CN109762488B - Modified adhesive for paper cultural relics and preparation method thereof - Google Patents
Modified adhesive for paper cultural relics and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a modified adhesive for paper cultural relics, which comprises the following components in parts by weight: 90-99.5 parts of wheat starch, 0.5-10 parts of a modification additive and 900 parts of water, wherein the amylose content in the wheat starch is 15-30%, and the amylopectin content is 70-85%; the modifying additive is one or more of compounds capable of reacting with hydroxyl and/or carboxyl. The modified adhesive for the paper cultural relics has the advantages of improved pH value, medium alkalinity, moderate viscosity, moderate stripping degree, certain mildew resistance and good hand feeling in actual use, and the coated paper has better performances in tensile strength, tearing strength, folding strength, aging strength, pH value, contact angle and aging performance.
Description
Technical Field
The invention relates to an adhesive composition, in particular to a modified adhesive for paper cultural relics. The invention also relates to a preparation method of the adhesive.
Background
The paper cultural relics belong to organic cultural relics and are easily affected by factors such as illumination, temperature and humidity, harmful gases, worm damage, rat bite, mould and the like, so that diseases are generated. The traditional repairing technology can effectively protect the paper cultural relics, and the repaired and mounted paper cultural relics can remove some hidden trouble and diseases per se and prolong the vitality of the paper cultural relics; and the paper cultural relics can be firmer and more beautiful, and are convenient to store and display.
The history of repairing and mounting paper cultural relics in China is long, and according to the earliest unearthed real object which can be seen at present, silk paintings which are mounted appear as early as 1500 years ago, and the records of repairing and mounting paper cultural relics in the past documents are all concerned.
The paper cultural relics are repaired and mounted through a plurality of process links. The adhesive is used as a bridge for connecting the paper cultural relic body with various repairing and mounting materials, occupies an important position in the paper cultural relic repairing in the manufacturing and application, and is an important ring for the protection and repairing effects in the traditional repairing technology. How to enable the repaired paper cultural relics to become moderate in adhesion, soft and smooth, and have the effects of insect prevention, mildew prevention and the like, is a key point and a breakthrough point which need to be solved by the current paper cultural relic repair protective material-adhesive. To better achieve these goals, one must start with both raw materials and preparation of the adhesive.
The ancient people have long recognized the influence of paste, an adhesive, on the quality of paper products such as calligraphy and painting, ancient books and the like, made beneficial exploration and practice, and made records for summarizing and explaining the traditional paste making process. The following items are now listed.
The Tang Dynasty is well emphasized in book III "book of ancient famous paintings" book of backing and mounting shafts: when the paste is boiled, the gluten must be removed, the paste is diluted and obtained, and the paste is naturally cooked without stopping stirring. The rest of the ingredients are often added into the finely ground powder of the Lavender, which is rather dull and firm, and never thinks of by ancient people. ";
the decoration records of the world of the Ming dynasty have 'paste treatment' and 'paste application', wherein the 'paste treatment' chapter is described as follows: firstly, the pepper is boiled into soup, the pepper is filtered out, the crock is kept clean and kept cold, and the white flour is gradually swirled and slightly crushed to make the white flour slowly sink but not stirred. After one night, mix well in the morning. If the tea is soaked for several days, the tea needs to be stirred once in the morning. "further, it" with paste "describes: "the surface is pasted and the surface is pasted. The ink is made by glue, and the surface is pasted. When glue is used, it can clear deficiency of the liquid, and when paste is used, it is comfortable and warm. It should be called, Yan Ji 23224. The paste is used by good industry, for example, the paste is used with clear water, and the paste is used for brushing more. "
There are also records in "long material records" book five "Fa paste" of the Ming Dynasty and civilian Shaheng: 'French paste' is made up through immersing the raw materials in water in a earthen basin, immersing the raw materials in water, floating and sinking, immersing bletilla tuber in clean water for half two days and alum for three minutes, removing dregs and immersing in flour, kneading, boiling, removing water, pouring out water, cooling, immersing in water, and mixing with concentrated paste and broom. At the same time, the book also proposes to incorporate beeswax into the paste to achieve a moisturising effect, and to add perfume powder to achieve insect repellent and strengthening.
The Qing Dynasty's prescription, wisdom, in his book, physical wisdom, book eight "decoration law", describes the method of adding drugs to paste according to different seasons, wherein: the Chinese honeylocust fruit, the talcum, the alum, the pericarpium zanthoxyli and the yellow wax oil are respectively one or two; wax, alum and moxa are respectively used in summer, and the wax, the alum and the moxa are respectively used in summer, the diamond, the cochinchina momordica seed, the gentiana macrophylla, the bletilla striata and the turnip are respectively used in two halves, a little croton and the saponin are used in a straight shape; in autumn, a little spirifer is added; yellow wax, alum, sal ammoniac, tuckahoe, salt, wheat flour and bread are used for winter. "
In recent times, the raw materials and the preparation method of the adhesive for repairing and mounting the paper cultural relics are greatly different due to different climates and different repairing and mounting genres. The technology for repairing and mounting paper cultural relics in the south and the north gradually forms adhesive preparation modes with various characteristics in order to adapt to the climatic environment of the area. In order to enhance the adhesion effect of the adhesive and enhance the anti-mold and anti-insect effects, some anti-insect drugs or substances such as alum, bletilla striata, pericarpium zanthoxyli, glycerin, etc. are added into the adhesive during the preparation of the adhesive.
Nowadays, with the development of society, many traditional techniques are not well inherited, the adhesive for repairing and mounting paper cultural relics and the formula recorded in ancient books have come and go, the formula for making paste recorded in ancient books has lost the practical significance, and the application and practice are not good.
At present, according to the results of field research, the preparation of the traditional adhesive for paper cultural relics in China mainly forms a south-north style, wherein the south style (soda mount) mainly comprises flour, and the north style (Beijing mount) mainly comprises starch. In the derivative system which is divided by different raw materials, two preparation methods of a punching method and a boiling method are respectively derived. In the same way, alum is generally added as an additive in the manufacturing process of the adhesive, and no other material capable of replacing alum is found at present.
Alum (also known as alum and alunite), inorganic compounds, water-containing double salts of potassium sulfate and aluminum sulfate, colorless transparent crystal, is the product obtained by processing and refining sulfate mineral alunite, and mainly contains water-containing aluminum potassium sulfate (KAl (SO)4)2·12H2O), aqueous solutions have astringent taste and are commonly used to clarify water. The adhesive has the advantages that the adhesive can increase the viscosity of the adhesive and prevent the adhesive from deteriorating due to fermentation in the process of manufacturing the adhesive for paper cultural relics; the defect is that alum is easy to hydrolyze to generate acid substances, which can reduce the pH value of the adhesive, the polymerization degree of paper and the like, thereby affecting the durability of mounting materials such as paper, silk and the like, which are not beneficial to the long-term storage of paper cultural relics.
In the mounting and repairing process, the adhesive is manufactured completely according to experience due to the fact that scientific use of the adhesive is not noticed, teachers and students often transmit the adhesive to the ears, the scientific material standards and the definite raw material proportion are not provided, and the mounting effect of paper cultural relics is uneven to a great extent, and the mounting quality is not uniform. These hidden troubles are not easily exposed in a short time after the repair is completed, and after long-time wear-out, the problems of improper use of the adhesive are gradually revealed: the poor quality of the adhesive is caused by the incomplete formula of the adhesive, so that the paper cultural relics are damaged by curling, breaking and the like; the improper use of the additive can not only play a role in preventing mildew and calabash, but also accelerate the mildew speed of the paper cultural relics and aggravate the aging degree of the paper cultural relics; in addition, the traditional manufacturing process of the adhesive for the paper cultural relics has limitations in a inheritance way, and the manufacturing formula and the manufacturing process of the adhesive are lost to different degrees. In view of the existing paper cultural relics in the library, a plurality of paper cultural relics have the problems, so that a large number of paper cultural relics face the situation of self-destruction, and the repair is urgently needed.
In order to better realize the long-term preservation of the paper cultural relics, the use of the adhesive is very important, and the problem that how to exert the beneficial factors of the adhesive in the repair and mounting of the paper cultural relics to the maximum degree is urgently needed to be solved. According to the results of the present investigation, the stability of the adhesive in the adhesion effect can not be well guaranteed only by the manufacturing method of the teacher-apprentice-mouth-ear mutual transmission, and the scientific research of the adhesive needs to be further developed.
The requirements for adhesive fabrication include: the side effect of the adhesive on the paper is reduced to the minimum; the adhesive has reversible effect after being used, and does not affect the mounting re-stripping and repairing of the mounting in the future; the adhesive has moderate pasting property when in use, and both the stability and the viscosity of the adhesive can reach the condition which is most beneficial to the preservation of mounted parts; after the adhesive acts on the mounted part, the insect-proof and mildew-proof effects can be achieved in the preservation process.
Scientific research on the raw materials for making the adhesive for the paper cultural relics is carried out, the adhesive making process is explored, and a standardized raw material formula, a production process flow and a corresponding application effect evaluation standard are formed; the modified adhesive for the paper cultural relics is developed, the defects that the traditional adhesive is easy to hydrolyze and acidify, the preparation process is strong in randomness, the proportion and the performance are unstable and the like are overcome, and the comprehensive performance of the modified adhesive is comprehensively improved.
Disclosure of Invention
In view of the above problems in the prior art, an object of an aspect of the present invention is to provide a modified adhesive for paper cultural relics.
In order to achieve the purpose, the invention provides a modified adhesive for paper cultural relics, which comprises the following components in parts by weight:
90-99.5 parts of wheat starch
0.5 to 10 portions of modified additive
450 to 900 parts of water, and the like,
wherein the wheat starch contains 15-30% of amylose and 70-85% of amylopectin; the modifying additive is one or more of compounds capable of reacting with hydroxyl and/or carboxyl.
Preferably, the modifying additive is selected from one or more of ammonium salt compounds.
In some embodiments, the present invention provides a modified adhesive for paper relics, which comprises the following components in parts by weight:
90-99.5 parts of wheat starch
0.5 to 10 portions of modified additive
450 to 900 parts of water, and the like,
wherein the pH value of the adhesive is between 4 and 9; the viscosity of the adhesive is between 0.3 and 0.7m2Between/s; the modifying additive is one or more of compounds capable of reacting with hydroxyl and/or carboxyl.
Another object of the present invention is to provide a method for preparing a modified binder for paper cultural relics, which comprises the following steps:
mixing wheat starch and water according to a preset proportion to obtain a premixed product, stirring the premixed product at normal temperature, slowly heating to 90-95 ℃, preserving heat for a preset time, and naturally cooling;
adding a modifying additive into the premixed product after natural cooling, wherein the adding amount is 0.5-10% of the absolute dry weight of the starch, and uniformly stirring to obtain the adhesive.
Preferably, the stirring speed is 30 to 100rpm when the premixed product is stirred at normal temperature.
Preferably, the wheat starch is mixed with water in a ratio of 1: 5.
Preferably, the heat preservation treatment time is 30-40 min.
The modified adhesive for the paper cultural relics has the advantages of improved pH value, medium alkalinity, moderate viscosity, moderate stripping degree, certain mildew resistance and good hand feeling in actual use, and the coated paper has better performances in tensile strength, tearing strength, folding strength, aging strength, pH value, contact angle and aging performance. The method can be applied to works such as painting and calligraphy repairing and mounting, ancient book repairing, archive repairing and the like, and is particularly suitable for repairing and mounting cultural relic-level ancient painting and calligraphy and ancient book.
Compared with the prior art, the method has the advantages that,
it is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
This document provides an overview of various implementations or examples of the technology described in this disclosure, and is not a comprehensive disclosure of the full scope or all features of the disclosed technology.
Drawings
FIG. 1 is a graph of the viscosity measurements for each set of adhesives;
FIG. 2 is a line graph of tear strength for each group;
FIG. 3 is a graph of fold line resistance for each group.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be described below clearly and completely with reference to the accompanying drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.
Example 1: preparation process discussion of modified adhesive containing additives in different proportions and tests of pH value, viscosity, stripping degree, mildew resistance and actual application effect of adhesive
1. Experimental materials and instruments: wheat starch (white crane); ultrapure water; an additive; a rotary stirring heater (lesavcier); clean PH30 portable pH value tester; viscometers (RST rheometers); peel off scale (fully automatic tensile tester).
2. Preparation of modified Binders
Through reference of documents and interview, practice experiences of professionals engaged in paper cultural relic protection for years are known, meanwhile, multiple process tests are combined, the mass ratio of starch to ultrapure water is preliminarily determined to be 1:5, and the starch in the adhesive is completely gelatinized by heating in a rotary stirring heater for 30 min. Modified binders are prepared by adding additives such as ammonium carbonate to the binder in varying proportions and amounts. Of course, other ammonium salt additives may be mixed to practice the invention, such as ammonium bicarbonate, ammonium acetate, ammonium propionate, ammonium zirconium carbonate, and various quaternary ammonium salts, but preferably, ammonium salts having a pH of 7 or more in aqueous solution are contemplated. It should be noted that the present invention can be realized by mixing two or more additives, but the specific mixing ratio is not specifically limited in the present application, and those skilled in the art can make reasonable range adjustment according to the actual needs and the characteristics of different types of additives.
1) The preparation process of the pure starch adhesive comprises the following steps: 140g of starch and 700g of ultrapure water were stirred at normal temperature and sufficiently mixed according to a mass ratio of 1:5, the mixture was placed in a rotary stirring heater to be heated and gelatinized, the temperature was set to 5 steps and the setting time was 30min, the adhesive was observed while being heated and stirred, and finally, the mixture was thickened into a translucent paste, and 760g of the adhesive was prepared (water was volatilized 80g in the preparation process). And taking out and placing in a beaker, naturally cooling, and marking as a No. 1 adhesive.
2) The preparation process of the modified adhesive added with the additives in different proportions comprises the following steps: the pure starch adhesive is prepared by the steps of the method, and when the pure starch adhesive is naturally cooled to 30 ℃, the additive (the specific dosage is shown in the table 1) is added into the adhesive, and the dosage of the additive is calculated according to the percentage of the dry weight of the starch contained in the adhesive. Fully stirring, cooling to be tested, and respectively marking as No. 2, No. 3, No. 4, No. 5 and No. 6 adhesives.
TABLE 1 starch and additive content in the binders of each group
3. Determination of the pH of the Binder
Respectively taking No. 1-6 adhesives in a Clean beaker, adding 20g of the adhesives into 30g of ultrapure water according to the mass ratio of the adhesives to the water of 2:3, stirring to dilute the adhesives evenly, measuring the No. 1-6 diluted adhesives by using a Clean PH30 portable pH value measuring instrument, and the result is shown in Table 2 and shows that the pH value of the adhesives is continuously increased along with the increase of the content of the additives.
TABLE 2 Table of pH vs. time for each group of binders
4. Adhesive viscosity measurement
Respectively taking No. 1-6 adhesives by using a balance, adding the adhesives into a beaker, and adding a proper amount of ultrapure water so that the mass ratio of the adhesives to the ultrapure water is 3: 2, the corrected RST rheometer is used for viscosity measurement, and data are read. The results are shown in FIG. 1. Figure 1 shows that the adhesive viscosity decreases with time (machine shear rate increases with time) and the adhesive viscosity increases progressively from number 1 to 6 with increasing additive content. FIG. 1 is a graph of the viscosity measurements for each group of adhesives (where adhesive No. 1 is the curve with the lowest square wave peak and adhesive No. 6 is the curve with the highest square wave peak).
5. Adhesive peel test
And respectively adding ultrapure water into No. 1-6 adhesives, wherein the ratio of the adhesives to the ultrapure water is 3: 2, the mixture was stirred in a stirrer (MJ-BL 1206A). 6 strips of silk cloth with the length of 58cm and the width of 16cm are weighed, 29.00g of No. 1-6 adhesive which is placed for one day at room temperature is respectively weighed, scattered into uniform paste and uniformly brushed on the silk surface of the silk cloth after paper supporting. And folding the brushed silk cloth in half, keeping the left and right edges for 10cm (so as to carry out a peeling strength test), padding a piece of water-oil paper on the silk cloth, and brushing the silk cloth in an up-down and left-right manner for 2min by replacing a clean brush, so that the folded silk cloth does not generate bubbles and is uniformly adhered together. The silk cloth was weighed again to 20.5g, left at room temperature for 30min, and then a weight was placed on the silk cloth and pressed for 10min to allow sufficient contact between the upper and lower silk cloths and the adhesive. And standing at room temperature for 1h, cutting silk cloth strips with the length of 10cm and the width of 5cm after the silk cloth is dried completely, performing a peeling experiment by using a full-automatic tensile tester, and reading data. The results are shown in table 4 and show that as the additive content increases, the peel strength of the adhesive coated scrim strips increases with increasing pull-off distance.
TABLE 4 test for degree of adhesive peel for each group
6. Mildew resistance test for each group of adhesives
In order to examine the mildew resistance of the adhesives with different additive proportions in actual use, adhesives No. 1-6 are respectively placed in a culture dish and are statically observed for 20 days under the conditions of 25 ℃ of temperature and 60% of humidity, and the results show that: the adhesive No. 1 firstly generates mildew after standing for 10 days, so that the adhesive added with the additive can effectively inhibit the growth of the mildew in the adhesive within a certain period of time and delay the mildew of the adhesive. The mold-proofing effect of the binder increases with increasing additive content.
TABLE 5 mildew resistance test for various groups of adhesives
And (3) evaluating the actual application effect: and (4) selecting different paper cultural relic repair workers to evaluate the use effect of the No. 1-6 adhesive. According to personal feeling, the adhesive is graded, good hand feeling is achieved by +++, good hand feeling is achieved by ++, hand feeling is general, and hand feeling is poor. The evaluation results are shown in table 6, and the results show: binder # 1 was 75%, + 25%; binder # 2 was 25% and binder # 75%; binder # 3 was 25% and binder # 75%; binder No. 4 + + 50%, and binder + 50%; binder 5 + 37.5%, and + + 62.5%; binder No. 6 + was 50% and + was 50%. The paper cultural relic repair personnel think that the No. 2-4 adhesive has better hand feeling.
TABLE 6 evaluation chart of practical application effect
7. Discussion and summary
1) The pH of the binder increases with increasing additive content.
2) The viscosity of the adhesive is in direct proportion to the degree of peeling, and the higher the viscosity, the more difficult the peeling becomes, and the greater the peeling force is required.
3) The viscosity and the peel strength of the adhesive are improved along with the increase of the content of the additive, and the viscosity and the peel strength of the adhesive are moderate when the concentration of 0.5 to 2 percent is selected during the preparation of the adhesive.
4) Compared with the adhesive No. 1, the adhesive added with the additive has obvious mildew-proof effect, and the mildew-proof effect is improved along with the increase of the content of the additive.
5) Through the practical use evaluation of different repair workers, the practical use evaluation of No. 2, No. 3 and No. 4 three groups of adhesives is the highest, and the adhesive is most suitable for the repair of paper cultural relics.
Example 2: performance testing of modified adhesive-coated Xuan paper
1. Experimental materials and instruments: wheat starch (white crane); ultrapure water; additives (compounds capable of reacting with hydroxyl, carboxyl, etc.); four-foot cotton with rice paper (wang six ji brand); arranging brushes; paper folding resistance (MIT); horizontal Tensile Machines (TMI); tearability gauge (Tinius & Olsen); a dynamic contact angle Determinator (DAT); a pure water meter (Elix 3); portable pH meter (Clean pH 30); a portable colorimeter (HPG-2132); constant temperature and humidity test chamber (RMF-115).
2. Preparation of modified Binders
Samples No. 1 to 6 were obtained by the preparation method in example 1.
3. Preparation of coated Xuan paper sample
1) Binders nos. 1-6 were diluted to 50% concentration separately. Uniformly coating one side of four feet of cotton with rice paper with a row of pens, flattening on a table, drying the rice paper, and taking down, wherein the paper is marked as No. 1-6 paper pattern.
2) The No. 1-6 paper samples are put into a constant temperature and humidity test box, and according to GB/T22894-2008, under the conditions of 80 ℃ and 65% relative humidity and aging for 0, 3, 6, 12 and 24 days, a part of the paper samples are respectively taken out and marked as aged D0, D3, D6, D12 and D24 days.
4. Test and results of physical and chemical properties of paper pattern
1) And (3) testing the tensile strength: the tensile strength, namely the strength of the paper body, is measured by using a TMI horizontal tensile machine according to GB/T12914-2008.
TABLE 7 Cross grain tensile Strength (tension) (kN/m)
A transverse striation
TABLE 8 vertical grain tensile Strength (tensile) (kN/m)
B vertical stripe
Tables 7 and 8 show that the aging strength of the sample papers of the experimental groups 2-6 is better than that of the sample paper of the control group 1, and the adhesive added with the additive does not accelerate the degradation of the aging performance of the paper.
2) And (3) tearing strength test: the tear strength is a measure of the mechanical strength of paper and is tested using a Tinius & Olsen paper tear tester according to GB/T455-. The tearing strength of the test group No. 2-4 paper samples is slightly higher than that of the control group No. 1 paper samples, the tearing strength of the 5-6 groups is lower, the tearing strength trends of all the paper samples are close, and the tearing strength is reduced along with the increase of aging time, which shows that the adhesive added with the additive can not accelerate the reduction of the paper performance. Graph one tear line graph for each group
3) And (3) pH value test: the pH of the paper was measured according to TAPPI T529 OM-2004 using a CLEAN pH30 pH tester. The pH data of the test group No. 2-6 paper samples are alkaline after aging, and are higher than the control group No. 1 paper samples.
TABLE 9 pH before and after aging of the samples
4) And (3) testing the folding endurance: the folding endurance is a measure of the mechanical strength of the paper and is determined according to GB/T457-2008 using a TIM paper folding endurance detector. The folding aging resistance strength of the No. 2-4 paper patterns of the experimental group is higher than that of the No. 1 paper patterns of the control group, and the folding aging resistance strength of the No. 5 and No. 6 paper patterns is lower. The additive can increase the folding endurance of the paper within a certain concentration range, but has the effect of reducing the folding endurance of the paper when the specific gravity is higher than 2 percent of the weight of the dry powder. Folding-resistance line chart of each group of chart II
5) And (3) testing the color difference value: the color difference change was calculated using the CIE L a b color system according to the equation Δ E Δ L2+ Δ a2+ Δ b2, and measured using the HPG-2132 portable colorimeter, and each set of data was the average of 10 valid data. The results show that the color difference values before and after the ageing of the No. 2 to No. 6 paper patterns of the experimental group are close to those before and after the ageing of the No. 1 paper patterns of the control group. As aging time increases, the color difference curves of all groups are basically equal to those of a control group, and the color difference caused by the coating of the modified adhesive on the paper sample is slightly influenced.
TABLE 10 color difference Δ E before and after aging for each set of samples
| D0 | D3 | D6 | D12 | D24 | |
| No. 1 paper pattern | 2.3 | 3.0 | 3.2 | 4.2 | |
| No. 2 paper pattern | 1.6 | 3.1 | 3.0 | 4.4 | |
| No. 3 paper pattern | 2.4 | 3.8 | 4.1 | 5.1 | |
| No. 4 paper pattern | 2.2 | 3.6 | 3.7 | 4.2 | |
| No. 5 paper pattern | 1.4 | 3.3 | 3.4 | 6.2 | |
| No. 6 paper pattern | 1.3 | 3.2 | 3.5 | 5.1 |
6) And (3) contact angle detection: the contact angle is the tangent to the gas-liquid interface at the intersection of the gas, liquid and solid phases, the angle θ between the liquid side and the solid-liquid boundary being a measure of the degree of wetting. In this experiment, the water resistance of the paper sample was shown. The results show that the water resistance of the No. 2-6 paper samples of the experimental group is superior to that of the No. 1 paper sample of the control group. With the aging time increasing, the contact angle of the same sample is gradually increased, and the water resistance is improved.
TABLE 11 contact Angle values before and after aging treatment of the samples of each group
The dosage of the additive influences the physical strength of paper, such as tensile strength, folding strength and the like: the additive amount with the proportion of 2 percent higher than the dry powder weight reduces the physical strength of the paper and accelerates the aging of the paper; the proportion of additives in amounts of 0.5% to 2% by weight of the dry powder makes it possible to increase the physical strength of the coated paper. According to the experimental results of the aged tensile strength, the tearing strength, the pH value, the folding resistance, the color difference and the contact angle of the rice paper coated with the modified adhesive, the performances of the second group, the third group and the fourth group of samples are superior to those of other groups, and the proportion is that the weight of the additive is 0.5-2% of that of the dry powder.
5. Discussion and summary
1) The tensile strength tests show that the tensile strength of the paper sample coated with the No. 2-6 modified adhesive in the transverse grain direction and the vertical grain direction is superior to that of the paper sample of the control group No. 1, and the modified adhesive has an improvement effect on the tensile strength of the paper sample compared with the traditional adhesive.
2) The tearing strength, folding strength and aging strength of the paper sample coated with the No. 2-4 modified adhesive are higher than those of the No. 1 paper sample of the control group, and the tearing strength and folding strength and aging strength of the No. 5 and No. 6 paper samples are lower. The additive can increase the tearing strength and the folding strength of paper in a certain concentration range, but has the effect of reducing the tearing strength and the folding strength of the paper when the specific gravity is higher than 2 percent of the weight of dry powder.
3) The pH data for samples coated with the modified binders Nos. 2-6 were all alkaline after aging, higher than the control No. 1 sample.
4) The modified binder has little effect on the color difference of the paper pattern and can be used as a conventional binder.
5) The modified adhesive has the function of improving the water resistance of the paper pattern, and the water resistance is continuously improved along with the increase of the content of the additive.
By combining the pH value, viscosity, stripping degree, mildew resistance and actual operation evaluation, the modified adhesive No. 2-4 is considered to have good effect by the factors of paper tensile strength, tearing strength, folding strength and aging strength, paper pH value, color difference, contact angle and aging performance after coating.
Thus, in this example of the invention, the ingredients of the modified binder were determined to be:
90-99.5 parts of wheat starch, 0.5-2 parts of modified additive and 750 parts of water. During preparation, according to the mass ratio of 1:5, starch and ultrapure water are added into a rotary stirring heater to be heated and gelatinized, the temperature is set to 5 grades, the setting time is 30min, the adhesive is observed while heating and stirring are carried out, finally the adhesive becomes thick and semitransparent paste, the adhesive is taken out and placed into a beaker, and when the temperature is cooled to 30 ℃ at room temperature, the additive is added into the adhesive, and the modified adhesive is prepared by fully stirring.
The modified adhesive prepared according to the proportion has the advantages of improved pH value, medium alkalinity, moderate viscosity, moderate stripping degree, certain mildew resistance, good hand feeling in actual use, and better performances of tensile strength, tearing strength, folding strength, aging strength, pH value, contact angle and aging performance of coated paper.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.
Claims (6)
1. The modified adhesive for the paper cultural relics comprises the following components in parts by weight:
90-99.5 parts of wheat starch
0.5 to 10 portions of modified additive
450 to 900 parts of water, and the like,
wherein the wheat starch contains 15-30% of amylose and 70-85% of amylopectin; the modifying additive is selected from one or more of ammonium salt compounds.
2. The modified adhesive for the paper cultural relics comprises the following components in parts by weight:
90-99.5 parts of wheat starch
0.5 to 10 portions of modified additive
450 to 900 parts of water, and the like,
wherein the pH value of the adhesive is between 4 and 9; the viscosity of the adhesive is between 0.3 and 0.7m2Between/s; the modifying additive is selected from one or more of ammonium salt compounds.
3. A process for preparing a modified binder as claimed in claim 1 or 2, comprising:
mixing wheat starch and water according to a preset proportion to obtain a premixed product, stirring the premixed product at normal temperature, slowly heating to 90-95 ℃, preserving heat for a preset time, and naturally cooling;
adding a modifying additive into the premixed product after natural cooling, wherein the adding amount is 0.5-10% of the absolute dry weight of the starch, and uniformly stirring to obtain the adhesive.
4. The production process according to claim 3, wherein the premixed product is stirred at a normal temperature at a stirring speed of 30 to 100 rpm.
5. The method according to claim 4, wherein the wheat starch is mixed with water in a ratio of 1: 5.
6. The method according to claim 4, wherein the heat-retaining treatment is carried out for 30 to 40 min.
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| CN201811561584.4A CN109762488B (en) | 2018-12-20 | 2018-12-20 | Modified adhesive for paper cultural relics and preparation method thereof |
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| CN201811561584.4A CN109762488B (en) | 2018-12-20 | 2018-12-20 | Modified adhesive for paper cultural relics and preparation method thereof |
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| CN109762488A CN109762488A (en) | 2019-05-17 |
| CN109762488B true CN109762488B (en) | 2020-11-06 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0849342A1 (en) * | 1993-06-01 | 1998-06-24 | National Starch And Chemical Investment Holding Corporation | All natural, starch-based, water-resistant corrugating adhesive |
| MXPA04010012A (en) * | 2002-04-12 | 2004-12-13 | Remy Ind N V | Starch-based glue paste compositions. |
| CN101993671A (en) * | 2009-08-12 | 2011-03-30 | 刘力恒 | Method for preparing starch modified latex and adhesive |
| CN104893614A (en) * | 2015-05-21 | 2015-09-09 | 芜湖蒲草电子商务有限公司 | High-strength waterproof binder for corrugated paper case |
| CN107326730A (en) * | 2017-06-30 | 2017-11-07 | 常州思宇环保材料科技有限公司 | A kind of preparation method of modified starch base Cypres |
-
2018
- 2018-12-20 CN CN201811561584.4A patent/CN109762488B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0849342A1 (en) * | 1993-06-01 | 1998-06-24 | National Starch And Chemical Investment Holding Corporation | All natural, starch-based, water-resistant corrugating adhesive |
| MXPA04010012A (en) * | 2002-04-12 | 2004-12-13 | Remy Ind N V | Starch-based glue paste compositions. |
| CN101993671A (en) * | 2009-08-12 | 2011-03-30 | 刘力恒 | Method for preparing starch modified latex and adhesive |
| CN104893614A (en) * | 2015-05-21 | 2015-09-09 | 芜湖蒲草电子商务有限公司 | High-strength waterproof binder for corrugated paper case |
| CN107326730A (en) * | 2017-06-30 | 2017-11-07 | 常州思宇环保材料科技有限公司 | A kind of preparation method of modified starch base Cypres |
Non-Patent Citations (1)
| Title |
|---|
| "小麦胚乳中直链淀粉含量及糊化特性的研究初探";王晓曦等;《河南工业大学学报(自然科学版)》;20160430;第27卷(第2期);第17-20页 * |
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| CN109762488A (en) | 2019-05-17 |
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