CN114103319A

CN114103319A - UV rubber cloth and preparation method thereof

Info

Publication number: CN114103319A
Application number: CN202111323328.3A
Authority: CN
Inventors: 徐毛清; 高杰亮; 徐佳; 唐雪华; 俞辉
Original assignee: Jiangsu Kangpu Printing Technology Co ltd
Current assignee: Jiangsu Kangpu Printing Technology Co ltd
Priority date: 2021-11-09
Filing date: 2021-11-09
Publication date: 2022-03-01

Abstract

The invention provides a UV rubber blanket and a preparation method thereof, wherein the UV rubber blanket at least comprises the following components: a first base material layer; the bonding layer is positioned on the first base material layer; the second base material layer is positioned on the bonding layer; the foaming layer is positioned on the second base material layer; the third base material layer is positioned on the foaming layer; the surface adhesive layer is positioned on the third base material layer; wherein the surface rubber layer and the foaming layer comprise ethylene propylene diene monomer. According to the UV rubber cloth prepared by the invention, the surface rubber layer which is directly contacted with the printing ink contains the ethylene propylene diene monomer, so that the UV rubber cloth has excellent chemical corrosion resistance and water resistance, and can resist the corrosion of the UV printing ink and a UV printing ink cleaning agent; the foaming layer comprises ethylene propylene diene monomer rubber at 10kg/cm²The compression strength of the material is 0.16-0.22 mm, and the compression performance is excellent.

Description

UV rubber cloth and preparation method thereof

Technical Field

The invention belongs to the technical field of offset printing, and particularly relates to a UV rubber blanket and a preparation method thereof.

Background

UV blankets used in offset printing (offset printing) are blankets made of multiple base fabric layers and synthetic rubber which are calendared and laminated and which are wrapped around a transfer cylinder for transferring ink to the surface of a substrate (e.g., paper).

UV ink (ultraviolet curable ink) is an ink that undergoes an instantaneous photochemical reaction under irradiation of ultraviolet light of a certain wavelength to polymerize monomers in an ink vehicle into a polymer, thereby forming a film and drying the ink. The UV ink has the characteristics of high drying speed, good gloss, bright color, water resistance, solvent resistance, wear resistance and the like, and the proportion of the UV ink in the printing industry is continuously increased in recent years.

The UV ink and the cleaning agent for the UV ink are strong in corrosivity, and can cause the expansion of a common printing blanket, influence the stability of printing pressure and generate peeling or surface cracking in severe cases. UV offset printing therefore has extremely high requirements on the blanket, which must be selected to be compatible with the UV ink and its cleaning agents.

However, the existing UV printing blanket is mostly monopolized by countries such as Europe, America, Japan, and the like, and the domestic UV printing blanket can not meet the use requirement. Therefore, it is necessary to develop a UV printing blanket that satisfies the use requirements.

Disclosure of Invention

The invention aims to provide a UV rubber blanket and a preparation method thereof, which are suitable for UV printing through improving the formula and the process of the rubber blanket.

The invention firstly provides a UV blanket comprising at least:

a first base material layer;

the bonding layer is positioned on the first base material layer;

the second base material layer is positioned on the bonding layer;

the foaming layer is positioned on the second base material layer;

the third base material layer is positioned on the foaming layer;

the surface adhesive layer is positioned on the third base material layer;

wherein the surface rubber layer and the foaming layer comprise ethylene propylene diene monomer.

In an embodiment, the first substrate layer, the second substrate layer and the third substrate layer are cloth layers, and the thickness of the cloth layers is 0.43-0.47 mm.

In one embodiment, the thickness of the surface adhesive layer is 0.33-0.35 mm; the thickness of the foaming layer is 0.3-0.6 mm.

In one embodiment, the top glue layer comprises the following components: 50-150 parts by mass of ethylene propylene diene monomer, 50-150 parts by mass of reinforcing filler, 1-5 parts by mass of stearic acid, 3-15 parts by mass of zinc oxide, 5-25 parts by mass of paraffin oil, 0.5-3 parts by mass of sulfur and 2-20 parts by mass of accelerator.

In one embodiment, the Shore A hardness of the surface adhesive layer is 80-84 degrees.

In one embodiment, the foamed layer is at 10kg/cm²The compression performance is 0.16-0.22 mm under the pressure.

In one embodiment, the foamed layer comprises the following components: 80-150 parts by mass of ethylene propylene diene monomer, 5-30 parts by mass of foaming agent, 10-80 parts by mass of reinforcing agent, 5-20 parts by mass of plasticizer TP-90B, 5-20 parts by mass of black factice, 5-30 parts by mass of resin, 0.5-5 parts by mass of sulfur and 1.5-13 parts by mass of accelerator.

In one embodiment, the tacky tie layer comprises the following components: 100-300 parts of nitrile butadiene rubber, 10-70 parts of reinforcing agent, 5-20 parts of plasticizer TP-90B, 0.5-5 parts of sulfur and 0.3-5 parts of accelerator.

The invention also provides a preparation method of the UV rubber blanket, which comprises the following steps: the preparation method at least comprises the following steps:

first calendering, namely pressing the foaming layer on the second base material layer;

second calendering, namely pressing a third base material layer on the other side of the foaming layer;

thirdly, calendering, namely pressing the bonding layer on the other side of the second base material layer;

fourthly, calendering, and laminating a first base material layer on the other side of the bonding layer;

first-stage vulcanization;

fifth calendering, laminating the surface glue layer on the other side of the third base material;

vulcanizing at a second stage;

polishing, namely polishing the surface of the surface rubber layer to obtain a UV rubber cloth;

wherein the surface rubber layer and the foaming layer contain ethylene propylene diene monomer;

the calendering temperature of the first calendering, the third calendering and the fifth calendering is 60-80 ℃, and the calendering speed is 3-10 m/min;

the rolling temperature of the second rolling and the fourth rolling is 100-170 ℃, and the rolling speed is 5-15 m/min.

In one embodiment, the preparation method of the surface adhesive layer comprises the following steps:

mixing the raw materials of the surface rubber layer for the first time to obtain first mixed rubber;

mixing the first mixed rubber for the second time to obtain second mixed rubber;

filtering the second mixed rubber;

rolling the second mixed rubber after rubber filtration to obtain a surface rubber layer;

wherein the mixing temperature of the first mixing and the second mixing is 90-130 ℃, and the mixing time is 15-60 min.

In one embodiment, the method of preparing the foamed layer comprises:

pre-foaming a foaming agent in the foaming layer raw material to form microspheres;

mixing and mixing the microspheres and other components of the foaming layer to obtain foaming layer mixed rubber;

filtering the rubber mixed by the foaming layer;

calendering the rubber mixed in the foaming layer after rubber filtration to obtain a sheet, and obtaining the foaming layer;

wherein the temperature for pre-foaming the foaming agent is 75-200 ℃.

In one embodiment, the temperature of the first stage vulcanization and the second stage vulcanization is 120-180 ℃.

In one embodiment, the method of preparing the bonding layer comprises:

mixing the raw materials of the bonding layer to obtain bonding layer mixed rubber;

filtering the bonding layer mixed rubber;

and rolling the mixed rubber of the bonding layer after rubber filtration to obtain a bonding layer rubber.

According to the UV rubber blanket, the surface rubber layer rubber for transferring the printing ink is made of ethylene propylene diene monomer rubber, so that the surface rubber layer has excellent chemical corrosion resistance and water resistance, can resist the strong corrosion of the UV printing ink and the UV printing ink cleaning agent, and can prevent the UV printing ink and the UV printing ink cleaning agent from swelling the rubber blanket; and the Shore A hardness of the surface rubber layer of the UV rubber cloth is 80-84 degrees, the surface roughness Ra of the surface rubber layer is 0.6-0.8 mu m, the UV rubber cloth has larger hardness and smaller surface roughness, the problems of uneven thickness, surface corrugation and the like caused by uneven tension in grinding are solved, the surface roughness grade of a product is improved, the hardness and the wear resistance of the surface rubber layer are further improved, the mesh point of the surface rubber layer is clear, and the ink transfer effect is good.

According to the UV rubber cloth, the foaming layer is made of ethylene propylene diene monomer, and the UV rubber cloth is resistant to corrosion of UV ink and cleaning agents thereof; meanwhile, the foaming layer contains a microsphere structure with the diameter of 20-30 mu m, and the combination of the ethylene propylene diene monomer and the microsphere structure ensures that the foaming layer is 10kg/cm²The pressure intensity of the printing ink is 0.16-0.22 mm, the compression performance is excellent, the microsphere structure absorbs printing pressure in the printing process, the phenomenon that the surface of the rubber blanket forms 'bulges' to cause screen dot deformation is avoided, after the printing pressure is eliminated, gas in the microsphere can be quickly recovered, the pressure in the printing process is basically kept constant, the deformation of the surface layer of the rubber blanket is small, and the reducibility of printing screen dots is good.

Drawings

Figure 1 shows a schematic view of the UV blanket of the present invention in use.

Fig. 2 is a schematic structural diagram of a UV blanket according to an embodiment of the present invention.

Figure 3 shows a schematic flow diagram of a method of making the UV blanket of the present invention.

Figure 4 shows an exemplary block diagram of the UV blanket manufacturing apparatus of the present invention.

Detailed Description

Referring to fig. 1 and 4, embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.

As shown in fig. 1, a first aspect of the present invention provides a UV blanket 10, wherein the UV blanket 10 may be wrapped on a transfer cylinder 101 of a UV offset printing press 100, so that UV ink is directly transferred from the surface of the UV blanket 10 to a printing material 30 as a medium for ink transfer during offset printing (offset printing). Specifically, this can be achieved by a process including rotating a transfer cylinder 101 covered with the UV blanket 10 so as to be in close contact with a plate cylinder 102 on which characters and images are formed and printing ink is supplied, so that the characters and image ink on a plate 20 located at the plate cylinder 102 are transferred onto the UV blanket 10, and then the characters and images on the UV blanket 10 are transferred and positioned on a substrate 30 such as a paper sheet of a printing roller 103, which is conveyed in close contact with the UV blanket 10, to perform printing.

As shown in fig. 2, the UV blanket 10 provided by the invention includes, from bottom to top, a first substrate layer 6, a bonding layer 5, a second substrate layer 4, a foaming layer 3, a third substrate layer 2, and a surface adhesive layer 1, which are sequentially stacked. The UV blanket 10 is a multilayer laminate, the first base material layer 6 is an innermost layer, and is wrapped around the transfer cylinder 101 of the printing press 100, the size layer 1 is an outermost layer, and the ink on the printing plate 20 of the plate cylinder 102 is transferred to the printing material 30 by adhering to the size layer 1 of the UV blanket 10. Because the UV ink and the cleaning agent thereof have strong chemical corrosiveness, the main component of the surface rubber layer 1 of the UV rubber cloth 10 in direct contact with the UV ink comprises Ethylene Propylene Diene Monomer (EPDM) which lacks polarity and has low unsaturation degree based on the use in UV printing, so that the UV rubber cloth has good resistance to various polar chemicals such as alcohol, acid, alkali, oxidant, ketone, grease and the like, and has the characteristic of resisting the corrosion of the UV ink and the cleaning agent thereof.

The thickness of the UV blanket 10 is a distance from the lower surface of the first base material layer 6 forming the UV blanket 10 to the upper surface of the face adhesive layer 1, and is, for example, 1.8 to 2.5mm, and further 1.93 to 1.97mm, and is, for example, 1.95mm, and therefore the UV blanket 10 has a desirable strength and is not easily deformed. Further, the UV blanket 10 has a thickness variation of, for example, 0.03mm or less, for example, 0.01mm or 0.02 mm.

The UV blanket 10 has a Shore A hardness of, for example, 80-84 degrees, e.g., 80 degrees, 82 degrees, 84 degrees; has a tensile strength of 10MPa or more, further 15MPa or more, for example, 15MPa, 17MPa, 20 MPa; has an elongation of 2.0% or less, further 1.2% or less, such as 1.2%, 1.0%, 0.9%; and has a compressibility of 0.10 to 0.18mm, such as 0.20mm, 0.66mm, 0.1mm, and more specifically, in some embodiments, a compressibility of the UV blanket 10 of 0.12 to 0.24mm at a print load of 1000kPa, and a compressibility of the UV blanket 10 of 0.20 to 0.32mm at a print load of 2000kPa, for example. The interlayer adhesion force among the multiple layers of the UV rubber blanket 10 is more than or equal to 1.2Kg/mm, and further more than or equal to 1.5Kg/mm, and the surface roughness Ra of the UV rubber blanket 10 is 0.6-0.8 μm, such as 0.6 μm, 0.7 μm, and 0.8 μm.

First substrate layer 6, second substrate layer 4 and third substrate layer 2 can adopt the same or different structure and material, for example can select different fibre fabrics, fibre fabrics for example can be the plain weave cloth of being worked out by warp woof, the fibre can be natural fibre for example, any one or two in the synthetic fiber, natural fibre can be cotton fiber, cotton fiber can include long stapled cotton, fine staple cotton etc. because the radial atress of blanket is very big during the printing, is close 1000kg, consequently, further, UV blanket 10 can be preferred the higher worsted long stapled cotton of intensity as basic skeleton. The thickness of the first substrate layer 6, the second substrate layer 4 and the third substrate layer 2 can be 0.30-0.50 mm, such as 0.43mm, 0.45mm, 0.47 mm.

In some embodiments, the first substrate layer 6, the second substrate layer 4, and the third substrate layer 2 may be worsted long stapled cotton cloth, or may be a blended composition including long stapled cotton and fine stapled cotton, for example, may be a blended composition including long stapled cotton: the fine cotton wool comprises (1-3) of fine cotton wool by mass: 1, for example 1: the gram weight of the base material can be better controlled by controlling the mass ratio of the cellucotton, the cellucotton is energy-saving and environment-friendly, is easy to bond, and improves the affinity with rubber.

Referring to fig. 2, the first substrate layer 6 is a supporting framework of the UV blanket 10, and further, the first substrate layer 6 has a thickness of 0.3-0.45mm, such as 0.3mm, 0.35m, 0.40m, 0.45mm, from the viewpoint of ensuring that the UV blanket 10 has sufficient radial tensile strength and elongation as small as possible to obtain good applicability; having a cloth seam (i.e. a gap between the warp and the weft) of 0.03-0.8 mm, for example 0.04mm, 0.06mm, 0.069 mm; has a density of 200-400g/m²Gram weight of (2), e.g. 200g/m²、300g/m²、400g/m²(ii) a Has a radial strength of 70N/mm or more, for example, 70N/mm, 80N/mm, 100N/mm; and more importantly, the first substrate layer 6 has a radial elongation of 4.5% or less, e.g. 4.5%, 4%, and a constant load elongation of 1.4% or less, e.g. 1.4%, 1.3%. The first base material layer 6 within the above range is not elongated, is not broken, is not deformed, has a good affinity with the adhesive layer 5, is easily adhered, and is not easily detached, so that the first base material layer 6 can make the UV blanket 10 bear a radial stress of 500kg or more, further bear a radial stress of 1000kg without deformation, and has good compressibility and flexibility.

Referring to fig. 2, the second substrate layer 4 is disposed on the foaming layer 3, and the second substrate layer 4 may have the same structure as the first substrate 31, for example. The third substrate layer 2 can be, for example, a long-staple cotton cloth, a linen cloth, a non-woven cloth, etc., such as a worsted long-staple cotton cloth, further, has a thickness of 0.30-0.37mm, such as 0.30mm, 0.37mm, has a cloth gap (i.e., a gap between the warp yarn and the weft yarn) of 0.03 mm-0.8 mm, such as 0.04mm, 0.06mm, 0.069mm, has a thickness of 180-²Gram weight of (2), e.g. 200g/m²、220g/m²Having a radial strength of 70N/mm or more, for exampleSuch as 70N/mm, 80N/mm, 100N/mm; and more importantly, the third substrate layer 2 has a radial elongation of 4.5% or less, e.g. 4.5%, 4%, and a constant elongation of 1.4% or less, e.g. 1.4%, 1.3%. The third base material layer 2 within the above range may not be elongated, may not be broken, may not be deformed, has good affinity with the foaming layer 3 and the surface adhesive layer 1, may be easily bonded and may not easily come off, may suppress deformation of the UV blanket 10, and may improve tensile strength thereof.

Referring next to fig. 2, the size layer 1 is located on the third substrate layer 2, and the size layer 1 is used as the outermost layer of the UV blanket 10, directly contacts ink, and transfers it to a printing material. The surface of the size layer 11, i.e. the surface of the UV blanket 10, in some embodiments, the surface roughness Ra of the size layer 1 is 0.6-0.8 μm, such as 0.6 μm, 0.7 μm, 0.8 μm, from the viewpoint of obtaining the UV blanket 10 with properties of hardness, wear resistance, resistance to ink erosion, resistance to chemical corrosion, etc.; the variation in the unevenness is 0.03mm or less, further, for example, 0.02mm or less; the Shore A hardness is, for example, 80-84 degrees, such as 80 degrees, 82 degrees and 84 degrees.

Referring to fig. 2, the thickness of the surface adhesive layer 1 is, for example, 0.33mm to 0.35mm, for example, 0.33mm, 0.34mm, 0.35mm, when the surface adhesive layer 1 provided by the present invention is formed on the third substrate layer 2, the surface roughness Ra of the surface adhesive layer 1 is 0.6 to 0.8 μm, and the variation of the unevenness is less than or equal to 0.03mm, so as to avoid the texture structure of the third substrate 11 from being transferred to the printing material 103, which results in an undesirable printing effect.

Based on the application in UV printing, the main component of the surface rubber layer 1 which is directly contacted with UV ink comprises ethylene propylene diene monomer. The ethylene propylene diene rubber is a terpolymer of ethylene, propylene and non-conjugated diene, the diene has a special structure, when the copolymer reaction is carried out, only one double bond with large activity participates in the reaction, and the other double bond with smaller activity is remained on the copolymer molecular chain to become an unsaturated point for sulfur vulcanization. The ethylene propylene diene monomer main chain is saturated, and the property ensures that the ethylene propylene diene monomer main chain can resist heat, sunlight and ozone. Ethylene propylene diene monomer is non-polar and therefore resistant to polar solutions and chemicals, and has low water absorption. The water and chemical resistance properties of ethylene propylene diene monomer rubber enable the UV blanket 10 to withstand the corrosion of UV ink. Further, in some embodiments, the raw material components of the surface glue layer 1 include, for example, 50 to 150 parts by mass of ethylene propylene diene monomer, 50 to 150 parts by mass of a reinforcing filler, 1 to 5 parts by mass of stearic acid, 3 to 15 parts by mass of zinc oxide, 5 to 25 parts by mass of paraffin oil, 0.5 to 3 parts by mass of sulfur and 2 to 20 parts by mass of an accelerator.

In some embodiments of the present invention, the reinforcing filler is used to improve the mechanical properties and aging resistance of the surface adhesive layer 1, and reduce the cost. The reinforcing filler includes, for example, 5 to 20 parts by mass of white carbon, 25 to 70 parts by mass of clay, and 20 to 60 parts by mass of silica, and examples thereof include 10 parts by mass of white carbon, 40 parts by mass of clay, and 50 parts by mass of silica. The addition of the white carbon black can obviously improve the wear resistance and the rebound resilience of the rubber product.

The accelerator is added into the rubber material to promote the activation of the vulcanizing agent, so that the crosslinking reaction of the vulcanizing agent and rubber molecules is accelerated, and the effects of shortening the vulcanizing time and reducing the vulcanizing temperature are achieved. In some embodiments of the invention, the accelerator includes, for example, 0.5 to 3 parts by mass of DTDM, 0.5 to 3 parts by mass of PX, 0 to 2 parts by mass of TT, 0.5 to 5 parts by mass of DM, and 0.5 to 5 parts by mass of CBS, such as 1 part by mass of DTDM, 1 part by mass of PX, 2 parts by mass of DM, and 2 parts by mass of CBS.

In some embodiments of the present invention, the raw material composition of the top-coat layer 1 may further include a dispersing aid, such as WB212, in an amount of 1 to 10 parts by mass, such as 1 part, 3 parts, 7 parts, 10 parts, based on improvement of the dispersion uniformity of the top-coat layer rubber.

In some embodiments of the invention, the raw material composition of the surface rubber layer 1 may further include 1-10 parts by mass of a silane coupling agent Si-69, which not only can function as a coupling agent and an activator, but also has functions of a reinforcing agent and a vulcanizing agent in the surface rubber layer rubber.

In some embodiments of the present invention, the raw material components of the top-coat layer 1 may further include a colorant, and the colorant includes, for example, 1 to 5 parts by mass of fast scarlet and 1 to 10 parts by mass of titanium dioxide. In the rubber of the surface rubber layer, the titanium dioxide is used as a white colorant, and has the functions of reinforcement, aging resistance and filling, so that the rubber has better sun-proof performance, does not crack or change color, and has better extensibility and acid-base resistance.

The surface glue layer 1 can be obtained by mixing and vulcanizing the raw material components.

Referring to fig. 2, the foaming layer 3 is disposed on the second substrate layer 4, and the thickness of the foaming layer 2 is 0.3-0.6 mm, such as 0.3mm, 0.4mm, 0.5mm, and 0.6 mm. The interlayer adhesion between the first surface 201 and the second surface 202 of the foam layer 3 is, for example, 1.2 to 2.0kg/mm, such as 1.2kg/mm, 1.5kg/mm, 2.0 kg/mm. The foamed layer 3 has a microporous structure, and the microporous structure is, for example, a microsphere including a plurality of minute air cells, and the diameter of the microsphere is, for example, 20 to 30 μm. In general, the microsphere foamed layer is composed of microspheres, rubber, and additives, and the microspheres are pre-foamed by a foaming agent, for example. The rubber is ethylene propylene diene monomer rubber, and a foaming layer of the ethylene propylene diene monomer rubber is waterproof and resistant to chemical corrosion, and more importantly, the rubber has excellent compression performance, for example, the compressibility of the foaming layer is 0.16-0.22 mm under the pressure of 10kg/cm2, and based on the excellent compression performance of the foaming layer, the UV rubber blanket printing dot has good reducibility, and the printing speed can reach high-speed printing of 1.5 ten thousand prints.

Microspheres formed by a foaming agent are mixed in a sizing material, when gas in the microspheres is heated to expand, a plurality of closed micropores with the diameter of about 20-30 mu m are formed in the sizing material, and in the printing process, the micropores absorb printing pressure to avoid forming bulges on the surface of a rubber blanket and causing mesh point deformation. After the printing pressure is eliminated, the gas in the microsphere is recovered quickly, so that the pressure is kept constant basically in the printing process, the deformation of the surface layer of the rubber blanket is small, and the reducibility of printing dots is good.

Specifically, the raw material components of the foaming layer 3 include, for example, 80 to 150 parts by mass of ethylene propylene diene monomer, 5 to 30 parts by mass of a foaming agent, 10 to 80 parts by mass of a reinforcing agent, 5 to 20 parts by mass of a plasticizer TP-90B, 5 to 20 parts by mass of black paste, 5 to 30 parts by mass of a resin, 0.5 to 5 parts by mass of sulfur, and 1.5 to 13 parts by mass of an accelerator.

The foaming agent is used for pre-foaming to form a microsphere structure, in some embodiments, the foaming agent is, for example, a microsphere foaming agent, further, for example, foaming agent DU40 is a foaming agent with a core-shell structure, the outer shell is a thermoplastic acrylic resin polymer, the inner core is spherical plastic particles composed of alkane gas, and the volume can be rapidly expanded to dozens of times of the volume after heating, so that the foaming effect is achieved.

In some embodiments, the reinforcing agent includes, for example, 10 to 50 parts by mass of carbon black and 0 to 30 parts by mass of crumb rubber. The accelerator includes, for example, 0.5 to 3 parts by mass of DTDM, 0.5 to 3 parts by mass of PX, 0 to 2 parts by mass of TT, and 0.5 to 5 parts by mass of CBS, for example, 1 part by mass of DTDM, 1 part by mass of PX, 0.5 part by mass of TT, and 2 parts by mass of CBS.

In some embodiments, other adjuvants may also be included, such as 3 to 8 parts by mass of zinc oxide and 0.5 to 3 parts by mass of stearic acid. On one hand, zinc oxide reacts with stearic acid to form zinc soap, the solubility of the zinc oxide in the sizing material is improved, a complex is formed with the promotion of economy in the sizing material, and the complex reacts with sulfur to generate a strong vulcanizing agent, so that the vulcanization speed is improved; secondly, in the vulcanization and use processes of the rubber, H2S generated by the breakage of polysulfide bonds can accelerate the cracking of the rubber, and zinc oxide can react with the rubber to generate new cross-linking bonds to stabilize a vulcanization network, so that the aging resistance of the rubber is improved. For another example, a small amount of an antioxidant may be included, specifically, for example, 0.2 to 2 parts by mass of an antioxidant 2246.

Referring to fig. 2, the foaming layer 3 is located between the second substrate layer 4 and the third substrate layer 2, and the interlayer adhesion between the foaming layer 3 and the second substrate layer 4 and the third substrate layer 31 should be 1.2kg/mm or more, and further 1.5kN/m or more, so that the UV blanket 10 is prevented from being broken due to radial stress during use. Specifically, the foamed layer 3 in the above range can solve the balance between the adhesive force and the oozing.

Referring to fig. 2, the bonding layer 5 is used to bond the first substrate layer 6 and the second substrate layer 4. In some embodiments, the adhesive layer 5 is a albondoid layer, and the raw material components of the albondoid layer include, for example, 100 to 300 parts by mass of an acrylonitrile butadiene rubber, 10 to 70 parts by mass of a reinforcing agent, 5 to 20 parts by mass of a plasticizer TP-90B, 0.5 to 5 parts by mass of sulfur, 0.3 to 5 parts by mass of an accelerator, and 0.5 to 20 parts by mass of other additives. Further, the reinforcing agent includes, for example, one or more of white carbon, carbon black, clay, and silica, and is, for example, 50 parts by mass of white carbon. The accelerator includes, for example, 0 to 2 parts by mass of TT and 0.3 to 3 parts by mass of CBS. The other auxiliary agents include, for example, coupling agents such as silane coupling agent Si-69; the other auxiliary agents also comprise flame retardant auxiliary agents TCP, zinc oxide and/or stearic acid and antioxidants.

Referring next to fig. 3, a second aspect of the present invention also provides a method of making a UV blanket 10 as described above, including, but not limited to:

s1, preparing a surface glue layer, a foaming layer and a bonding layer;

s2, first calendering, laminating the foamed layer on a second substrate layer;

s3, performing secondary calendering, and laminating a third base material layer on the other side of the foaming layer;

-S4, third calendering, laminating the tie layer to the other side of said second substrate layer;

s5, fourth calendering, laminating the first substrate layer on the other side of the bonding layer;

s6, first stage vulcanization;

s7, fifth rolling, laminating a surface glue layer on the other side of the third substrate;

s8, second vulcanization stage;

s9, polishing the surface of the face rubber layer to obtain a UV rubber blanket;

in the above process, in the UV blanket 10, the top rubber layer and the foaming layer contain ethylene propylene diene monomer.

Referring to fig. 4, the method for preparing the UV blanket 10 may be implemented by, for example, a process of a manufacturing device C10, specifically, in some embodiments, the manufacturing device C10 includes a rubber mixing device C100, a rubber filtering device C200, a rolling device C300, a first vulcanizing device C400, a second vulcanizing device C500, and a grinding device C600, and the UV blanket 10 completes the preparation of the UV blanket 10 by the processes of rubber mixing, rubber filtering, first rolling, second rolling, third rolling, fourth rolling, first stage vulcanization, fifth rolling, second stage vulcanization, and grinding on the UV blanket 10 through the manufacturing device C10.

Referring to fig. 2 to 4, in step S1, the preparation of the rubber for the surface rubber layer includes the following steps:

s111, mixing and first mixing the raw materials of the surface rubber layer to obtain first mixed rubber;

s112, carrying out secondary mixing on the first mixed rubber to obtain second mixed rubber;

s113, filtering the second mixed rubber;

and S114, rolling the second mixed rubber after rubber filtration to obtain a rubber of the surface rubber layer.

In some embodiments, step S111 may be, for example, adding the raw material components of the dough layer 1, such as ethylene propylene diene monomer, white carbon black, china clay, silica, paraffin oil, sulfur, and the accelerator, the colorant, the silane coupling agent Si-69, and the dispersing aid WB212, weighed in advance, into a rubber mixing device C100, such as a pressurized kneader, and performing a first mixing at a mixing temperature of 90 to 130 ℃, such as 90 ℃, 110 ℃, 130 ℃, to obtain a first mixed rubber; the mixing time is 15-60 min, for example, 15min, 30min, 45 min. After a certain time interval, for example, 12 to 48 hours, and further, for example, 24 hours, the first kneaded rubber is subjected to a second kneading in step S112 to obtain a second kneaded rubber. The mixing temperature of the second mixing is 90-130 ℃, for example, 90 ℃, 110 ℃ and 130 ℃; the mixing time is 15-60 min, for example, 15min, 30min, 45 min. After the completion of the mixing, the second mixed rubber is filtered by, for example, a rubber filter C200, so that the rubber compound is dispersed more uniformly. The filtered second mixed rubber is subjected to the rolling of the step S114 to obtain the surface rubber layer 1, wherein the rolling is performed on a rolling device C300, for example, and the rolling temperature is 60 to 80 ℃, for example, 60 ℃, 70 ℃, 80 ℃ and the like; the calendering speed is 3-10 m/min, such as 3m/min, 5m/min, 8m/min, 10 m/min; the calendering rolls have a pitch of 0.05 to 5mm, e.g. 0.06mm, 0.08mm, 1mm, 3 mm.

In step S1, the preparation of the foamed layer rubber includes, for example, the steps of:

s121, pre-foaming a foaming agent in the raw materials of the surface glue layer to form microspheres;

s122, mixing and kneading the microspheres and other components of the foaming layer to obtain foaming layer kneaded rubber;

s123, filtering the rubber mixed with the foaming layer;

and S124, rolling the foamed layer mixed rubber after rubber filtration to obtain a sheet, thereby obtaining the foamed layer rubber.

In some embodiments, step S121 may be, for example, pre-foaming a blowing agent, such as blowing agent DU40, to form microspheres with a diameter of 20-30 μm. The pre-foaming temperature is 75 to 200 ℃, for example, 750 ℃, 100 ℃, 150 ℃, 200 ℃, etc. In step S122, for example, the microspheres and other components of the foamed layer such as ethylene propylene diene monomer, carbon black, crumb, zinc oxide and stearic acid, sulfur, accelerators DTDM, PX, and antioxidant 2246 are added to a rubber mixing apparatus C100 such as a pressure kneader and mixed to obtain a foamed layer mixed rubber. The mixing may be performed, for example, in two steps, with an interval of 12 to 24 hours between the two steps. The mixing temperature of each mixing is 50-90 ℃, for example, 50 ℃, 70 ℃ and 90 ℃; the time for each mixing is 15-60 min, such as 15min, 30min, 45 min. Step S123, for example, the rubber mixture of the foamed layer is filtered by the rubber filtering device C200, so that the rubber compound is dispersed more uniformly. Mixing the filtered foaming layer with rubber, and performing calendering in step S124, for example, on a calendering apparatus C300, to obtain a foamed layer 3, wherein the calendered sheet has a temperature of 60 to 80 ℃, for example, 60 ℃, 70 ℃, 80 ℃, or the like; the calendering speed is 3-10 m/min, such as 3m/min, 5m/min, 8m/min, 10 m/min; the calendering rolls have a pitch of 0.05 to 5mm, e.g. 0.06mm, 0.08mm, 1mm, 3 mm.

In step S1, the preparation of the tie layer rubber, for example, includes the steps of:

s131, mixing the raw materials of the bonding layer to obtain bonding layer mixed rubber;

s132, filtering the bonding layer mixed rubber;

and S133, rolling the filtered bonding layer mixed rubber to obtain a bonding layer rubber.

In some embodiments, step S131 is, for example, adding pre-weighed raw material components of the bonding layer, such as nitrile rubber, white carbon black, plasticizer TP-90B, sulfur, accelerators TT and CBS, and other additives, such as silane coupling agent Si-69, flame retardant additive TCP, zinc oxide and stearic acid, and antioxidant, into a rubber mixing device C100, such as a pressurized kneader, and mixing to obtain the bonding layer mixed rubber. The mixing time is 15-60 min, such as 15min, 30min and 45 min. Step S132, for example, the bonding layer mixed rubber is filtered by the rubber filtering device C200 to disperse the rubber compound more uniformly. Mixing the filtered adhesive layer with rubber, and performing calendering of step S124 on the sheet at 60 to 80 ℃, for example, 60 ℃, 70 ℃, 80 ℃ or the like, to obtain the adhesive layer 5; the calendering speed is 3-10 m/min, such as 3m/min, 5m/min, 8m/min, 10 m/min; the calendering rolls have a pitch of 0.05 to 5mm, e.g. 0.06mm, 0.08mm, 1mm, 3 mm.

In some embodiments, in step S2, a first calendering process is performed to press the foamed layer rubber on the second substrate layer 4. Will the material of second substrate layer 4 for example the long fine hair cotton of worsted cuts into required size, then will second substrate layer 4 with foaming layer rubber amalgamation together, adopts calendering equipment C300 to carry out the calendering, realizes the pressfitting of second substrate layer 4 and foaming layer rubber. The calendering temperature is 100-170 ℃, such as 120 ℃, 150 ℃, 162 ℃ and 170 ℃; the roller spacing is 0.05-5mm, e.g. 0.06mm, 0.08mm, 1mm, 3 mm; the calendering rate is from 5 to 15m/min, for example 6m/min, 8m/min, 10m/min, 12 m/min. Further, repeated pressing may be performed more times as necessary.

Referring to fig. 2 to 4, in the step S3, a second rolling process is performed to press a third substrate layer 2 on the other side of the foam layer 3. More specifically, a third base material layer 2 is attached to the other surface of the foaming layer 3 laminated with the second base material layer 4, the third base material layer 2 is, for example, worsted velveteen, and is calendered by, for example, calendering equipment C300, and parameters of the calendering equipment C300 in the laminating process are, for example, 100 to 170 ℃, such as 120 ℃, 150 ℃, 162 ℃ and 170 ℃; the roller spacing is 0.05-5mm, e.g. 0.06mm, 0.08mm, 1mm, 3 mm; the calendering rate is from 5 to 15m/min, for example 6m/min, 8m/min, 10m/min, 12 m/min.

Referring to fig. 2 to 4, in the step S4, a third rolling process is performed to press the adhesive layer 5 on the other side of the second substrate layer 4. Specifically, for example, the bonding layer 5 and the other side of the second substrate layer 4 are spliced, and then, for example, calendering is performed by calendering equipment C300, wherein parameters of the calendering equipment C300 in the laminating process are, for example, 100 to 170 ℃, such as 120 ℃, 150 ℃, 162 ℃ and 170 ℃; the roller spacing is 0.05-5mm, e.g. 0.06mm, 0.08mm, 1mm, 3 mm; the calendering rate is from 5 to 15m/min, for example 6m/min, 8m/min, 10m/min, 12 m/min.

Referring to fig. 2 to 4, in the step S5, a fourth calendering process is performed to laminate a first substrate layer 6 on the other side of the bonding layer 5, more specifically, to laminate the first substrate layer 6 on the side of the bonding layer 5 away from the second substrate layer 4, where the first substrate layer 6 is, for example, worsted plush cotton, and then is calendered, for example, by a calendering device C300, and parameters of the calendering device C300 during the lamination process are, for example, the temperature is 100 to 170 ℃, for example, 120 ℃, 150 ℃, 162 ℃, 170 ℃; the roller spacing is 0.05-5mm, e.g. 0.06mm, 0.08mm, 1mm, 3 mm; the calendering rate is from 5 to 15m/min, for example 6m/min, 8m/min, 10m/min, 12 m/min.

Referring to fig. 2 to 4, in the step S6, a first stage of vulcanization is performed to vulcanize the adhesive layer 5 and the foam layer 3, and the first stage of vulcanization is performed, for example, under an environment of 0 to 0.1kg, such as 0kg, 0.01kg, so as to cure the rubber of the foam layer 3 and the adhesive layer 5. Further, vulcanizing by adopting first vulcanizing equipment C400, wherein the vulcanizing temperature is 120-180 ℃, such as 120 ℃, 150 ℃ and 180 ℃; the vulcanization speed is 5 to 10m/h, for example, 5m/h, 7m/h, 8m/h, 10 m/h.

In the step S7, performing a fifth rolling process, and specifically, laminating the surface rubber layer 1 on the other side of the third substrate 11, for example, first splicing the surface rubber layer rubber and one side of the third substrate 2 away from the foaming layer 3, and then rolling by using a rolling device C300, for example, where the parameters of the rolling device C300 in the laminating process are, for example, the temperature is 100 to 170 ℃, such as 120 ℃, 150 ℃, 162 ℃, and 170 ℃; the roller spacing is 0.05-5mm, e.g. 0.06mm, 0.08mm, 1mm, 3 mm; the calendering rate is from 5 to 15m/min, for example 6m/min, 8m/min, 10m/min, 12 m/min.

In step S8, the second-stage vulcanization is a vulcanization of the facing adhesive layer 1, and the vulcanization is further performed under a light pressure environment, for example, under an environment of 0.5 to 3kg, for example, 1kg, 1.5kg, so that the foamed layer having a cellular structure is not broken by an excessive pressure. Vulcanizing by adopting second vulcanizing equipment C500, wherein the vulcanizing temperature is 120-180 ℃, such as 120 ℃, 150 ℃ and 180 ℃; the vulcanization speed is 5 to 10m/h, for example, 5m/h, 7m/h, 8m/h, 10 m/h.

Through the above process, the UV blanket 10 may be obtained.

Referring to fig. 1 to 4, in some embodiments, step S9 may be further included, in which the surface of the UV blanket 10 is ground, that is, the upper surface of the surface adhesive layer 1 is ground, for example, by using a grinding apparatus C600, such as a grinding machine, for example, a roller leather grinder, a stainless steel plate, a belt wood veneer grinder, etc., and the surface roughness, thickness, and unevenness of the UV blanket 10 are controlled within the above ranges.

Performance detection

Some examples and comparative examples listed above are listed below, wherein the formulations of the UV blankets of examples 1 to 3 and comparative example 1 are shown in table 1, and the UV blankets of examples 1 to 3 and comparative example 1 are subjected to performance tests, and the test results are shown in table 2.

Table 1 ingredients table for UV blankets of examples 1-3 and comparative example 1

Table 2 table of performance of UV blankets of examples 1-3 and comparative example 1

According to the UV rubber blanket, the surface rubber layer rubber for transferring the printing ink is made of ethylene propylene diene monomer rubber, so that the surface rubber layer has excellent chemical corrosion resistance and water resistance, can resist the strong corrosion of the UV printing ink and the UV printing ink cleaning agent, and can prevent the UV printing ink and the UV printing ink cleaning agent from swelling the rubber blanket; the foaming layer is made of ethylene propylene diene monomer, a microsphere structure with the diameter of 20-30 mu m is contained in the foaming layer, and the ethylene propylene diene monomer and the microsphere structure are combined, so that the foaming layer has excellent compression performance, the microsphere structure can absorb printing pressure in the printing process, the phenomenon that the surface of a rubber blanket forms a bulge to cause mesh point deformation is avoided, and after the printing pressure is eliminated, gas in the microsphere can be quickly recovered, so that the pressure in the printing process is basically kept constant, the deformation of the surface layer of the rubber blanket is small, and the reducibility of printing mesh points is good.

The invention effectively overcomes various defects in the prior art and has high industrial utilization value. The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. UV blanket, characterized in that it comprises at least:

a first base material layer;

the bonding layer is positioned on the first base material layer;

the second base material layer is positioned on the bonding layer;

the foaming layer is positioned on the second base material layer;

the third base material layer is positioned on the foaming layer;

the surface adhesive layer is positioned on the third base material layer;

2. UV blanket according to claim 1, wherein the size layer comprises the following components: 50-150 parts by mass of ethylene propylene diene monomer, 50-150 parts by mass of reinforcing filler, 1-5 parts by mass of stearic acid, 3-15 parts by mass of zinc oxide, 5-25 parts by mass of paraffin oil, 0.5-3 parts by mass of sulfur and 2-20 parts by mass of accelerator.

3. UV blanket according to claim 1, wherein the foamed layer comprises the following components: 80-150 parts by mass of ethylene propylene diene monomer, 5-30 parts by mass of foaming agent, 10-80 parts by mass of reinforcing agent, 5-20 parts by mass of plasticizer TP-90B, 5-20 parts by mass of black factice, 5-30 parts by mass of resin, 0.5-5 parts by mass of sulfur and 1.5-13 parts by mass of accelerator.

4. UV blanket according to claim 1, wherein said tacky tie layer comprises the following components: 100-300 parts of nitrile butadiene rubber, 10-70 parts of reinforcing agent, 5-20 parts of plasticizer TP-90B, 0.5-5 parts of sulfur and 0.3-5 parts of accelerator.

5. The UV blanket of claim 1, wherein the first, second and third substrate layers are cloth layers having a thickness of 0.3-0.5 mm.

6. The UV blanket of claim 1, wherein the thickness of the size layer is 0.33-0.35 mm; the thickness of the foaming layer is 0.3-0.6 mm.

7. A method for preparing a UV blanket, characterized in that the method at least comprises the following steps:

first-stage vulcanization;

vulcanizing at a second stage;

8. The method for preparing the surface adhesive layer according to claim 7, comprising the steps of:

filtering the second mixed rubber;

9. The method of claim 7, wherein the method of preparing the foamed layer comprises:

pre-foaming a foaming agent in the raw material of the foaming layer to form microspheres;

filtering the rubber mixed by the foaming layer;

wherein the temperature for pre-foaming the foaming agent is 75-200 ℃.

10. The method according to claim 7, wherein the temperature of the first-stage vulcanization and the second-stage vulcanization is 120 to 180 ℃.