CN109762488A - Paper relics modified adhesive and preparation method thereof - Google Patents

Abstract

The invention discloses a kind of paper relics modified adhesives, in parts by weight, comprising: 90-99.5 parts of wheaten starch, 0.5-10 parts of modified additive, 450-900 parts of water, wherein, amylose content is 15%-30%, amylopectin content 70%-85% in the wheaten starch；The modified additive is one of compound that can be reacted with hydroxyl and/or carboxyl or a variety of.Paper relics modified adhesive pH value of the invention has promotion, in neutral and alkali, modest viscosity, splitting is moderate, there is certain mould proof ability, it is preferable to actually use feel, and paper has relatively good performance in anti-tensile, tearability, folding strength and its aging intensity, pH value of paper, contact angle and its ageing properties after coating.

Description

Paper relics modified adhesive and preparation method thereof

Technical field

The present invention relates to a kind of adhesive compositions, more particularly to a kind of a kind of modified adhesive of paper relics. The invention further relates to the preparation methods for changing adhesive.

Background technique

Paper relics belong to organic historical relic, vulnerable to illumination, temperature and humidity, pernicious gas, damage by worms, rat eaten, the factors such as mould It influences, to generate disease.Conventional repair techniques can carry out effective protection to paper relics, the papery text by reparation, mounting Object can both remove some hidden danger diseases of itself, extend its vitality；Paper relics can also be made to become more secured, beautiful, Convenient for saving and showing.

China about paper relics reparation, mounting it is with a long history, according to the current earliest unearthed material object that can be seen From the point of view of, just occurred the painting on silk Jing Guo mounting before 1500, and in successive dynasties document all about paper relics reparation, The record of mounting.

Reparation and mounting are carried out to paper relics, needed by multinomial process procedure.Wherein, adhesive is as connection papery The bridge of historical relic ontology and various reparations, mounting material makes and is used in paper relics reparation in occupation of particularly significant Position, be in conventional repair techniques occur protection, repair effectiveness an important ring.How papery by repair after can just be made Historical relic becomes not only to bond moderate but also soft smooth, and can have both insect prevention, mould proof and other effects, be current paper relics restoration and protection material The key point and break-through point that material --- adhesive needs to solve.These targets are better achieved, it just must be from the original of adhesive Material is started with two aspect of preparation.

Ancients make it has long been recognized that a kind of influence of this adhesive-of paste to the paperys quality such as painting and calligraphy, ancient books There are the records of many summaries and the traditional paste manufacture craft of explaination in beneficial exploration and practice.Now enumerate following items.

The Tang Dynasty Zhang Yan is rolled up in third " opinion dress back mounting axis " far away from " famous paintings through the ages note " and is just emphasized: " it is all to boil paste, muscle must be removed, Dilute to delay to obtain institute, that stirs does not stop, and adjusts naturally ripe.It is remaining often to enter few carefully grind and smoke Lu Xiangmo, come from clumsy meaning, goes moth-eaten and secured, ancients forever Think of not."；

There is " controlling paste " and " with paste " in " the decoration will " of Ming Dynasty Zhou Jiazhou, wherein " controlling paste " chapter records: " first with flower Green pepper is stewed soup, and is filtered off green pepper, is let cool in Sheng Jing earthen basin, by fine flour by rotation gently crushed grain, is enabled its slow falling, can not be stirred.After a night, tomorrow morning It stirs evenly.It such as soaks a few days, per morning must stir once." in addition, its " with paste " records: " and table in paste, still ink in glue.Ink is with glue At table is to paste just.Glue is empty clearly with kind then ichor, and paste rolls up Shu Wenshi with good.Calling is preferably, and beautiful and ugly is formal to be relied.Skilled worker is with paste as used Clear water is only being brushed more."

" the surplus will " of Ming Dynasty Wen Zhenheng is rolled up also on the books in five " method pastes ": " method paste, is filled with water with earthen basin, with one jin of face infiltration It is waterborne, be allowed to drift along, Xia Wu, the winter ten days, with smelly for degree, after with clear water dip in the bletilla striata half two, alum three divides, go dregs and first leaching face It breaks into, with regard to the group of breaking into pot, it is ripe separately to change boiling, removes water, inclines and set a device, Hou Leng changes water logging, face and tune to open to soup day, avoids with dense Paste and worn-out broom." simultaneously, which also proposed mixes beeswax in paste, to achieve the effect that Mi Run, and is added and smokes Lu Xiangmo To reach the way of expelling parasite and reinforcing.

Qing Dynasty's FANG Yi-zhi is rolled up in eight " decoration methods " in its works " the small knowledge of physics " and is described at that time according to Various Seasonal thick In paste add drug method, in which: " spring with gleditsia sinensis one very, talcum, alum, pericarpium zanthoxyli, yellow wax oil it is each one liang；Summer grade wax, alum, It ends each one liang, vermiculite, semen momordicae, gentianae macrophyllae, the bletilla striata, grassland spend fifty-fifty two, and crotons are a little, gleditsia sinensis one is endured；Autumn adds stone swallow a little；Winter With one liang of yellow wax, five money of alum, two money of sal ammoniac, two liang of Poria cocos, three money of salt, one jin of face."

To modern age, due to the difference of weather, repair, the difference of mounting school, paper relics repair mounting adhesive Raw material and preparation method also there is larger difference.South, the paper relics reparation in the north, mounting process are where in order to adapt to The climatic environment in region has gradually formed the adhesive preparation method to differ from one another.And when making adhesive, in order to reinforce gluing The bonding effect of mixture, and enhance its mould proof, insect prevention effectiveness, also occur increasing alum, the bletilla striata, river in adhesive The way of some insect prevention drugs such as green pepper, glycerol or substance.

Now, with the development of society, many traditional technologies are not passed on well, paper relics reparation, dress Very big discrepancy, documented paste production formula in Ancient books have been formulated documented by mounting adhesive and ancient books Also actual meaning has been lost, has not obtained application well and practice.

Currently, the production of China's traditionally on paper historical relic adhesive primarily forms from the point of view of according to the result investigated on the spot Two group of north and south, south send (Soviet Union's mounting) mainly based on flour, and north sends (capital mounting) mainly based on starch.And at this to make raw material not In the factions being divided into together, and spreads out stretch out two kinds of production methods of punching method and decoction method respectively.It is wherein identical to be, the two groups Tying up in the manufacturing process of adhesive generally can all be added alum as additive, at present it is not yet found that other are alternative bright The material of alum.

Alum (also known as alum, alum), inorganic compound, the aqueous double salt of potassium sulfate and aluminum sulfate, colorless and transparent knot Crystalline substance is product made of Sulfates mineral alunite is refined by processing, primary aqueous aluminum aluminum sulfate (KAl (SO₄)₂· 12H₂O), aqueous solution has astringent taste, commonly used to make clarification of water.Its advantage in paper relics make of adhesive is can to increase Add the viscosity of adhesive, and can prevent adhesive from going bad because of fermentation；The disadvantage is that alum facile hydrolysis generates acidic materials, can reduce PH value and the degree of polymerization of paper of adhesive etc., to influence the durability of the mounting materials such as paper and thin silk fabric thin,tough silk, these are all unfavorable In the long-term preservation of paper relics.

It in mounting repair process, due to not paying attention to the scientifical use of adhesive, makes by rule of thumb entirely, when handing-down It mostly teaches orally, there is no relatively scientific materials standards and specific raw material proportioning, largely result in papery text Object mounting effect is irregular, the different situation of mounting quality.And these hidden danger in short time after the completion of reparation and are not easy The problem of exposure, living through the very long time wears down, adhesive improper use just gradually appears: the formula of adhesive is not smart to be caused The poor quality of adhesive, so that the diseases such as curling, fracture occur for paper relics；The improper use of additive cannot not only be played The effect of mould proof, anti-calabash shell serving as a dipper accelerates the mildew speed of paper relics instead, can also aggravate its degree of aging；In addition, paper relics The limitation having in the form of succession with the traditional manufacturing technique of adhesive, but also the production formula of adhesive and production work There is different degrees of loss in skill.From the point of view of the paper relics of current collection, all there is such problems in many paper relics, this Have led to the situation that a large amount of paper relics are faced with " self-destruction ", it would be highly desirable to repair.

In order to which the permanent preservation of paper relics is better achieved, the use of adhesive is just particularly important, how maximum Degree, which plays favorable factor of the adhesive in paper relics reparation, mounting, all becomes urgent problem.According to current From the point of view of the result of investigation, only it can not guarantee that adhesive plays bonding effect well by the production method that master and apprentice teaches orally The scientific research of stability, adhesive needs to be further spread out.

Adhesive production requires to include: adhesive is preferably minimized the side effect of paper；Adhesive has after use Reversible effect, do not influence mount part in the future take off mounting and reparation again；It is moderate that adhesive wants to reach when in use paste property, steady The qualitative and sticky equal condition that can reach most useful for mounting part preservation；After adhesive acts on mounting part, it can be played during preservation anti- Worm, mould proof effect.

The scientific research that paper relics make raw material of adhesive is carried out, adhesive manufacture craft is explored, forms specification The formula for raw stock of change and the technological process of production and corresponding application effect evaluating regulation；Paper relics are developed with modified bonding The drawbacks such as agent overcomes conventional adhesive facile hydrolysis, acidification, and the random strong, proportion of preparation process and performance are unstable, make its synthesis Performance is able to General Promotion.

Summary of the invention

In view of the above problem of the existing technology, an aspect of of the present present invention purpose is to provide a kind of paper relics modification Adhesive.

In order to realize the purpose, paper relics modified adhesive provided by the invention, in parts by weight, comprising:

90 parts -99.5 parts of wheaten starch

0.5 part -10 parts of modified additive

450 parts -900 parts of water,

Wherein, amylose content is 15%-30%, amylopectin content 70%-85% in the wheaten starch； The modified additive is one of compound that can be reacted with hydroxyl and/carboxyl or a variety of.

Preferably, the modified additive is selected from one of ammonium salt compound or a variety of.

In some embodiments, paper relics modified adhesive provided by the invention, in parts by weight, comprising:

90 parts -99.5 parts of wheaten starch

0.5 part -10 parts of modified additive

450 parts -900 parts of water,

Wherein, the pH value of the adhesive is between 4-9；The viscosity of the adhesive is between 0.3-0.7m²Between/s；Institute Stating modified additive is one of compound that can be reacted with hydroxyl and/carboxyl or a variety of.

It is another object of the present invention to provide a kind of preparation method of paper relics modified adhesive, this method packets It includes:

Wheaten starch is carried out to mix to obtain premix product according to preset ratio with water, stirs the premix product under room temperature, and After be to slowly warm up to 90-95 DEG C, natural cooling after isothermal holding preset time；

Increase modified additive in premix product after natural cooling, additive amount is the 0.5%- of starch oven-dry weight 10%, it stirs evenly up to adhesive.

Preferably, when stirring premixes product at normal temperature, mixing speed 30-100rpm.

Preferably, the ratio that wheaten starch and water are mixed is 1:5.

Preferably, the time of isothermal holding is heat preservation 30-40min.

Paper relics modified adhesive pH value of the invention has promotion, is in neutral and alkali, and modest viscosity, splitting is moderate, Have certain mould proof ability, actual use feel is preferable, and after being coated with paper in anti-tensile, tearability, folding strength and its aging Intensity, pH value of paper, contact angle and its ageing properties have relatively good performance.It can be applied to Restoration of painting and calligraphy mounting, ancient books It in the work such as reparation, archives reparation, is drawn especially suitable for historical relic grade ancient book, the reparation mounting of ancient books.

Compared with prior art,

It should be appreciated that foregoing general description and it is described in detail below be merely exemplary with it is illustrative, rather than use In the limitation disclosure.

Present specification provides the various realizations or exemplary general introduction of technology described in the disclosure, is not disclosed skill The comprehensive disclosure of the full scope of art or all features.

Detailed description of the invention

Fig. 1 is each group adhesive viscosities measurement chart；

Fig. 2 is each group tearability line chart；

Fig. 3 each group folding strength line chart.

Specific embodiment

In order to enable the purposes, technical schemes and advantages of the embodiment of the present disclosure are clearer, below in conjunction with disclosure reality The technical solution of the embodiment of the present disclosure is clearly and completely described in the attached drawing for applying example.Obviously, described embodiment is A part of this disclosure embodiment, instead of all the embodiments.Based on described embodiment of the disclosure, this field is common Technical staff's every other embodiment obtained under the premise of being not necessarily to creative work, belongs to the model of disclosure protection It encloses.

Embodiment 1: the Study on The Preparation and adhesive pH value of the modified adhesive containing different ratio additive glue Degree and splitting, mould proof, practical application effect test

1, experimental material and instrument: wheaten starch (white crane board)；Ultrapure water；Additive；Stirring heater (le savcier)；The portable pH value analyzer of Clean PH30；Viscosity apparatus (RST rheometer)；Splitting instrument (full-automatic tensile tests Instrument).

2, the preparation of modified adhesive

By Literature Consult, investigation interview, the practical experience for being engaged in the professional of paper relics protection many years is understood, together When combine multiple engineer testing, primarily determine that the mass ratio of starch and ultrapure water is 1:5, system heated in Stirring heater Standby 30min, is gelatinized the starch in adhesive completely.Additive (such as the carbonic acid of different proportion dosage is added in adhesive Ammonium) it is prepared into modified adhesive.Certainly, other ammonium additive salts, which mix, also may be implemented the present invention, such as ammonium hydrogen carbonate, Ammonium acetate, propionic acid ammonium, zirconium carbonate ammonium and all kinds of quaternary ammonium salts etc., but preferably, it may be considered that using the ammonium of aqueous solution pH >=7 Salt.In addition it is worth noting that, two kinds or more of additive mixing can also realize the present invention, but for specific mixed proportion It is not specifically limited in this application, those skilled in the art with different types of additive characteristic, can do according to actual needs Zone of reasonableness adjustment.

1) preparation process of pure amylum adhesive: according to mass ratio 1:5, at normal temperature by 140g starch and 700g ultrapure water Stirring, is sufficiently mixed, and Heat Gelatinization in Stirring heater is put into, and is arranged 5 grades of temperature, time 30min is arranged, on one side Heating stirring observes adhesive on one side, and final retrogradation is translucent paste, and adhesive 760g (moisture evaporation in manufacturing process is made 80g).Taking-up is placed in a beaker, natural cooling, is labeled as No. 1 adhesive.

2) preparation process of the modified adhesive of different proportion additive is added: pure starch is made using above method step When naturally cooling to 30 DEG C, additive (specific dosage is shown in Table 1) is added in adhesive in adhesive, and additive amount is according to viscous The percentage of starch contained therein dry weight calculates in mixture.It is sufficiently stirred, cooling is to be measured, is respectively labeled as 2,3,4,5, No. 6 adhesives.

Starch and additive level in 1. each group adhesive of table

3, adhesive pH value measures

Take 1-6 adhesive in clean beaker respectively, according to adhesive and water quality than gluing 20g for the ratio of 2:3 Mixture is added in 30g ultrapure water, and stirring makes its dilution uniformly, measures 1-6 using the portable pH value analyzer of Clean PH30 Number dilution adhesive, the results are shown in Table 2, the results show that the pH value of adhesive is also constantly rising with the increase of additive level It is high.

2. each group adhesive pH value of table changes over time table

4, adhesive viscosities measure

Using balance, 1-6 adhesive is taken to be added in beaker respectively, adds suitable ultrapure water, make adhesive with The mass ratio of ultrapure water is 3:2, carries out viscosimetric analysis with the RST rheometer corrected, reads data.As a result as shown in Figure 1. Fig. 1 shows that adhesive viscosities decline (machine shear rate improves at any time) with the time, and adhesive viscosities are from 1 to No. 6 It is gradually increased with the increase of additive level.(wherein No. 1 adhesive is most lower to Fig. 1 each group adhesive viscosities measurement chart The smallest curve in square wave peak；No. 6 adhesives are the highest curve of wave crest).

5, adhesive splitting is tested

It takes 1-6 adhesive to be separately added into ultrapure water, makes the ratio 3:2 of adhesive and ultrapure water, in blender (MJ- BL1206A it is stirred in).Silk 6 of long 58cm wide 16cm are weighed, 29.00g is weighed respectively and places at room temperature one day 1-6 adhesive, is dispersed as homogeneous paste, and uniformly brush is after tray paper on the thin,tough silk face of silk.The silk doubling that will be brushed, left and right are each Side 10cm (to do peel strength test) is stayed, a water oilpaper is padded on silk, a clean brush is changed and arranges up and down Brush 2min uniformly sticks together so that bubble does not occur in the silk of doubling.Weighing silk again is 20.5g, is placed at room temperature Then weight is placed on silk and presses 10min by 30min, so that coming into full contact between silk and adhesive up and down.It is placed at room temperature for 1h cuts growth 10cm after silk parches, and the silk item of wide 5cm carries out peel test using full-automatic tensile test instrument, Read data.It the results are shown in Table 4, the results show that as additive level increases, be coated with the silk item of adhesive with spacing out Increase peel strength improve.

The test of 4. each group adhesive splitting of table

6, each group adhesive fungus-proof test

In order to investigate the mildew resistance of the adhesive of different additive proportion in actual use, 1-6 adhesive is distinguished It is placed in culture dish, observation 20 days is stood under conditions of 25 DEG C of temperature, humidity 60%, the results showed that No. 1 adhesive stands 10 Occur mildew after it first, it can be seen that, add the adhesive of additive that can effectively inhibit mould in adhesive within a certain period of time The growth of bacterium, delays adhesive to go mouldy.The anti-mold effect of adhesive is improved with the increase of additive level.

The test of 5. each group adhesive anti-mold effect of table

Practical application effect evaluation: select different paper relics repair personnel to 1-6 adhesive using effect into Row evaluation.It is adhesive marking according to personal feeling, feel is handy +++, feel is more handy ++, feel generally uses+, feel is bad With-.Evaluation result is as shown in table 6, as the result is shown: No. 1 adhesive ++ 75% is accounted for ,+account for 25%；No. 2 adhesives ++ 25% is accounted for, +++ account for 75%；No. 3 adhesives ++ 25% is accounted for, +++ account for 75%；No. 4 adhesives ++ 50% is accounted for, +++ account for 50%；No. 5 adhesives+ 37.5% is accounted for, ++ account for 62.5%；No. 6 adhesives+account for 50%, ++ account for 50%.Paper relics repair personnel and think 2-No. 4 bondings Agent feel is preferable.

6 practical application effect evaluation table of table

7, discussion and brief summary

1) pH value of adhesive is continuously improved with the increase of additive level.

2) proportional relation is presented in adhesive viscosities and splitting, and the viscosity the high to be just more difficult to remove, and required peeling force is just It is bigger.

3) adhesive viscosities and peel strength are improved with the increase of additive level, are selected when preparing adhesive The viscosity of adhesive and splitting are relatively mild when 0.5%~2% concentration.

4) compared to No. 1 adhesive of the adhesive of additive has been added to have apparent anti-mold effect, anti-mold effect is with addition The increase of the content of agent and improve.

5) it is actually used and is evaluated by different repair personnel, 2,3, No. 4 three groups of adhesives actual use evaluation highests, Paper relics reparation is most suitable for use.

Embodiment 2: modified adhesive is coated with paper performance test

1, experimental material and instrument: wheaten starch (white crane board)；Ultrapure water；Additive (can be anti-with the groups such as hydroxyl, carboxyl The compound answered)；Four ruler cotton of cotton material connects rice paper (Wang Liuji board)；Row brush；Paper folding strength instrument (MIT)；Horizontal puller system (TMI)；Tearability instrument (Tinius&Olsen)；Dynamic contact angle analyzer (DAT)；Pure water meter (Elix3)；Portable pH value is surveyed Determine instrument (Clean PH30)；Portable colorimeter (HPG-2132)；Constant temperature humidity chamber (RMF-115).

2, the preparation of modified adhesive

Using the preparation method in embodiment 1, sample 1-6 adhesive is obtained.

3, it is coated with the preparation of rice paper sample

1) 1-6 adhesive is diluted to 50% concentration respectively.Four ruler cotton Lian Xuan of cotton material is spread evenly across with spread pen respectively In the one side of paper, collapses and put down in desktop, removed after rice paper is dry, be labeled as 1-6 pattern.

2) 1-6 pattern is put into constant temperature humidity chamber, according to GB/T 22894-2008, in 80 DEG C, 65% phase To under damp condition, at aging 0,3,6,12,24 day, a part of pattern is respectively taken out, is labeled as aging D0, D3, D6, D12, D24 days.

4, the physicochemical property test and result of pattern

1) tensile strength is tested: tensile strength, that is, paper bulk intensity, and according to GB/T 12914-2008, tensile strength is real It tests and is measured using the horizontal puller system of TMI.

7 band tensile strength (pulling force) (kN/m) of table

A band

8 vertical line tensile strength (pulling force) (kN/m) of table

B vertical line

Table 7 and table 8 show, tested from band and vertical line both direction the result is that experimental group 2-6 pattern aging intensity It is superior to No. 1 pattern of control group, and the adhesive for being added to additive does not accelerate paper aging performance to decline.

2) tearability is tested: tearability is a kind of measurement of mechanical strength of paper, according to GB/T 455-2002, tearing Degree experiment is tested using Tinius&Olsen paper tear degree detector.The slightly higher control group 1 of experimental group 2-4 pattern tearability Number pattern, 5-6 group tearability is lower, and the tearability trend of whole patterns is close, and with the increase of ageing time, tearability is reduced, Show that the adhesive for being added to additive will not accelerate paper performance to decline.Fig. 1 each group tearability line chart

3) pH value is tested: according to TAPPIT529OM-2004, using CLEAN pH30 alkalinity acidity tester measurement paper PH value.The pH data of experimental group 2-6 pattern after weathering, in alkalinity, are higher than No. 1 pattern of control group.

The sample aging pH value before and after the processing of table 9

4) folding strength is tested: folding strength is a kind of measurement of mechanical strength of paper, according to GB/T 457-2008, is used TIM paper folding strength detector measures paper folding strength.Experimental group 2-4 pattern folding strength aging intensity is higher than control group 1 Pattern, 5, No. 6 pattern folding strength aging intensities are lower.Illustrate that the folding of paper can be increased in a certain concentration range inner additive Degree, but specific gravity is higher than 2% dry powder weight, plays the role of reducing paper folding strength.Fig. 2 each group folding strength line chart

5) value of chromatism is tested: chromatic aberration uses CIE L*a*b* colour system, according to equation Δ E=Δ L2+ Δ a2+ Δ b2 calculates color difference, is measured using HPG-2132 portable colorimeter, and every group of data are the average value of 10 valid data.As a result Show to approach before and after the aging of experimental group 2-6 pattern with value of chromatism before and after No. 1 pattern aging of control group.Increase with ageing time, Each group chromatic curve maintains an equal level with control group substantially, and modified adhesive coating influences very little to color difference caused by pattern.

The sample aging front and back color difference △ E value of 10 each group of table

	D0	D3	D6	D12	D24
						No. 1 pattern		2.3	3.0	3.2	4.2
No. 2 patterns		1.6	3.1	3.0	4.4
						No. 3 patterns		2.4	3.8	4.1	5.1
No. 4 patterns		2.2	3.6	3.7	4.2
						No. 5 patterns		1.4	3.3	3.4	6.2
No. 6 patterns		1.3	3.2	3.5	5.1

6) contact angle detection: contact angle refers to the tangent line of the liquid-vapor interface made by gas, liquid, solid three-phase point of intersection, this cuts Line is the measurement of wetness degree in the angle theta between solid-liquid boundary line of one side of liquid.In this experiment, for indicating paper Open the water repelling property height of sample.The result shows that the water repelling property of experimental group 2-6 pattern is superior to No. 1 pattern of control group. Increase with ageing time, the contact angle of same sample is also gradually increased, and water-resistance improves.

The sample aging contact angle values before and after the processing of 11 each group of table

Additive amount influences the physical strengths such as tensile strength, the folding strength of paper: dosage is higher than 2% ratio of dry powder weight Additive amount, will reduce the physical strength of paper, accelerate paper aging；Dosage adds between dry powder weight 0.5%-2%'s Add agent ratio that can increase the physical strength of coating paper.Comprehensively modifying adhesive is coated with the aging tensile strength of rice paper, tearing Degree, pH value, folding strength, color difference and contact angle experiments as a result, second and third, four groups of sample properties be superior to other groups, ratio It is the 0.5%-2% of dry powder weight for weight of additive.

5, discussion and brief summary

1) it is tested by tensile strength, is coated with anti-tensile in the pattern band and vertical line both direction of 2-6 modified adhesive Intensity is superior to No. 1 pattern of control group, and modified adhesive has improvement effect compared to tensile strength of the conventional adhesive to pattern.

2) pattern tearability, folding strength and its aging intensity for being coated with 2-4 modified adhesive are higher than No. 1 paper of control group Sample, 5, No. 6 pattern tearabilities, folding strength aging intensities are lower.Illustrate that paper can be increased in a certain concentration range inner additive Tearability, folding strength, but specific gravity be higher than 2% dry powder weight, play the role of reduce paper tear degree, folding strength.

3) the pH data for being coated with the pattern of 2-6 modified adhesive after weathering, in alkalinity, are higher than No. 1 paper of control group Sample.

4) influence very little of the modified adhesive to pattern color difference, can use as traditional binders.

5) modified adhesive is improved the effect of pattern water repelling property, and with the raising of additive level, water-resistance It can constantly be promoted.

In summary pH value, viscosity, splitting, fungicidal properties, practical operation evaluation, paper anti-tensile after coating, tearability, Folding strength and its aging intensity, pH value of paper, color difference, contact angle and its each factor of ageing properties, it is believed that No. 2-4 modification is viscous Mixture has good effect.

Therefore, the ingredient of modified adhesive is determined in this embodiment of the invention are as follows:

90-99.5 parts of wheaten starch, 0.5-2 parts of modified additive, 450-750 parts of water.According to the ratio of quality 1:5 when production Starch and ultrapure water are added to Heat Gelatinization in Stirring heater, are arranged 5 grades of temperature by example, are arranged time 30min, and one Side heating stirring observes adhesive on one side, and final retrogradation is translucent paste, and taking-up is placed into beaker, is cooled at room temperature At 30 DEG C, additive is added in adhesive, obtained modified adhesive is sufficiently stirred.

Manufactured modified adhesive pH value has promotion according to the above ratio, is in neutral and alkali, and modest viscosity, splitting is moderate, Have certain mould proof ability, actual use feel is preferable, and after being coated with paper in anti-tensile, tearability, folding strength and its aging Intensity, pH value of paper, contact angle and its ageing properties have relatively good performance.

Above embodiments are only exemplary embodiment of the present invention, are not used in the limitation present invention, protection scope of the present invention It is defined by the claims.Those skilled in the art can within the spirit and scope of the present invention make respectively the present invention Kind modification or equivalent replacement, this modification or equivalent replacement also should be regarded as being within the scope of the present invention.

Claims (7)

1. paper relics modified adhesive, in parts by weight, comprising:

90 parts -99.5 parts of wheaten starch

0.5 part -10 parts of modified additive

450 parts -900 parts of water,

Wherein, amylose content is 15%-30%, amylopectin content 70%-85% in the wheaten starch；It is described to change Property additive is one of compound that can be reacted with hydroxy or carboxy or a variety of.

2. paper relics modified adhesive, in parts by weight, comprising:

90 parts -99.5 parts of wheaten starch

0.5 part -10 parts of modified additive

450 parts -900 parts of water,

Wherein, the pH value of the adhesive is between 4-9；The viscosity of the adhesive is between 0.3-0.7m²Between/s；The modification Additive is one of compound that can be reacted with hydroxyl and/or carboxyl or a variety of.

3. paper relics modified adhesive as claimed in claim 1 or 2, the modified additive is in ammonium salt compound It is one or more.

4. the preparation method of the modified adhesive of any one of claims 1 to 3, comprising:

Wheaten starch is carried out to mix to obtain premix product according to preset ratio with water, the premix product is stirred under room temperature, then delays Slowly it is warming up to 90-95 DEG C, natural cooling after isothermal holding preset time；

Increase modified additive in premix product after natural cooling, additive amount is the 0.5%-10% of starch oven-dry weight, is stirred It mixes uniformly up to adhesive.

5. preparation method as claimed in claim 4, at normal temperature when stirring premix product, mixing speed 30-100rpm.

6. the ratio that preparation method as claimed in claim 4, wheaten starch and water are mixed is 1:5.

7. preparation method as claimed in claim 4, the time of isothermal holding is heat preservation 30-40min.