阅读说明：本技术 一种复合助留剂及其制备方法和用途 (Composite retention aid and preparation method and application thereof ) 是由 陈玖玖 童筠 于 2020-12-09 设计创作，主要内容包括：本发明公开了一种复合助留剂及其制备方法和用途,包括如下重量份的原料：高白度粘土矿物6-8份、碳酸钠或碳酸锂0.3-0.6份、高离子度低分子量阴离子聚丙烯酰胺0.5-1.5份、硅酸镁盐或硅酸铝盐1-3份。本发明复合助留剂的优点如下：降低白水浓度,稳定湿部系统,助留提高而降低纸浆的用量,节约成本。助滤提高,有利于提高车速,节约蒸汽单耗。节能。匀度提高,改善成纸品质。改良纸张的印刷性能。对胶粘物的吸附和抑制,有利于改善湿部清洁。清洁生产。环保。延长成形网等易耗品的使用周期,改善机器运行的稳定性。(The invention discloses a composite retention aid and a preparation method and application thereof, wherein the composite retention aid comprises the following raw materials in parts by weight: 6-8 parts of high-whiteness clay mineral, 0.3-0.6 part of sodium carbonate or lithium carbonate, 0.5-1.5 parts of high-ionicity low-molecular-weight anionic polyacrylamide and 1-3 parts of magnesium silicate salt or aluminum silicate salt. The composite retention aid has the following advantages: the concentration of white water is reduced, a wet end system is stabilized, retention is improved, the use amount of paper pulp is reduced, and cost is saved. The filter aid is improved, the speed of the vehicle is improved, and the unit consumption of steam is saved. Energy is saved. The evenness is improved, and the quality of finished paper is improved. Improve the printing performance of the paper. Adsorption and inhibition of stickies is beneficial to improving wet end cleaning. And (5) cleaning production. Is environment-friendly. The service cycle of consumable articles such as forming wire is prolonged, and the running stability of the machine is improved.)

1. A composite retention aid comprises the following raw materials in parts by weight: 6-8 parts of high-whiteness clay mineral, 0.3-0.6 part of sodium carbonate or lithium carbonate, 0.5-1.5 parts of high-ionicity low-molecular-weight anionic polyacrylamide and 1-3 parts of magnesium silicate salt or aluminum silicate salt.

2. A composite retention aid according to claim 1, characterized in that: the feed is prepared from the following raw materials in parts by weight: 6.5 parts of high-whiteness clay mineral, 0.5 part of sodium carbonate or lithium carbonate, 1 part of high-ionicity low-molecular-weight anionic polyacrylamide and 2 parts of magnesium silicate salt or aluminum silicate salt.

3. A composite retention aid according to claim 1, characterized in that: the high-whiteness clay mineral adopts diatomite or bentonite, and the molecular weight of the high-ionicity low-molecular-weight anionic polyacrylamide is less than or equal to 600 ten thousand.

4. A process for preparing the composite retention aid according to claim 1, 2 or 3, comprising the steps of: step 1): crushing and sieving the clay mineral, pulping according to the weight ratio of the clay mineral to water of 2:8, sieving the obtained slurry, settling and drying to obtain purified clay mineral;

step 2): adding sodium carbonate or lithium carbonate into the purified clay mineral, extruding twice by a roller, adding anionic polyacrylamide with high ionic degree and low molecular weight, magnesium silicate salt or aluminum silicate salt for compounding, and then crushing and sieving to finally obtain the composite retention aid.

5. Use of the composite retention aid of claim 1 or 2 or 3 in the preparation of decorative base paper.

Technical Field

The application belongs to the field of retention aids for decorative base paper, and particularly relates to a composite retention aid and a preparation method and application thereof.

Background

The decorative base paper is an indispensable material for the decoration of many building material products in modern life. Such as low-pressure board, high-pressure board, fire-proof board and floor board, etc. for furniture and cupboard, it is placed under the surface paper in the product structure, and mainly possesses the decorative action for providing pattern and covering action for preventing bottom layer glue liquor from leaking out. So that the paper is required to have good hiding power, impregnation property and printing property. With the continuous improvement of the requirements of people on living environment and working environment, the consumption of decorative base paper is continuously increased, the quality is continuously improved, the varieties of the patterns are increasingly rich, and the requirements are also increasingly high. The main process for producing the decorative base paper takes high-quality wood pulp fiber and titanium dioxide as main fillers. Titanium dioxide is fine and wear-resistant, and at present, retention and drainage are mainly performed by using a traditional wet strength agent, so that the first-pass retention rate is low, the uniformity is poor, and the dehydration speed is slow; in addition, the flocculation of titanium dioxide and fiber is easily generated in the production process, and the uniformity and the coverage rate of the product are influenced, so that the printing performance of patterns is poor, and the bottom layer glue solution is easy to leak. The problems of large process adjustment fluctuation, poor stability and the like exist in production.

Disclosure of Invention

Aiming at the problems in the prior art, the application provides a composite retention aid for decorative base paper.

A composite retention aid comprises the following raw materials in parts by weight: 6-8 parts of high-whiteness clay mineral (such as diatomite or bentonite), 0.3-0.6 part of sodium carbonate or lithium carbonate, 0.5-1.5 parts of high-ionic low-molecular-weight anionic polyacrylamide (molecular weight is less than or equal to 600 ten thousand) and 1-3 parts of magnesium silicate salt or aluminum silicate salt.

After the composite retention aid is used, the production process has the advantages of improved stability, good retention rate, reduced production cost, good product uniformity, smooth surface and good absorbability and adaptability. The printing chromaticity is uniform, the stripes are clear, the color is bright, and the glue is not easy to penetrate.

Preferably, the composite retention aid is prepared from the following raw materials in parts by weight: 6.5 parts of high-whiteness clay mineral (diatomite or bentonite), 0.5 part of sodium carbonate or lithium carbonate, 1 part of high-ionic low-molecular-weight anionic polyacrylamide and 2 parts of magnesium silicate salt or aluminum silicate salt.

Preferably, the composite retention aid is prepared from the following raw materials in parts by weight: 6.5 parts of high-whiteness clay mineral (diatomite or bentonite), 0.5 part of lithium carbonate, 1 part of high-ionic low-molecular-weight anionic polyacrylamide and 2 parts of magnesium silicate.

Preferably, the high-whiteness clay mineral adopts diatomite or bentonite, and the molecular weight of the high-ionicity low-molecular-weight anionic polyacrylamide is less than or equal to 600 ten thousand.

The present invention is described in detail below:

the invention selects a clay mineral with high whiteness, high interlayer charge density and exchangeable charges as a main raw material, and after purification, 1, hydrophilic anionic polyacrylamide with high ionic degree and low molecular weight is grafted; 2. monovalent ions Na and Li with smaller ionic radius are used for carrying out interlayer charge exchange to vacate charge capacity; 3. magnesium silicate and aluminum silicate with many micropores are added to increase the cavity. The composite retention aid thus obtained has great interlayer distance, strong charge balancing capacity, many micropores and strong adsorption capacity. These properties are satisfactory for wet end forming and charge balancing in the making of specialty papers.

During the formation of clay mineral (such as diatomite or bentonite), isomorphous substitution usually occurs, and excessive negative charges exist between crystal structure layers, so that charge neutrality can be maintained by electrostatic adsorption of cations (positive charges in wet strength agent). In addition, the clay mineral with high surface area is utilized, and the huge surface area is accompanied with huge surface energy, so that the clay mineral has huge adsorption capacity, and is an ideal auxiliary agent for adsorbing fine fibers and titanium dioxide. The invention treats and micro-organizes the surface of the natural clay, so that the natural clay is hydrophilic and oleophilic, and the efficiency of the natural clay is effectively improved.

The special composite retention aid for the decorative base paper has the advantages that the interlayer distance is increased, the specific surface area is increased, and the number of micropores is large through special treatment. Has good effect on the adsorption of the titanium dioxide in the decorative base paper. The effect is mainly achieved through the following two aspects:

1. the specific surface area of the clay mineral is increased through filling exchange of a large amount of low-valence cations, and good adsorption effect on particles is formed.

2. Organic groups are grafted on the clay through organic modification of the surface of the clay mineral, so that the paper pulp has good like-nature adsorption effect on organic impurities in paper pulp fibers, such as organic adhesive substances and the like, the viscosity of the paper pulp is effectively reduced, the phenomenon of sticking a net and a roll is reduced, and the aim of cleaning a paper machine is fulfilled.

3. Magnesium silicate salt and aluminum silicate salt which are rich in silicon dioxide are added, and the adsorption and exchange capacities of the porous surface are stronger. Is beneficial to the forming and dehydration of paper and improves the paper formation uniformity. Is beneficial to the gum dipping and printing of the subsequent paper-making process.

The compound retention aid product has five effects

1. And the water-soluble organic acid water.

2. By adding the composite retention aid, the ash content of paper is improved by retention, the retention rate of filler is improved, and the cost of paper pulp consumption per ton is reduced.

3. By adding the composite retention aid, the printing performance of the paper can be improved due to strong adsorption.

4. The composite retention aid and the wet strength agent are fully combined in the production process, so that the wet strength of the paper is increased; the filter aid improves the press dryness of the paper, improves the performance of the paper machine to a certain extent, reduces the power consumption and the steam consumption of the paper machine, further improves the speed of the paper machine, increases the yield of the paper machine and ensures that the running efficiency of the paper machine is stably improved.

5. Clean production and prolongs the service life of consumable articles such as forming nets and the like.

The composite retention and filtration aid product special for the decorative base paper is a product which is specially researched and developed according to the production characteristics of the decorative base paper, namely, is sensitive to the charge requirement of a wet-end system, and solves the problems of low retention rate, unclean system, poor production stability and the like in the production of titanium dioxide by using the decorative base paper; is very suitable for the production of decorative base paper.

The composite retention aid has the following advantages:

the concentration of white water is reduced, a wet end system is stabilized, retention is improved, the use amount of paper pulp is reduced, and cost is saved.

The filter aid is improved, the speed of the vehicle is improved, and the unit consumption of steam is saved. Energy is saved.

The evenness is improved, and the quality of finished paper is improved. Improve the printing performance of the paper.

Adsorption and inhibition of stickies is beneficial to improving wet end cleaning. And (5) cleaning production. Is environment-friendly. The service cycle of consumable articles such as forming wire is prolonged, and the running stability of the machine is improved.

1. Formulation examples

Formulation example one:

purified bentonite 6.0 parts

Na₂CO₃0.5 portion

1 part of high-ionicity low-molecular-weight anionic polyacrylamide

2 parts of magnesium silicate

And (3) purifying the bentonite: na (Na)₂CO₃: high ionic low molecular weight anionic polyacrylamide: magnesium silicate salt 6.0: 0.5: 1:2

Formulation example two:

purified diatomite 7 parts

Li₂CO₃0.3 part

0.5 part of high-ionicity low-molecular-weight anionic polyacrylamide

Magnesium silicate 1 part

Purified diatomite: li₂CO₃: high ionic low molecular weight anionic polyacrylamide: magnesium silicate salt 7: 0.3: 0.5:1

Formulation example three:

purified diatomite 8 parts

Na₂CO₃0.6 part

1.5 parts of high-ionicity low-molecular-weight anionic polyacrylamide

Aluminum silicate salt 3 parts

Formulation example four:

purified bentonite 8 parts

Na₂CO₃0.4 portion of

High ionic low molecular weight anionic polyacrylamide 1

Aluminum silicate salt 3 parts

Formulation example five

Purified bentonite 6.5 parts

Li₂CO₃0.5 portion

High ionic low molecular weight anionic polyacrylamide 1

2 parts of magnesium silicate

Drawings

Figure 1 is a flow chart of the preparation of the composite retention aid,

FIG. 2 is a comparative experimental graph of drainability;

FIG. 3 is a graph of a comparative experiment of retention aid effect;

FIG. 4 is a graph of air permeability contrast experiment of finished paper.

Detailed Description

The present application is further described below:

example 1

A composite retention aid prepared by the following steps: step 1): crushing bentonite and sieving the crushed bentonite with a 60-mesh sieve; pulping according to the proportion of bentonite to water of 2:8 (weight parts), soaking for 2 hours, screening the pulp by a 80-mesh screen, removing impurities, settling the pulp, and drying to obtain purified bentonite for later use;

step 2): adding 0.5 part of Na into 6.0 parts of purified bentonite₂CO₃Extruding the rod twice; then adding 1.0 part of high-ionicity low-molecular-weight anionic polyacrylamide (molecular weight 400 ten thousand) and 2.0 parts of magnesium silicate salt for compounding to obtain a semi-finished product;

step 3): and crushing the compounded semi-finished product and sieving the crushed semi-finished product with a 325-mesh sieve to obtain the composite retention aid.

Example 2

A composite retention aid prepared by the following steps: step 1): crushing diatomite and sieving the crushed diatomite by a 60-mesh sieve; pulping according to the proportion of diatomite to water of 2:8 (weight parts), soaking for 2 hours, then screening the pulp by a 80-mesh filter screen, removing impurities, settling the pulp, and drying to obtain purified diatomite for later use;

step 2): 7 parts of purified diatomaceous earth were taken and 0.3 part of Li was added thereto₂CO₃Extruding the rod twice; then adding 0.5 part of high-ionicity low-molecular-weight anionic polyacrylamide (molecular weight is 500 ten thousand) and 1 part of magnesium silicate salt for compounding to obtain a semi-finished product;

step 3): and crushing the compounded semi-finished product and sieving the crushed semi-finished product with a 325-mesh sieve to obtain the composite retention aid.

Example 3

A composite retention aid prepared by the following steps: step 1): crushing diatomite and sieving the crushed diatomite by a 60-mesh sieve; according to the weight ratio of diatomite to water 2:8 (weight portion ratio), soaking for 2 hours, screening the slurry through a 80-mesh screen, removing impurities, settling and drying the slurry to obtain purified diatomite for later use;

step 2): to 8 parts of purified diatomaceous earth, 0.6 part of Na was added₂CO₃Extruding the rod twice; then adding 1.5 parts of high-ionicity low-molecular-weight anionic polyacrylamide (molecular weight is 300 ten thousand) and 3 parts of aluminum silicate salt for compounding to obtain a semi-finished product;

step 3): and crushing the compounded semi-finished product and sieving the crushed semi-finished product with a 325-mesh sieve to obtain the composite retention aid.

Example 4

A composite retention aid prepared by the following steps: step 1): crushing bentonite and sieving the crushed bentonite with a 60-mesh sieve; pulping according to the proportion of 2:8 (parts by weight) of bentonite and water, soaking for 2 hours, screening the pulp by a 80-mesh screen, removing impurities, settling the pulp, and drying to obtain purified bentonite for later use;

step 2): adding 0.4 part of Na into 8 parts of purified bentonite₂CO₃Extruding the rod twice; adding 1 part of high-ionic low-molecular-weight anionic polyacrylamide (molecular weight is 600 ten thousand) and 3 parts of aluminum silicate salt for compounding to obtain a semi-finished product;

step 3): and crushing the compounded semi-finished product and sieving the crushed semi-finished product with a 325-mesh sieve to obtain the composite retention aid.

Example 5

A composite retention aid prepared by the following steps: step 1): crushing the Pengpeng moist soil to 60 meshes; pulping according to the proportion of 2:8 (parts by weight) of bentonite and water, soaking for 2 hours, screening the pulp by a 80-mesh screen, removing impurities, settling the pulp, and drying to obtain purified bentonite for later use;

step 2): adding 0.5 part of lithium carbonate into 6.5 parts of purified Penghui soil, and extruding the rods twice; adding 1 part of high-ionic low-molecular-weight anionic polyacrylamide (molecular weight 500 ten thousand) and 2 parts of magnesium silicate salt for compounding to obtain a semi-finished product;

step 3): and crushing the compounded semi-finished product and sieving the crushed semi-finished product with a 325-mesh sieve to obtain the composite retention aid.

When the composite retention aid prepared in the embodiment is applied to the manufacture of decorative base paper, the addition of the composite retention aid is found to achieve better effects in the aspects of drainage, retention effect and finished paper air permeability:

the composite retention aid prepared in the embodiment 5 of the invention is applied to decorative base paper for performance experiments, and the results are as follows:

2. product effect data comparison

Comparing water filterability, as shown in fig. 2;

as can be seen from fig. 2, in the preparation process of the decorative base paper, the composite retention aid is not added, the steam content per ton paper is 2.3, and after the composite retention aid is added, the steam content per ton paper is reduced and reduced to be unchanged along with the increase of the using amount of the composite retention aid; from fig. 2, it can be seen that the steam consumption can be saved by 0.3-0.5 ton per ton of paper in the preparation process of the decorative base paper.

Therefore, in the preparation process of the decorative base paper, the composite retention aid is added to improve the drainage effect and reduce the steam consumption.

And the retention aid effect is compared: as shown in fig. 3 below

First-pass retention: the first pass retention rate is 60 percent without adding compound retention aid.

With the use of the composite retention aid, the first pass retention rate is increased.

As can be seen from fig. 3, the first pass retention rate of the base decorative paper is 60% without adding the composite retention aid, and the first pass retention rate increases to 80% with the addition of the composite retention aid. Therefore, the composite retention aid is added in the preparation process of the decorative base paper, so that the first pass retention rate of the decorative base paper can be improved, the white water concentration is reduced, a wet end system is stabilized, the use amounts of paper pulp and titanium dioxide are reduced, and the cost is saved.

(3) The finished paper air permeability is shown in fig. 4.

As can be seen from fig. 4, as indicated by line 1, the finished paper prepared without the addition of the composite retention aid had an air permeability of 22; the paper permeability of the paper prepared by adding the composite retention aid (the line 2 in figure 4 is the paper forming test result prepared by adding 5kg of the composite retention aid) is 18; it can be seen that, after the composite retention aid is added, the air permeability of the finished paper is reduced, the quality of the finished paper is improved, and the gum dipping and printing performances of the paper are improved.