阅读说明：本技术 一种适用于三胺板的柔性压纹工艺 (Flexible embossing process suitable for triamine plate ) 是由 曾敏华 谭炎新 胡硕飞 吴惠娟 郭占河 于 2021-07-27 设计创作，主要内容包括：本发明公开了一种适用于三胺板的柔性压纹工艺,包括以下步骤:制备具有高硬度花纹且耐高温的离型纸；软化装饰纸；软化基板；将所述离型纸、装饰纸和基板输送至组坯热压工位,按序叠放并进行压贴,通过所述离型纸在所述装饰纸上完成压纹的同时所述装饰纸和基板完全复合,特殊的压纹工艺保证离型纸花纹清晰,立体感强,可直接用于压贴三胺板,替代钢模板,减少三胺板压纹成本,使用软化浸渍装饰纸配合经过2次软化处理的纤维板经离型纸高温压贴制成的软化三胺板可成型性优异,弯曲后不容易折断,表面不开裂,造型效果好,解决了轻薄三胺板弯曲容易折断开裂的技术难题,经过合理的压贴工艺制得的成品甲醛释放量≤0.03mg/m～(3),环保健康,理化性能优异,可广泛用于制作弯曲造型家具,提高室内空间装饰的美观性和实用性。(The invention discloses a flexible embossing process suitable for a triamine plate, which comprises the following steps of preparing high-hardness pattern and high-temperature resistant release paper; softening the decorative paper; softening the substrate; the manufacturing method comprises the steps of conveying release paper, decorative paper and a substrate to a group assembly hot pressing station, stacking in sequence and pressing, wherein the decorative paper and the substrate are completely compounded when embossing is finished on the decorative paper through the release paper, a special embossing process ensures that the patterns of the release paper are clear, the stereoscopic impression is strong, the release paper can be directly used for pressing and pasting a triamine plate to replace a steel template, the embossing cost of the triamine plate is reduced, the softened triamine plate manufactured by matching softened impregnation decorative paper with a fiber plate subjected to softening treatment for 2 times through high-temperature pressing of the release paper is excellent in formability, and the bent triamine plate is bentThe thin triamine plate is not easy to break after bending, the surface is not cracked, the modeling effect is good, the technical problem that the thin triamine plate is easy to break and crack when being bent is solved, and the formaldehyde emission of a finished product prepared by a reasonable pressing process is less than or equal to 0.03mg/m 3 The environment-friendly and healthy furniture has excellent physical and chemical properties, can be widely used for manufacturing bent modeling furniture, and improves the aesthetic property and the practicability of indoor space decoration.)

1. A flexible embossing process suitable for triamine plates, comprising the steps of:

coating photosensitive resin slurry on base paper, arranging an embossing workpiece to emboss the photosensitive resin slurry, and irradiating the photosensitive resin slurry through a radiation curing process to cure and form the photosensitive resin slurry;

step (2) softening the decorative paper, namely soaking the decorative base paper in urea-formaldehyde resin impregnation liquid, drying, coating amine-aldehyde resin coating liquid on the surface of the decorative base paper, and drying, wherein the urea-formaldehyde resin impregnation liquid and the amine-aldehyde resin coating liquid both comprise a first softening agent;

softening the substrate, namely, preparing the substrate by using the raw materials for preparing the substrate after being softened by high-temperature cooking, and spraying a second softening agent on the surface of the substrate to perform secondary softening treatment;

and (4) conveying the release paper, the decorative paper and the substrate to a blank assembling hot-pressing station, stacking in sequence and pressing, and completely compounding the decorative paper and the substrate while embossing on the decorative paper through the release paper.

2. The flexible embossing process for triamine plates according to the claim 1, wherein in the step (1), the radiation curing process is electron beam curing, and the photosensitive resin slurry is composed of acrylate-epoxy resin, vinyl resin, alkyl sodium sulfonate, high temperature resistant assistant and photoinitiator.

3. The flexible embossing process suitable for triamine plates according to the claim 2, wherein the high temperature resistant auxiliary agent is composed of nano silica and aluminosilicate according to the mass ratio of 1: 6.

4. The flexible embossing process suitable for the triamine plate as set forth in the claim 1, wherein in the step (2), the mass ratio of the urea-formaldehyde resin impregnation liquid is 100 parts of urea-formaldehyde resin, 0.2-0.4 part of penetrating agent, 0.5-0.7 part of curing agent, 0.2-0.4 part of first softening agent;

the mass ratio of the urea-formaldehyde resin is that formaldehyde is 100 parts, urea is 76-80 parts, water is 10-20 parts, and a composite additive is 6-10 parts, wherein the molar ratio F/U of the formaldehyde to the urea is less than or equal to 1.

5. The flexible embossing process suitable for triamine plates according to the claim 1, wherein in the step (2), the mass ratio of the amine aldehyde resin coating liquid is 100 parts of amine aldehyde resin, 0.1-0.3 part of penetrating agent, 0.1-0.3 part of release agent, 0.5-0.7 part of curing agent, 0.5-0.8 part of first softening agent;

the mass ratio of the amine-aldehyde resin is that formaldehyde is 100 parts, melamine is 100 parts, water is 40-60 parts, and a composite additive is 8-10 parts.

6. The flexible embossing process for triamine plates in the step (2), wherein the drying operation is a temperature-variable drying operation with a temperature gradient rising and then a temperature gradient falling.

7. The flexible embossing process for triamine plates according to the claim 1, wherein in the step (3), the substrate is a fiber board, the thickness of the fiber board is 1 to 3mm, and the density is 0.85 to 1.0g/cm³Formaldehyde emission is less than or equal to 0.03mg/m³The high-temperature cooking is carried out at the cooking pressure of 0.7-1.2 MPa and the temperature of 160-180 ℃ for 3-5 min.

8. The flexible embossing process for triamine plates according to the claim 1, wherein in the step (3), the second softening agent comprises 20 to 25% by weight of acetic acid, 5 to 10% by weight of diethylene glycol, 65 to 75% by weight of purified water, and 50 to 60g/m of spraying amount²。

9. The flexible embossing process suitable for triamine plates, according to the claim 1, characterized in that in the step (4), the assembly hot pressing station is provided with a hot press for pressing and pasting, the pressure is 13-22 MPa, the temperature is 190-210 ℃, and the time is 16-26 s.

10. The flexible embossing process for triamine plates as claimed in claim 1, wherein in the step (4), the pattern definition of the release paper is obviously reduced, and when the contrast deviation of the texture depth deviates from the requirement, the release paper needs to be replaced by a new release paper.

Technical Field

The invention belongs to the technical field of plates, and particularly relates to a flexible embossing process suitable for triamine plates.

Background

The triamine board is named as artificial board with melamine impregnated glued membrane paper as decorative surface, and is produced through soaking decorative paper with different colors and grains in melamine resin adhesive, drying to certain curing degree, spreading on shaving board, medium density fiber board or hard fiber board and hot pressing.

The texture of the conventional triamine plate is formed by pressing and pasting steel templates, one steel template can only be used as one pattern and is easy to scratch, a large amount of design cost is input in the early stage, frequent repair is needed in the using process, the single repair cost needs thousands to ten thousand yuan, the glossiness of the steel template after repair is difficult to achieve consistently, the input cost is from tens of thousands to ten thousand yuan, the production cost of the triamine plate with the texture is high, and the glossiness of the triamine plate is deviated; on the other hand, the light and thin triamine plate is easy to break and crack due to bending, so that the surface of furniture with a bent shape cannot be attached, and the application range of the triamine plate is greatly limited.

The invention aims to reduce the embossing cost of the triamine plate and solve the technical problems of easy bending and breaking of the triamine plate and surface cracking, so that the triamine plate can be attached to furniture with a bent shape, and the attractiveness and practicability of indoor space decoration are further improved.

Disclosure of Invention

In view of the problems in the related art, the present invention provides a flexible embossing process for triamine plates, so as to overcome the above technical problems in the related art.

The technical scheme of the invention is realized as follows:

a flexible embossing process suitable for triamine sheets comprising the steps of:

coating photosensitive resin slurry on base paper, arranging an embossing workpiece to emboss the photosensitive resin slurry, and irradiating the photosensitive resin slurry through a radiation curing process to cure and form the photosensitive resin slurry;

step (2) softening the decorative paper, namely soaking the decorative base paper in urea-formaldehyde resin impregnation liquid, drying, coating amine-aldehyde resin coating liquid on the surface of the decorative base paper, and drying, wherein the urea-formaldehyde resin impregnation liquid and the amine-aldehyde resin coating liquid both comprise a first softening agent;

softening the substrate, namely, preparing the substrate by using the raw materials for preparing the substrate after being softened by high-temperature cooking, and spraying a second softening agent on the surface of the substrate to perform secondary softening treatment;

and (4) conveying the release paper, the decorative paper and the substrate to a blank assembling hot-pressing station, stacking in sequence and pressing, and completely compounding the decorative paper and the substrate while embossing on the decorative paper through the release paper.

Firstly, the release paper with high-hardness patterns and high-temperature resistance is adopted to replace a steel template to emboss the decorative paper, the release paper with different patterns only needs to be matched with the same 2-3 ten thousand yuan mold, the release paper can be repeatedly used, the scratching is not easy to occur, the embossing cost of the triamine plate is greatly reduced, and the problem of gloss deviation cannot be caused.

Secondly, considering that even the release paper with high-hardness patterns is difficult to achieve the same hardness of a steel template and possibly influences the appearance effect of the texture, the invention softens the decorative paper and the substrate, reduces the rigid impact of the decorative paper and the substrate on the patterns of the release paper during embossing, prolongs the service life of the release paper, and simultaneously the softened decorative paper can conveniently and quickly stamp the clear three-dimensional texture; on the other hand, the softened decorative paper and the base plate can be attached to furniture with a bent shape, so that the application range of the triamine plate is expanded.

Finally, the release paper, the decorative paper and the substrate are conveyed to a group blank hot-pressing station to be stacked in sequence, the embossing process and the group blank hot-pressing process can be carried out simultaneously, the production efficiency is high, the original production line equipment can still be continuously used, and the refitting cost is reduced.

In the step (1), the radiation curing process is electron beam curing, and the photosensitive resin slurry is composed of acrylate-epoxy resin, vinyl resin, sodium alkyl sulfonate, a high-temperature resistant auxiliary agent and a photoinitiator. Specifically, the components comprise, by weight, 50-80% of acrylate-epoxy resin, 7.5-20% of vinyl resin, 5-15% of alkyl sodium sulfonate, 5-14.5% of high-temperature resistant auxiliary agent and 0.5-2.5% of photoinitiator.

The photoinitiator is diaryl iodonium salt or triaryl sulfur salt.

The electron beam curing has the advantages of short curing time and regional curing, can be perfectly matched with the embossing roller, meets the requirement that the embossing and curing processes of the release paper are carried out simultaneously, has accurate and clear patterns, and ensures the effect that the release paper transfers the patterns to the decorative paper.

The traditional patterned release paper has poor high-temperature resistance, insufficient pattern performance and poor stereoscopic impression, can be used only for 5-8 times, is easy to curl and generate static electricity, and therefore needs to be improved to meet the requirements of the invention. The acrylate-epoxy resin is selected as a main electron beam curing resin material, and is prepared by mixing acrylate and epoxy resin, the hardness of the epoxy resin after photosensitive curing is extremely high, the requirement of high-hardness patterns is met, the acrylate is added to control the viscosity, and the leveling and spreading of the photosensitive resin slurry are facilitated.

The addition of the vinyl resin in a certain proportion enables the forming property of the photosensitive resin slurry to be better, and has the function of assisting in improving the mechanical strength. The sodium alkyl sulfonate endows the formed patterns with antistatic performance, is convenient for demoulding in later pressing and pasting and is used as an emulsifier of a resin polymerization system.

The high-temperature-resistant auxiliary agent is composed of nano silicon dioxide and aluminosilicate in a mass ratio of 1: 6. Firstly, the aluminosilicate and the nano-silica have high temperature resistance, the added aluminosilicate and the nano-silica endow the formed pattern of the release paper with high temperature resistance to meet the high-temperature laminating process requirement of a triamine plate, and meanwhile, the nano-silica can still keep high hardness and high toughness at high temperature, so that the nano-silica also has the effect of assisting in improving the hardness of the formed pattern of the release paper; and secondly, the thixotropy of the photosensitive resin slurry can be improved by mixing and adding the two components, and the improvement of the thixotropy is beneficial to uniformly mixing all the components of the photosensitive resin slurry and ensures that the formed patterns of the release paper have high-quality smooth appearance.

In the step (1), the coating amount of the photosensitive resin sizing agent on the base paper is 0.6-1.0 g/m²The release paper can resist the high temperature of 220-230 ℃, meanwhile, the pattern color expressive force is enhanced, the edge curling is not easy to happen, and the service life of the release paper is prolonged.

In the step (1), the gram weight of the base paper is 150-200 g/m²The base paper is dedusted by a fan, vacuum drying is carried out for 2-3 min at the temperature of 120-130 ℃, and then corona treatment is carried out at the power of 0.8-1.0 kW, so that the adhesion capacity of the surface of the base paper is increased.

In the step (1), the embossing workpiece is an embossing roller, the temperature of the embossing roller is 200-230 ℃, the linear pressure is 6-10 MPa, and clear patterns, strong stereoscopic impression and small contrast deviation of texture depth of the release paper are guaranteed.

In the step (2), the mass ratio of the urea-formaldehyde resin impregnation liquid is that 100 parts of urea-formaldehyde resin, 0.2-0.4 part of penetrating agent, 0.5-0.7 part of curing agent and 0.2-0.4 part of first softening agent;

the mass ratio of the urea-formaldehyde resin is as follows, formaldehyde 100 parts, urea 76-80 parts, composite additive 6-10 parts and water 10-20 parts, the molar ratio F/U of the formaldehyde and the urea is less than or equal to 1, the content of free formaldehyde in the urea-formaldehyde resin is effectively reduced, so that the effect of ultralow formaldehyde release is achieved, and the formaldehyde release amount is not rebounded after the urea-formaldehyde resin is pressed and cured at high temperature and high pressure after multiple tests prove that the ratio of the urea-formaldehyde resin is.

In the step (2), the mass ratio of the amine aldehyde resin coating liquid is 100 parts of amine aldehyde resin, 0.1-0.3 part of penetrating agent, 0.5-0.7 part of curing agent, 0.5-0.8 part of first softening agent and 0.1-0.3 part of release agent;

the mass ratio of the amine-aldehyde resin is that formaldehyde is 100 parts, melamine is 100 parts, water is 40-60 parts, and a composite additive is 8-10 parts.

In the step (2), the penetrating agent is fatty acid polyvinyl ether.

In the step (2), the curing agent comprises hydrochloric acid and hexamethylenetetramine, the mass ratio of the hydrochloric acid to the hexamethylenetetramine is 0.3:1, the resin can be rapidly cured under a heating condition without being influenced by the high and low molar ratio and the high and low free formaldehyde, and the technical difficulties that the curing time is long and the resin is difficult to cure due to the reduction of the molar ratio are solved.

In the step (2), the first softening agent is T65, so that the resin is softened, the toughness of the resin is enhanced, and the technical problem of cracking of the curved surface of the triamine plate is solved.

In the step (2), the release agent is a higher fatty acid.

In the step (2), the composite additive comprises waterborne polyurethane, methacrylic acid and silicate with the mass ratio of 3:2:1, and has the effects of enabling linear molecular chain resin to generate a reticular macromolecular structure after curing, not only not influencing the bonding strength, but also improving the polymerization strength after curing, solving the influence of reducing the molar ratio on the wet bonding strength and the bonding strength, and simultaneously ensuring the surface physical and chemical properties of the amine-aldehyde resin after pressing, sticking and curing.

In the step (2), the impregnation speed of the urea-formaldehyde resin impregnation liquid is 25-30 m/min, and the tension is 45 +/-0.1N, so that the urea-formaldehyde resin impregnation liquid fully permeates the decorative paper, and the decorative paper is fully softened.

In the step (2), the mass ratio of the front surface gum dipping amount to the back surface gum dipping amount of the decorative base paper is adjusted to be 3:2 through a metering roller, so that the quality performance of the decorative paper impregnated by the urea resin impregnation liquid after being pressed, pasted and cured and the bonding strength of the decorative paper and the base material are ensured.

In the step (2), the mass ratio of the front coating weight to the back coating weight of the decorative base paper is adjusted to be 5.5:4.5 through a metering roll, so that the quality performance of the decorative paper coated with the amine aldehyde resin coating liquid after being pressed and cured and the bonding strength of the decorative paper with a base material are ensured.

In the step (2), the drying operation is a variable temperature drying operation in which the temperature is increased in a gradient manner and then decreased in a gradient manner, so that the resin has certain fluidity in the drying process, a uniform and continuous film adhesive layer is formed, and the curing degree and the volatile content of the resin are better controlled. Specifically, the decorative base paper impregnated with the urea resin impregnation liquid enters an oven, is dried for 30-40 seconds in three ovens at 120 ℃, 140 ℃ and 130 ℃, is coated with the amine-aldehyde resin coating liquid on two sides after being dried and cooled, and is dried for 40-50 seconds in six ovens at 130 ℃, 135 ℃, 140 ℃, 150 ℃, 135 ℃ and 130 ℃.

The technical parameters of the decorative paper prepared by the step (2) are that the gum dipping amount is 120-190%, the volatile matter is 5.5-9.0%, the pre-curing degree is 40-65%, and the formaldehyde release amount is less than or equal to 0.3 mg/L.

In the step (3), the substrate is a fiberboard, the thickness of the fiberboard is 1-3 mm, and the density of the fiberboard is 0.85-1.0 g/cm³Formaldehyde emission is less than or equal to 0.03mg/m³The high-temperature cooking is carried out at the cooking pressure of 0.7-1.2 MPa and the temperature of 160-180 ℃ for 3-5 min.

In the step (3), the second softener comprises, by weight, 20-25% of acetic acid, 5-10% of diethylene glycol, 65-75% of purified water, and 50-60 g/m of spraying amount²And after spraying, the substrate is naturally dried for later use, and the permeability and plasticity of the substrate are improved while the secondary softening treatment is carried out.

In the step (4), a hot press is arranged at the assembly hot-pressing station for pressing and pasting, the pressure is 13-22 MPa, the temperature is 190-210 ℃, and the time is 16-26 s.

In the step (4), the pattern definition of the release paper is obviously reduced, and when the contrast deviation of the texture depth deviates from the requirement, the release paper needs to be replaced by new release paper, generally, the release paper is replaced after being embossed for 15 times.

The invention has the beneficial effects that:

(1) the high-temperature resistance of the release paper is improved by adopting the electron beam hardening resin and the high-temperature resistant auxiliary agent, the hardness and the color expressive force of patterns are enhanced simultaneously, the curling is not easy, the service life of the release paper is prolonged, the antistatic performance is endowed by the alkyl sodium sulfonate, the special embossing process ensures that the patterns of the release paper are clear, the third dimension is strong, the release paper can be directly used for pressing and pasting the triamine plate, a steel template is replaced, the use range of the release paper is enlarged, and the design development and the later repair maintenance cost of the triamine plate pressing and pasting steel template are reduced.

(2) The softened triamine plate made of the softened impregnated decorative paper matched with the fiber board subjected to softening treatment for 2 times through high-temperature pressing of release paper has excellent formability, is not easy to break after bending, has no surface crack and good shaping effect, and solves the technical problem that the light triamine plate is easy to break and crack when bent.

(3) The finished product prepared by using the low formaldehyde release impregnated decorative paper, the fiberboard with low formaldehyde content and the environment-friendly softener through a reasonable pressing process has the formaldehyde release amount less than or equal to 0.03mg/m³Environment protection, health and excellent physical and chemical properties.

(4) The production equipment is an improved automatic continuous pressing production line, the development of production technology and the improvement and upgrading of equipment are promoted, the production process is scientific and efficient, the production efficiency is improved, and the production cost is reduced.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious 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

a. Preparing release paper with high-hardness patterns and high-temperature resistance:

a1. selecting and treating base paper, wherein the gram weight is 150g/m²The base paper is dedusted by a fan, is subjected to vacuum drying at 120 ℃ for 2min, and is subjected to corona treatment at the power of 0.8 kW.

a2. Coating photosensitive resin paste, namely coating the photosensitive resin paste on base paper, wherein the coating amount is 0.6g/m²The photosensitive resin slurry consists of 50% of acrylate epoxy resin, 20% of vinyl resin, 15% of sodium alkyl sulfonate, 14.5% of high-temperature resistant auxiliary agent and 0.5% of photoinitiator (diaryl iodonium salt); the high-temperature-resistant auxiliary agent consists of nano silicon dioxide and aluminosilicate, and the mass ratio of the nano silicon dioxide to the aluminosilicate is 1: 6; and hardening by adopting an electron beam after coating the photosensitive resin slurry.

a3. Surface embossing, wherein the temperature of an embossing roller is 200 ℃, and the linear pressure is 6 MPa.

a4. And (6) cooling and rewinding.

b. Preparation of softened decorative paper:

b1. the decorative base paper is dipped into urea-formaldehyde resin dipping solution, which comprises 100kg of urea-formaldehyde resin, 0.2kg of penetrating agent (fatty acid polyvinyl ether), 0.5kg of curing agent and 0.2kg of first softening agent by mass;

the dipping parameter is 60 percent of dipping amount; the urea-formaldehyde resin is prepared from 100kg of formaldehyde, 76kg of urea, 10kg of water and 6kg of compound additive in mass ratio; the dipping speed is 25m/min, and the tension is 45N.

And adjusting the mass ratio of the front gum dipping amount to the back gum dipping amount of the decorative base paper to be 3:2 by a metering roller.

b2. And (3) putting the impregnated decorative base paper into an oven, and drying for 30s in a three-section oven at 120 ℃, 140 ℃ and 130 ℃.

b3. The coating liquid comprises, by mass, 100kg of amine aldehyde resin, 0.1kg of penetrating agent (fatty acid polyvinyl ether), 0.1kg of release agent (higher fatty acid), 0.5kg of curing agent and 0.5kg of first softening agent (T65).

The curing agent comprises hydrochloric acid and hexamethylenetetramine, and the mass ratio of the hydrochloric acid to the hexamethylenetetramine is 0.3: 1.

The dipping parameter is 90 percent of dipping amount; the amine-aldehyde resin is prepared from 100kg of formaldehyde, 100kg of melamine, 40kg of water and 8kg of composite additive.

The composite additive comprises waterborne polyurethane, methacrylic acid and silicate, and the mass ratio of the waterborne polyurethane to the silicate is 3:2: 1.

And adjusting the mass ratio of the front coating weight to the back coating weight of the decorative base paper to be 5.5:4.5 by a metering roll.

b4. The glued adhesive film paper enters the oven again and is dried for 40s by six sections of ovens at 130 ℃, 135 ℃, 140 ℃, 150 ℃, 135 ℃ and 130 ℃.

b5. And after secondary drying, cooling, cutting into required length in a cutting machine to obtain softened impregnated decorative paper for later use, wherein the parameters are that the gum dipping amount is 150%, the volatile matter is 6.5%, the pre-curing degree is 55%, and the formaldehyde emission is 0.2 mg/L.

c. Softening the substrate:

c1. the material used in the manufacture of the fiberboard is softened by high-temperature cooking, and the wood chips for manufacturing the fiberboard are cooked under the conditions that the pressure is 0.7MPa, the temperature is 160 ℃ and the time is 5min for primary softening;

c2. spraying a second softening agent on the surface of the fiberboard, wherein the thickness of the fiberboard is 2.5mm, and the density is 1.0g/cm³Formaldehyde emission 0.02mg/m³The second softener consists of 25% acetic acid, 10% diethylene glycol and 65% purified water, and the spraying amount is 60g/m²Naturally drying for later use after spraying;

d. and (3) assembling and hot-pressing, namely installing a plane die on the upper part and the lower part of a press, preparing release paper in place, ensuring that the pattern surface of the release paper is attached to the impregnated decorative paper when pressing is carried out, arranging the release paper 5cm away from the plane die, pressing for 15 times, then automatically starting a winding device to replace the next release paper, moving the softened fiber board to a conveying table through a board loading device, entering a paper loading area, starting a paper laying machine to lay the softened impregnated decorative paper on the surface of the fiber board, conveying the fiber board into a hot press for pressing, carrying out trimming and inspection after board discharge, and thus obtaining a finished product.

Example 2

a. Preparing release paper with high-hardness patterns and high-temperature resistance:

a1. selecting and treating base paper, wherein the gram weight is 180g/m²The base paper is dedusted by a fan, vacuum dried at 125 ℃ for 2.5min and then corona treated at the power of 0.9 kW.

a2. Coating photosensitive resin paste, namely coating the photosensitive resin paste on base paper, wherein the coating amount is 0.8g/m²The photosensitive resin slurry consists of 65% of acrylate epoxy resin, 15% of vinyl resin, 9% of sodium alkyl sulfonate, 9.5% of high-temperature resistant auxiliary agent and 1.5% of photoinitiator (triaryl sulfate); the high-temperature-resistant auxiliary agent consists of nano silicon dioxide and aluminosilicate, and the mass ratio of the nano silicon dioxide to the aluminosilicate is 1: 6; and hardening by adopting an electron beam after coating the photosensitive resin slurry.

a3. Surface embossing, wherein the temperature of an embossing roller is 215 ℃, and the linear pressure is 8 MPa.

a4. And (6) cooling and rewinding.

b. Preparation of softened decorative paper:

b1. the decorative base paper is dipped into urea-formaldehyde resin dipping solution, which comprises 100kg of urea-formaldehyde resin, 0.3kg of penetrating agent (fatty acid polyvinyl ether), 0.6kg of curing agent and 0.3kg of first softener (T65);

the curing agent comprises hydrochloric acid and hexamethylenetetramine, and the mass ratio of the hydrochloric acid to the hexamethylenetetramine is 0.3: 1.

The dipping parameter is 60 percent of dipping amount; the urea-formaldehyde resin is prepared from 100kg of formaldehyde, 78kg of urea, 15kg of water and 8kg of compound additive in mass ratio; the dipping speed was 28m/min and the tension was 45N.

And adjusting the mass ratio of the front gum dipping amount to the back gum dipping amount of the decorative base paper to be 3:2 by a metering roller.

b2. And (3) the impregnated decorative base paper enters an oven and is dried for 35s in three-section ovens at 120 ℃, 140 ℃ and 130 ℃.

b3. The coating liquid comprises, by mass, 100kg of amine aldehyde resin, 0.2kg of penetrating agent (fatty acid polyvinyl ether), 0.2kg of release agent (higher fatty acid), 0.6kg of curing agent and 0.65kg of first softening agent (T65).

The dipping parameter is 90 percent of dipping amount; the amine-aldehyde resin is prepared from 100kg of formaldehyde, 100kg of melamine, 50kg of water and 9kg of composite additive.

The composite additive comprises waterborne polyurethane, methacrylic acid and silicate, and the mass ratio of the waterborne polyurethane to the silicate is 3:2: 1.

And adjusting the mass ratio of the front coating weight to the back coating weight of the decorative base paper to be 5.5:4.5 by a metering roll.

b4. The glued adhesive film paper enters the oven again and is dried for 45s by six sections of ovens at 130 ℃, 135 ℃, 140 ℃, 150 ℃, 135 ℃ and 130 ℃.

b5. And after secondary drying, cooling, cutting into required length in a cutting machine to obtain softened impregnated decorative paper for later use, wherein the parameters are that the gum dipping amount is 150%, the volatile matter is 6.5%, the pre-curing degree is 55%, and the formaldehyde emission is 0.2 mg/L.

c. Softening the substrate:

c1. the material used in the manufacture of the fiberboard is softened by high-temperature cooking, and the wood chips for manufacturing the fiberboard are cooked under the conditions that the pressure is 0.9MPa, the temperature is 170 ℃ and the time is 4min for primary softening;

c2. spraying a second softening agent on the surface of the fiberboard, wherein the thickness of the fiberboard is 2.5mm, and the density is 1.0g/cm³Formaldehyde emission 0.02mg/m³The second softener consists of 22.5% acetic acid, 17.5% diethylene glycol and 60% purified water, and the spraying amount is 55g/m²Naturally drying for later use after spraying;

d. and (3) assembling and hot-pressing, namely installing a plane die on the upper part and the lower part of a press, preparing release paper in place, ensuring that the pattern surface of the release paper is attached to the impregnated decorative paper when pressing is carried out, arranging the release paper 5cm away from the plane die, pressing for 15 times, then automatically starting a winding device to replace the next release paper, moving the softened fiber board to a conveying table through a board loading device, entering a paper loading area, starting a paper laying machine to lay the softened impregnated decorative paper on the surface of the fiber board, conveying the fiber board into a hot press for pressing, carrying out trimming and inspection after board discharge, and thus obtaining a finished product.

Example 3

a. Preparing release paper with high-hardness patterns and high-temperature resistance:

a1. selecting and treating base paper, wherein the gram weight is 200g/m²The base paper is dedusted by a fan, vacuum dried at 130 ℃ for 3min and then corona treated under the power of 1.0 kW.

a2. Coating photosensitive resin paste, namely coating the photosensitive resin paste on base paper, wherein the coating amount is 1.0g/m²The photosensitive resin slurry consists of 80% of acrylate epoxy resin, 7.5% of vinyl resin, 5% of sodium alkyl sulfonate, 5% of high-temperature resistant auxiliary agent and 2.5% of photoinitiator (triaryl sulfate); the high-temperature-resistant auxiliary agent consists of nano silicon dioxide and aluminosilicate, and the mass ratio of the nano silicon dioxide to the aluminosilicate is 1: 6; and hardening by adopting an electron beam after coating the photosensitive resin slurry.

a3. Surface embossing, wherein the temperature of an embossing roller is 230 ℃, and the linear pressure is 10 MPa.

a4. And (6) cooling and rewinding.

b. Preparation of softened decorative paper:

b1. the decorative base paper is dipped into urea-formaldehyde resin dipping solution, which comprises 100kg of urea-formaldehyde resin, 0.4kg of penetrating agent (fatty acid polyvinyl ether), 0.7kg of curing agent and 0.4kg of first softener (T65);

the curing agent comprises hydrochloric acid and hexamethylenetetramine, and the mass ratio of the hydrochloric acid to the hexamethylenetetramine is 0.3: 1.

The dipping parameter is 60 percent of dipping amount; the urea-formaldehyde resin is prepared from 100kg of formaldehyde, 80kg of urea, 20kg of water and 10kg of compound additive in mass ratio; the dipping speed is 30m/min, and the tension is 45N.

And adjusting the mass ratio of the front gum dipping amount to the back gum dipping amount of the decorative base paper to be 3:2 by a metering roller.

b2. And (3) putting the impregnated decorative base paper into an oven, and drying for 40s in a three-section oven at 120 ℃, 140 ℃ and 130 ℃.

b3. The coating liquid comprises, by mass, 100kg of amine aldehyde resin, 0.3kg of penetrating agent (fatty acid polyvinyl ether), 0.3kg of release agent (higher fatty acid), 0.7kg of curing agent and 0.8kg of first softening agent (T65).

The dipping parameter is 90 percent of dipping amount; the amine-aldehyde resin is prepared from 100kg of formaldehyde, 100kg of melamine, 60kg of water and 10kg of composite additive.

The composite additive comprises waterborne polyurethane, methacrylic acid and silicate, and the mass ratio of the waterborne polyurethane to the silicate is 3:2: 1.

And adjusting the mass ratio of the front coating weight to the back coating weight of the decorative base paper to be 5.5:4.5 by a metering roll.

b4. The glued adhesive film paper enters the oven again and is dried for 50s by six sections of ovens at 130 ℃, 135 ℃, 140 ℃, 150 ℃, 135 ℃ and 130 ℃.

b5. And after secondary drying, cooling, cutting into required length in a cutting machine to obtain softened impregnated decorative paper for later use, wherein the parameters are that the gum dipping amount is 150%, the volatile matter is 6.5%, the pre-curing degree is 55%, and the formaldehyde emission is 0.2 mg/L.

c. Softening the substrate:

c1. the material used in the manufacture of the fiberboard is softened by high-temperature cooking, and the wood chips for manufacturing the fiberboard are cooked under the conditions that the pressure is 1.2MPa, the temperature is 180 ℃ and the time is 3min for primary softening;

c2. spraying a second softening agent on the surface of the fiberboard, wherein the thickness of the fiberboard is 2.5mm, and the density is 1.0g/cm³Formaldehyde emission 0.02mg/m³The second softener consists of 20% acetic acid, 5% diethylene glycol and 75% purified water, and the spraying amount is 60g/m²Naturally drying for later use after spraying;

d. and (3) assembling and hot-pressing, namely installing a plane die on the upper part and the lower part of a press, preparing release paper in place, ensuring that the pattern surface of the release paper is attached to the impregnated decorative paper when pressing is carried out, arranging the release paper 5cm away from the plane die, pressing for 15 times, then automatically starting a winding device to replace the next release paper, moving the softened fiber board to a conveying table through a board loading device, entering a paper loading area, starting a paper laying machine to lay the softened impregnated decorative paper on the surface of the fiber board, conveying the fiber board into a hot press for pressing, carrying out trimming and inspection after board discharge, and thus obtaining a finished product.

The results of the physical and chemical property tests of the softened triamine boards prepared in examples 1 to 3 and the ordinary triamine board are shown in table 1.

Table 1 comparison of the test results of the examples with those of the common triamine plate

As can be seen from Table 1, the finished product of the invention has pattern definition, grain depth deviation, glossiness and surface performance reaching the effect of the common triamine plate pressed and pasted by the steel template, which shows that the release paper can completely replace the steel template, and the formaldehyde emission of the finished product is only 0.02mg/m³The environment-friendly and healthy furniture has the advantages of environmental protection, health, physical and chemical properties exceeding the national standard requirements, mechanical properties superior to those of common triamine plates, excellent formability, curvature radius of more than or equal to 100mm, no crack, no bubble, no layering phenomenon and good modeling effect, and can be widely applied to the bending part structure of furniture and indoor space decoration.

The production line comprises a plate feeding device, a conveying platform, a paper laying machine, a hot press, an edge trimmer and a stacker, wherein the main improvement is that a frame for placing release paper is arranged at the plate inlet end of the hot press, and a device for winding the release paper is arranged at the plate outlet end of the hot press, so that the release paper is automatically collected and released.

Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.