JPH01282398A - Roll for calender - Google Patents

Abstract

PURPOSE:To obtain a resin-coated roll having excellent impact resistance and heat-resistance and having a hardness selectable over a wide range by forming a surface layer with a resin composed of a mutually incompatible thermosetting resin and a thermosetting elastomer in a finely dispersed state and hardening the surface layer. CONSTITUTION:A surface layer of a roll is formed of an incompatible resin mixture composed of mutually incompatible thermosetting resin and thermosetting elastomer, e.g., an isocyanurate resin and a polytetramethylene glycol(PTMG) urethane prepolymer, an (ester or ether) urethane resin and a polybutadiene elastomer, an epoxy resin and a PTMG-type urethane prepolymer, etc., in finely dispersed state. The formed surface layer is hardened by thermoset molding.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applied to a calendar roll mainly for the purpose of improving the gloss and smoothness of the surface of paper, magnetic tape, fiber, aluminum foil, etc. .

[Prior art and its problems 1] Generally speaking, the principle of a calendar (also called a supercalender) is that a metal roll with a mirror-like surface and an elastic roll are brought into contact with each other, and paper, etc. is placed between these rolls under high nip pressure. In addition, it is used to polish the surface of paper, etc. by running it, and the number of these metal rolls and elastic rolls can be increased or decreased depending on the purpose.

Such a calender roll is required to have the following characteristics.

(1) The surface of the roll must have good smoothness.

(2) Hardness, especially high surface height.

(3) Must have heat resistance.

(Must have compressive strength to withstand high nip pressure from metal rolls, and will not crack or break.

Rolls that meet these performance requirements include raw cotton, cotton, absorbent cotton, paper,
So-called cotton rolls, vapor rolls, woolen rolls, etc. made of wool etc. are commonly used.

Since rolls using these fibers are aggregates of fibers, their hardness is not uniform. Therefore, when actually used, a preliminary operation is performed to make the hardness of the roll surface uniform to some extent. A large amount of time is spent on making the surface hardness uniform.

Further, these rolls using fibers generate a large amount of internal heat during use, and if operated under high pressure and high speed rotation, the inside will burn and become unusable. Further, if an accident such as paper breakage occurs during operation, wrinkles will occur in the paper to be processed, and the paper will be calendered in a shape of several sheets. At this time, since the roll has poor restorability, paper marks remain on the roll surface and damage the paper that passes through it. Similarly, when wide paper is processed after narrow paper is processed, there is a problem in that the dents in the etched portions of the narrow paper directly affect the wide paper. Therefore, a number of spare rolls are prepared, and the rolls are replaced each time the paper width changes, and if scratches occur due to overlapping papers, the paper is polished again.

Additionally, rolls made of so-called thermoplastic monomer cast nylon are also used. When this polymerization reaction occurs, a huge amount of reaction heat is generated and the temperature becomes high.

In addition, molding shrinkage is large. Therefore, this roll has no choice but to adopt a method in which a resin hollow pipe is fitted directly onto the surface of the core metal or via an underlayer such as urethane rubber.

In the case of this roll, since the core metal or the lower layer and the resin layer are not bonded, it cannot withstand high-speed rotation under high pressure, and when the resin layer breaks, it scatters, causing damage to equipment and the risk of personal injury.

Conventionally, there has been a tendency to increase the hardness of calender rolls in order to improve the surface smoothness of processed objects.

However, due to the diversification of processed materials such as paper, in addition to crushing with a hard roll, there are cases where you want to crush only with a comparative terms roll to improve only surface smoothness or reduce hardness. Various demands have started to be made.

Furthermore, in order to reduce the hardness of a resin roll, a substance called a plasticizer, which is highly compatible with the resin used, is generally used. However, in general, when the hardness of a resin roll is lowered by such a treatment, at the same time, there is a problem that the properties of the resin, such as heat resistance and strength, are also impaired.

The present invention has been made in view of these points, and provides a calender that has excellent impact resistance and heat resistance, low hardness, a wide selection range of hardness values, and a surface layer that does not scatter when a roll breaks. It provides rolls for use.

[Means for Solving the Problems] The present invention provides an incompatible resin in which a liquid thermosetting elastomer that is incompatible with the thermosetting vIJrP# is microdispersed in a liquid thermosetting resin during molding. This is a calendar roll characterized by comprising a surface layer formed of.

Here, in the present invention, the elastomer in the thermosetting elastomer means one having a group capable of reacting with the terminal group of the resin monomer during the curing reaction of the thermosetting resin.

This allows the thermosetting elastomer to also react during the reaction of the thermosetting resin.

In addition, the reason for micro-dispersing thermosetting elastomers, which are poorly compatible with thermosetting resins, is to sufficiently reduce the hardness of the resin constituting the surface layer and not reduce heat resistance. This is to improve impact resistance.

It has been confirmed that when a thermosetting elastomer having good compatibility with the thermosetting resin is mixed, the heat resistance of the resin constituting the surface layer decreases. The hardness of the resin constituting the surface layer can be freely adjusted depending on the original hardness of the thermosetting elastomer and the amount mixed. Incidentally, the blending amount of the thermosetting elastomer is desirably set appropriately in the range of 5 to 50 parts by weight based on 100 parts by weight of the thermosetting resin. If it is less than 5 parts by weight, the effects of the present invention cannot be fully exhibited, and if it exceeds 50 parts by weight, the original properties of the base thermosetting resin are significantly impaired.

Specific examples of combinations of thermosetting resins and incompatible thermosetting elastomers include incyanurate resins, polytetramethylene glycol (PTMG)-based urethane prepolymers, and urethane resins (ester-based, ether-based). and polybutadiene elastomers, epoxy resins, and PTM G-based urethane prepolymers.

[Function] According to the calender roll according to the present invention, the surface layer is formed of an incompatible resin made by micro-dispersing a liquid thermosetting elastomer that is liquid during molding and is incompatible with the thermosetting elastomer. The impact resistance of the surface layer can be improved, the hardness value can be set at a low value over a wide range without reducing the heat resistance, and effects such as no scattering when the roll breaks can be exhibited.

[Example code] Examples of the present invention will be described below.

Example 1 The surface was blasted with adhesive (Conap 1146).
Prepare a casting mold that has an iron core coated with phenolic adhesive (trade name, Conap Inc.) passed through it.

Next, 100 parts by weight of Sunnix HD402, which had been dehydrated at a temperature of 120°C, and 50 parts by weight of PolyBDR45HT were put into a mixer, and 1 part by weight of Millionate MT was added thereto.
At the same time as 10 parts by weight of the mixture was added, 200 parts by weight of dried Crystallite A-1 (quartz powder, manufactured by Hitojiki Co., Ltd.) was added, and the mixture was stirred for 5 minutes under reduced pressure. This mixture is poured into the above casting mold and heated at 90'C for 15 hours to complete curing.The resulting cured product is taken out from the above mold, and the surface is polished by a conventional method, and the iron core is made of hard polyurethane resin. A calendar roll of Example 1 in which a layer was formed was obtained.

The above-mentioned Sannix HD402 is a polyether polyol manufactured by Sanyo Chemical Industries, Ltd., and has a hydroxyl value of 394.

Moreover, the above-mentioned Millionate MT is diphenylmethane diisocyanate manufactured by Nippon Polyurethane Industry ■,
Its NCO content is 33.6%.

In addition, the above-mentioned polyBD R745HT is a polybutane diene diol manufactured by Idemitsu Petrochemical Co., Ltd. and has a hydroxyl value of 4.
7.

Comparative Example 1 The surface was blasted and adhesive (Conap 1146
Prepare a casting mold that has an iron core coated with phenolic adhesive (trade name, ConaO Co., Ltd.) passed through it.

Next, 100 parts by weight of Sunnix HD402, which had been dehydrated at a temperature of 120°C, was put into a mixer, and 100 parts by weight of Millionate MT was added thereto, and at the same time, the dried Glistalite A-1 (made by , quartz powder)
200 parts by weight of was added and stirred for 5 minutes under reduced pressure. This mixture was poured into the above-mentioned casting mold and heated at 90°C for 5 hours to complete curing.The resulting cured product was taken out from the above-mentioned mold, and the surface was polished by a conventional method, and the iron core was made of hard polyurethane. A calendar roll of Comparative Example 1 on which a resin layer was formed was obtained.

Comparative Example 2 The surface was blasted and adhesive (Conap 1146
Prepare a casting mold that has an iron core coated with phenolic adhesive (trade name, Conap Inc.) passed through it.

Next, 100 parts by weight of SANNIX HD402, which had been dehydrated at a temperature of 120°C, and SANNIX FA708 were added.
Put 50 parts by weight of Millionate M into a mixer, and add Millionate M
At the same time as 125 parts by weight of T was added, 200 parts by weight of dried Crystallite A-1 (quartz powder, manufactured by Kakishiki Co., Ltd.) was added, and the mixture was stirred for 5 minutes under reduced pressure. This mixture was poured into the above-mentioned casting mold and heated at 90°C for 5 hours to complete curing.The resulting cured product was taken out from the above-mentioned mold, and the surface was polished by a conventional method, and the iron core was made of hard polyurethane. A calendar roll on which a resin layer was formed was obtained.

In addition, the above-mentioned Sunnix FA708 is a polyether polyol manufactured by Sanyo Chemical Industries@, and its hydroxyl value is 55.

Next, the results of a roll rotation test conducted on the calender rolls of Example 1, Comparative Example 1, and Comparative Example 2 are shown in Table 1 below. The material of Comparative Example 1 is a resin that does not contain a thermosetting elastomer, and the material of Comparative Example 2 is a blend of a urethane resin and a compatible thermosetting elastomer.

Here, the roll for the calendar for the test is 16
0IIIlIφ×140IuIφX200+vmj, and the metal roll on the other side that comes into contact with this is 300
It should be φX300 aunj.

Table 1 'ITg: Tg is the peak value of complex modulus G'' measured by a viscoelastic spectrometer.

(Temperature increase rate 2℃/lin, frequency 10.0Hz>'2
@ (Cold crack: 3 bacteria scratches on the roll surface - 130
It was stored at ℃ and observed for crack growth.

O means no growth × means cracks grow Example 2 The surface was blasted and adhesive (Conap 1146
゜CQnaD Co., Ltd. (trade name, phenolic adhesive) is coated with an iron core penetrated into a casting mold.

Next, 70 parts by weight of Coronate EH1 (trade name, Incyanate, manufactured by Nippon Polyurethane Industry ■) heated to a temperature of 60°C and Sunglen P-632 melted to a temperature of 80°C.
(30 parts by weight of PTMG-based incyanate prepolymer manufactured by Sanyo Chemical Industries, Ltd.), and 49 parts by weight of 4,4'-methylenebis(2-chloroaniline) heated and melted at 120°C.
．． 6 parts by weight were mixed and stirred for 3 minutes under reduced pressure. This mixture is poured into the above-mentioned casting mold, heated at 120°C for 4 hours to complete curing, the resulting cured product is taken out from the mold, and the surface is polished by a conventional method.
A calendar roll of Example 2 in which a resin layer was formed on the iron core was obtained.

Comparative Example 3 The surface was subjected to one last treatment and adhesive (Conao 11.4
Prepare a casting mold that has an iron core coated with i3゜C0naD Co., Ltd. (trade name, phenol-based glue) passed through it.

Next, 1% of Coronate EH1 (trade name: Incyanate, manufactured by Nippon Polyurethane Industries) was heated to 60°C.
49.6 parts by weight of 4,4'-methylenebis(2-chloroaniline) heated and melted at 20 DEG C. were mixed and stirred for 3 minutes under reduced pressure. This mixture was poured into the above-mentioned casting mold, heated at 120°C for 4 hours to complete hardening, and the resulting cured product was taken out of the mold, and the surface was polished by a conventional method. Comparative example 3 in which a resin layer was formed on
Get a calendar roll.

Comparative Example 4 The surface was blasted and adhesive (Conap 1146
A casting mold with an iron core coated with phenolic adhesive ML (trade name, Conap) is prepared.

Next, Coronate EH1 (manufactured by Nippon Polyurethane Industries ■, trade name Incyanate) 70 was heated to a temperature of 60°C.
Parts by weight and Coronate 4090 melted at a temperature of 80°C
(Japan Polyurethane Industries ■Product name PTM G-based incyanate prepolymer) 30 parts by weight, and 120°
51.6 parts by weight of 4,4'-methylenebis(2-chloroaniline) heated and melted in C were mixed and stirred for 3 minutes under reduced pressure. Pour this mixture into the above-mentioned casting mold, and
Curing was completed by heating at 20°C for 4 hours, the resulting cured product was taken out of the mold, and the surface was polished by a conventional method to obtain a calendar roll of Comparative Example 4 with a resin layer formed on the iron core. Ta.

Next, the results of the roll rotation test conducted on the calender rolls of Example 2, Comparative Example 3, and Comparative Example 4 are shown in Table 1 below. The material of Comparative Example 4 is a blend of isocyanurate resin and a compatible thermosetting elastomer.

Here, the test calendar rolls are all 16
0mmφX 14.0mmφX200Hj, and the mating metal roll that comes into contact with this is 300mm
The diameter was φX300m+nj.

Table 2 Example 3 Preparing a casting mold with a toecap whose surface has been blasted and coated with adhesive is penetrated 1st Step 8
Epoxy resin base material TA-1201E, temperature controlled to 0″C
(Sanyo Chemical Industries Co., Ltd. product name, epoxy) 100
Heavy! Part, epoxy resin curing agent TA-1201H (Sanyo Kasei Kogyo Co., Ltd. (trade name, amine >93 weight f), part, Sunbren P-663L (Sanyo Kasei Kogyo Co., Ltd. trade name, urethane prepolymer) 20 parts by weight, Glistalite A-
80 parts by weight of 1 (Material C) layoff, quartz powder) was put into a mixer and stirred for 10 minutes under reduced pressure. Pour this mixture into the above-mentioned casting mold preheated to 80°C.
Heat cured at 0°C for 14 hours, then 160'
The product was heated under conditions of C54 hours to complete curing, and the resulting cured product was taken out of the mold and surface polished by a conventional method to obtain a roll for a calendar of Example 3, in which an epoxy resin layer was formed on the iron core. .

Comparative Example 5 Prepare a casting mold that cannot penetrate an iron core whose surface is blasted and coated with adhesive.
Epoxy resin base material TA-1201E (
Sanyo Chemical Industry C Co., Ltd.) Product name, epoxy) 100
Weight part, epoxy! ! I fat curing 1JTA-1201H (
Sanyo Kakogyo (a-) Trade name, amine) 93 parts by weight, Crystallite A-1 (missed), quartz powder) 8
0 parts by weight was put into a mixer and stirred for 10 minutes under reduced pressure. This mixture was poured into the above-mentioned casting mold preheated to 80°C and cured by heating at 80°C for 14 hours, and then heated at 160°C for 54 hours to complete curing, resulting in a cured product. was taken out from the mold and surface polished by a conventional method to obtain a calendar roll of Comparative Example 5 in which an epoxy resin layer was formed on the iron core.

Next, the results of the roll rotation test conducted on the calender rolls of Example 3 and Example 2 are shown in Table 1 below. The resin of Comparative Example 5 is an epoxy resin that does not contain a thermosetting elastomer. be.

Here, the test calendar rolls are all 16
0111111 φ x 140 city φ x 200 square 1, and the metal roll on the other side that comes into contact with this is 300 m 5 I
φXb Margin below Table 3 [Effects of the invention] As explained above, Examples 1 to 1 shown in Tables 1 to 3
As is clear from the test results of 3 and Comparative Examples 1 to 5, the present invention has excellent impact resistance and heat resistance, and has low hardness and a wide range of hardness values to choose from. A calendar roll having a surface layer that does not scatter can be easily provided.

Applicant's agent: Patent attorney Takehiko Suzue

Claims (1)

[Claims] A thermosetting resin that is liquid during molding is provided with a surface layer formed of an incompatible resin in which a liquid thermosetting elastomer that is incompatible with the thermosetting resin is microdispersed. Roll for calendar.