阅读说明：本技术 适合施胶法的新型数字热升华转移印花纸及其生产工艺 (Novel digital thermal sublimation transfer printing paper suitable for sizing method and production process thereof ) 是由 赵慧哲 于 2021-08-09 设计创作，主要内容包括：本发明涉及转印纸技术领域,具体涉及一种适合施胶法的新型数字热升华转移印花纸及其生产工艺。适合施胶法的新型数字热升华转移印花纸包括背涂层、原纸层和功能性涂层；所述功能性涂层位于原纸层表面,所述背涂层位于原纸层背面；原纸层由浆料形成,包括中性胶或酸性胶和纤维素纸浆；功能性涂层由功能性化学品涂料形成,包括吸墨材料和分散染料固着剂；背涂层由背涂涂料形成,为胶液或水。其中功能性化学品涂料高固含量低黏度,且低涂布量,体系粘度稳定,适合多种造纸设备施胶法工艺高速生产,弥补了国际现有技术的空白。本发明的转印纸功能性涂层不易渗透至原纸层,承载墨量高,减少了由于墨水渗透导致的渗透虚花、低转移率及图案不精细等问题。(The invention relates to the technical field of transfer printing paper, in particular to novel digital thermal sublimation transfer printing paper suitable for a sizing method and a production process thereof. The novel digital thermal sublimation transfer printing paper suitable for the sizing method comprises a back coating, a raw paper layer and a functional coating; the functional coating is positioned on the surface of the raw paper layer, and the back coating is positioned on the back surface of the raw paper layer; the raw paper layer is formed from pulp, including neutral or acid glue and cellulose pulp; the functional coating is formed by functional chemical paint and comprises an ink absorbing material and a disperse dye fixing agent; the back coating is formed by back coating paint and is glue solution or water. The functional chemical coating has high solid content and low viscosity, low coating weight and stable system viscosity, is suitable for high-speed production of various sizing methods of papermaking equipment, and fills the blank of the international prior art. The functional coating of the transfer paper is not easy to permeate the base paper layer, the ink bearing amount is high, and the problems of permeation virtual patterns, low transfer rate, non-fine patterns and the like caused by ink permeation are solved.)

1. A novel digital thermal sublimation transfer printing paper suitable for a sizing method is characterized by comprising a back coating, a raw paper layer and a functional coating; the functional coating is positioned on the surface of the raw paper layer, and the back coating is positioned on the back surface of the raw paper layer; the raw paper layer is formed from a pulp comprising a neutral or acid gum and cellulose pulp; the functional coating is formed by functional chemical paint, and the functional chemical paint comprises an ink absorbing material and a disperse dye fixing agent; the back coating is formed by back coating which is glue solution or water.

2. The novel digital sublimation transfer printing paper suitable for the sizing method according to claim 1, characterized in that the neutral size is one or more of alkyl ketene dimer, styrene maleic anhydride copolymer, alkenyl succinic anhydride; the acid glue is one or more of saponified rosin glue, strengthened rosin glue and dispersed rosin glue.

3. The novel digital thermal sublimation transfer printing paper suitable for the sizing method according to claim 2, characterized in that the slurry further comprises a synergist comprising one or more of polyamide-polyamine-epichlorohydrin resin, epichlorohydrin-dimethylamine polymer, polyacrylamide, glyoxal, aluminium sulphate; the addition amount of the neutral glue is more than or equal to 8kg/T body paper, and the synergist is more than or equal to 0.1kg/T body paper.

4. The new digital sublimation transfer printing paper suitable for sizing according to claim 1, characterized in that the blotting material includes but is not limited to sodium carboxymethyl cellulose, sodium carboxymethyl starch, small molecule hydroxyl compounds, guar gum; the small molecular hydroxyl compound comprises but is not limited to starch-based modified latex, trihydroxymethyl propane, ethylene glycol, glycerol, trihydroxymethyl aminomethane, glucose and fructose; the disperse dye fixing agent comprises but is not limited to quaternary ammonium salt type cationic water-soluble polymers, polyamide-polyamine-epichlorohydrin resin, aromatic sulfonate polycondensate and polydimethyldiallyl ammonium chloride.

5. The new digital sublimation transfer printing paper suitable for the sizing process according to claim 4, wherein the blotting material further comprises polyacrylamide and polyvinyl alcohol.

6. The new digital sublimation transfer printing paper suitable for the sizing process according to claim 1, wherein the functional chemical coating further comprises fillers and auxiliaries.

7. The novel digital sublimation transfer printing paper suitable for the sizing method according to claim 6, wherein the functional chemical coating comprises 60 to 90 parts by mass of an ink absorbing material, 0.5 to 20 parts by mass of a disperse dye fixing agent, 10 to 40 parts by mass of a filler and 0.5 to 2 parts by mass of an auxiliary agent.

8. The new digital sublimation transfer printing paper suitable for the sizing method according to claim 1, characterized in that the glue solution is starch glue and polyvinyl alcohol; the glue solution comprises 80-90 parts by weight of starch glue and 10-30 parts by weight of polyvinyl alcohol; the solid content of the glue solution is 12-14%, and the viscosity is 30-60map.

9. The process for producing the novel digital sublimation transfer printing paper suitable for the sizing method according to any one of claims 1 to 8, wherein the functional chemical coating is coated on the surface of the raw paper layer by the sizing method, and the back coating is coated on the back of the raw paper layer.

10. The process for the production of a new digital sublimation transfer printing paper suitable for sizing according to claim 9, comprising the steps of:

step 1: preparing slurry and functional chemical coating;

step 2: dehydrating and forming the slurry by a head box, a forming net, a water scraping plate and a squeezing part, and modifying by a drying cylinder to obtain a raw paper layer;

and step 3: coating functional chemical paint on the surface of the raw paper layer obtained in the step (2) in a high-speed paper machine in a glue sizing process mode, and coating back coating paint on the back of the raw paper layer in the glue sizing process mode;

and 4, step 4: drying and rolling the product obtained in the step 3 in a high-speed paper machine; cutting, rewinding and packaging outside the high-speed paper machine; and (5) obtaining the product.

Technical Field

The invention relates to the technical field of novel digital thermal sublimation transfer printing paper, in particular to novel digital thermal sublimation transfer printing paper suitable for a glue applying method and a production process thereof.

Background

Because the digital sublimation transfer printing technology has the advantages of environmental protection, high efficiency, high precision, high reaction speed and the like, the technology meets the technical requirements of modern market customers and the requirements of human beings on environmental protection, and the traditional gravure printing technology which has large pollution, fussy plate making and high investment is gradually replaced. The prediction shows that the annual average composite growth rate of the market scale of the digital thermal sublimation transfer printing is up to 20 percent, and an effective solution is provided for improving the sustainability and reducing the energy and resource consumption. As a substitute process for traditional printing, digital thermal sublimation transfer printing technology is widely used in the fields of clothing, home textiles, industrial textiles, and the like. Needless to say, the digital sublimation transfer printing has a very wide market prospect. Is gradually becoming a new mainstream technology in the printing and dyeing industry.

The existing thermal sublimation transfer printing paper production process is mainly divided into two processes of coating in a paper making device or coating in an external coating machine: firstly, the traditional paper making enterprises carry out in-machine on-line coating in a paper making equipment machine, secondly, the thermal sublimation transfer printing body paper is produced and then is coated and processed by a coating machine to obtain the thermal sublimation transfer printing paper, and then the thermal sublimation transfer printing paper is cut, rewound and packaged to obtain a finished product. In recent years, due to the high-speed development of the digital sublimation transfer printing technology, customers increasingly put higher requirements on the use cost, the performance and the efficiency of the digital sublimation transfer printing paper, many related enterprises at home and abroad are simulated blindly with wind, and only the gram weight of product materials or the coating weight are required to be reduced to reduce the production cost and the selling unit price of the customers, so that the product performance is uneven, various problems of false flowers, low transfer rate, non-fine patterns and the like caused by uneven coating and insufficient ink bearing amount exist, and the printing bearing performance is poor. The invention patent of China with publication number CN108894053A discloses a thermal sublimation transfer printing paper suitable for high-speed production in a machine, which can meet the effects of increasing the running speed of a paper making device and the printing performance of a product by adding an isolation layer in a raw paper layer and then coating a coating layer by adopting a paper making device in-machine coating process, but the production engineering is relatively complicated, the coating cost is increased after the isolation layer is added, and the thermal sublimation transfer printing paper is not suitable for most paper making devices. In addition, many traditional papermaking equipment exist, and the hardware investment time of the equipment is short, so that the equipment is not suitable for the production of the digital sublimation transfer printing paper in a machine-built coating process. Meanwhile, the paper making equipment built-in coating process can only carry out wet coating with the moisture content of about 10-30% when paper is not completely dried, and has higher requirements on the water absorption, the permeation resistance and the film forming property of designed coating of the paper. In addition, international existing coating formula technologies have the defects of high viscosity, low solid content and coating weight of 4-8g, and are difficult to meet the requirements of operating parameters of a coating process in a papermaking device and the ideal performance requirements of product application.

Therefore, the design of a novel digital thermal sublimation transfer printing paper suitable for a sizing method and a production process thereof have very important significance.

Disclosure of Invention

In view of the above, there is a need to design a novel digital thermal sublimation transfer printing paper suitable for a sizing method and a production process thereof, and the novel digital thermal sublimation transfer printing paper prepared by adopting the sizing method has comprehensive properties of environmental protection, energy conservation, low production cost, low gram weight of a product, large ink carrying capacity of the product, good printing performance of the product and the like.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the invention relates to a novel digital thermal sublimation transfer printing paper suitable for a sizing method, which comprises a back coating, a raw paper layer and a functional coating; the functional coating is positioned on the surface of the raw paper layer, and the back coating is positioned on the back surface of the raw paper layer; the raw paper layer is formed by pulp, and the pulp comprises neutral glue or acid glue and cellulose pulp; the functional coating is formed by functional chemical paint, and the functional chemical paint comprises an ink absorbing material and a disperse dye fixing agent; the back coating is formed by back coating which is glue solution or water.

Further, in the novel digital sublimation transfer printing paper suitable for the sizing method, the neutral size is one or more of alkyl ketene dimer, styrene maleic anhydride copolymer and alkenyl succinic anhydride. The neutral glue is a high molecular substance containing multi-active functional groups, and can react with hydroxyl in the pulp to form a firm covalent bond, so that the paper has certain water resistance and strength characteristics.

Further, in the novel digital thermal sublimation transfer printing paper suitable for the sizing method, the acid glue is one or more of saponified rosin glue, strengthened rosin glue and dispersed rosin glue; in the drying process, the rosin size reacts with hydroxyl in the fiber to generate chemical bond combination, the internal sizing effect is good, the curing time is short, and the good water resistance and strength can be obtained in the production operation.

The cellulose pulp is a cellulose pulp commonly used in the traditional papermaking field, and comprises a plant fiber raw material or a non-plant fiber raw material, and the invention is not particularly limited.

Further, in the novel digital thermal sublimation transfer printing paper suitable for the sizing method, the slurry further comprises a synergist, and the synergist comprises one or more of polyamide-polyamine-epichlorohydrin resin, epichlorohydrin-dimethylamine polymer, polyacrylamide, glyoxal and aluminum sulfate. The synergist can accelerate the curing speed of neutral glue or acid glue, improve the initial strength of paper, increase the anti-permeability of the paper and reduce the water absorption performance.

Further, the parameters of the base paper are as follows: tightness degree0.6g/cm³(ii) a COBB hydroscopicity: 10-25g/m²(ii) a Tensile strength (machine direction): more than 2.0 kN/m; tear (transverse direction): more than 110 mN; the water immersion elasticity (transverse) is less than 2.1 percent, the air permeability is 5-15 mu m/pa.s, and the gram weight is 15-35 g/m²。

Furthermore, in the novel digital thermal sublimation transfer printing paper suitable for the sizing method, the addition amount of neutral glue or acid glue in the pulp of the base paper layer is not less than 8kg/T base paper, and the synergist is not less than 0.1kg/T base paper.

Furthermore, in the novel digital thermal sublimation transfer printing paper suitable for the sizing method, the raw paper layer slurry also contains cationic starch glue, and the cationic starch glue is not less than 8kg/T raw paper.

Further, in the novel digital thermal sublimation transfer printing paper suitable for the sizing method, the functional chemical coating also comprises a filler and an auxiliary agent.

Further, in the above-mentioned novel digital sublimation transfer printing paper suitable for the sizing method, the blotting material includes, but is not limited to, sodium carboxymethyl cellulose, sodium carboxymethyl starch, small molecule hydroxyl compound, guar gum; the small molecular hydroxyl compound comprises but is not limited to starch-based modified latex, trihydroxymethyl propane, ethylene glycol, glycerol, trihydroxymethyl aminomethane, glucose and fructose; the disperse dye fixing agent is a cationic water-soluble polymer, and comprises but is not limited to quaternary ammonium salt type cationic water-soluble polymers, polyamide-polyamine-epichlorohydrin resin, aromatic sulfonate polycondensate and polydimethyl diallyl ammonium chloride; the filler comprises one or more of oxidized starch, oat raw starch, esterified starch, cross-linked starch, calcined kaolin, light calcium carbonate, titanium dioxide and silicon dioxide. The auxiliary agent includes but is not limited to one or more of a leveling agent, a bactericide and an antifoaming agent.

Further, in the above-mentioned novel digital sublimation transfer printing paper suitable for the sizing method, the starch-based modified latex is modified starch containing hydroxyl group and having a core-shell structure, such as PVA modified starch latex, epichlorohydrin modified starch latex, methoxy-polyethylene glycol-carboxylic acid modified starch, and the like. The product has a certain space network structure and low viscosity; the coating has certain film forming property, can prevent the coating from seeping downwards, has good ink absorption, and ensures that the product can meet the bearing and use requirements of ink amount under the condition of low coating amount of a sizing method process.

Further, in the above-mentioned novel digital sublimation transfer printing paper suitable for the sizing method, the blotting material further includes polyacrylamide. The weight average molecular weight of polyacrylamide is less than 400 ten thousand, the sodium carboxymethylcellulose is selected from low-viscosity models, meanwhile, the micromolecule hydroxyl compound has the characteristics of high solid content and low viscosity, the viscosity of a coating system can be obviously reduced, the models of the three raw materials are selected, the viscosity of a functional chemical coating is reduced, the solid content is improved, the quick-drying performance of the coating is improved, and the operation of a sizing method is convenient.

Further, in the above-mentioned novel digital sublimation transfer printing paper suitable for the sizing method, the blotting material further includes polyvinyl alcohol. Wherein the polyvinyl alcohol preferably has an average polymerization degree of more than or equal to 1600 and a molecular weight of more than or equal to 72000; in order to better prevent paint penetration.

Further, in the above-described novel digital thermal sublimation transfer printing paper suitable for the sizing method, the filler is a mixture of calcined kaolin and oxidized starch.

Furthermore, in the novel digital thermal sublimation transfer printing paper suitable for the sizing method, the functional chemical coating comprises, by mass, 60-90 parts of an ink absorbing material, 0.5-20 parts of a disperse dye fixing agent, 10-40 parts of a filler and 0.5-2 parts of an auxiliary agent.

Furthermore, in the novel digital thermal sublimation transfer printing paper suitable for the sizing method, the solid content of the functional chemical coating is 10-30%, and the viscosity is less than or equal to 1500 mpa.s.

Further, in the novel digital thermal sublimation transfer printing paper suitable for the sizing method, the glue solution is starch glue.

Further, in the novel digital thermal sublimation transfer printing paper suitable for the sizing method, the glue solution is starch glue and polyvinyl alcohol.

Preferably, in the novel digital thermal sublimation transfer printing paper suitable for the sizing method, the glue solution comprises 80-90 parts by weight of starch glue and 10-30 parts by weight of polyvinyl alcohol; the solid content of the glue solution is 12-14%, and the viscosity is 30-60map.

In a second aspect, the invention designs a production process of novel digital thermal sublimation transfer printing paper suitable for a sizing method, which is characterized in that a functional chemical coating is coated on the surface of a raw paper layer by adopting the sizing method, and a back coating is coated on the back of the raw paper layer.

Further, the manner of sizing includes, but is not limited to, sizing processes such as film transfer, metering size press, spraying, dipping, and the like.

Further, the production process of the novel digital thermal sublimation transfer printing paper suitable for the sizing method specifically comprises the following steps:

step 1: preparing slurry and functional chemical coating;

step 2: dehydrating and forming the slurry by a head box, a forming net, a water scraping plate and a squeezing part, and modifying by a drying cylinder to obtain a raw paper layer;

and step 3: coating a functional chemical coating on the surface of the raw paper layer obtained in the step 2 in a high-speed paper machine in a sizing method process mode, and coating a back coating on the back of the raw paper layer in a sizing method mode;

and 4, step 4: drying and rolling the product obtained in the step 3 in a high-speed paper machine; cutting, rewinding and packaging outside the high-speed paper machine; and (5) obtaining the product.

Furthermore, in the step 3 of the production process of the novel digital thermal sublimation transfer printing paper suitable for the sizing method, the sizing amount of the functional chemical coating is 1.0-3 g/m². The back coating has a glue application amount of 0.5-1.5 g/m²。

The invention has the beneficial effects that:

the novel digital thermal sublimation transfer printing paper suitable for the sizing method has the advantages of high solid content of a functional chemical coating system, low and stable viscosity, low sizing amount and suitability for the sizing method process. The low glue application amount ensures the high-speed running speed of the paper machine and is suitable for the production of various traditional paper making equipment. Meanwhile, the production process of the traditional novel digital thermal sublimation transfer printing paper is shortened, the production efficiency is improved, the cost is reduced, and the blank of the international prior art is made up.

The novel digital thermal sublimation transfer printing paper suitable for the sizing method comprises the following steps that a raw paper layer contains neutral glue or acid glue, and the neutral glue or the acid glue reacts with hydroxyl in cellulose pulp to form a firm covalent bond, so that the paper has certain water resistance and strength characteristics; the raw paper layer also contains the synergist, so that the curing speed of the neutral adhesive can be accelerated, the initial strength of paper is further improved, the raw paper layer has certain water resistance and smaller air permeability, the permeation of the functional chemical coating is reduced, the functional chemical coating can form a film better after being coated, the drying and permeation problems of ink in the digital printing process are reduced, and the production efficiency of a transfer printing process link is improved.

And thirdly, the novel digital thermal sublimation transfer printing paper suitable for the sizing method has the advantages that the ink absorption material is selected from polyacrylamide, sodium carboxymethylcellulose, polyvinyl alcohol and micromolecular hydroxyl compounds, the ink absorption performance is excellent, the film forming performance is high, the formed functional coating is not easy to permeate to the raw paper layer, the ink bearing performance is good under the condition of ultralow coating weight, and the problems of permeation deficiency, low transfer rate, non-fine patterns and the like caused by ink permeation are solved. Meanwhile, the micromolecular hydroxyl compound belongs to a hydrophilic substance, is easy to migrate in the functional coating, can quickly absorb water and does not lock the water, is easier to dry in the production process, and has quick-drying property during digital printing; in addition, part of the small molecular hydroxyl compounds show weak anion performance, can be chemically complexed with a synergist with weak cation in the raw paper layer and a disperse dye fixing agent with weak cation in the functional coating, and can form a compact film, thereby providing feasibility for a sizing method process with ultralow coating weight.

And (IV) the novel digital thermal sublimation transfer printing paper functional coating suitable for the sizing method contains a disperse dye fixing agent which is a weak cationic high molecular substance and can be quickly combined and reacted with an anionic disperse dye in digital printing to form a complex with certain water resistance, so that the ink is prevented from permeating into a raw paper layer under the sizing method with ultralow coating weight, and the ink cannot diffuse after being quickly combined with the ink, so that the image fineness is high, no edge burr is generated, and meanwhile, the disperse dye fixing agent has cationic property, so that the novel digital thermal sublimation transfer printing paper functional coating suitable for the sizing method has a good anti-settling effect on calcined kaolin and light calcium carbonate, and a coating system is more uniform and stable.

And fifthly, the back coating formed by the back coating is coated on the back surface of the raw paper layer of the novel digital thermal sublimation transfer printing paper suitable for the sizing method, so that the problems of warping, fiber falling and the like of the novel digital thermal sublimation transfer printing paper in the using process are effectively solved.

Drawings

FIG. 1 is a schematic structural diagram of the novel digital sublimation transfer printing paper of the invention;

FIG. 2 is a print contrast of the novel digital sublimation transfer printing paper prepared in example 1 and comparative examples 1 to 6;

FIG. 3 is a back transmission contrast diagram of the novel digital sublimation transfer printing paper prepared in example 1 and comparative examples 1-6;

FIG. 4 is a graph showing a comparison of the residue of the novel digital sublimation transfer printing papers prepared in example 1 and comparative examples 1 to 6;

FIG. 5 is a print comparison chart of the novel digital sublimation transfer printing paper prepared in example 1 and comparative examples 1-6.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be further clearly and completely described below with reference to the embodiments of the present invention. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1, a novel digital sublimation transfer printing paper suitable for a sizing method comprises a back coating layer, a raw paper layer and a functional coating layer; the functional coating is positioned on the surface of the raw paper layer, and the back coating is positioned on the back surface of the raw paper layer; work (Gong)The grammage of the performance coating is 2g/m²The gram weight of the back coating is 0.8g/m²(ii) a The gram weight of the finished product is 35g/m²。

The base paper layer is formed by pulp, wherein the pulp is cellulose pulp, cationic starch glue with the addition amount of 8kg/T base paper, alkyl ketene dimer with the addition amount of 8kg/T base paper and polyamide-polyamine-epichlorohydrin resin with the addition amount of 0.15kg/T base paper. The cellulose pulp is commonly used in the traditional papermaking field, such as needle pulp: black needle, cloth needle, northern wood, moon, silver star, etc.; broad leaf pulp: green leaf, goldfish, bukui, alpa, etc.

The functional coating is formed by a functional chemical coating, and the functional chemical coating comprises 83 parts of an ink absorbing material, 15 parts of a filler, 5 parts of a disperse dye fixing agent and 1 part of an auxiliary agent in parts by mass; the ink absorbing material comprises, by mass, 80 parts of polyacrylamide, 20 parts of sodium carboxymethylcellulose, 2 parts of polyvinyl alcohol and 10 parts of trihydroxymethyl propane. The solid content of the functional coating is 25 percent, and the viscosity is 1500 mpa.s. The disperse dye fixing agent is a quaternary ammonium salt type cationic water-soluble polymer; the filler is calcined kaolin and oxidized starch; the auxiliary agent is a mixture of a flatting agent, a bactericide and a defoaming agent.

The back coating is formed by back coating paint, and the back coating paint comprises 90 parts of starch glue and 10 parts of polyvinyl alcohol by mass; the solid content of the back coating glue solution is 12%, and the viscosity is 35map.

The novel digital thermal sublimation transfer printing paper suitable for the sizing method is prepared by adopting the following production process:

step 1: preparing slurry and functional chemical coating;

step 2: dehydrating and forming the slurry by a head box, a forming net, a water scraping plate and a squeezing part, and modifying by a drying cylinder to obtain a raw paper layer;

and step 3: coating functional chemical paint on the surface of the raw paper layer obtained in the step (2) in a high-speed paper machine by a sizing method process, and coating glue solution on the back of the raw paper layer by the sizing method process;

and 4, step 4: drying and rolling the product obtained in the step 3 in a high-speed paper machine at one time; cutting, rewinding and packaging outside the high-speed paper machine; and (5) obtaining the product.

Example 2

A novel digital thermal sublimation transfer printing paper suitable for a sizing method comprises a back coating, a raw paper layer and a functional coating; the functional coating is positioned on the surface of the raw paper layer, and the back coating is positioned on the back surface of the raw paper layer; the gram weight of the functional coating is 2.5g/m²The gram weight of the back coating is 0.5g/m²(ii) a The gram weight of the finished product is 35g/m²。

The base paper layer is formed by pulp, wherein the pulp is cellulose pulp, cationic starch glue with the addition of 10kg/T base paper, alkyl ketene dimer with the addition of 10kg/T base paper and epichlorohydrin-dimethylamine polymer with the addition of 0.2kg/T base paper. The cellulose pulp was the same as in example 1.

The functional coating is formed by a functional chemical coating, and the functional chemical coating comprises 90 parts of an ink absorbing material, 9 parts of a filler, 1 part of a disperse dye fixing agent and 1 part of an auxiliary agent by mass; the ink absorbing material comprises, by mass, 75 parts of sodium carboxymethylcellulose, 25 parts of sodium carboxymethyl starch, 1 part of polyvinyl alcohol and 15 parts of tris (hydroxymethyl) aminomethane. The functional coating has a solids content of 20% and a viscosity of 1100 mpa.s. The filler is oxidized starch; the disperse dye fixing agent is polyamide-polyamine-epichlorohydrin resin; the auxiliary agent is a mixture of a flatting agent, a bactericide and a defoaming agent.

The back coating is formed by 85 parts of starch glue and 15 parts of polyvinyl alcohol in parts by mass; the solid content of the back coating glue solution is 13%, and the viscosity is 38map.

The production process of the novel digital thermal sublimation transfer printing paper suitable for the sizing method is the same as that of the example 1.

Example 3

A novel digital thermal sublimation transfer printing paper suitable for a sizing method comprises a back coating, a raw paper layer and a functional coating; the functional coating is positioned on the surface of the raw paper layer, and the back coating is positioned on the back surface of the raw paper layer; the gram weight of the functional coating is 1g/m²The gram weight of the back coating is 0.5g/m²(ii) a The gram weight of the finished product is 35g/m²。

The base paper layer is formed by pulp, wherein the pulp is cellulose pulp, cationic starch glue with the addition amount of 10kg/T base paper, alkyl ketene dimer with the addition amount of 11kg/T base paper and epichlorohydrin-dimethylamine polymer with the addition amount of 0.3kg/T base paper. The cellulose pulp was the same as in example 1.

The functional coating is formed by a functional chemical coating, and the functional chemical coating comprises 80 parts of an ink absorbing material, 9 parts of a filler, 3 parts of a disperse dye fixing agent and 0.5 part of an auxiliary agent in parts by mass; the ink absorbing material comprises, by mass, 50 parts of sodium carboxymethylcellulose and 25 parts of starch-based modified latex, and 5 parts of polyvinyl alcohol. The functional coating has a solids content of 25% and a viscosity of 1100 mpa.s. The filler is oxidized starch; the disperse dye fixing agent is a quaternary ammonium salt type cationic water-soluble polymer; the auxiliary agent is a mixture of a flatting agent, a bactericide and a defoaming agent.

The back coating is formed by 85 parts of starch glue and 15 parts of polyvinyl alcohol in parts by mass; the solid content of the back coating glue solution is 13%, and the viscosity is 38map.

The production process of the novel digital thermal sublimation transfer printing paper suitable for the sizing method is the same as that of the example 1.

Example 4

A novel digital thermal sublimation transfer printing paper suitable for a sizing method is characterized in that a functional coating does not contain trihydroxy methyl propane, and the rest of the structure, the composition and the preparation method are the same as those in example 1.

Comparative example 1

Novel commercially available digital thermal sublimation transfer printing paper (Hangzhou Hua Hailaitian 35 g/m)²)。

Comparative example 2

Commercially available novel digital sublimation transfer printing Paper (Korean Hansol Paper 55 g/m)²)

Comparative example 3

Novel commercially available digital thermal sublimation transfer paper (Coldhove Papier 45g/m in the Netherlands²)

Comparative example 4

A novel digital thermal sublimation transfer printing paper suitable for a sizing method is characterized in that a raw paper layer does not contain polyamide-polyamine-epichlorohydrin resin, and the rest of the structure, the composition and the preparation method are the same as those in example 1.

Comparative example 5

A novel digital thermal sublimation transfer printing paper suitable for a sizing method is characterized in that a raw paper layer does not contain alkyl ketene dimer, and the rest of the structure, the composition and the preparation method are the same as those of example 1.

Comparative example 6

The novel digital thermal sublimation transfer printing paper suitable for the sizing method is characterized in that a disperse dye fixing agent is not added in the components of the formula, and the structure, the composition and the preparation method of the rest components are the same as those in the example 1.

Experimental data

Firstly, the above examples and the comparative preparation of the novel digital sublimation transfer printing paper are tested, and the test results are shown in table 1. The method for testing the average transfer rate (%) of four colors, the printing and drying speed and the image precision of the enterprise standard respectively comprises the following steps:

the test method of the average transfer rate (%) of four colors is as follows: printing a specific test image with a four-color printer; contains four colors, i.e., color block blue 1 (100% C, 0% M, 0% Y, 0% K); color block red 2 (0% C, 100% M, 0% Y, 0% K); color block yellow 3 (0% C, 0% M, 100% Y, 0% K); color block black 4 (0% C, 0% M, 0% Y, 100% K);

after drying, the cloth is placed under a flat ironing machine for transfer printing (the temperature is 220 ℃, the time is 20s, and the transfer printing cloth is white 100 percent polyester taffeta 75D); respectively testing the density of the four-color blocks on the cloth after transfer by using a color densitometer of Alice 528 model according to the measurement requirements of the reflection density in the standard of GB/T18722-2002 printing technology reflection density measurement and application of chromaticity measurement in printing process control, wherein the density is the transfer color density; respectively testing the density of the four-color blocks remained on the paper after transfer printing, namely the density of the residual color, and averaging after respectively testing the transfer rates of the patterns of the four-color blocks on the transfer printing paper; the transfer rate in this document is the four-color average transfer rate.

Transfer ratio (%) - (transfer color density/(transfer color density + residual color density) × 100%

The test method of the printing drying speed comprises the following steps: a specific test image (C, M, Y, K four-color black, 250% of total ink jet amount) was printed, a stopwatch was used to start timing after completion of printing, and then a 1kg iron bar was used to roll back and forth once to observe the offset (the ink black adsorption) of the toilet paper placed above the test pattern until the offset was not present, and the time was recorded.

The image precision testing method comprises the following steps: printing a specific test image (the total ink jet amount is 400%), and then comparing the distance of the two-color mixed burr at the joint of the leftmost black and the deep red with a 100-scale magnifier; and (4) judging the standard: high precision: less than or equal to 100 mu m; medium precision, 100-500 μm; and (3) low precision: not less than 500 μm.

TABLE 1

Second, the transfer papers of example 1 and comparative examples 1 to 6 were subjected to a printing test, and the results are shown in fig. 2 to 5. Wherein FIG. 2 is a print contrast of the novel digital sublimation transfer printing papers prepared in example 1 and comparative examples 1-6; FIG. 3 is a back transmission contrast diagram of the novel digital sublimation transfer printing paper prepared in example 1 and comparative examples 1-6; FIG. 4 is a graph showing a comparison of the residue of the novel digital sublimation transfer printing papers prepared in example 1 and comparative examples 1 to 6; FIG. 5 is a print comparison chart of the novel digital sublimation transfer printing paper prepared in example 1 and comparative examples 1-6. As can be seen from fig. 2 to 5, compared with comparative examples 1 to 6, the transfer paper of example 1 of the present invention has a larger ink carrying capacity, no ink permeation at high ink amount, and better image accuracy, and after being pressed and ironed by a flat press, the paper has less residue, and the printed color of the fabric is vivid;

meanwhile, as shown in table 1, example 1 has better tensile strength and tear resistance; while improving the warpage problem.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.