CN111253527B - Water-resistant moisture-proof sizing agent, preparation method and water-resistant moisture-proof paper - Google Patents
Water-resistant moisture-proof sizing agent, preparation method and water-resistant moisture-proof paper Download PDFInfo
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- CN111253527B CN111253527B CN202010041334.9A CN202010041334A CN111253527B CN 111253527 B CN111253527 B CN 111253527B CN 202010041334 A CN202010041334 A CN 202010041334A CN 111253527 B CN111253527 B CN 111253527B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F275/00—Macromolecular compounds obtained by polymerising monomers on to polymers of monomers containing phosphorus, selenium, tellurium or a metal as defined in group C08F30/00
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/22—Emulsion polymerisation
- C08F2/24—Emulsion polymerisation with the aid of emulsifying agents
- C08F2/26—Emulsion polymerisation with the aid of emulsifying agents anionic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/22—Emulsion polymerisation
- C08F2/24—Emulsion polymerisation with the aid of emulsifying agents
- C08F2/30—Emulsion polymerisation with the aid of emulsifying agents non-ionic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/10—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polymers containing more than one epoxy radical per molecule
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
Abstract
The invention relates to the technical field of paper production, in particular to a water-resistant moisture-proof sizing agent, a preparation method and water-resistant moisture-proof paper, wherein the water-resistant moisture-proof sizing agent comprises the following raw materials in parts by weight: 74-217 parts of mixed monomer, 2-6 parts of emulsifier, 0.1-3 parts of initiator, 0.1-1 part of buffer and 150-160 parts of water; the mixed monomer comprises epoxy resin, organic silicon, an acrylamide monomer, ethylene glycol dimethacrylate, methacrylic acid, hydroxyethyl methacrylate, methyl methacrylate, glycidyl methacrylate, styrene and butyl acrylate. The sizing agent disclosed by the invention has a good effect of improving the water resistance and moisture resistance of paper.
Description
Technical Field
The invention relates to the technical field of paper production, in particular to a water-resistant moisture-proof sizing agent, a preparation method and water-resistant moisture-proof paper.
Background
A large number of capillary pores exist among fibers in paper, cellulose and hemicellulose which form the fibers contain hydrophilic hydroxyl groups and other hydrophilic groups, the cellulose and the hemicellulose can absorb water or other liquid, ink or printing ink can cause writing unclear or print through by permeation and diffusion when the paper made of the fibers is used for writing or printing, and in addition, the strength of the paper is reduced after the paper absorbs water, so that the normal use of the paper can be influenced. The surface of paper is sized to make up a series of problems caused by using a large amount of non-wood fibers and waste paper pulp in the paper making industry, the properties of the paper such as water resistance, oil resistance and the like can be improved, meanwhile, the glossiness, the hydrophobicity, the mechanical strength, the printability and the like are improved, and the paper is endowed with excellent properties.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the first object of the invention is to provide a water-resistant moisture-proof sizing agent which has a good effect of improving the water-resistant moisture-proof performance of paper.
The second purpose of the invention is to provide a preparation method of the water-resistant moisture-proof sizing agent, which has the advantages of simple process steps, short preparation time and strong controllability.
The third purpose of the invention is to provide a water-resistant and moisture-proof paper.
The first purpose of the invention is realized by the following technical scheme:
a water-resistant moisture-proof sizing agent comprises the following raw materials in parts by weight:
the mixed monomer comprises epoxy resin, organic silicon, an acrylamide monomer, ethylene glycol dimethacrylate, methacrylic acid, hydroxyethyl methacrylate, methyl methacrylate, glycidyl methacrylate, styrene and butyl acrylate.
Because the epoxy resin contains a large amount of polar groups such as hydroxyl, epoxy group, ether bond and the like, the epoxy resin can generate cross-linking reaction with corresponding groups or form hydrogen bond and electrostatic adsorption, so that the performance of paper can be greatly improved; meanwhile, due to the epoxy groups contained at the two ends of the epoxy resin and the high-polarity characteristics of the polymer chain segments, a strong net structure can be established among fibers, so that the fibers are tightly arranged, meanwhile, the benzene ring and methylene contained in the epoxy resin weaken the hydrophilicity and high crosslinking density of polar groups, and the epoxy resin has excellent protection on water molecules, so that the sizing agent containing the epoxy resin can provide excellent waterproof and moistureproof performances.
In the organic silicon, si-O has the characteristics of high bond energy, low internal rotation energy, large molecular molar volume, small surface area and the like, so that the organic silicon has excellent hydrophobicity, weather resistance and other properties.
The ethylene glycol dimethacrylate contains two C = C bonds, has excellent crosslinking performance, and can improve the solvent resistance and the friction resistance of paper, and the glycidyl methacrylate contains an epoxy group and can also greatly improve the performance of the paper.
The invention compounds the substances, so that the prepared sizing agent has greatly improved water resistance, moisture resistance and mechanical properties on paper.
Wherein the mixed monomer comprises, by weight, 1-10 parts of epoxy resin, 0.1-5 parts of organic silicon, 1-5 parts of acrylamide monomers, 0.1-1 part of ethylene glycol dimethacrylate, 1-10 parts of methacrylic acid, 10-30 parts of hydroxyethyl methacrylate, 10-40 parts of methyl methacrylate, 0.5-3 parts of glycidyl methacrylate, 30-60 parts of styrene and 20-50 parts of butyl acrylate.
Wherein the organosilicon comprises at least one of methacryloxypropyltrimethoxysilane, vinyl triisopropoxysilane, vinyl trimethylsiloxane and vinyl triethoxysilane.
Wherein the acrylamide monomer comprises at least one of acrylamide, N-dimethylacrylamide and N-hydroxymethyl acrylamide.
Wherein the epoxy resin comprises at least one of bisphenol A type epoxy resin or bisphenol F type epoxy resin, and preferably, the epoxy resin is bisphenol A type epoxy resin.
Wherein the emulsifier consists of an anionic emulsifier and a nonionic emulsifier;
preferably, the anionic emulsifier comprises at least one of sodium dodecyl benzene sulfonate, sodium dodecyl sulfonate and sodium dodecyl sulfate; the nonionic emulsifier comprises at least one of polyoxyethylene octyl phenol ether-10, fatty alcohol polyoxyethylene ether and alkylphenol polyoxyethylene ether.
Wherein the buffer is sodium bicarbonate buffer.
Wherein the initiator comprises at least one of potassium persulfate, sodium persulfate and ammonium persulfate.
The second purpose of the invention is realized by the following technical scheme:
a preparation method of a water-resistant moisture-proof sizing agent is characterized by comprising the following steps: the method comprises the following steps:
step one, pretreating raw materials, namely respectively taking 1-10 parts of epoxy resin, 0.1-5 parts of organic silicon, 1-5 parts of acrylamide monomer, 0.1-1 part of ethylene glycol dimethacrylate, 1-10 parts of methacrylic acid, 10-30 parts of hydroxyethyl methacrylate, 10-40 parts of methyl methacrylate, 0.5-3 parts of glycidyl methacrylate, 30-60 parts of styrene, 20-50 parts of butyl acrylate, 2-6 parts of emulsifier, 0.1-3 parts of initiator and 0.1-1 part of buffering agent according to parts by weight, mixing and dissolving the emulsifier and water to obtain an emulsifier solution, mixing and dissolving the initiator and water to obtain an initiator solution for later use
Step two, mixing 38% -42% of the emulsifier solution prepared in the step one with organic silicon, part of styrene, part of butyl acrylate and part of methacrylic acid to prepare a nuclear phase pre-emulsion;
step three, adding the buffering agent obtained in the step one into a reaction kettle, adding 70-80 parts by weight of water, heating to 75-85 ℃, adding 8% -12% of the emulsifier solution obtained in the step one into the reaction kettle, adding 15% -25% of the nuclear phase pre-emulsion obtained in the step two into the reaction kettle, finally dropwise adding 15% -25% of the initiator solution obtained in the step one, and preserving heat after dropwise adding is completed to obtain seed emulsion;
step four, dripping 35-45% of initiator solution and the rest nuclear phase pre-emulsion into the reaction kettle in the step three in parallel, and preserving heat for later use after finishing dripping;
step five, dissolving the acrylamide monomer in the step one by water to prepare an acrylamide solution for later use;
step six, uniformly mixing the ethylene glycol dimethacrylate, the hydroxyethyl methacrylate, the methyl methacrylate, the glycidyl methacrylate, the epoxy resin, the residual styrene and the residual butyl acrylate in the step one to prepare a shell phase mixed monomer for later use;
step seven, uniformly mixing the acrylamide solution prepared in the step five with the rest emulsifier solution, and then adding the shell phase mixed monomer prepared in the step six to prepare a shell phase pre-emulsion;
and step eight, parallelly dripping the shell phase pre-emulsion and the rest initiator solution into the reaction kettle in the step three, preserving heat after finishing dripping, finally cooling to below 45 ℃, filtering and discharging.
Wherein, the styrene added in the step two is 30-40% of the total amount of the styrene in the step one, the butyl acrylate added in the step two is 20-40% of the total amount of the butyl acrylate in the step one, and the methacrylic acid added in the step two is 30-40% of the total amount of the methacrylic acid in the step one.
Wherein, in the third step, the dripping time is 8-12min, and the temperature is kept for 15-25min after the dripping is finished.
Wherein, in the fourth step, the dripping time is 1.5 to 2.5 hours, the temperature is kept for 25 to 35min after the dripping is finished, and the temperature during the dripping and the heat-preservation temperature are both controlled between 75 and 85 ℃.
Wherein, in the step eight, the dripping time is 2.5-3.5h, the temperature is kept for 1.5-2.5h after the dripping is finished, and the temperature during dripping and the temperature for keeping the temperature are controlled to be 80-82 ℃.
The third purpose of the invention is realized by the following technical scheme:
the surface of the water-resistant moisture-proof paper is coated with the water-resistant moisture-proof sizing agent or the water-resistant moisture-proof sizing agent prepared by the preparation method.
The invention has the beneficial effects that:
the water-resistant moisture-proof sizing agent is compounded with other components by adding monomers such as organic silicon, epoxy resin, ethylene glycol dimethacrylate, glycidyl methacrylate and the like, so that the water-resistant moisture-proof performance of paper can be effectively improved by the prepared sizing agent. The epoxy resin and the glycidyl methacrylate contain epoxy groups and can play a good role in resisting water and moisture, and a large number of functional groups contained in the organic silicon, the ethylene glycol dimethacrylate, the hydroxyethyl ester and the acrylamide can achieve a reinforcing effect through a crosslinking reaction; the preparation process is simple, short in time and suitable for industrial production.
Detailed Description
The present invention will be further described with reference to the following examples, which are not intended to limit the scope of the present invention.
The invention provides the components of the water-resistant moisture-proof sizing agent in the embodiments 1-4, and specifically, the water-resistant moisture-proof sizing agent in the embodiments 1-4 comprises the following raw materials in parts by weight:
wherein the mixed monomer comprises the following raw materials in parts by weight: 1-10 parts of epoxy resin, 0.1-5 parts of organic silicon, 1-5 parts of acrylamide monomer, 0.1-1 part of ethylene glycol dimethacrylate, 1-10 parts of methacrylic acid, 10-30 parts of hydroxyethyl methacrylate, 10-40 parts of methyl methacrylate, 0.5-3 parts of glycidyl methacrylate, 30-60 parts of styrene and 20-50 parts of butyl acrylate.
Wherein, organosilicon in the mixed monomer, 30 to 50 percent of styrene, 20 to 40 percent of butyl acrylate and 30 to 40 percent of methacrylic acid form a nuclear phase monomer; and hydroxyethyl methacrylate, acrylamide monomer, ethylene glycol dimethacrylate, glycidyl methacrylate, methyl methacrylate, epoxy resin, residual styrene, residual butyl acrylate and residual methacrylic acid in the mixed monomer form a shell phase monomer.
Wherein the emulsifier is mixed with 45-55 parts by weight of water to form an emulsifier solution, and the initiator is mixed with 25-35 parts by weight of water to form an initiator solution.
Wherein the organosilicon comprises at least one of methacryloxypropyltrimethoxysilane, vinyl triisopropoxysilane, vinyl trimethylsiloxane and vinyl triethoxysilane.
Wherein the acrylamide monomer comprises at least one of acrylamide, N-dimethylacrylamide and N-methylolacrylamide.
Wherein the epoxy resin comprises at least one of bisphenol A type epoxy resin or bisphenol F type epoxy resin, and preferably, the epoxy resin is bisphenol A type epoxy resin.
Wherein the emulsifier consists of an anionic emulsifier and a nonionic emulsifier;
preferably, the anionic emulsifier comprises at least one of sodium dodecyl benzene sulfonate, sodium dodecyl sulfonate and sodium dodecyl sulfate; the nonionic emulsifier comprises at least one of polyoxyethylene octyl phenol ether-10, fatty alcohol-polyoxyethylene ether and alkylphenol polyoxyethylene ether.
Wherein the buffer is sodium bicarbonate buffer.
Wherein the initiator comprises at least one of potassium persulfate, sodium persulfate and ammonium persulfate.
Tables 1-4 show the materials specifically selected for each component and the amounts of each material added in the water and moisture resistant sizing agents of examples 1-4, respectively.
Example 1
Table 1 ingredient table of water-resistant moisture-proof sizing agent of example 1
The preparation method of the water-resistant moisture-proof sizing agent of the embodiment 1 comprises the following steps:
firstly, pretreating raw materials, respectively taking epoxy resin, organic silicon, acrylamide monomers, ethylene glycol dimethacrylate, methacrylic acid, hydroxyethyl methacrylate, methyl methacrylate, glycidyl methacrylate, styrene, butyl acrylate, an emulsifier, an initiator and a buffering agent according to the dosage of each substance, mixing and dissolving the emulsifier and 50g of water to obtain an emulsifier solution, mixing and dissolving the initiator and 30g of water to obtain an initiator solution for later use
Step two, mixing 40% of the emulsifier solution prepared in the step one with a nuclear phase monomer to prepare a nuclear phase pre-emulsion;
step three, adding the buffering agent obtained in the step one into a reaction kettle, adding 75g of water, heating to 80 ℃, adding 10% of the emulsifier solution obtained in the step one into the reaction kettle, then adding 20% of the nuclear phase pre-emulsion obtained in the step two into the reaction kettle, finally dropwise adding 20% of the initiator solution obtained in the step one, and preserving heat after dropwise adding is completed, wherein the dropwise adding time is 10min, and the heat preservation time is 20min, so as to obtain a seed emulsion;
step four, dripping 40% of initiator solution and the rest nuclear phase pre-emulsion into the reaction kettle in the step three in parallel, preserving heat after finishing dripping, wherein the dripping time is 2 hours, preserving heat for 30min after finishing dripping, and keeping the dripping temperature and the heat preservation temperature at 80 ℃ for later use;
step five, dissolving the acrylamide monomer in the step one by using water to prepare an acrylamide solution for later use;
step six, uniformly mixing the ethylene glycol dimethacrylate, the hydroxyethyl methacrylate, the methyl methacrylate, the glycidyl methacrylate, the epoxy resin, the residual styrene and the residual butyl acrylate in the step one to prepare a shell phase mixed monomer for later use;
step seven, uniformly mixing the acrylamide solution prepared in the step five with the rest emulsifier solution, and then adding the shell phase mixed monomer prepared in the step six to prepare a shell phase pre-emulsion;
and step eight, parallelly dripping the shell phase pre-emulsion and the rest initiator solution into the reaction kettle in the step three, preserving heat after finishing dripping, wherein the dripping time is 3 hours and the temperature is 80 ℃, preserving heat for 2 hours after finishing dripping, preserving heat at 81 ℃, finally cooling to below 45 ℃, and filtering and discharging.
Example 2
Table 2 ingredient table of water-resistant moisture-proof sizing agent of example 2
The preparation method of the water-resistant moisture-proof sizing agent of the embodiment 2 is the same as that of the embodiment 1.
Example 3
Table 3 ingredient table of water-resistant moisture-proof sizing agent of example 3
The preparation method of the water-resistant moisture-proof sizing agent in the embodiment 3 is the same as that of the embodiment 1.
Example 4
Table 4 ingredient table of water-resistant moisture-proof sizing agent of example 4
Among them, the preparation method of the water-resistant moisture-proof sizing agent of the embodiment 4 is the same as that of the embodiment 1.
Comparative example
The components and the contents of the components of the sizing agent of the comparative example are shown in table 5. The preparation method of the comparative example is different from the preparation method of example 1 in that hydroxypropyl methacrylate is used in the comparative example to replace hydroxyethyl methacrylate in example 1, and other operating conditions of the comparative example are the same as those of example 1, and are not described herein.
Table 5 ingredient table of water-resistant moisture-proof sizing agent of comparative example
The water and moisture resistant sizing agents prepared in examples 1 to 4 and comparative example were uniformly coated on paper having the same texture and the same coating thickness, and after the sizing agents were dried, the performance of the paper coated with the sizing agents and the performance of the paper not coated with the sizing agents were tested, and the test results are shown in table 6.
TABLE 6 summary of test results
Wherein, the tearing index of the paper is tested by a tearing tester according to the GB/T455 standard, and the folding endurance is tested according to the GB/T457-2008.
The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit of the present invention.
Claims (8)
1. A water-resistant moisture-proof sizing agent is characterized in that: the composite material comprises the following raw materials in parts by weight:
74-217 parts of mixed monomer
2-6 parts of emulsifier
0.1 to 3 portions of initiator
0.1 to 1 portion of buffering agent
150-160 parts of water;
the mixed monomer comprises epoxy resin, organic silicon, an acrylamide monomer, ethylene glycol dimethacrylate, methacrylic acid, hydroxyethyl methacrylate, methyl methacrylate, glycidyl methacrylate, styrene and butyl acrylate;
the weight parts of the mixed monomer are 1-10 parts of epoxy resin, 0.1-5 parts of organic silicon, 1-5 parts of acrylamide monomer, 0.1-1 part of ethylene glycol dimethacrylate, 1-10 parts of methacrylic acid, 10-30 parts of hydroxyethyl methacrylate, 10-40 parts of methyl methacrylate, 0.5-3 parts of glycidyl methacrylate, 30-60 parts of styrene and 20-50 parts of butyl acrylate;
the emulsifier consists of an anionic emulsifier and a nonionic emulsifier;
the emulsifier is an anionic emulsifier and comprises at least one of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate and sodium dodecyl sulfate; the nonionic emulsifier comprises at least one of polyoxyethylene octyl phenol ether-10, fatty alcohol-polyoxyethylene ether and alkylphenol polyoxyethylene ether;
the buffer is sodium bicarbonate buffer;
the organic silicon comprises at least one of methacryloxypropyltrimethoxysilane, vinyl triisopropoxysilane, vinyl trimethylsiloxane and vinyl triethoxysilane;
the preparation method of the water-resistant moisture-proof sizing agent comprises the following steps:
firstly, pretreating raw materials, namely respectively taking 1-10 parts of epoxy resin, 0.1-5 parts of organic silicon, 1-5 parts of acrylamide monomer, 0.1-1 part of ethylene glycol dimethacrylate, 1-10 parts of methacrylic acid, 10-30 parts of hydroxyethyl methacrylate, 10-40 parts of methyl methacrylate, 0.5-3 parts of glycidyl methacrylate, 30-60 parts of styrene, 20-50 parts of butyl acrylate, 2-6 parts of emulsifier, 0.1-3 parts of initiator and 0.1-1 part of buffering agent according to parts by weight, mixing and dissolving the emulsifier and water to form an emulsifier solution, and mixing and dissolving the initiator and water to form an initiator solution for later use;
step two, mixing 38% -42% of the emulsifier solution prepared in the step one with organic silicon, part of styrene, part of butyl acrylate and part of methacrylic acid to prepare a nuclear phase pre-emulsion;
step three, adding the buffering agent obtained in the step one into a reaction kettle, adding 70-80 parts by weight of water, heating to 75-85 ℃, adding 8% -12% of the emulsifier solution obtained in the step one into the reaction kettle, adding 15% -25% of the nuclear phase pre-emulsion obtained in the step two into the reaction kettle, finally dropwise adding 15% -25% of the initiator solution obtained in the step one, and preserving heat after dropwise adding is completed to obtain seed emulsion;
step four, dripping 35-45% of initiator solution and the rest nuclear phase pre-emulsion into the reaction kettle in the step three in parallel, and preserving heat for later use after finishing dripping;
step five, dissolving the acrylamide monomer in the step one by using water to prepare an acrylamide solution for later use;
step six, uniformly mixing the ethylene glycol dimethacrylate, the hydroxyethyl methacrylate, the methyl methacrylate, the glycidyl methacrylate, the epoxy resin, the residual styrene and the residual butyl acrylate in the step one to prepare a shell phase mixed monomer for later use;
step seven, uniformly mixing the acrylamide solution prepared in the step five with the rest emulsifier solution, and then adding the shell phase mixed monomer prepared in the step six to prepare a shell phase pre-emulsion;
step eight, parallelly dripping the shell-phase pre-emulsion and the rest initiator solution into the reaction kettle in the step three, preserving heat after finishing dripping, finally cooling to below 45 ℃, filtering and discharging;
wherein, the styrene added in the step two is 30-40% of the total amount of the styrene in the step one, the butyl acrylate added in the step two is 20-40% of the total amount of the butyl acrylate in the step one, and the methacrylic acid added in the step two is 30-40% of the total amount of the methacrylic acid in the step one.
2. A water-resistant moisture-proof size as defined in claim 1, wherein: the acrylamide monomer comprises at least one of acrylamide, N-dimethylacrylamide and N-methylolacrylamide.
3. A process for preparing a water-resistant moisture-proof size as defined in any one of claims 1-2, wherein: the method comprises the following steps:
firstly, pretreating raw materials, namely respectively taking 1-10 parts of epoxy resin, 0.1-5 parts of organic silicon, 1-5 parts of acrylamide monomer, 0.1-1 part of ethylene glycol dimethacrylate, 1-10 parts of methacrylic acid, 10-30 parts of hydroxyethyl methacrylate, 10-40 parts of methyl methacrylate, 0.5-3 parts of glycidyl methacrylate, 30-60 parts of styrene, 20-50 parts of butyl acrylate, 2-6 parts of emulsifier, 0.1-3 parts of initiator and 0.1-1 part of buffering agent according to parts by weight, mixing and dissolving the emulsifier and water to form an emulsifier solution, and mixing and dissolving the initiator and water to form an initiator solution for later use;
step two, mixing 38% -42% of the emulsifier solution prepared in the step one with organic silicon, part of styrene, part of butyl acrylate and part of methacrylic acid to prepare a nuclear phase pre-emulsion;
step three, adding the buffering agent obtained in the step one into a reaction kettle, adding 70-80 parts by weight of water, heating to 75-85 ℃, adding 8% -12% of the emulsifier solution obtained in the step one into the reaction kettle, adding 15% -25% of the nuclear phase pre-emulsion obtained in the step two into the reaction kettle, finally dropwise adding 15% -25% of the initiator solution obtained in the step one, and preserving heat after dropwise adding is completed to obtain a seed emulsion;
step four, dripping 35-45% of initiator solution and the remaining nuclear phase pre-emulsion into the reaction kettle in the step three in parallel, and preserving heat for later use after finishing dripping;
step five, dissolving the acrylamide monomer in the step one by water to prepare an acrylamide solution for later use;
step six, uniformly mixing the ethylene glycol dimethacrylate, the hydroxyethyl methacrylate, the methyl methacrylate, the glycidyl methacrylate, the epoxy resin, the residual styrene and the residual butyl acrylate in the step one to prepare a shell phase mixed monomer for later use;
step seven, uniformly mixing the acrylamide solution prepared in the step five with the rest emulsifier solution, and then adding the shell phase mixed monomer prepared in the step six to prepare a shell phase pre-emulsion;
and step eight, parallelly dripping the shell phase pre-emulsion and the rest initiator solution into the reaction kettle in the step three, preserving heat after finishing dripping, finally cooling to below 45 ℃, and filtering and discharging.
4. A method of preparing a water-resistant moisture-proof sizing agent according to claim 3, characterized in that: the styrene added in the step two accounts for 30% -40% of the total amount of the styrene in the step one, the butyl acrylate added in the step two accounts for 20% -40% of the total amount of the butyl acrylate in the step one, and the methacrylic acid added in the step two accounts for 30% -40% of the total amount of the methacrylic acid in the step one.
5. A method of preparing a water-resistant moisture-proof sizing agent according to claim 3, characterized in that: in the third step, the dripping time is 8-12min, and the temperature is kept for 15-25min after the dripping is finished.
6. A method of preparing a water-resistant moisture-proof sizing agent according to claim 3, characterized in that: in the fourth step, the dripping time is 1.5-2.5h, the temperature is kept for 25-35min after the dripping is finished, and the temperature during the dripping and the temperature for keeping the temperature are both controlled between 75-85 ℃.
7. A method of preparing a water-resistant moisture-proof sizing agent according to claim 3, characterized in that: in the eighth step, the dripping time is 2.5-3.5h, the heat preservation time is 1.5-2.5h after the dripping is finished, and the temperature during dripping and the heat preservation temperature are controlled to be 80-82 ℃.
8. A water-resistant moisture-proof paper is characterized in that: the surface of the water-resistant moisture-proof paper is coated with the water-resistant moisture-proof sizing agent according to any one of claims 1 to 2 or the water-resistant moisture-proof sizing agent produced by the production method according to any one of claims 3 to 7.
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| CN101210402A (en) * | 2007-12-21 | 2008-07-02 | 陕西科技大学 | Method for preparing water resistance surface sizing agent emulsion |
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| CN103265655A (en) * | 2013-03-15 | 2013-08-28 | 北京印刷学院 | Reactive cationic polyacrylate emulsion and preparation method and application thereof |
| CN104628946A (en) * | 2015-02-13 | 2015-05-20 | 孙高雷 | Dry strength agent for coated paper and preparation method of dry strength agent |
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