CN105237648B - A kind of glyoxal cross-linked polymer is modified high amylopectin starch and its preparation method and application - Google Patents
A kind of glyoxal cross-linked polymer is modified high amylopectin starch and its preparation method and application Download PDFInfo
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Abstract
High amylopectin starch is modified the invention discloses a kind of glyoxal cross-linked polymer, the polymer that the polymer that non-ionic monomer prepolymerization including high amylopectin starch and for forming macromolecule carbon skeleton is formed and the cationic monomer prepolymerization for introducing positive electricity are formed, and the polymer that the high amylopectin starch, the polymer of non-ionic monomer prepolymerization formation and the cationic monomer prepolymerization are formed passes through the modification high amylopectin starch that glyoxal carries out cross-linking reaction formation block copolymerization；The non-ionic monomer is selected from acrylamide, N, N DMAAs, N, N acrylamides, N vinyl formamides, acrylonitrile etc.；The cationic monomer is selected from dimethyl diallyl ammonium chloride, the methyl chloride of dimethylamino ethyl acrylate and acrylic acid Of or benzyl chloride quaternary ammonium salt etc..The application that high amylopectin starch is added to wet end of machine as paper making additive is modified present invention also offers glyoxal cross-linked polymer.
Description
Technical field
High amylopectin starch and its preparation method and application is modified the present invention relates to a kind of glyoxal cross-linked polymer, belongs to poly-
Polymer modified industrial additive and its preparation and application technical field.
Background technology
In China's paper industry raw material, due to timber resource shortage, all kinds of reclaim papers are largely used at present as papermaking
Raw material.These raw materials cause fiber short due to the increase of recovered frequency, have a strong impact on intensity that paper and cardboard is made, it is necessary to
Drying strengthening agent is added in paper making process to be added to the intensity index of paper.In the drying strengthening agent used at present, modified starch series
Drying strengthening agent almost occupies the market share of the overwhelming majority.Such as Chinese patent CN102121207A, CN102603977A,
All kinds of modified starches described in CN103015263A and CN103590284A.But the modified starch series drying strengthening agent of prior art,
It there is cost high, limited to improving folding strength, ring crush intensity, pop strength equal strength index.And paper machine system is big for a long time
Amount uses starch as reinforcing agent, due to retention bottom, and the pollution to the plain boiled water of paper machine is larger and causes white water system to be stranded
It is difficult.Another of the drying strengthening agent of the modified starch series of prior art has the disadvantage while the dry strength of paper is increased due to wet
The dehydration rate reduction of paper web is caused to paper machine operation, the especially influence to large high-speed paper machine speed.
The content of the invention
The present invention is exactly formed sediment in view of the deficienciess of the prior art, providing a kind of glyoxal cross-linked polymer and being modified high side chain
Powder and preparation method thereof, it is added to wet end of machine to realize following purpose as paper making additive：Improve the dry strong of Paper or cardboard
Degree, bursting strength and folding strength；The dehydration rate of wet end is improved effectively to ensure paper machine operation speed；Initial journey is improved to retain
Rate lowers net hole white water consistency to reach.
To solve the above problems, the technical solution used in the present invention is as follows：
A kind of glyoxal cross-linked polymer is provided and is modified high amylopectin starch, including high amylopectin starch and for forming macromolecule
Polymer and formed for the cationic monomer prepolymerization for introducing positive electricity that the non-ionic monomer prepolymerization of carbon skeleton is formed
Polymer, and the high amylopectin starch, the non-ionic monomer prepolymerization formed polymer and the cationic monomer it is pre-
It polymerize the modification high amylopectin starch that the polymer formed carries out cross-linking reaction formation block copolymerization by glyoxal；
The non-ionic monomer is selected from acrylamide, N, and N- DMAAs, N, N- acrylamides, N- are different
One or more in propylacrylamide, N- vinyl formamides, acrylonitrile；
One or more of the cationic monomer in quaternary ammonium acrylate and methacrylic acid ester quat.Institute
State quaternary ammonium acrylate and methacrylic acid ester quat include but is not limited to be：Dimethylamino ethyl acrylate methyl chloride
Ammonium salt, dimethylamino ethyl acrylate methylsulfuric acid ammonium salt, dimethylaminoethyl acrylic acid benzyl chloride ammonium salt, dimethylamino second
Base acrylate sulfate, dimethyl amino ethyl acrylate hydrochloride, dimethylaminoethyl methacrylate methyl chloride
Ammonium salt, dimethylaminoethyl methyl methacrylate ammonium sulfate, dimethylaminoethyl methacrylic acid benzyl chloride ammonium salt, diformazan
Amidoethyl methacrylate sulfate, dimethylaminoethyl methacrylic acid ester hydrochloride, dimethylamino acrylamide first
Base ammonium sulfate, dimethylamino acrylamide hydrochloride, Methacrylamide ammonium chlorine etc..
Particularly preferably, the non-ionic monomer is selected from acrylamide, N,N-DMAA, N, N- diethyl third
One or more in acrylamide, N- vinyl formamides；The cationic monomer is selected from dimethyl diallyl ammonium chloride, third
The methyl chloride quaternary ammonium salt of olefin(e) acid dimethylamino ethyl ester, the methyl chloride quaternary ammonium salt of Dimethylaminoethyl Methacrylate, acrylic acid two
The methyl chloride quaternary ammonium salt of ethylamino- ethyl ester, the methyl chloride quaternary ammonium salt of diethylaminoethyl base ethyl ester, dimethylamino-propyl third
Methyl chloride quaternary ammonium salt, the methyl chloride quaternary ammonium salt of dimethylamino-propyl Methacrylamide, the acrylic acid dimethylamino second of acrylamide
The benzyl chloride quaternary ammonium salt of ester, the benzyl chloride quaternary ammonium salt of Dimethylaminoethyl Methacrylate, the benzyl of acrylic acid Of
Base chlorine quaternary ammonium salt, the benzyl chloride quaternary ammonium salt of diethylaminoethyl base ethyl ester, the benzyl chloride of dimethylamino propyl acrylamide
One or more in quaternary ammonium salt, the benzyl chloride quaternary ammonium salt of dimethylamino-propyl Methacrylamide.
Particularly preferably, the polymer molecular weight that the non-ionic monomer prepolymerization is formed is 1000~50000 dalton,
The polymer molecular weight that the cationic monomer prepolymerization is formed is 1000~50000 dalton, the modified high amylopectin starch
Molecular weight be 50 ten thousand to 500 ten thousand dalton.
It is including following invention also provides the preparation method that above-mentioned glyoxal cross-linked polymer is modified high amylopectin starch
Step：
Step 1: being in mass ratio by high amylopectin starch and soft water（1~20）︰ 100 ratio mixing, it is warming up to 100~
Stirring and dissolving at 160 DEG C, after high amylopectin starch is completely dissolved, cools to less than 60 DEG C；
Step 2: into the solution of step one, polymer, the cationic monomer for adding non-ionic monomer prepolymerization formation are pre-
It polymerize homopolymer, glyoxal and the pH buffer formed；In weak basic condition, cross-linking reaction is carried out below 40 DEG C of temperature,
In course of reaction, cross-linking reaction speed is controlled in the range of 7.5~9.5 with caustic-soda aqueous solution and dilute sulfuric acid the regulation pH value of dilution
Degree；
The pH buffer is selected from sulfuric acid, hydrochloric acid, phosphoric acid, acetic acid, sodium hydroxide, potassium hydroxide, strong acid weak base salt, highly basic
One or more in salt of weak acid；Specifically, the consumption of the pH buffer is determined according to actual needs, makes reactant mixture molten
The pH value of liquid is adjusted between 7.5~9.5.
Step 3: viscosity at viscosimetric, 25 DEG C is constantly sampled in the course of reaction of step 2 reaches 100~1000
After mPas, add sulphur acid for adjusting pH value stops below 3.0 reaction, then plus soft water adjustment solid content to 10wt%~
20wt%, is eventually adding antiseptic and produces described glyoxal cross-linked polymer modification high amylopectin starch；
The antiseptic is selected from anilid class, imidazoles, thiazoles, isothiazolone derivative, quaternary ammonium salt, double croaks
One or more in class, phenols；The consumption of antiseptic is that glyoxal cross-linked polymer is modified high amylopectin starch total product weight
0.01%~1%.
High amylopectin starch is modified as the application of paper making intensifier present invention also offers the glyoxal cross-linked polymer.
Specifically, the glyoxal cross-linked polymer is modified high amylopectin starch and included as the application process of paper making intensifier
Following steps：Raw material discongested, be beaten after, add the aqueous solution that the glyoxal cross-linked polymer is modified high amylopectin starch,
The consumption that the glyoxal cross-linked polymer is modified high amylopectin starch is the 0.2%~0.8% of oven dry stock quality, after being sufficiently stirred for i.e.
Can be manufactured paper with pulp Paper or cardboard.
Specifically, the glyoxal cross-linked polymer is modified high amylopectin starch and included as the application process of paper making intensifier
Following steps：Raw material discongested, be beaten after manufacture paper with pulp into cardboard, the glyoxal cross-linked polymer is modified high amylopectin starch
Aqueous solution spray is coated on cardboard, is dried.
The amylose and the ratio of amylopectin that the starch of different plant generations contains are different, some common shallow lakes
The visible table 1 below of the content of amylose and amylopectin of powder class plant：
The composition of some the common native starches of table 1.
The starch such as tapioca and waxy corn starch of high branching content of the present invention are in changing according to the present invention
Property prepare after show more preferable strengthening for paper effect and the stability of manufactured goods；Reinforcing agent prepared by the present invention is due to glyoxal
The distinctive good dewatering of cross-linked homopolymer, can significantly improve dehydration rate and raising of the paper on screen cloth in wet end of machine
Press section is dehydrated, and its mechanism is：Glyoxal cross-linked polymer can make it become free water with reference to water with high amylopectin starch reaction,
And then become easier to press dewatering；Combination between reinforcing fiber simultaneously, the rewetting of paper web, improves mass dryness fraction after reduction squeezing；
The raising of dehydration rate is to maintain the important prerequisite of speed, it is possible to reduce apply the reduction paper easily produced in common modifications starch slurry
The problem of locomotive is fast.
Glyoxal cross-linked polymer prepared by the present invention is modified high amylopectin starch as reinforcing agent, cationic polymeric molecule
Cation group, amide groups on chain etc. can produce ionic bonding, hydrogen bond between hydroxyl abundant on high amylopectin starch molecule
And chemical bonds, stable combination can be formed；, can be fine with paper after being sufficiently mixed after adding wet end of machine with paper pulp
Dimension forms stable Electrostatic Absorption, hydrogen bond and chemical bonding, and effective set modified starch and is adsorbed carefully on big fiber
Small fiber, can greatly improve initial journey retention rate and system retention, reach reduction white water consistency and greatly improve paper performance
Effect.
Compared with prior art, implementation result of the invention is as follows by the present invention：
1st, glyoxal cross-linked polymer of the present invention is modified high amylopectin starch and applies as reinforcing agent in slurry and can show
The cohesive force for improving Paper or cardboard is write, has significant enhancement effect to reclaim paper for the Paper or cardboard of raw material, to Paper or cardboard
The physical strengths such as anti-tensile pulling force, burst index, folding rate are significantly increased.
2nd, glyoxal cross-linked polymer of the present invention be modified high amylopectin starch as reinforcing agent cardboard surface spraying
Coating can significantly increase ring crush intensity.
3rd, glyoxal cross-linked polymer of the present invention is modified high amylopectin starch as reinforcing agent not only to papermaking enterprise
Paper product matter has raising substantially, and can improve the dehydration rate of wet web, reduces the combination water content of common modifications starch, has
Beneficial to paper machine speed is kept, optimize paper machine operation.
4th, glyoxal cross-linked polymer of the present invention is modified high amylopectin starch and is used as energy-conservation of the reinforcing agent to papermaking enterprise
Emission reduction also have it is very big benefit, with the white-water system of cleaning paper machine paper plant can be helped preferably to be sealed to white-water system
Closed loop, the COD and discharge capacity of a large amount of reduction plant chimney stalks, advantageously reduces the environmental pressure that papermaking enterprise is faced.
Embodiment
Illustrate present disclosure below in conjunction with specific embodiments.
Specific embodiment 1
A kind of glyoxal cross-linked polymer that the present embodiment is provided is modified the preparation method of high amylopectin starch, main original used
Material and inventory are referring to following table：
Preparation method comprises the following steps：
It is equipped with one in agitator, thermometer, 20 L reactors of reflux condenser, by 1275 g tapiocas and soft
Water in mass ratio for 6.25 ︰ 100 ratio mixing add, reactor be warming up to 120 DEG C stirring until tapioca be completely dissolved,
Then less than 60 DEG C are cooled to.
Take out tapioca solution to add with turbine stirrer, 2000 milliliters of flasks of RTD temperature sensor, stirring
Device mixing speed is mixed for 120 RPM, at 40 DEG C of temperature, polyacrylamide homo polymer is added（The dalton of molecular weight 10,000）135 g,
PDDA homopolymer（The dalton of molecular weight 10,000）15 g, the ten hydration g of tetra-na diphosphate 30, glyoxal
30 g, pH value is adjusted to 8.5 after stirring with appropriate sodium hydroxide and dilute sulfuric acid.
Reach after expected viscosity, adjust pH terminating reactions with the appropriate concentrated sulfuric acid, be eventually adding 1.5g bactericide Kathon CGs and obtain
Solid content is 20%, and viscosity is 120 mPas, and pH value is modified high amylopectin starch for 2.8 glyoxal cross-linked homopolymer.
Using recovery boxboard（OCC）U.S. useless/state gives up（50/50）After being mixed, discongested as raw material, being beaten, add
Obtained glyoxal cross-linked homopolymer is modified the high amylopectin starch aqueous solution 1%~4% as stated above（Corresponding to the weight of oven dry stock
Than）, stir 5 minutes, the 200 g/m2 write by hand scraps of paper must be quantified with handsheet mechanism, after drying, under the conditions of standard atmosphere
Balance 24 hours, determines its burst index and folding strength；As a result it is listed in table 2.
Table 2. reclaims boxboard（OCC）U.S. useless/state gives up（50/50）The intensity index of the write by hand scraps of paper
Specific embodiment 2
A kind of glyoxal cross-linked polymer that the present embodiment is provided is modified the preparation method of high amylopectin starch, main original used
Material and inventory are referring to following table：
Preparation method comprises the following steps：
Be equipped with one in agitator, thermometer, the 20L reactors of reflux condenser, by 1275 g waxy corn starch and
Soft water adds for 6.25 ︰ 100 ratio mixing in mass ratio, and reactor is warming up to 120 DEG C of stirrings until waxy corn starch is complete
Dissolving, then cools to less than 60 DEG C.
The addition of waxy corn starch solution is taken out to carry in turbine stirrer, 2000 milliliters of flasks of RTD temperature sensor,
Agitator mixing speed is 120 RPM, at 40 DEG C of temperature, adds polyacrylamide homo polymer（The dalton of molecular weight 10,000）135
G, PDDA homopolymer（The dalton of molecular weight 10,000）15 g, ten hydration tetra-na diphosphate 30 g, second two
The g of aldehyde 30, pH value is adjusted to 8.5 after stirring with appropriate sodium hydroxide and dilute sulfuric acid.
Reach after expected viscosity, adjust pH terminating reactions with the appropriate concentrated sulfuric acid, be eventually adding 1.5 g bactericide Kathon CGs and obtain
Solid content is 20%, and viscosity is 150 mPas, and pH value is modified high amylopectin starch for 2.5 glyoxal cross-linked homopolymer.
Using recovery boxboard（OCC）U.S. useless/state gives up（50/50）After being mixed, discongested as raw material, being beaten, hand is used
Handsheet mechanism must quantify the 200 g/m2 write by hand scraps of paper, obtained glyoxal cross-linked homopolymer will be modified high side chain as stated above
Amidin spray is coated on the write by hand scraps of paper；Consumption is 40 kgs/tonne of paper（The weight ratio of reinforcing agent/oven dry stock）, drying
Afterwards, balanced 24 hours under the conditions of standard atmosphere, determine its ring crush intensity；Experimental result is listed in table 3.
Table 3. reclaims boxboard（OCC）U.S. useless/state gives up（50/50）Handmade paper piece ring crush intensity index
Specific embodiment 3
The monomer of polyacrylamide in specific embodiment 1 is replaced with selected from acrylamide, N, N- DMAAs,
One or more non-ionic monomers in N, N- acrylamide, N- vinyl formamides；By in specific embodiment 2 poly- two
The monomer of methyl diallyl ammonium chloride replaces with the first selected from dimethyl diallyl ammonium chloride, dimethylamino ethyl acrylate
Base chlorine quaternary ammonium salt, the methyl chloride quaternary ammonium salt of Dimethylaminoethyl Methacrylate, the methyl chloride season of acrylic acid Of
Ammonium salt, the methyl chloride quaternary ammonium salt of diethylaminoethyl base ethyl ester, the methyl chloride quaternary ammonium salt of dimethylamino propyl acrylamide,
The methyl chloride quaternary ammonium salt of dimethylamino-propyl Methacrylamide, benzyl chloride quaternary ammonium salt, the methyl of dimethylamino ethyl acrylate
The benzyl chloride quaternary ammonium salt of dimethylamino ethyl acrylate, benzyl chloride quaternary ammonium salt, the methacrylic acid of acrylic acid Of
The benzyl chloride quaternary ammonium salt of Of, the benzyl chloride quaternary ammonium salt of dimethylamino propyl acrylamide, dimethylamino-propyl first
One or more cationic monomers in the benzyl chloride quaternary ammonium salt of base acrylamide；Remaining step of preparation method is with reference to specific real
Apply example 1.
With reference to the test method of specific embodiment 1, glyoxal cross-linked polymer made from specific embodiment 3 is modified high side chain
Amidin is as reinforcing agent addition in 40kg/ tons of oven dry stocks, and folding strength is more than 20, and burst index is 2.5 kPa
More than m2/g.
Specific embodiment 4
The monomer of polyacrylamide in specific embodiment 2 is replaced with selected from acrylamide, N, N- DMAAs,
One or more non-ionic monomers in N, N- acrylamide, N- vinyl formamides；By in specific embodiment 2 poly- two
The monomer of methyl diallyl ammonium chloride replaces with the first selected from dimethyl diallyl ammonium chloride, dimethylamino ethyl acrylate
Base chlorine quaternary ammonium salt, the methyl chloride quaternary ammonium salt of Dimethylaminoethyl Methacrylate, the methyl chloride season of acrylic acid Of
Ammonium salt, the methyl chloride quaternary ammonium salt of diethylaminoethyl base ethyl ester, the methyl chloride quaternary ammonium salt of dimethylamino propyl acrylamide,
The methyl chloride quaternary ammonium salt of dimethylamino-propyl Methacrylamide, benzyl chloride quaternary ammonium salt, the methyl of dimethylamino ethyl acrylate
The benzyl chloride quaternary ammonium salt of dimethylamino ethyl acrylate, benzyl chloride quaternary ammonium salt, the methacrylic acid of acrylic acid Of
The benzyl chloride quaternary ammonium salt of Of, the benzyl chloride quaternary ammonium salt of dimethylamino propyl acrylamide, dimethylamino-propyl first
One or more cationic monomers in the benzyl chloride quaternary ammonium salt of base acrylamide；Remaining step of preparation method is with reference to specific real
Apply example 1.
With reference to the test method of specific embodiment 2, glyoxal cross-linked polymer made from specific embodiment 4 is modified high side chain
Amidin is coated on the write by hand scraps of paper as reinforcing agent spray, and ring crush intensity is in 8.0 more than Nm/g.
Specific embodiment 5
The monomer of polyacrylamide in specific embodiment 1 is replaced with selected from acrylamide, N, N- DMAAs,
One or more nonionics in N, N- acrylamide, NIPA, N- vinyl formamides, acrylonitrile
Monomer；
The monomer of PDDA in specific embodiment 1 is replaced with selected from quaternary ammonium acrylate and
One or more cationic monomers in methacrylic acid ester quat；The quaternary ammonium acrylate and methacrylate season
Ammonium salt includes but is not limited to：Dimethylamino ethyl acrylate methyl chloride ammonium salt, dimethylamino ethyl acrylate methyl sulphur
Acid ammonium salt, dimethylaminoethyl acrylic acid benzyl chloride ammonium salt, dimethylamino ethyl acrylate sulfate, dimethyl aminoethyl
Acrylate hydrochloride, dimethylaminoethyl methacrylate methyl chloride ammonium salt, dimethylaminoethyl methyl methacrylate
Ammonium sulfate, dimethylaminoethyl methacrylic acid benzyl chloride ammonium salt, dimethylaminoethyl methacrylate sulfate, diformazan
Amidoethyl methacrylate hydrochloride, dimethylamino acrylamide methviium ammonium sulfate, dimethylamino acrylamide hydrochloric acid
Salt, Methacrylamide ammonium chlorine etc.；Remaining step of preparation method refers to specific embodiment 1.
With reference to the test method of specific embodiment 1, glyoxal cross-linked polymer made from specific embodiment 5 is modified high side chain
Amidin is as reinforcing agent addition in 40kg/ tons of oven dry stocks, and folding strength is more than 15, and burst index is more than 1.5 kPa
m2/g。
Specific embodiment 6
The monomer of polyacrylamide in specific embodiment 2 is replaced with selected from acrylamide, N, N- DMAAs,
One or more nonionics in N, N- acrylamide, NIPA, N- vinyl formamides, acrylonitrile
Monomer；
The monomer of PDDA in specific embodiment 2 is replaced with selected from quaternary ammonium acrylate and
One or more cationic monomers in methacrylic acid ester quat；The quaternary ammonium acrylate and methacrylate season
Ammonium salt includes but is not limited to：Dimethylamino ethyl acrylate methyl chloride ammonium salt, dimethylamino ethyl acrylate methyl sulphur
Acid ammonium salt, dimethylaminoethyl acrylic acid benzyl chloride ammonium salt, dimethylamino ethyl acrylate sulfate, dimethyl aminoethyl
Acrylate hydrochloride, dimethylaminoethyl methacrylate methyl chloride ammonium salt, dimethylaminoethyl methyl methacrylate
Ammonium sulfate, dimethylaminoethyl methacrylic acid benzyl chloride ammonium salt, dimethylaminoethyl methacrylate sulfate, diformazan
Amidoethyl methacrylate hydrochloride, dimethylamino acrylamide methviium ammonium sulfate, dimethylamino acrylamide hydrochloric acid
Salt, Methacrylamide ammonium chlorine etc.；Remaining step of preparation method refers to specific embodiment 1.
With reference to the test method of specific embodiment 2, glyoxal cross-linked polymer made from specific embodiment 6 is modified high side chain
Amidin is coated on the write by hand scraps of paper as reinforcing agent spray, and ring crush intensity is in 6.0 more than Nm/g.
Above content is made for the present invention in conjunction with specific embodiments describes in detail, it is impossible to assert that the present invention is specific real
Apply and be only limitted to these explanations.For those skilled in the art, before present inventive concept is not departed from
Put, some simple deduction or replace can also be made, the scope of protection of the invention should be all considered as belonging to.
Claims (6)
1. a kind of glyoxal cross-linked polymer is modified high amylopectin starch, it is characterized in that, including high amylopectin starch and for forming height
The polymer that the non-ionic monomer prepolymerization of molecule carbon skeleton is formed and the cationic monomer prepolymerization for introducing positive electricity
The polymer of formation, and the polymer and the cation mono that the high amylopectin starch, the non-ionic monomer prepolymerization are formed
The polymer that body prepolymerization is formed carries out the modification high amylopectin starch of cross-linking reaction formation block copolymerization by glyoxal；
The non-ionic monomer is selected from acrylamide, N, N- DMAAs, N, N- acrylamides, N- isopropyls
One or more in acrylamide, N- vinyl formamides, acrylonitrile；
One or more of the cationic monomer in quaternary ammonium acrylate and methacrylic acid ester quat；
And preparation method comprises the following steps：
Step 1: being in mass ratio by high amylopectin starch and soft water（1~20）︰ 100 ratio mixing, is warming up to 100~160 DEG C
Lower stirring and dissolving, after high amylopectin starch is completely dissolved, cools to less than 60 DEG C；
Step 2: into the solution of step one, adding polymer, cationic monomer prepolymerization that non-ionic monomer prepolymerization is formed
Homopolymer, glyoxal and the pH buffer of formation；In weak basic condition, cross-linking reaction, reaction are carried out below 40 DEG C of temperature
During, cross-linking reaction speed is controlled in the range of 7.5~9.5 with caustic-soda aqueous solution and dilute sulfuric acid the regulation pH value of dilution；
The pH buffer is selected from sulfuric acid, hydrochloric acid, phosphoric acid, acetic acid, sodium hydroxide, potassium hydroxide, strong acid weak base salt, strong base weak acid
One or more in salt；The consumption of the pH buffer is determined according to actual needs, adjusts the pH value of reaction mixture solution
Save between 7.5~9.5;
Step 3: viscosity at viscosimetric, 25 DEG C is constantly sampled in the course of reaction of step 2 reaches 100~1000 mPa s
Afterwards, add sulphur acid for adjusting pH value and stops reaction below 3.0, then plus soft water adjustment solid content is to 10wt%~20wt%, most
Antiseptic is added afterwards produces described glyoxal cross-linked polymer modification high amylopectin starch；
The antiseptic is selected from anilid class, imidazoles, thiazoles, isothiazolone derivative, quaternary ammonium salt, double croak classes, phenol
One or more in class；The consumption of antiseptic is that glyoxal cross-linked polymer is modified high amylopectin starch total product weight
0.01%~1%.
2. glyoxal cross-linked polymer as claimed in claim 1 is modified high amylopectin starch, it is characterized in that, the non-ionic monomer
Selected from acrylamide, N, N- DMAAs, N, N- acrylamides, one kind in N- vinyl formamides or many
Kind；The cationic monomer is selected from dimethyl diallyl ammonium chloride, the methyl chloride quaternary ammonium salt of dimethylamino ethyl acrylate, first
The methyl chloride quaternary ammonium salt of base dimethylamino ethyl acrylate, the methyl chloride quaternary ammonium salt of acrylic acid Of, metering system
The methyl chloride quaternary ammonium salt of diethylammonium salt base ethyl ester, the methyl chloride quaternary ammonium salt of dimethylamino propyl acrylamide, dimethylamino-propyl
The methyl chloride quaternary ammonium salt of Methacrylamide, the benzyl chloride quaternary ammonium salt of dimethylamino ethyl acrylate, dimethylaminoethyl acrylate methyl amine
The benzyl chloride quaternary ammonium salt of base ethyl ester, the benzyl chloride quaternary ammonium salt of acrylic acid Of, diethylaminoethyl base ethyl ester
Benzyl chloride quaternary ammonium salt, the benzyl chloride quaternary ammonium salt of dimethylamino propyl acrylamide, dimethylamino-propyl Methacrylamide
One or more in benzyl chloride quaternary ammonium salt.
3. glyoxal cross-linked polymer as claimed in claim 1 is modified high amylopectin starch, it is characterized in that, the non-ionic monomer
The polymer molecular weight that prepolymerization is formed is 1000~50000 dalton, the polymer that the cationic monomer prepolymerization is formed
Molecular weight is 1000~50000 dalton, and the molecular weight of the modified high amylopectin starch is 50 ten thousand to 500 ten thousand dalton.
4. glyoxal cross-linked polymer as claimed in claim 1 is modified high amylopectin starch as the application of paper making intensifier.
5. glyoxal cross-linked polymer as claimed in claim 4 is modified high amylopectin starch as the application of paper making intensifier, its
It is characterized in that method comprises the following steps：Raw material discongested, be beaten after, add the glyoxal cross-linked polymer and be modified high branch
The aqueous solution of chain starch, the glyoxal cross-linked polymer be modified the consumption of high amylopectin starch for oven dry stock quality 0.2%~
0.8%, can manufacture paper with pulp Paper or cardboard after being sufficiently stirred for.
6. glyoxal cross-linked polymer as claimed in claim 4 is modified high amylopectin starch as the application of paper making intensifier, its
It is characterized in that method comprises the following steps：Raw material discongested, be beaten after manufacture paper with pulp into cardboard, by the glyoxal cross-linked polymer
The aqueous solution spray of modified high amylopectin starch is coated on cardboard, is dried.
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