CN108716155B - Nonwoven seam paper and preparation method thereof - Google Patents

Abstract

The invention belongs to the technical field of papermaking, and in particular relates to a non-woven seam paper and a preparation method thereof. The non-woven seam paper is made from the following raw materials by weight: 50-70 parts of bleached sulfate softwood pulp, 30-50 parts of chemical fiber PET, 4-5 parts of wet strength agent PAE, 2-5 parts of dry strength agent, glue 12-18 parts of adhesive and 3-5 parts of adjuvant; the adjuvant consists of dispersant, antioxidant, antifungal agent and defoamer. The non-woven seam paper of the invention has good transverse strength, good paper air permeability, good paper uniformity, high binding force, and the paper has sufficient anti-aging ability and anti-mildew and sterilization performance.

Description

Non-woven seam paper and preparation method thereof

technical field

The invention belongs to the technical field of papermaking, and in particular relates to a non-woven seam paper and a preparation method thereof.

Background technique

Seam tape is used to increase the joint strength of joints, corners or repair cracks or holes. Seam tape products mainly include pre-creased seam paper tape, cloth tape and glass fiber seam tape. However, the paper tape is stronger than the glass fiber seam tape, it is not easy to be torn by the caulking tool, and it is resistant to stretching and wrinkling. Therefore, paper tape has advantages over glass fiber. Although the cloth tape itself has high tensile strength, its joint system has poor tensile performance due to poor bonding with the joint compound. Paper tape for inside corners is easier to keep the seam tape centered and straight than glass fiber seam tape, and the paper bag has low cost, easy degradation and less pollution. Because the surface of the seam paper tape is roughened and the air holes are randomly distributed, it helps to remove air bubbles when seaming, and is more closely combined with the joint filler. Some paper tapes on the market have low strength or insufficient water resistance or poor air permeability, which affects the decoration effect.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a kind of non-woven seam paper, which has good transverse strength, good air permeability, good paper evenness, high bonding force, and paper has sufficient anti-aging ability and anti-mildew and sterilization performance; the present invention also provides The preparation method of the non-woven seam paper is scientific, reasonable and simple.

The non-woven seam paper of the present invention is made of the following raw materials by weight:

The auxiliary agent is composed of dispersant, antioxidant, antifungal agent and defoamer, and the mass ratio of dispersant, antioxidant, antifungal agent and antifoaming agent is 1:1:1:1.

The length of the chemical fiber PET is 3.5-5cm.

The dry strength agent is one or more of cationic starch, polyacrylamide or glyoxal polyacrylamide.

The adhesive is one or more of phenolic epoxy acrylic resin adhesive, melamine formaldehyde resin or polyvinyl alcohol.

The dispersing agent is one or more of an aqueous solution of polycarboxylate ammonia salt, an aqueous solution of anionic sodium salt of polyacrylic acid, or an acidic group-containing copolymer xylene solution.

The antioxidant is one or more of dibutylhydroxytoluene, butylhydroxyanisole or tert-butylhydroquinone.

The antifungal agent is an isothiazolinone derivative, and the defoaming agent is polydimethylsiloxane.

The preparation method of the non-woven seam paper of the present invention, the steps are as follows:

(1) The chemical fiber PET and bleached kraft softwood pulp are mixed and put into a beating machine to add water to dilute the beating, and the beating degree is 23-27°SR;

(2) Mix the material obtained in step (1) with wet strength agent PAE, dispersant, defoamer, dry strength agent, antioxidant and antifungal agent, and stir and mix for 1-2 hours to obtain a mixed slurry. The material is made and dried by an inclined mesh paper machine to obtain semi-finished base paper;

(3) drop part of the sizing agent into water that is 3 times its weight, stir to make it completely mixed to obtain a sizing solution, and then the sizing solution is sizing on the semi-finished base paper obtained in step (2) through a sizing machine, After drying in a drying box, the base paper after sizing is obtained;

(4) put the remaining sizing agent into 1.5 times its weight of water, stir to make it completely mixed to obtain a surface coating liquid, and then apply the surface coating liquid to the base paper after sizing obtained in step (3) The surface is then dried, surface calendered, and rolled to obtain the base paper into paper.

In step (3), the adhesive contains at least polyvinyl alcohol, and the mass ratio of the adhesive in step (3) to the adhesive in step (4) is 10-15:2-3.

The calendering temperature in step (4) is 150-200°C.

The preparation method of the non-woven seam paper of the present invention, the specific steps are as follows:

(1) Pulping: Add bleached kraft softwood pulp into the hydraulic pulper to fully disintegrate to a concentration of 5%, and then pump it into the pulping tank for use.

(2) Refining: The disintegrated softwood pulp is cut and spun to the required degree of beating by using a refiner and a large-taper decomposing machine.

(3) Chemical fiber PET treatment: The required chemical fiber PET is produced by melt spinning technology, and the length is controlled at 3.5-5cm, which is 1-3cm longer than normal PET products.

(4) Filling: add the pulp after beating, then add PET fiber, then add wet strength agent PAE (polyamide polyamine epichlorohydrin) and dispersant, so that the pulp has a certain wet strength and dispersity . After adding defoamer, dry strength agent, antioxidant and antifungal agent, stir and mix to obtain pulp;

(5) Paper making: The pulp is put on the Internet at a concentration of 0.2‰, and goes through the wire section, pressing section, coating section, drying section and other processes to form semi-finished paper sheets, and then go through sizing, calendering, rolling and other processes. into paper. Among them, the calendering is performed by using a heat-conducting oil calender, and the calendering temperature is controlled at 150-200°C.

The process route is as follows:

Pulping → beating → mixing and filling → pulping in the chemical pulping section → pulp stabilization box → slag remover → headbox → inclined wire section → pressing section → drying section → sizing machine → oven → coating machine → oven → Calender → reel → rewinder → packaging.

The product of the invention has the properties of good air permeability, high transverse strength, tear resistance, aging resistance, mildew resistance and sterilization. After calendering, the chemical fiber PET and melamine formaldehyde resin or phenolic epoxy acrylic resin adhesive are hot-melted and spread in the paper, and the cross-linking agent PVA is introduced to change the intermolecular structure from a linear structure to a network structure. It provides a certain degree of air permeability, and greatly improves the bonding force between paper molecules, laying the foundation for the production of high-quality strong crack-resistant seam paper.

The paper of the invention is used for the treatment of splicing seams, inside corners and outside corners, and solves the problem of cracking of the splicing seams. At the same time, the product has lower raw material cost than glass fiber seam tape, is not easy to be torn by caulking tools, is resistant to stretching and folds, is environmentally friendly and degradable, and has a good decorative effect.

The main features of the product of the invention are high transverse strength, high air permeability, environmental protection and low carbon, which solves the problem of cracking of splicing seams between gypsum boards. It not only ensures good air permeability, but also avoids layering; it does not have low strength, which affects the effect of stitching.

The invention adopts high-quality bleached wood pulp, super-long chemical fiber PET and adhesive as the main raw materials, and uses an inclined mesh paper machine for papermaking and a calender for hot melting.

In the present invention, the super-long PET fibers are added into the pulp, and when pasting, the fine plush is embedded in the adhesive, which increases the cohesive force and cross-links, and improves the strength of the finished paper on the basis of its own strength. In addition, the ultra-long PET fibers also increase the air permeability of the paper. The paper is treated with melamine formaldehyde resin or phenolic epoxy acrylic resin adhesive, which can make the paper obtain strength and hydrophobicity after sizing, and play a waterproof role. A heat-conducting oil calender is used to calender the paper, and the temperature is controlled so that the PET fiber, melamine formaldehyde resin or phenolic epoxy acrylic resin adhesive can be melted and melted in the paper without sticking to the roller. The added cross-linking agent PVA can cross-link the intermolecular linear structure to form a network structure and improve the strength of the paper. In order to improve the aging resistance and anti-fungal and bactericidal properties of the paper, antioxidants and anti-fungal agents are added in the pulp and the sizing agent.

At present, there are several types of wire meshes in papermaking technology, such as oblique wire mesh, fourdrinier wire mesh, stacked wire mesh, sandwich wire mesh, and rotary wire mesh. , good air permeability, high glue absorption, and the produced paper has good air permeability and high strength.

Practice has proved that the process of the invention is simple to operate, easy to control, stable in product quality, saves a lot of manpower and material resources, optimizes the product production process, improves product quality, and is more able to adapt to the production requirements of users, and the production technology and technical level reach the international advanced level. .

Main performance indicators: (JC/T 2076-2011 seam paper tape)

1) Width: 50.0±3mm

2) Transverse tensile strength: ≥4.0N/mm

3) Thickness: ≤0.3mm

4) Wet expansion rate: longitudinal ≤ 0.4%; transverse ≤ 2.5%

5) Bonding strength: ≥0.30MPa

Compared with the prior art, the present invention has the following beneficial effects:

1. Good lateral strength, high dry and wet tensile force and low wet deformation, double-sided roughening, and the minimum fiber adhesion is not less than 52% of the index;

2. The paper has good air permeability, which can effectively prevent peeling and layering;

3. The paper has good uniformity, high bonding force, good tear resistance and stiffness, and is easy to form;

4. The paper has sufficient anti-aging ability and anti-mildew and bactericidal properties, and the formed product can be used well without causing secondary pollution.

Detailed ways

The present invention will be further described below in conjunction with the embodiments.

Example 1

The composition of raw materials is as follows:

The auxiliary agent is composed of dispersant, antioxidant, antifungal agent and defoamer, and the mass ratio of dispersant, antioxidant, antifungal agent and antifoaming agent is 1:1:1:1.

The length of chemical fiber PET is 3.5cm.

The dry strength agent is cationic starch.

The dispersant is an aqueous solution of polycarboxylate ammonium salt.

The antioxidant is dibutylhydroxytoluene.

The antifungal agent is an isothiazolinone derivative.

The defoamer is polydimethylsiloxane.

The preparation method is as follows:

(1) The chemical fiber PET and bleached kraft softwood pulp are mixed and put into a beating machine to add water to dilute the beating, and the beating degree is 23°SR;

(2) Mix the material obtained in step (1) with wet strength agent PAE, dispersant, defoaming agent, dry strength agent, antioxidant and antifungal agent, and stir and mix for 1.2 hours to obtain a mixed slurry. The semi-finished base paper is obtained by making and drying on an inclined mesh paper machine;

(3) drop part of the sizing agent into water that is 3 times its weight, stir to make it completely mixed to obtain a sizing solution, and then the sizing solution is sizing on the semi-finished base paper obtained in step (2) through a sizing machine, After drying in a drying box, the base paper after sizing is obtained;

(4) put the remaining sizing agent into 1.5 times of its weight in water, stir to make it completely mixed to obtain a surface coating liquid, and then apply the surface coating liquid to the base paper after sizing obtained in step (3) The surface is then dried, surface calendered, and rolled to obtain base paper into paper.

In step (3), the adhesive is polyvinyl alcohol.

In step (4), the adhesive is a novolac epoxy acrylic resin adhesive.

The mass ratio of the adhesive in the step (3) to the adhesive in the step (4) is 10:2.

The calendering temperature in step (4) is 150°C.

The performance indicators of the finished paper are:

(1) Width: 50mm;

(2) Transverse tensile strength: 4.5N/mm;

(3) Thickness: 0.2mm;

(4) Wet expansion rate: 0.38% in longitudinal direction; 2.3% in transverse direction;

(5) Bonding strength: 0.35MPa

Example 2

The composition of raw materials is as follows:

The auxiliary agent is composed of dispersant, antioxidant, antifungal agent and defoamer, and the mass ratio of dispersant, antioxidant, antifungal agent and antifoaming agent is 1:1:1:1.

The length of chemical fiber PET is 5cm.

The dry strength agent is polyacrylamide.

The dispersant is an anionic sodium polyacrylate aqueous solution.

The antioxidant is butylated hydroxyanisole.

The antifungal agent is an isothiazolinone derivative.

The defoamer is polydimethylsiloxane.

The preparation method is as follows:

(1) The chemical fiber PET and bleached kraft softwood pulp are mixed and put into a beating machine to add water to dilute the beating, and the beating degree is 27°SR;

(2) Mix the material obtained in step (1) with wet strength agent PAE, dispersant, defoamer, dry strength agent, antioxidant and antifungal agent, and after stirring and mixing for 1 hour, a mixed slurry is obtained, and the mixed slurry is subjected to The slanted mesh paper machine is made and dried to obtain semi-finished base paper;

(3) drop part of the sizing agent into water that is 3 times its weight, stir to make it completely mixed to obtain a sizing solution, and then the sizing solution is sizing on the semi-finished base paper obtained in step (2) through a sizing machine, After drying in a drying box, the base paper after sizing is obtained;

(4) put the remaining sizing agent into 1.5 times of its weight in water, stir to make it completely mixed to obtain a surface coating liquid, and then apply the surface coating liquid to the base paper after sizing obtained in step (3) The surface is then dried, surface calendered, and rolled to obtain base paper into paper.

In step (3), the adhesive is a mixture of melamine formaldehyde resin and polyvinyl alcohol.

In step (4), the adhesive is a mixture of melamine formaldehyde resin and polyvinyl alcohol.

The mass ratio of the adhesive in the step (3) to the adhesive in the step (4) is 15:3.

The calendering temperature in step (4) is 200°C.

The performance indicators of the finished paper are:

(1) Width: 50mm;

(2) Transverse tensile strength: 6.5N/mm;

(3) Thickness: 0.2mm;

(4) Wet expansion rate: 0.2% in longitudinal direction; 1.3% in transverse direction;

(5) Bonding strength: 0.60MPa

Example 3

The composition of raw materials is as follows:

The auxiliary agent is composed of dispersant, antioxidant, antifungal agent and defoamer, and the mass ratio of dispersant, antioxidant, antifungal agent and antifoaming agent is 1:1:1:1.

The length of chemical fiber PET is 4cm.

The dry strength agent is a mixture of cationic starch and glyoxal polyacrylamide.

The dispersant is a mixture of an aqueous polycarboxylate ammonia salt solution and an acidic group-containing copolymer xylene solution.

The antioxidant is tert-butyl hydroquinone.

The antifungal agent is an isothiazolinone derivative.

The defoamer is polydimethylsiloxane.

The preparation method is as follows:

(1) The chemical fiber PET and bleached kraft softwood pulp are mixed and put into a beating machine to add water to dilute the beating, and the beating degree is 25°SR;

(2) Mix the material obtained in step (1) with wet strength agent PAE, dispersant, antifoaming agent, dry strength agent, antioxidant and antifungal agent, and after stirring and mixing for 2 hours, a mixed slurry is obtained, and the mixed slurry is subjected to The slanted mesh paper machine is made and dried to obtain semi-finished base paper;

(3) drop part of the sizing agent into water that is 3 times its weight, stir to make it completely mixed to obtain a sizing solution, and then the sizing solution is sizing on the semi-finished base paper obtained in step (2) through a sizing machine, After drying in a drying box, the base paper after sizing is obtained;

(4) put the remaining sizing agent into 1.5 times of its weight in water, stir to make it completely mixed to obtain a surface coating liquid, and then apply the surface coating liquid to the base paper after sizing obtained in step (3) The surface is then dried, surface calendered, and rolled to obtain base paper into paper.

In step (3), the adhesive is a mixture of phenolic epoxy acrylic resin adhesive and polyvinyl alcohol.

In step (4), the adhesive is a mixture of phenolic epoxy acrylic resin adhesive and melamine formaldehyde resin.

The mass ratio of the adhesive in the step (3) to the adhesive in the step (4) is 12:2.

The calendering temperature in step (4) is 180°C.

The performance indicators of the finished paper are:

(1) Width: 50mm;

(2) Transverse tensile strength: 5.5N/mm;

(3) Thickness: 0.25mm;

(4) Wet expansion rate: 0.3% in longitudinal direction; 1.8% in transverse direction;

(5) Bonding strength: 0.50MPa

Claims (6)

1. The non-woven seam paper is characterized by being prepared from the following raw materials in parts by weight:

the auxiliary agent consists of a dispersing agent, an antioxidant, a mildew preventive and a defoaming agent, wherein the mass ratio of the dispersing agent to the antioxidant to the mildew preventive to the defoaming agent is 1:1:1: 1;

the length of the chemical fiber PET is 3.5-5 cm;

the adhesive is at least one of novolac epoxy acrylic resin adhesive, melamine formaldehyde resin and polyvinyl alcohol;

the preparation method of the non-woven seam paper comprises the following steps:

(1) mixing chemical fiber PET and bleached sulfate softwood pulp, putting the mixture into a beater, adding water for dilution and beating, wherein the beating degree is 23-27 DEG SR;

(2) mixing the material obtained in the step (1) with a wet strength agent PAE, a dispersing agent, a defoaming agent, a dry strength agent, an antioxidant and a mildew preventive, stirring and mixing for 1-2h to obtain mixed slurry, and papermaking and drying the mixed slurry by using an inclined wire paper machine to obtain semi-finished base paper;

(3) putting part of the adhesive into water with the weight 3 times that of the adhesive, stirring to completely and uniformly mix the part of the adhesive with the water to obtain a sizing solution, then sizing the sizing solution on the semi-finished base paper obtained in the step (2) through the sizing machine, and drying through a drying box to obtain sized base paper;

(4) adding the residual adhesive into water with the weight 1.5 times of that of the adhesive, stirring to completely and uniformly mix the residual adhesive and the water to obtain a surface coating liquid, then coating the surface coating liquid on the surface of the sized base paper obtained in the step (3), and drying, surface press polishing and finishing and reeling to obtain base paper finished paper;

the adhesive in the step (3) at least contains polyvinyl alcohol, and the mass ratio of the adhesive in the step (3) to the adhesive in the step (4) is 10-15: 2-3.

2. The nonwoven seam paper of claim 1, wherein the dry strength agent is one or more of cationic starch, polyacrylamide or glyoxal polyacrylamide.

3. The nonwoven seam paper of claim 1, wherein the dispersant is one or more of an aqueous solution of an ammonium salt of a polycarboxylic acid, an aqueous solution of a sodium salt of an anionic polyacrylic acid, or a xylene solution of an acidic group-containing copolymer.

4. The nonwoven seam paper of claim 1, wherein the antioxidant is one or more of butylated hydroxytoluene, butylated hydroxyanisole, and tert-butylhydroquinone.

5. The nonwoven seam paper of claim 1, wherein the mold inhibitor is an isothiazolinone derivative and the defoamer is polydimethylsiloxane.

6. The nonwoven seam paper according to claim 1, characterized in that the calendering temperature in step (4) is 150-200 ℃.