remarkably improve the folding endurance and tensile strength of paper in paper cultural relics restoration. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: A preparation method of a wheat starch adhesive suitable for paper cultural relics repair comprises the following steps: s1, dissolving plant proteolytic enzyme in water, and uniformly stirring to obtain a plant proteolytic enzyme solution; s2, adding the wheat flour into the plant proteolytic enzyme solution of the S1, and uniformly stirring; S3, carrying out centrifugal separation on the product stirred uniformly in the step S2, and washing, dehydrating and drying the obtained solid product for multiple times to obtain wheat starch; And S4, gelatinizing the wheat starch to obtain the wheat starch adhesive suitable for repairing paper cultural relics. Further defined, the plant proteolytic enzyme is one or more of papain, bromelain, ficin, chymosin and soy metalloproteinase. Further defined, each 50g of wheat flour is added to 300mL of a plant proteolytic enzyme solution, the mass concentration of which is between 0.5% and 2%. Further defined, in step S2, the stirring conditions are a temperature of 35-40 ℃, a speed of 400-600 rpm, and a time of 10-12 hours. Further limited, in step S3, the rotational speed of centrifugation is 2500rpm-3000rpm, the centrifugation time is 10min-15min, and the washing times are at least three times.