阅读说明：本技术 一种热升华转移印花纸及其制备方法 (Thermal sublimation transfer printing paper and preparation method thereof ) 是由 楼松彩 于 2021-07-10 设计创作，主要内容包括：本申请涉及造纸领域,更具体地说,它涉及一种转移印花纸及其制备方法,该热升华转移印花纸的制备包括如下步骤：S1、在第一处理剂的辅助下,对废纸和水进行混合并打浆处理,得到原纸浆；S2、对原纸浆进行除杂和脱墨处理,得到二次处理纸浆；S3、向二次处理纸浆中加入第二处理剂,充分处理后,得到三次处理纸浆；S4、三次处理纸浆经流箱、成型、压榨、烘干后,得到热升华转移印花纸；第一处理剂包括碱、羧甲基纤维素钠、阳离子表面活性剂、水溶性壳聚糖,第二处理剂包括填料、磷脂、湿强剂、阳离子型聚丙烯酰胺、双醛淀粉。本申请制备得到的热升华转移印花纸表面平整,拉毛点较少,具有较好的着色均匀度。(The application relates to the field of papermaking, in particular to transfer printing paper and a preparation method thereof, wherein the preparation method of the thermal sublimation transfer printing paper comprises the following steps: s1, mixing and pulping the waste paper and water with the aid of a first treating agent to obtain raw paper pulp; s2, performing impurity removal and deinking treatment on the raw paper pulp to obtain secondary treated paper pulp; s3, adding a second treating agent into the secondary treated paper pulp, and fully treating to obtain tertiary treated paper pulp; s4, carrying out flow box, forming, squeezing and drying on the paper pulp treated for the third time to obtain the thermal sublimation transfer printing paper; the first treating agent comprises alkali, sodium carboxymethyl cellulose, cationic surfactant and water-soluble chitosan, and the second treating agent comprises filler, phospholipid, wet strength agent, cationic polyacrylamide and dialdehyde starch. The thermal sublimation transfer printing paper prepared by the method has the advantages of smooth surface, fewer napping points and better coloring uniformity.)

1. A preparation method of thermal sublimation transfer printing paper is characterized by comprising the following steps:

s1, mixing and pulping the waste paper and water with the aid of a first treating agent to obtain raw paper pulp;

s2, performing impurity removal and deinking treatment on the raw paper pulp to obtain secondary treated paper pulp;

s3, adding a second treating agent into the secondary treated paper pulp, and fully treating to obtain tertiary treated paper pulp;

s4, carrying out flow box, forming, squeezing and drying on the paper pulp treated for the third time to obtain the thermal sublimation transfer printing paper;

wherein the first treating agent comprises the following components in parts by mass per 100 parts by mass of the total weight of the waste paper and the water:

6-10 parts of alkali;

0.1-0.2 parts of sodium carboxymethylcellulose;

0.3-0.5 part of cationic surfactant;

0.1-0.2 part of water-soluble chitosan;

the second treating agent comprises the following components in parts by mass per 100 parts by mass of secondarily treated pulp:

24-28 parts of a filler;

3-5 parts of phospholipid;

1-2 parts of a wet strength agent;

0.01-0.1 part of cationic polyacrylamide;

0.2-0.4 part of dialdehyde starch.

2. The method for preparing the thermal sublimation transfer printing paper as claimed in claim 1, wherein the filler comprises silica and calcium carbonate in a mass ratio of (0.02-0.1): 1, and the particle size of the silica and the particle size of the calcium carbonate are both less than 50 μm.

3. The method for preparing the thermal sublimation transfer printing paper as claimed in claim 1, wherein the second treating agent further comprises 0.2-0.8 parts by mass of toughening fibers per 100 parts by mass of the secondary treated paper pulp, wherein the toughening fibers are any one or a combination of any number of polyester fibers, polytetrafluoroethylene fibers and polyurethane fibers.

4. The preparation method of the thermal sublimation transfer printing paper as claimed in claim 3, wherein the toughening fibers are polytetrafluoroethylene fibers, and the length of the polytetrafluoroethylene fibers is 0.1-1 mm.

5. The method for preparing thermal sublimation transfer printing paper according to claim 1, wherein the second treating agent further comprises 0.1 to 0.3 parts by mass of sodium pyrophosphate per 100 parts by mass of the secondary treated paper pulp.

6. The method for preparing the thermal sublimation transfer printing paper as claimed in claim 5, wherein the second treating agent further comprises 0.3-0.4 parts by mass of a defoaming agent per 100 parts by mass of the secondary treated paper pulp.

7. The method for preparing thermal sublimation transfer printing paper according to claim 5, wherein in step S1, the beating degree of the prepared raw paper pulp is 23-25 ° SR.

8. The thermal sublimation transfer printing paper according to claim 7, wherein the pulp concentration of the obtained secondary treated pulp is not less than 20% in step S3.

9. The method of claim 7, wherein the first treating agent further comprises 0.1-0.15 parts by mass of sodium metaaluminate, 0.1-0.2 parts by mass of magnesium sulfate, and 0.3-0.5 parts by mass of sodium silicate, per hundred parts by mass of the total mass of the waste paper and the water in step S2.

10. A thermal sublimation transfer printing paper, which is produced by the production method according to any one of claims 1 to 9.

Background

The thermal sublimation transfer printing paper is an important carrier in a transfer printing process and has the function of transferring ink to printed matters (generally polyester products). The thermal sublimation transfer printing paper generally needs to have good pressure resistance and high temperature resistance, good flatness, strong tensile strength and good humorous adaptability.

Due to the limitation of raw materials, the flatness of domestic thermal sublimation transfer printing paper is poorer than that of imported products, and more napping points are arranged on the surface of the domestic thermal sublimation transfer printing paper, so that more spots appear in the printing process and the printing quality is influenced.

Disclosure of Invention

In order to reduce the napping points on the surface of the prepared printing paper, the application provides the thermal sublimation transfer printing paper and the preparation method thereof.

Firstly, the application provides a preparation method of thermal transfer printing paper, which adopts the following technical scheme:

1. a preparation method of thermal sublimation transfer printing paper is characterized by comprising the following steps:

s1, mixing and pulping the waste paper and water with the aid of a first treating agent to obtain raw paper pulp;

s2, performing impurity removal and deinking treatment on the raw paper pulp to obtain secondary treated paper pulp;

s3, adding a second treating agent into the secondary treated paper pulp, and fully treating to obtain tertiary treated paper pulp;

s4, carrying out flow box, forming, squeezing and drying on the paper pulp treated for the third time to obtain the thermal sublimation transfer printing paper;

wherein the first treating agent comprises the following components in parts by mass per 100 parts by mass of the total weight of the waste paper and the water:

6-10 parts of alkali;

0.1-0.2 parts of sodium carboxymethylcellulose;

0.3-0.5 part of cationic surfactant;

0.1-0.2 part of water-soluble chitosan;

the second treating agent comprises the following components in parts by mass per 100 parts by mass of secondarily treated pulp:

24-28 parts of a filler;

3-5 parts of phospholipid;

1-2 parts of a wet strength agent;

0.01-0.1 part of cationic polyacrylamide;

0.2-0.4 part of dialdehyde starch.

First, in the present application, the raw materials are all recycled waste paper, meeting the requirements of environmental protection. On the basis, the waste paper can be pulped by crushing, and a certain amount of enzyme can be applied in the pulping process to assist the pulping of the waste paper. After pulping, firstly, the fibers are treated by sodium carboxymethyl cellulose and alkali, wherein the alkali is a common auxiliary agent and can enable the fibers to generate swelling action, the alkali can be strong alkali such as sodium hydroxide, potassium hydroxide and the like, and the swelled fibers can form micelles under the action of the sodium carboxymethyl cellulose. The cationic surfactant can play a role in stabilizing the micelle, and has a better effect on the stabilization of the micelle compared with the anionic surfactant and the nonionic surfactant. The addition of the water-soluble chitosan is helpful for further improving the pulping effect, reducing the pulping energy consumption and forming uniform and stable paper pulp. Here, the cationic surfactant may be selected from amine salt surfactants, quaternary ammonium salt surfactants, and pyridinium salt surfactants.

And secondly, in the second treating agent, phospholipid and dialdehyde starch are adopted, wherein the phospholipid has amphipathy, compared with a common surfactant, molecular chains of the phospholipid are soft and easy to flow, formed micelles are not easy to damage, the micelle and fiber molecules are more directionally arranged in a system, and the phenomenon of wool cluster knotting of fibers after the fibers are formed in a flow box is reduced. In addition, dialdehyde starch has better coupling effect to the amino, consequently, under the prerequisite that contains water-soluble chitosan in first finishing agent, dialdehyde starch can and form better coupling structure between the water-soluble chitosan, and then further makes to arrange more in order between the fibre, reduces the feather point that draws on the thermal sublimation transfer printing paper surface that makes, improves the coloured degree of consistency in thermal sublimation transfer printing paper surface.

In conclusion, in the application, in the process of preparing the thermal sublimation transfer printing paper, the combination of the first treating agent and the second treating agent reduces the phenomenon that fibers in paper pulp are knotted to form a hair mass, so that the number of napping points on the prepared thermal sublimation transfer printing paper is small, and the coloring performance and the printing quality of the thermal sublimation transfer printing paper are improved.

Optionally, the filler comprises silicon dioxide and calcium carbonate in a mass ratio of (0.02-0.1) to 1, and the particle sizes of the silicon dioxide and the calcium carbonate are both less than 50 μm.

In the technical scheme, the filler is silicon dioxide and calcium carbonate, the particle size is small, the filler is uniformly dispersed, and a certain amount of silicon dioxide is doped, so that the integral strength is improved. Due to the existence of micelles in the system, the fine silicon dioxide and calcium carbonate are added to form a system similar to colloid, the whole system is stable and uniform, meanwhile, micelle aggregation is reduced to a certain extent, the effect of uniform distribution of the micelles is promoted, the effect reflected on the thermal transfer printing paper is that napping points are reduced, and the coloring is more uniform.

Optionally, the second treating agent further comprises 0.2-0.8 parts by mass of toughening fibers per 100 parts by mass of the secondarily treated paper pulp, wherein the toughening fibers are any one or a combination of any several of polyester fibers, polytetrafluoroethylene fibers and polyurethane fibers.

The addition of the toughening fibers is beneficial to improving the toughness and tensile strength of the paper, so that the prepared thermal sublimation transfer printing paper has better processing performance.

Optionally, the toughening fibers are polytetrafluoroethylene fibers, and the length of the polytetrafluoroethylene fibers is 0.1-1 mm.

The polycarbonate with the thickness of 1-10 mu m has better overall strength, more uniform dispersion in a system and better practicability.

Optionally, the second treating agent further comprises 0.1-0.3 parts by mass of sodium pyrophosphate per 100 parts by mass of the secondary treated paper pulp.

The sodium pyrophosphate has the effect of a metal ion complexing agent, can complex part of metal ions flowing out of the printing ink in the waste paper in a system, reduces the influence of the metal ions on micelles, and can dissolve a surfactant and calcium soap formed by calcium and magnesium ions in the system, so that the system formed among fibers is more uniform, and the fluidity of paper pulp is improved.

Optionally, the second treating agent also comprises 0.3-0.4 part by mass of every 100 parts of secondary treated paper pulp

The defoaming agent of (1).

In the technical scheme, the defoaming agent is added to inhibit the surfactant from generating bubbles, so that the paper pulp running process is more uniform and stable, and the quality of the manufactured thermal sublimation transfer printing paper is improved.

Optionally, in step S1, the beating degree of the prepared raw paper pulp is 23-25 ° SR.

The paper pulp with the beating degree of 23-25 degrees SR is adopted, the whole fluidity of the paper pulp is good, more paper pulp is reserved, the loss is small, and the loss to equipment is small.

Alternatively, in step S3, the pulp concentration of the resultant secondary-treated pulp is not less than 20%.

In the technical scheme, the paper pulp with higher concentration is adopted, and the added formula improves the flowing property of the paper pulp, so that the pressure on equipment is lower and the production efficiency is higher in the whole paper pulp operation process.

Optionally, in step S2, the first treating agent further includes, by mass, 0.1 to 0.15 parts of sodium metaaluminate, 0.1 to 0.2 parts of magnesium sulfate, and 0.3 to 0.5 parts of sodium silicate, based on each hundred parts of the total mass of the waste paper and the water.

In an overall alkaline environment, the sodium metaaluminate is firstly hydrolyzed to generate aluminum hydroxide, the aluminum hydroxide has the function of partial filler, and simultaneously can form a certain stable aluminum silicate-magnesium silicate structure with the sodium silicate, the aluminum silicate and the magnesium silicate have better adsorbability, the filler is filled in an aluminum silicate-magnesium silicate system to form a stable result, and the formation of the aluminum silicate-magnesium silicate mixed crystal structure is also helpful for the filler to be more uniformly distributed on the prepared thermal sublimation transfer printing paper due to the smaller particle size of the filler, so that the uniformity of the coloring capacity of the thermal sublimation transfer printing paper is further improved.

In addition, the application also relates to thermal sublimation transfer printing paper which is prepared by the preparation method.

The thermal sublimation transfer printing paper prepared by the method has the advantages of less surface napping points, uniform integral coloring, better strength, better economic effect and market value.

In summary, the present application has at least one of the following advantages:

1. in this application, first finishing agent and second finishing agent carry out twice processing to paper pulp to through the mating reaction of water-soluble chitosan and dialdehyde starch, the phenomenon that the fibre reunion was knotd takes place in the reduction paper pulp, reduces thermal sublimation transfer printing paper and then makes the thermal sublimation transfer printing paper surface that the preparation obtained more level and more smooth, and it is more even to color.

2. In this application further sets up, through adding sodium pyrophosphate, can complex the remaining partial metal ion in the printing ink, reduce the destruction to the micelle, the thermal sublimation transfer printing paper surface smoothness of further improvement system.

3. In the further arrangement of the application, a composite structure of aluminum silicate-magnesium silicate is formed by adding a combination of sodium metaaluminate, magnesium sulfate and sodium silicate, so that the distribution of fillers and fibers is more uniform, and the coloring uniformity of the prepared thermal sublimation transfer printing paper is further improved.

Detailed Description

The present application will be described in further detail with reference to examples.

In the following examples, the sources and parameters of some of the materials are shown in Table 1.

TABLE 1 table of sources of Material Components

Examples 1 to 3, a thermal sublimation transfer printing paper, which is specifically prepared by the following steps.

S1, cutting waste paper, adding a first treating agent according to the specific gravity of 500 kg/ton of water and shown in the table 2, and pulping the waste paper to obtain raw paper pulp; and after pulping, measuring the degree of pulping of the original paper pulp to be 25 DEG SR.

S2, carrying out high-concentration impurity removal on the base paper pulp, then carrying out coarse screening, diluting until the concentration is 4%, carrying out low-concentration impurity removal, then carrying out fine screening and deinking treatment, and then increasing the concentration after deinking to obtain secondary treatment paper pulp, wherein the concentration of the secondary treatment paper pulp is controlled to be 25 +/-0.5%.

S3, adding a second treating agent into the secondary treated paper pulp, and stirring at a stirring speed of 45rpm for 5min to obtain tertiary treated paper pulp; the second treating agent is added in the following amount in each ton of secondary treated pulp:

240kg of filler;

phospholipid 30kg

10kg of wet strength agent;

0.1kg of cationic polyacrylamide;

2kg of dialdehyde starch;

wherein, the filler is silicon dioxide and calcium carbonate with the mass ratio of 0.02: 1, and the silicon dioxide and the calcium carbonate are both sieved by a 800-mesh sieve.

S4, carrying out flow box, forming, squeezing and drying on the paper pulp treated for the three times to obtain the thermal sublimation transfer printing paper, and controlling the gram weight of the thermal sublimation transfer printing paper to be 30 +/-2 g/m through parameters²And the thickness is 0.05 +/-0.01 mm.

TABLE 2 first treating agent component (kg) added per 1t of water and waste paper in examples 1 to 3

Numbering	Alkali	Sodium carboxymethylcellulose	Cationic surfactant	Water-soluble chitosan
					Example 1	80	1	5	2
Example 2	60	1.5	4	1.5
					Example 3	100	2	3	1

Wherein, the alkali is sodium hydroxide, the cationic surfactant is dodecyl trimethyl ammonium bromide, and the wet strength agent is polyamide polyepichlorohydrin resin.

Examples 4 to 8, a thermal sublimation transfer printing paper, different from example 1 in that the first treating agent further comprises the components shown in Table 3 per 1t of the total amount of water and waste paper.

Table 3, first treating agent component (kg) added per 1t of water and waste paper in examples 4 to 8

Numbering	Sodium metaaluminate	Magnesium sulfate	Sodium silicate
				Example 4	0.15	0.1	0.3
Example 5	0.1	0.2	0.5
				Example 6	0	0.1	0.3
Example 7	0.15	0	0.3
				Example 8	0.15	0.1	0

For the adjustment of the first treating agent, comparative examples were set as follows.

Comparative examples 1 to 3, a thermal sublimation transfer printing paper, differs from example 1 in that the composition of the first treating agent per 1 ton of the total amount of water and waste paper is shown in table 4.

Table 4, first treating agent component (kg) added per 1t of water and waste paper in comparative examples 1 to 3

Numbering	Alkali	Sodium carboxymethylcellulose	Cationic surfactant	Water-soluble chitosan
					Comparative example 1	80	0	5	2
Comparative example 2	80	1	0	2
					Comparative example 3	80	1	2	0

Comparative example 4, a thermal sublimation transfer printing paper, differs from example 1 in that the cationic surfactant is replaced by a nonionic surfactant of equal mass, which is dodecyl glucoside.

Comparative example 5, a thermal sublimation transfer printing paper, differs from example 1 in that cationic surfactant is replaced by anionic surfactant of equal mass, and sodium dodecyl sulfate is selected as anionic surfactant.

Examples 9 to 17 are different from example 5 in that the second treating agent was adjusted so that the composition of the second treating agent is shown in table 5 for each ton of twice-treated pulp.

TABLE 5 composition (kg) of the second treating agent used for each ton of secondarily treated pulp in examples 9 to 17

In examples 11 to 17, the toughening fibers were polyester fibers having a length of 1mm, and the defoaming agent was a silicone defoaming agent.

Example 18, a thermal sublimation transfer printing paper, differs from example 16 in that the toughening fibers are polytetrafluoroethylene fibers having a length of 1 mm.

Example 19, a thermal sublimation transfer printing paper, differs from example 16 in that the toughening fibers are polytetrafluoroethylene fibers having a length of 0.1 mm.

Example 20, a thermal sublimation transfer printing paper, differs from example 16 in that the toughening fibers are polytetrafluoroethylene fibers having a length of 3 mm.

For the above examples, comparative examples were set as follows.

Comparative examples 6 to 9, a thermal sublimation transfer printing paper, which is different from example 1 in that the components of the second treating agent added per ton of secondary treated wastewater are shown in table 6.

Table 6, comparative examples 6 to 9 correspond to the composition (kg) of the second treating agent for twice treating pulp per ton

Example 21, a thermal sublimation transfer printing paper, was different from example 19 in that the base paper having a freeness of 23 ° SR was obtained in step S1.

Example 22, a thermal sublimation transfer printing paper, was different from example 19 in that the base paper having a freeness of 20 ° SR was obtained in step S1.

Example 23, a thermal sublimation transfer printing paper, differs from example 19 in that in step S3, the concentration of pulp is controlled to 21 ± 0.5%.

Example 24, a thermal sublimation transfer printing paper, differs from example 19 in that in step S3, the concentration of pulp is controlled to 18 ± 0.5%.

Example 25, a thermal sublimation transfer printing paper, differs from example 19 in that the filler is a composition of silica and calcium carbonate in a mass ratio of 0.1: 1, and both the silica and calcium carbonate are sieved through a 200 mesh sieve.

Example 26, a thermal sublimation transfer printing paper, differs from example 16 in that the filler is calcium carbonate sieved through 800 mesh.

The following experiment was conducted for the above examples and comparative examples to examine the properties of the produced thermal sublimation transfer printing paper.

Experiment 1, paper smoothness experiment, refer to GB/T456-2002 paper and board smoothness determinator (Buick method), and determine smoothness of the thermal sublimation transfer printing paper obtained by preparation.

Experiment 2, paper tensile strength determination: the tensile strength of the prepared thermal sublimation transfer printing paper is measured by referring to a constant-speed loading method in GB/T12914-2008 'paper and paperboard tensile strength measurement'.

First, experiments 1 and 2 were performed on examples 1 to 8 and comparative examples 1 to 5, and the results are shown in table 7.

Table 7, examples 1 to 8 and comparative examples 1 to 5 show the results of the experiments

According to the experimental data, compared with the preparation method in the comparative example, the thermal sublimation transfer printing paper prepared by the method has better flatness and tensile strength, and due to the improvement of the tensile strength, fibers on the surface of the paper are not easy to break to form napping points and are not easy to knot, and the flatness is higher, so that the coloring performance is better, and better printing effect can be realized in the transfer printing process.

In examples 4 to 8, the components of sodium metaaluminate, sodium silicate and magnesium sulfate added to the first treating agent are adjusted, and the flatness of the surface of the paper is improved by forming an aluminum silicate-magnesium silicate composite system, which may be based on the principle that the aluminum silicate-magnesium silicate composite system has better adhesion on fibers, and simultaneously, the filler on the formed thermal sublimation transfer printing paper can be uniformly distributed, the stacking phenomenon of the filler is reduced, and the smoothness of the surface of the thermal sublimation transfer printing paper is further improved.

In comparative examples 1 to 5, the phenomenon of reduced tensile strength can be seen, and the reduced tensile strength can cause the surface fibers of the transfer printing paper to be easily broken in the production process, and the broken fibers are easily knotted and wound in the subsequent treatment process, so that the printing paper is not uniformly colored. Meanwhile, there is a more remarkable tendency that comparative examples 1 to 5 all cause a decrease in smoothness, partly due to a decrease in tensile strength, and partly due to uneven distribution of the material and failure to orient the fibers well. The cationic surfactant is absent in the comparative example 2, the nonionic surfactant is selected in the comparative example 4, the anionic surfactant is selected in the comparative example 5, and the three surfactants have obvious influences on the dispersibility of the micelle and the directional arrangement capacity of the fiber, so that the cationic surfactant can be used for better improving the flatness in the technical scheme of the application. In comparative example 3, water-soluble chitosan is absent, so that few amino groups in the system have coupling reaction with dialdehyde starch in the second treating agent, further causing disorder of fiber arrangement in the paper pulp, and reducing the flatness of the prepared thermal sublimation transfer printing paper.

Further, experiments 1 and 2 were performed for examples 9 to 17 and comparative examples 6 to 9, and the results are shown in table 8.

Table 8, examples 9 to 17 and comparative examples 6 to 9

In the technical scheme, the second treating agent is adopted to treat the secondary treatment paper pulp, and the flatness of the prepared thermal sublimation transfer printing paper is further improved by virtue of the coupling effect of dialdehyde starch and the emulsification effect of phospholipid. The strength of the thermal sublimation transfer printing paper is obviously improved by adding the toughening fibers, and the flatness of the thermal sublimation transfer printing paper is also improved from another angle by improving the strength. In examples 14 to 15, sodium pyrophosphate was added to complex a part of the remaining metal ions, and to form a certain coating structure on the formed aluminum silicate-calcium silicate system, and the coated aluminum silicate-calcium silicate system was more stably combined with a filler to form a more warranty structure.

Further, experiments 1 and 2 were performed for examples 18 to 25, and the results are shown in table 9.

Table 9, Experimental results of examples 18 to 2

In the above experimental data, some parameters were further adjusted. Examples 18-20 demonstrate that the use of polycarbonate in the present application has a better toughening effect than other toughening fibers. The reason for this may be that the polycarbonate has good mechanical properties and is overall hard, whereas in examples 25 to 26 the composition of the filler is adjusted. Compared with a single calcium carbonate filler, the composite system of calcium carbonate and silicon dioxide is adopted, and the integral flatness is better.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.