CN112663387A - Preparation method of high-solid-content low-viscosity water-based lubricant for papermaking coating - Google Patents
Preparation method of high-solid-content low-viscosity water-based lubricant for papermaking coating Download PDFInfo
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- CN112663387A CN112663387A CN202011508346.4A CN202011508346A CN112663387A CN 112663387 A CN112663387 A CN 112663387A CN 202011508346 A CN202011508346 A CN 202011508346A CN 112663387 A CN112663387 A CN 112663387A
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- glyceryl stearate
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- 239000000314 lubricant Substances 0.000 title claims abstract description 44
- 238000000576 coating method Methods 0.000 title claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 239000011248 coating agent Substances 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000002270 dispersing agent Substances 0.000 claims abstract description 26
- VBICKXHEKHSIBG-UHFFFAOYSA-N 1-monostearoylglycerol Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229940075529 glyceryl stearate Drugs 0.000 claims abstract description 25
- 239000007787 solid Substances 0.000 claims abstract description 19
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229940051841 polyoxyethylene ether Drugs 0.000 claims abstract description 17
- 229920000056 polyoxyethylene ether Polymers 0.000 claims abstract description 17
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims abstract description 17
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims abstract description 17
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 239000003513 alkali Substances 0.000 claims abstract description 12
- 229920005552 sodium lignosulfonate Polymers 0.000 claims abstract description 10
- LCRMGUFGEDUSOG-UHFFFAOYSA-N naphthalen-1-ylsulfonyloxymethyl naphthalene-1-sulfonate;sodium Chemical compound [Na].C1=CC=C2C(S(=O)(OCOS(=O)(=O)C=3C4=CC=CC=C4C=CC=3)=O)=CC=CC2=C1 LCRMGUFGEDUSOG-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229920000642 polymer Polymers 0.000 claims abstract description 5
- HLPHHOLZSKWDAK-UHFFFAOYSA-M sodium;formaldehyde;naphthalene-1-sulfonate Chemical compound [Na+].O=C.C1=CC=C2C(S(=O)(=O)[O-])=CC=CC2=C1 HLPHHOLZSKWDAK-UHFFFAOYSA-M 0.000 claims abstract description 5
- 229920000877 Melamine resin Polymers 0.000 claims abstract description 4
- IVJISJACKSSFGE-UHFFFAOYSA-N formaldehyde;1,3,5-triazine-2,4,6-triamine Chemical compound O=C.NC1=NC(N)=NC(N)=N1 IVJISJACKSSFGE-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000009775 high-speed stirring Methods 0.000 claims description 8
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 6
- IMNIMPAHZVJRPE-UHFFFAOYSA-N triethylenediamine Chemical compound C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 claims description 6
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 3
- DWHOIYXAMUMQTI-UHFFFAOYSA-L disodium;2-[(1-sulfonatonaphthalen-2-yl)methyl]naphthalene-1-sulfonate Chemical compound [Na+].[Na+].C1=CC2=CC=CC=C2C(S(=O)(=O)[O-])=C1CC1=CC=C(C=CC=C2)C2=C1S([O-])(=O)=O DWHOIYXAMUMQTI-UHFFFAOYSA-L 0.000 claims description 3
- 239000002585 base Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 230000001050 lubricating effect Effects 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 10
- 239000008367 deionised water Substances 0.000 description 8
- 229910021641 deionized water Inorganic materials 0.000 description 8
- 238000007599 discharging Methods 0.000 description 7
- 238000001914 filtration Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- -1 fatty acid salts Chemical class 0.000 description 4
- 238000010790 dilution Methods 0.000 description 3
- 239000012895 dilution Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 238000003490 calendering Methods 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 238000010410 dusting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 239000004816 latex Substances 0.000 description 2
- 229920000126 latex Polymers 0.000 description 2
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- RYYKJJJTJZKILX-UHFFFAOYSA-M sodium octadecanoate Chemical group [Na+].CCCCCCCCCCCCCCCCCC([O-])=O RYYKJJJTJZKILX-UHFFFAOYSA-M 0.000 description 2
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical group [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- XEGMDUOAESTQCC-UHFFFAOYSA-N 1-(naphthalen-1-ylmethyl)naphthalene;sodium Chemical compound [Na].C1=CC=C2C(CC=3C4=CC=CC=C4C=CC=3)=CC=CC2=C1 XEGMDUOAESTQCC-UHFFFAOYSA-N 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 239000003899 bactericide agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003578 releasing effect Effects 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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Abstract
The invention discloses a preparation method of a high-solid-content low-viscosity aqueous lubricant, which is obtained by mixing and reacting the components of glyceryl stearate, isomeric alcohol polyoxyethylene ether, sodium hexametaphosphate, alkali, a dispersant and water, wherein the dispersant is selected from at least one of sodium lignosulfonate, sodium methylene dinaphthalene sulfonate, a melamine-formaldehyde polycondensate and a sodium naphthalenesulfonate formaldehyde polymer; the weight contents of the components are as follows: 100 parts of glyceryl stearate, 18-50 parts of isomeric alcohol polyoxyethylene ether, 8-30 parts of sodium hexametaphosphate, 3-20 parts of alkali, 0.5-5 parts of dispersing agent and 200 parts of water. Compared with the prior art, the high-solid-content water-based lubricant for the papermaking coating can improve the rheological property of the coating, has high solid content, good lubricating effect and low viscosity, and does not need to be diluted when in use.
Description
Technical Field
The invention relates to the technical field of papermaking lubricants, in particular to a preparation method of a high-solid-content low-viscosity aqueous lubricant.
Background
The lubricant generally contains hydrophobic groups in chemical composition, and has a lubricating effect and a releasing effect. Lubrication is an action of reducing friction, wear, and frictional heat of a contact surface; the release effect is an action of reducing the adhesion of the contact surface. Specifically, the lubricant can prevent sheet dusting at calenders, drying cylinders, etc. in the production of coated paper and dusting of coated paper in printing operations; the release property of the coated paper on the cast coating cylinder is improved; imparting slip properties to the paper and reducing friction.
The lubricant is one of trace additives in the coating of the coated and processed paper, and has an important function of improving the coating structure of the coated paper. The lubricant has the functions of reducing the friction coefficient of a coating in the papermaking coating, improving the rheological property of the coating, further improving the flatness of the coating and improving the glossiness of finished paper. The current paper-making lubricant in the market mainly comprises high-grade fatty acid salts and high-molecular oxidized polyethylene, and also comprises wax emulsion and the like, and the high-grade fatty acid salts and the high-molecular oxidized polyethylene have the function of improving the friction coefficient of a coating.
Chinese patent CN106368057A discloses a preparation method of an aqueous lubricant, which is obtained by mixing and reacting the components of glyceryl stearate, isomeric alcohol polyoxyethylene ether, sodium hexametaphosphate, alkali, a bactericide and water. The aqueous lubricant obtained by the method is applied to papermaking coating, can improve the smoothness and the glossiness of paper, but has the problems of low solid content, high viscosity, poor rheological property and the like.
Disclosure of Invention
The invention aims to provide a preparation method of a high-solid-content low-viscosity water-based lubricant, so as to solve the defects in the background art.
The invention is realized by the following technical scheme:
a preparation method of a high-solid-content low-viscosity aqueous lubricant is provided, wherein the high-solid-content low-viscosity aqueous lubricant is obtained by mixing and reacting the components of glyceryl stearate, isomeric alcohol polyoxyethylene ether, sodium hexametaphosphate, alkali, a dispersing agent and water, wherein the dispersing agent is at least one selected from sodium lignosulfonate, methylene dinaphthalene sodium sulfonate, a melamine-formaldehyde polycondensate and a sodium naphthalenesulfonate formaldehyde polymer; the weight contents of the components are as follows: 100 parts of glyceryl stearate, 18-50 parts of isomeric alcohol polyoxyethylene ether, 8-30 parts of sodium hexametaphosphate, 3-20 parts of alkali, 0.5-5 parts of dispersing agent and 200 parts of water.
Further, the preparation method of the high-solid-content low-viscosity aqueous lubricant specifically comprises the following steps:
step 1, melting glyceryl stearate at 85-95 ℃ for later use;
step 2, uniformly mixing the isomeric alcohol polyoxyethylene ether, sodium hexametaphosphate, alkali and all water, completely dissolving to obtain a kettle bottom material, and heating to 85-95 ℃; adding the molten solution of the glyceryl stearate in the step 1 under high-speed stirring, and uniformly stirring;
step 3, adding a dispersing agent at 85-95 ℃, and uniformly stirring;
and 4, cooling to 20-40 ℃, and adjusting the pH value to 6-10 to prepare the water-based lubricant.
The alkali is at least one selected from diethanolamine, triethanolamine, triethylene diamine, sodium hydroxide and potassium hydroxide, preferably diethanolamine.
The dispersant is at least one selected from sodium lignosulfonate, sodium methylene dinaphthalene sulfonate, melamine-formaldehyde polycondensate and sodium naphthalene sulfonate-formaldehyde polymer, preferably sodium lignosulfonate or sodium methylene dinaphthalene sulfonate, and most preferably sodium lignosulfonate.
As a preferred technical scheme, the weight content of each component is as follows: 100 parts of glyceryl stearate, 18-22 parts of isomeric alcohol polyoxyethylene ether, 8-12 parts of sodium hexametaphosphate, 3-7 parts of alkali, 0.8-1.2 parts of dispersing agent and 130 parts of water 110-.
Further, the temperature in the step 2 is raised to 85-90 ℃, and the stirring speed is 1000-.
Preferably, the temperature in the step 2 is raised to 85 ℃, and the stirring speed is 1000-.
Further, adding a dispersing agent in the step 3, stirring uniformly, and homogenizing by using a high-pressure homogenizer. The pressure of the high-pressure homogenizer is 20-30MPa, preferably 20 MPa.
In a second aspect of the present invention, there is provided a high solid content low viscosity aqueous lubricant prepared by the above method.
Further, the high-solid low-viscosity aqueous lubricant has a solid content of 40-60% by weight, a viscosity of 50-250mPa s at 25 ℃ and a pH value of 7-10.
The water-based lubricant with high solid content and low viscosity for the papermaking coating prepared by the method can be directly added in the coating preparation process without dilution, and the addition amount is 0.2-0.5% of oven-dried pigment.
Compared with the prior art, the high-solid-content water-based lubricant for the papermaking coating and the preparation method thereof have the advantages that: reasonable design, simple process, low cost, high solid content, good lubricating effect, low viscosity and no need of dilution when in use, and can improve the rheological property of the coating.
Detailed Description
The invention is illustrated below by means of specific examples, without being restricted thereto. All the raw materials are conventional commercial products unless otherwise specified.
Example 1
Step 1, melting 100g of glyceryl stearate at 85 ℃ for later use;
step 2, adding 20g of isomeric alcohol polyoxyethylene ether, 10g of sodium hexametaphosphate, 5g of diethanolamine and 120g of deionized water into a reaction kettle, uniformly mixing, completely dissolving, and heating to 85 ℃; adding the melted liquid of the glyceryl stearate in the step 1 under high-speed stirring (1000r/min), and stirring for 15 minutes;
step 3, adding 1g of sodium lignosulphonate, continuing stirring for 10 minutes, homogenizing for one time at 20MPa by a high-pressure homogenizer, and filtering and discharging by using a 100-mesh screen;
and step 4, cooling to 25 ℃, wherein the weight solid content of the obtained aqueous lubricant is 53.10 wt%, the viscosity is 56mPa & s (measured by an NDJ-1 rotary viscometer), and the pH is 7.16 (measured by a PHS-3C precision pH meter).
Example 2
Step 1, melting 100g of glyceryl stearate at 95 ℃ for later use;
step 2, adding 50g of isomeric alcohol polyoxyethylene ether, 30g of sodium hexametaphosphate, 20g of sodium hydroxide and 150g of deionized water into a reaction kettle, uniformly mixing, completely dissolving, and heating to 95 ℃; adding the melted liquid of the glyceryl stearate in the step 1 under high-speed stirring (5000r/min), and stirring for 30 minutes;
step 3, adding 2g of sodium methylene dinaphthalene sulfonate, continuing stirring for 10 minutes, homogenizing once at 20MPa by a high-pressure homogenizer, and filtering and discharging by using a 100-mesh screen;
and step 4, cooling to 25 ℃, wherein the weight solid content of the obtained aqueous lubricant is 57.15 wt%, the viscosity is 121mPa & s (measured by an NDJ-1 rotary viscometer), and the pH is 8.64 (measured by a PHS-3C precision pH meter).
Example 3
Step 1, melting 100g of glyceryl stearate at 90 ℃ for later use.
Step 2, adding 40g of isomeric alcohol polyoxyethylene ether, 20g of sodium hexametaphosphate, 5g of potassium hydroxide, 5g of triethylene diamine and 115g of deionized water into a reaction kettle, uniformly mixing, completely dissolving, and heating to 90 ℃; the molten solution of the glyceryl stearate in the step 1 is added under high-speed stirring (3000r/min) and stirred for 20 minutes.
Step 3, adding 1g of sodium lignosulfonate and 2g of sodium methylenedinaphthalene sulfonate, continuing stirring for 30 minutes, homogenizing for one time at 20MPa by a high-pressure homogenizer, and filtering and discharging by using a 100-mesh screen;
and step 4, cooling to 25 ℃, wherein the weight solid content of the obtained aqueous lubricant is 59.14 wt%, the viscosity is 210mPa & s (measured by an NDJ-1 rotary viscometer), and the pH is 9.12 (measured by a PHS-3C precision pH meter).
Example 4
Step 1, melting 100g of glyceryl stearate at 92 ℃ for later use;
step 2, adding 30g of isomeric alcohol polyoxyethylene ether, 15g of sodium hexametaphosphate, 6g of triethanolamine, 7g of sodium hydroxide and 230g of deionized water into a reaction kettle, uniformly mixing, completely dissolving, and heating to 92 ℃; adding the melted liquid of the glyceryl stearate in the step 1 under high-speed stirring (4000r/min), and stirring for 10 minutes;
step 3, adding 1g of sodium lignosulfonate, 1g of sodium methylenedinaphthalenesulfonate and 1g of sodium naphthalenesulfonate formaldehyde polymer, continuing stirring for 20 minutes, homogenizing once at 20MPa by using a high-pressure homogenizer, and filtering and discharging by using a 100-mesh screen;
and step 4, cooling to 25 ℃, wherein the weight solid content of the obtained aqueous lubricant is 40.55 wt%, the viscosity is 111mPa & s (measured by an NDJ-1 rotary viscometer), and the pH is 9.55 (measured by a PHS-3C precise pH meter).
Comparative example 1
In step 3, no dispersant is added, and the mixture is homogenized by a high-pressure homogenizer, and is directly filtered and discharged by a 100-mesh screen, and the rest is the same as that in example 1.
Comparative example 2
In step 3, no dispersant is added, and the mixture is homogenized by a high-pressure homogenizer, and is directly filtered and discharged by a 100-mesh screen, and the rest is the same as that in example 2.
Comparative example 3
In step 3, no dispersant is added, and the mixture is homogenized by a high-pressure homogenizer, and is directly filtered and discharged by a 100-mesh screen, and the rest is the same as that in example 3.
Comparative example 4
In step 3, no dispersant is added, and the mixture is homogenized by a high-pressure homogenizer, and is directly filtered and discharged by a 100-mesh screen, and the rest is the same as that in example 4.
Comparative example 5
And 3, adding the dispersing agent in the step 3, then only adopting conventional mixing, not adopting a high-pressure homogenizer for homogenizing, and the rest is the same as the example 1.
Comparative example 6
The preparation process was the same as in example 1 except that the dispersant was replaced with a sodium polyacrylate dispersant.
Step 1, melting 100g of glyceryl stearate at 85 ℃ for later use;
step 2, adding 20g of isomeric alcohol polyoxyethylene ether, 10g of sodium hexametaphosphate, 5g of diethanolamine and 120g of deionized water into a reaction kettle, uniformly mixing, completely dissolving, and heating to 85 ℃; adding the melted liquid of the glyceryl stearate in the step 1 under high-speed stirring (1000r/min), and stirring for 15 minutes;
step 3, adding 1g of sodium polyacrylate, continuously stirring for 10 minutes, homogenizing for one time at 20MPa by a high-pressure homogenizer, and filtering and discharging by using a 100-mesh screen;
and step 4, cooling to 25 ℃, wherein the weight solid content of the obtained aqueous lubricant is 53.04 wt%, the viscosity is 495mPa & s (measured by an NDJ-1 rotary viscometer), and the pH is 8.76 (measured by a PHS-3C precision pH meter).
Comparative example 7
The procedure is as in example 1 except that the dispersant is replaced with sodium stearate.
Step 1, melting 100g of glyceryl stearate at 85 ℃ for later use;
step 2, adding 20g of isomeric alcohol polyoxyethylene ether, 10g of sodium hexametaphosphate, 5g of diethanolamine and 120g of deionized water into a reaction kettle, uniformly mixing, completely dissolving, and heating to 85 ℃; adding the melted liquid of the glyceryl stearate in the step 1 under high-speed stirring (1000r/min), and stirring for 15 minutes;
step 3, adding 1g of sodium stearate, continuously stirring for 10 minutes, homogenizing for one time at 20MPa by a high-pressure homogenizer, and filtering and discharging by using a 100-mesh screen;
and step 4, cooling to 25 ℃, wherein the weight solid content of the obtained aqueous lubricant is 53.15 wt%, the viscosity is 361mPa & s (measured by an NDJ-1 rotary viscometer), and the pH is 9.05 (measured by a PHS-3C precision pH meter).
The solids content and viscosity index of each example and comparative example are shown in table 1:
TABLE 1 sample Performance index
The experimental data show that the special dispersing agent is added in the synthesis of the lubricant, and after homogenization, the viscosity of the lubricant can be obviously reduced while the solid content of the lubricant is improved, so that the lubricant can be directly added without dilution in the process of applying the lubricant to papermaking coating, and the use convenience is improved.
Application examples
The lubricants prepared in examples 1-4 and comparative examples 1-7 above were formulated into coatings according to the following formulation:
95-grade heavy calcium carbonate 400g
Brazilian china clay 100g
50g of styrene-butadiene latex (dry weight)
Lubricant (dry weight) 2g
And (3) adjusting the weight solid content of the coating to 65% by using a proper amount of deionized water.
The experimental process comprises the following steps:
1) adding 95-grade heavy calcium carbonate, Brazilian china clay and a proper amount of deionized water into a high-speed dispersion machine, uniformly stirring, dispersing at a high speed for 20-30min until the fineness is qualified, adding latex and a lubricant at a low speed, uniformly stirring, discharging, and filtering by using a 100-mesh screen;
2) coatings formulated using examples 1-4 and comparative examples 1-4 were applied using a # 10 coating bar at 75g/m2Coating on the copperplate base paper with the coating weight of 15g/m2And is ready for use;
3) coating calendering conditions: the coated paper sample is taken and hard-calendered twice (0.3Mpa,85 ℃) by a small calender for standby.
The paper is subjected to coating performance test by adopting a national standard method:
and (3) judging standard: the larger the smoothness and gloss, the better the effect.
The results of the measurements are shown in Table 2:
TABLE 2 sample Performance index
From the above application results, it can be seen that: the lubricant prepared by the invention is applied to papermaking coating of coated paper, can obviously improve the smoothness and glossiness of the coated paper, and has good lubricating effect.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The preparation method of the high-solid-content low-viscosity aqueous lubricant is characterized in that the high-solid-content low-viscosity aqueous lubricant is obtained by mixing and reacting the components of glyceryl stearate, isomeric alcohol polyoxyethylene ether, sodium hexametaphosphate, alkali, a dispersing agent and water, wherein the dispersing agent is at least one selected from sodium lignosulfonate, sodium methylene dinaphthalene sulfonate, a melamine-formaldehyde polycondensate and a sodium naphthalenesulfonate-formaldehyde polymer; the weight contents of the components are as follows: 100 parts of glyceryl stearate, 18-50 parts of isomeric alcohol polyoxyethylene ether, 8-30 parts of sodium hexametaphosphate, 3-20 parts of alkali, 0.5-5 parts of dispersing agent and 200 parts of water.
2. The method according to claim 1, comprising in particular the steps of:
step 1, melting glyceryl stearate at 85-95 ℃ for later use;
step 2, uniformly mixing the isomeric alcohol polyoxyethylene ether, sodium hexametaphosphate, alkali and all water, completely dissolving to obtain a kettle bottom material, and heating to 85-95 ℃; adding the molten solution of the glyceryl stearate in the step 1 under high-speed stirring, and uniformly stirring;
step 3, adding a dispersing agent at 85-95 ℃, and uniformly stirring;
and 4, cooling to 20-40 ℃, and adjusting the pH value to 6-10 to prepare the water-based lubricant.
3. The method of claim 1, wherein the base is selected from at least one of diethanolamine, triethanolamine, triethylenediamine, sodium hydroxide, and potassium hydroxide.
4. The method of claim 1, wherein the dispersant is sodium lignosulfonate or sodium methylenedinaphthalene sulfonate.
5. The method of claim 1, wherein the weight content of each component is: 100 parts of glyceryl stearate, 18-22 parts of isomeric alcohol polyoxyethylene ether, 8-12 parts of sodium hexametaphosphate, 3-7 parts of alkali, 0.8-1.2 parts of dispersing agent and 130 parts of water 110-.
6. The method of claim 1, wherein the dispersing agent is added in step 3, and after stirring, the mixture is homogenized by a high-pressure homogenizer.
7. The method of claim 1, wherein the pressure of the high pressure homogenizer in step 3 is 20 to 30 Mpa.
8. A high-solid-content low-viscosity aqueous lubricant prepared by the method of any one of claims 1 to 7.
9. The high-solid low-viscosity aqueous lubricant according to claim 8, wherein the aqueous lubricant has a solids content of 40 to 60% by weight, a viscosity of 50 to 250 mPas at 25 ℃ and a pH of 7 to 10.
10. Use of the high solids, low viscosity aqueous lubricant of claim 9 in a coated paper papermaking coating.
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Citations (6)
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Application publication date: 20210416 |