CN1157869A - Improving quality of coated paper - Google Patents
Improving quality of coated paper Download PDFInfo
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- CN1157869A CN1157869A CN 95121839 CN95121839A CN1157869A CN 1157869 A CN1157869 A CN 1157869A CN 95121839 CN95121839 CN 95121839 CN 95121839 A CN95121839 A CN 95121839A CN 1157869 A CN1157869 A CN 1157869A
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Abstract
An improved method for producing high-quality coated paper by coating the face paint containing inorganic pigment onto cellulose sheet with at least one precoated layer containing inorganic pigment includes that a sizing agent (up to 2 Wt.% with reference to weight of inorganic pigment), such as alkylketene dimer, is added to the precoated layer or at least one precoated layer. A composition used in the method is also disclosed.
Description
The present invention relates to the improvement method of the plain flaky material quality of coated fibres, this coated fiber cellulose sheet is to make by apply the coating composition that contains two or more inorganic pigments on cellulose films.
If want high-quality printed image is imposed on the cellulose films as paper or cardboard, need apply at least a one or more inorganic pigments such as kaolin, the CaCO of containing usually to the surface of this material
3, CaSO
4, TiO
2, BaSO
4, satin white etc. coating composition.Use smoothness, glossiness, whiteness and opacity that such coating composition has improved the surface of printed image to be applied.In many occasions,, need apply the coating composition that two-layer or multilayer contains pigment in order to obtain to desire the finishing coat surface of quality.
In general, in order from the fund that drops into the paper coating machine, to obtain maximum repayment, wish to move this coating machine with the practicable web speed of maximum.In addition, because coating composition is made up of pigment, adhesive and other possible solid ingredient that suspends in water, so need remove moisture content in the composition, so that make the coating drying by heating evaporation.For minimum degree ground consumes the energy of heating evaporation, wish that utilization has the coating composition of the high solid concentration of possibility.Yet, have found that when the finish compositions with suitable high solid concentration is applied on the basic paper of quite high water absorbing capacity, to also have a kind of like this trend, exactly when coating blade is used for removing excessive coating composition and flattens coating, this finish paint will be damaged by scratch and other defective.
The purpose of this invention is to provide a kind of method, wherein two or more coating are applied on the cellulose tablet base, and, in coating machine,, can obtain high-quality finishing coat surface with quite high chart speed with the coating materials composition of high solid concentration.
It is well-known using the waterproof chemical agent in the production of cellulose paper product.Can control water by known " applying glue " method and be inhaled into paper product.Two kinds of glue applying methods are arranged usually, i.e. internal sizing and top sizing.In internal sizing, before forming page, waterproofing agent is mixed with the cellulose fibre slurry.In top sizing,, the waterproofing agent that is generally starch in this case is applied on the page material of firm formation by paper web being passed the coating pan that is called " size press ".In general, in top sizing, the two sides of paper web all scribbles the waterproofing agent film.
For internal sizing, the most frequently used sizing agent is the rosin that precipitates in cellulose fibre suspension by adding aluminum sulfate.Yet this processing will make the pH of fibrous suspension reduce to about 4-6, as alkaline filler such as CaCO
3When mixing in this suspension, this processing will make it to be not suitable for.
For the cellulosic sheet that contains alkaline filler is carried out applying glue, developed the sizing agent that under neutrality or alkaline pH value, water resistance to be given cellulose fibre.The example of these sizing agents comprises, the alkyl ketene dimer class that discloses among the US2627477, and the alkenyl succinic anhydride class that discloses among the US3102064.
The invention provides a kind of coating materials that is easy to contain inorganic pigment and be applied to and scribble improving one's methods on the cellulose films of precoated shet that one deck at least contains inorganic pigment, this method comprises to this precoated shet or mixes in the inorganic pigment in one deck precoated shet at least to be that benchmark is at most to the sizing agents of 2% weight.
The present invention also provides a kind of coating process of cellulose films, this method comprises the precoated shet coated fiber cellulose sheet that contains inorganic pigment with one deck at least, with the finish paint that contains inorganic pigment it is coated with then, wherein, at this precoated shet or to contain in the inorganic pigment in one deck precoated shet at least be the most nearly sizing agent of 2% weight of benchmark.
The present invention further also is provided at the composition that forms the precoated shet that contains inorganic pigment on the cellulose films, and it is the most nearly sizing agent of 2% weight of benchmark that said composition contains in the inorganic pigment.
Sizing agent is the alkyl ketene dimer that is used as the routine of paper internal sizing under alkalescence or neutrallty condition.The general formula of such alkyl ketene dimer is as follows:
R is C in the formula
8-20Alkyl.
This sizing agent also can be styrene-maleic anhydride copolymers for example, allyl butyrate dianhydride or anion polyurethane.
Inorganic pigment in precoat composition and finish compositions all is selected from: kaolin, CaCO
3, TiO
2, CaSO
4, BaSO
4And satin white.Except that inorganic pigment, also will include in the inorganic pigment pigment adhesive of the 4-20% weight that is benchmark in finishing coat and the precoat composition, this adhesive is selected from usually: starch, the latex of the adhesive of protein such as casein and for example styrene butadiene ribber or acrylate copolymer.Described coating composition also will contain usually, be the dispersant that benchmark is counted the inorganic pigment of 0.02-1% weight with the pigment weight.
Weight in inorganic pigment is benchmark, and the applying glue dosage that is used for precoat composition is preferably 0.01-0.30% weight.
Fig. 1-4 relates to be used for illustrating the chart of the following example of the present invention.
Embodiment 1
At first prepare three kinds of coating compositions, so that the ground floor that is applied in two coatings that form double-deck coated paper on the basic paper to be provided.According to every kind of composition of following formulation:
Ingredients by weight part
CaCO
3Pigment 100
Adhesive 15
CaCO
3Pigment is the natural marble of pulverizing, and its particle diameter is distributed as: the equivalent sphere diameter of the particle of 60% weight is less than 2 μ m.
The adhesive that uses in each of three kinds of compositions is:
A, 15 weight portion starch
B, 12 weight portion starch and 3 weight portion latex solids
C, 10 weight portion starch and 5 weight portion latex solids.
Starch is the oxidised maize starch that Cerestar appears on the market with trade name " AMISOL 05591 ".Latex contains the styrene butadiene ribber polymer of 50% weight, and is appeared on the market with trade name " Dow 950 " by DowChemical Company.The latex amount of the prescription that is used for providing is above represented with the dry polymeric solid weight.
Every kind of composition is divided into two parts, 1 and 2.In the dry weight is benchmark, adds per 100 weight portion CaCO in part 1
3Pigment is the weak cation alkyl alkene ester dimer of 0.25 weight portion, and the latter is appeared on the market with trade name " AQUAPEL C519 " by Hercules Corporation.
By the laboratory coating machine that discloses among the GB1032536, every kind of composition is applied on the basic paper not applying glue, suction, wood-free with the chart speed of 400m/min.In all cases, all by coating was dried 2 minutes and dry coating.
Then, by implementing the small-sized scraper apparatus for coating in chamber, scribble every kind of pattern of first coating composition with second composition of following prescription.
Ingredients by weight part
Thin CaCO
3Pigment 100
Latex adhesive 12
Sodium carboxymethylcellulose 1
Thin CaCO
3The natural marble of pigment for pulverizing, its particle diameter is distributed as: the equivalent sphere diameter of the particle of 95% weight is less than 2 μ m.Used the same of latex adhesive and priming coat, the product that the Metsa Serla of sodium carboxymethylcellulose appears on the market with trade name " FINNFIX 5 ".Every kind of every kind of pattern that scribbles six kinds of first different coating compositions being divided into many parts, and changing the pressure of scraper in the apparatus for coating, is 8-20g/m thereby obtain a series of weight per unit areas
2Second composition.
This apparatus for coating is equipped with the instrument of monitoring the second coating composition rate of drying by the intensity of measuring the coated paper surface reflection.Just from scraper below by coating be even wet, thereby to strong reflection only.Yet after coating was dried, its appearance became unglazed.Tunable light source and detector are installed in the apparatus for coating top.With with the paper surface normal be that 75 ° of angles are sent incident beam and are that tested light beam is detected at 75 ° of angles with the surface normal with paper.The signal of detector is delivered to the input of personal computer by the voltage measurement interface.This calculates 15000 luminous intensity measurement values of function record as many as per second, to provide per second 150 data points, calculates the mean value of 100 such measured values, to obtain each data point.
For every kind of applied pattern, be to carry out on the paper intensity of reflected light measurement in about 2 seconds.Start apparatus for coating then, and by the drying curve of computer recording luminous intensity to the time.Typical drying curve is got such form: get initial light intensity degree difference and be about zero when scraper is below light source and detector, when wet paint film was exposed, luminous intensity increased sharply then.Then, when coating is dry, luminous intensity will begin to descend, and finally constant, thereby provide the catoptrical measured value of dry coating paper.For every part of pattern, rate of drying is represented with drying parameter δ.Map by luminous intensity and time rate of change, and begin the maximal positive slope of dry time intensity/time graph and read δ in the time interval between this curve maximum negative slope when intensity rate of change maximum and coating are in the part drying regime in coating.
Each of six kind of first coating composition is made the curve map of drying parameter δ to coating weight, the results are shown in Fig. 1-3.Fig. 1 has provided and has contained and do not contained first coating composition A1 of alkyl ketene dimer and the result of A2 respectively; Fig. 2 has provided the result of the first coating composition B1 and B2, and Fig. 3 has provided the result of the first coating composition C1 and C2.
Be to be noted that in each case, though drying parameter δ and drying time increase with coating weight, but, with regard to regard to the every kind of adhesive composition that uses in each coating composition, when alkyl ketene dimer was added to first coating composition, the second coating drying was slower.
With four kinds of first different coating composition precoatings quantitatively is 83g/m
2, the batch of material of the suction base paper of wood-free, every kind of composition is prepared according to surface compositions down:
Ingredients by weight part
CaCO
3Pigment 100
Oxidized starch adhesive 18
NaOH to pH8.5
Alkyl ketene dimer sees below
Water to 62% solid
CaCO
3Used identical in first coating composition in pigment and the example 1.
The amount of alkyl ketene dimer is respectively the active alkyl ketene dimer of 0,0.02,0.05 and 0.1 weight portion concerning per 100 weight portion pigment in four kinds of compositions.Used identical in this alkyl ketene dimer and the example 1.When using, after below 40 ℃, alkyl ketene dimer is joined in the said composition in the temperature of amylum adhesive.
All by the coating machine that the pilot-scale that is coated with roller and scraper is housed, first coating composition is imposed on the basic paper in all cases with the chart speed of 600m/min and 49 ° the nose angle of scraping.Regulate scraper pressure to obtain 10g/m
2Coating weight.In order to make the curling minimum of paper during second application step, also first coating composition is applied to the reverse side of paper web, coating weight is 8.5g/m
2
After first coating composition is applied on every batch of paper, by being that 60 ℃, line pressure are two nips of supercalender of 50KN/m and its surface of press polish with the speed of 600m/min by temperature with coated paper.
Then, second coating composition of the following surface compositions of usefulness scribbles every part of pattern of first coating composition:
Ingredients by weight part
Thin CaCO
3Pigment 100
Styrene butadiene latices 12
Sodium carboxymethylcellulose 1
Optical Bleaching Agent 0.5
Thin CaCO
3Used identical in pigment, latex and sodium carboxymethylcellulose and the example 1.
By the coating machine that the pilot-scale that is coated with roller and scraper is housed, second coating is applied on the paper of every batch of pre-coating.Scraper pressure is constant to be 9g/m providing the second coating coating weight
2Desired value.
Detect the flowability or the resistance to scraping of second coating by following step:
At first, second coating is applied on the basic in batches paper that scribbles first coating composition that does not contain alkyl ketene dimer in advance.Second coating composition is the chart speed at 300m/min, can apply 9g/m
2The high solid concentration of coating weight is coated with.Then, increase chart speed, till observing cut at the scraper place.When observing cut, change this base paper into scribble first coating composition that contains some alkyl ketene dimers in advance basic paper, and, second coating is applied on this paper keeping second coating composition and coating machine to equip under the constant situation.If observe improvement to resistance to scraping, so just increase chart speed, until observing cut, or reach till the 800m/min until chart speed.
Then, water is diluted to the solid weight of about 1-2% with second coating composition, and is applied on the basic paper that scribbles first coating that does not contain alkyl ketene dimer in advance.Repeat this step then, till during second coating being applied on the basic paper that scribbles first coating that does not contain alkyl ketene dimer in advance, detecting less than cut.
Then, use the basic paper that scribbles first coating composition that contains different amount alkyl ketene dimers in advance to repeat whole steps.
The results are shown in following table 1:
Amount (pph) the solid weight % of chart speed (m/min) observed result dimer in alkyl ketene second coating in table 1 priming coat
0 69.0 300 frequent cuts
0 67.4 300 slight cuts
0 65.7 300 slight cuts
0 63.9 300 no markings
0.02 68.4 300 slight cuts
0.02 66.8 300 no markings
0.02 66.8 800 no markings
0.05 66.6 800 no markings
0.10 68.6 300 no markings
0.10 68.6 600 occur cut again
0.10 66.9 600 no markings are annotated: the parts by weight of the per 100 weight portion pigment of " pph " expression.
These results show that when second coating composition being applied on the basic paper that scribbles first coating composition that does not contain alkyl ketene dimer in advance with high solid concentration (68-69% weight), cut is the most obvious.When the curing concentration with 68-69% weight was coated with second coating composition, only 0.02 weight portion alkyl ketene dimer being mixed just was enough to reduce significantly cut in first coating composition.When coating contained first coating of 0.1 weight portion alkyl ketene dimer, under identical condition, during coating second coating composition, cut was eliminated fully.
Three kinds of first different coating composition precoatings with following surface compositions quantitatively are 94g/m
2, wood-free the blotting paper batch of material:
1,100 weight portion CaCO
3Pigment A; 15 weight portion oxidised maize starch.
2,100 weight portion CaCO
3Pigment B; 15 weight portion oxidised maize starch; 0.6 weight portion benzene
The sodium salt of ethene-maleic acid.
3,100 weight portion CaCO
3Pigment A; 15 weight portion oxidised maize starch; 0.25 weight portion alkenyl succinic anhydride.
CaCO
3Used identical in pigment A and example 1 first coating composition.
CaCO
3Pigment B is similar to CaCO for being crushed to the particle diameter distributional class
3The natural marble of pigment A, different is that it is the aqueous dispersion of low solid concentration and does not have dispersant.
That uses in oxidised maize starch and the example 1 is identical.
The sodium salt of styrene-maleic acid is provided with trade name " SMA 3000 " by Atochem.
The alkenyl succinic anhydride is provided with trade name " CLAYSIZE PR4 " by Claymore Chemicals Limited.
In all cases, oxidised maize starch is all to be added in the coating composition in 90 ℃ of forms of boiling 20 minutes 30% weight solution before interpolation.
Under the situation of composition 1 and 3, the starch solution that boiled is added into and contains 78% weight CaCO
3In the aqueous dispersion of pigment A and Sodium Polyacrylate dispersant.Under the situation of composition 3, the alkenyl succinic anhydride is sneaked in the composition that will be coated with immediately.
By 1333g being contained the anhydrous CaCO of 75% weight
3The agglomerate of pigment B mixes with the sodium salt of 6g styrene-maleic acid, and preparation composition 2.Obtain the CaCO that solid concentration is 74.4% weight
3The deflocculation suspension of pigment.
By the laboratory coating machine described in the example 1, scrape nose angle with the chart speed of 400m/min and 35 °, every kind first coating composition is applied on the basic paper.If necessary, can regulate scraper angle, be 8.0 ± 0.5g/m thereby provide concerning every kind first composition
2Coating weight.By the Infrared Heating in 25 seconds and the thermal air current dry coating in 25 seconds subsequently, in coating, blow the cold air in 25 seconds subsequently.
By laboratory pilot scale scraper apparatus for coating, use second coating composition coating of surface compositions down to scribble every part of pattern of first coating composition then:
Ingredients by weight part
Thin CaCO
3Pigment 100
Latex adhesive 12
Sodium carboxymethylcellulose 1
Thin CaCO
3Used identical in pigment, latex adhesive and sodium carboxymethylcellulose and the example 1.The every kind of pattern of each is divided into mass part in three kinds of first different coating compositions with scribbling, and changes the scraper pressure of lab scale apparatus for coating, thereby obtains a series of 8-20g/m
2The different weight of per unit area second coating composition.For every kind first coating composition, δ maps to coating weight according to drying parameter, the results are shown in Fig. 4.As can be seen, for first coating composition 1 of contrast, increase along with the coating weight of second composition, it is constant that drying parameter keeps substantially, and under the situation of first composition 2 according to the present invention and 3, along with the increase of the second composition coating weight, drying parameter progressively increases, this shows that when sizing agent being added in first composition, the drying of second coating is more slow.
With three kinds of first different coating composition precoatings quantitatively is 83g/m
2, wood-free suction base paper batch of material, every kind of composition all is prepared according to surface compositions down:
Ingredients by weight part
CaCO
3Pigment 100
Oxidized starch adhesive 18
NaOH to pH8.5
Sizing agent sees below
Water to 62% solid
CaCO
3Used identical in pigment and example 1 first coating composition.
Sizing agent is the anion polyurethane that EKa Nobel appears on the market with trade name " CYCLOPALA ", and the consumption in three kinds of compositions is respectively per 100 weight portion pigment 0,0.1 and 0.2 weight portion active anion polyurethane.Before amylum adhesive, anion polyurethane is added in the composition.
In all cases all by the pilot-scale coating machine that is coated with roller and scraper is housed, the nose angle of scraping with the chart speed of 600m/min and 49 ° is applied to first coating composition on the basic paper.Regulate scraper pressure, to obtain 10g/m
2Coating weight.In this case, need not first coating is applied to the reverse side of paper web, this is to have the cause of enough curling resistances because found the paper that only is coated with in one side.
After being applied to first coating on every batch of paper stock, by with the speed of 600m/min with coated paper by 60 ℃, two supercalendered nips of 50KN/m line pressure and its surface of press polish.
Then, use second coating composition coating of surface compositions down to scribble every kind of pattern of first coating composition:
Ingredients by weight part
Thin CaCO
3Pigment 100
Styrene butadiene latices 12
Sodium carboxymethylcellulose 1
Optical Bleaching Agent 0.5
Thin CaCO
3Used identical in pigment, latex and sodium carboxymethylcellulose and the example 1.
The coating machine of the pilot-scale that is coated with roller and scraper is equipped with in utilization, and second coating is applied on every batch of pre-coating paper.Can obtain 9g/m with scraper pressure is constant
2The desired value of coating weight of second coating.
Detect the flowability and the anti-scratch performance of second coating by example 2 described steps.The results are shown in following table 2:
Table 2 has the weight % of anion amount (pph) solid of chart speed (m/min) observed result polyurethane in second coating in the priming coat
0 69.2 500 frequent cuts
0 69.2 1000 frequent cuts
0 67.2 500 no markings
0.1 69.0 500 slight cuts
0.1 69.0 1000 no markings
0.2 69.1 300 no markings
0.2 69.1 1000 no markings
These results show, when the solid concentration with about 69% weight is coated with second coating composition, the anion polyurethane that to mix per 100 weight portion pigment in first coating composition be 0.1 weight portion will reduce cut widely.
Claims (19)
1. a coating materials that is easy to contain inorganic pigment is applied to and scribbles improving one's methods on the cellulose films of precoated shet that one deck at least contains inorganic pigment, and this method comprises to this precoated shet or to mix in inorganic pigment weight in one deck precoated shet at least be the sizing agent that benchmark mostly is 2% weight most.
2. coating process to cellulose films, this method comprises the precoated shet coated fiber cellulose sheet that contains inorganic pigment with one deck at least, with the coating materials that contains inorganic pigment it is coated with then, wherein, at this precoated shet or to have in inorganic pigment weight in one deck precoated shet at least be the sizing agent that benchmark mostly is 2% weight most.
3. according to the method for claim 2, wherein inorganic pigment is kaolin, CaCO
3, TiO
2, CaSO
4, BaSO
4Or satin white.
4. according to the method for claim 2, wherein sizing agent is an alkyl ketene dimer.
5. according to the method for claim 2, wherein the consumption of sizing agent is that benchmark is counted 0.01-0.30% weight with inorganic pigment weight.
6. according to the method for claim 2, precoat composition and/or coating materials composition also contain adhesive in addition.
7. according to the method for claim 6, wherein adhesive is starch, casco or polymer emulsion.
8. according to the method for claim 6, wherein adhesive consumption is that benchmark is counted 4-20% weight with inorganic pigment weight.
9. according to the method for claim 2, wherein precoat composition and/or coating materials composition also contain dispersant in addition.
10. according to the method for claim 9, wherein the consumption of dispersant is that benchmark is counted 0.02-1% weight with inorganic pigment weight.
11. a composition that forms the precoated shet that contains inorganic pigment on cellulose films, it is the sizing agent that benchmark mostly is 2% weight most that said composition contains in inorganic pigment weight.
12. according to the composition of claim 11, wherein inorganic pigment is kaolin, CaCO
3, TiO
2, CaSO
4, BaSO
4Or satin white.
13. according to the composition of claim 11, wherein sizing agent is an alkyl ketene dimer.
14. according to the composition of claim 11, wherein the consumption of sizing agent is that benchmark is counted 0.01-0.30% weight with inorganic pigment weight.
15. according to the composition of claim 11, wherein precoat composition and/or coating materials composition also contain adhesive in addition.
16. according to the composition of claim 15, wherein adhesive is starch, casco or polymer emulsion.
17. according to the composition of claim 15, wherein adhesive consumption is that benchmark is counted 4-20% weight with inorganic pigment weight.
18. according to the composition of claim 11, wherein said composition also contains dispersant in addition.
19. according to the composition of claim 18, wherein the consumption of dispersant is that benchmark is counted 0.02-1% weight with inorganic pigment weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95121839 CN1157869A (en) | 1995-11-30 | 1995-11-30 | Improving quality of coated paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95121839 CN1157869A (en) | 1995-11-30 | 1995-11-30 | Improving quality of coated paper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1157869A true CN1157869A (en) | 1997-08-27 |
Family
ID=5082505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95121839 Pending CN1157869A (en) | 1995-11-30 | 1995-11-30 | Improving quality of coated paper |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1157869A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101040085B (en) * | 2004-09-30 | 2010-09-08 | 阿尔诺维根斯精细纸品有限公司 | Multi-layer coated products and curtain coating process for same |
-
1995
- 1995-11-30 CN CN 95121839 patent/CN1157869A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101040085B (en) * | 2004-09-30 | 2010-09-08 | 阿尔诺维根斯精细纸品有限公司 | Multi-layer coated products and curtain coating process for same |
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