Composition for paper feed roll manufacture, paper feed roll and method of manufacture thereof

A manufacturing method and technology of paper feed rollers, applied in roads, instruments, traffic signals, etc., can solve problems such as mutual adhesion, and achieve the effects of excellent productivity, high compatibility, and excellent stability

Inactive Publication Date: 2011-01-26
NIPPON POLYURETHANE IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the case of obtaining a cured product with relatively low hardness (for example, JIS-A hardness of 40 to 70), stickiness on the surface of the molded product becomes a significant problem
[0012] Sticky molded products (rolls) cause problems such as mutual adhesion when they are stacked for storage

Method used

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  • Composition for paper feed roll manufacture, paper feed roll and method of manufacture thereof
  • Composition for paper feed roll manufacture, paper feed roll and method of manufacture thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0128] According to the formula described in the following table 1, in the reaction vessel replaced by nitrogen, add MDI type isocyanate and PTMG, by reacting at 80 ℃ for 4 hours, obtain the polyurethane prepolymer of NCO group termination (confirm the reaction by NCO content titration end), filling it into a storage container, replacing the space of the container with nitrogen gas, sealing and cooling to room temperature, thereby obtaining the main ingredient (A) [main ingredient (A-1)].

[0129] The NCO content and viscosity (75° C.) of the main ingredient (A-1) composed of an NCO group-terminated polyurethane prepolymer are shown together in Table 1 below.

preparation example 2～5

[0131] According to the formula in Table 1 below, in a nitrogen-substituted reaction vessel, add MDI-based isocyanate and PTMG, and react at 80°C for 4 hours to obtain an NCO-terminated polyurethane prepolymer (confirm the end of the reaction by NCO content titration) , add a plasticizer to it and stir and mix for about 1 hour, then fill it into a container, use nitrogen to replace the space in the container, and then seal it to obtain the main ingredient (A) [main ingredient (A-2)~ (A-5)].

[0132] Table 1 below shows the NCO content and viscosity (75° C.) of the main ingredients (A-2) to (A-5) each composed of an NCO group-terminated polyurethane prepolymer and a plasticizer.

[0133]

Preparation Example 1

Preparation example 2

Preparation example 3

Preparation Example 4

Preparation Example 5

Main agent (A)

A-1

A-2

A-...

Embodiment 1

[0142] According to the formula shown in the following table 2, long-chain diol (B1), short-chain diol (B2), short-chain triol (B3), catalyst (B4), heat-sensitive catalyst (B5) ) were mixed for 1 hour to prepare curing agent (B). Visual observation of the state of the curing agent (B) after preparation (liquid temperature = 60° C.) revealed a uniform state with no suspension and no phase separation. The obtained curing agent (B) was filled in a storage container, the space of the container was replaced with nitrogen gas, and then it was sealed and cooled to room temperature. Thus, the curing agent (B) is cured.

[0143] Then, the curing agent (B) was heated (reheated) to 60° C., and the state of the curing agent (B) thus melted was visually observed to reveal a homogeneous state without phase separation.

[0144] Next, the composition of the present invention was prepared by mixing the main ingredient (A-1) heated to 60° C. and the curing agent (B) (liquid temperature = 60° ...

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Abstract

The invention provides a thermosetting urethane elastomer composition which is excellent in the liquid stability of its hardener and is capable of manufacturing a paper feeding roll excellent in the mechanical properties and surface characteristics. The composition consists of (A) the chief agent containing an NCO group-terminated urethane prepolymer obtained by the reaction of an MDI (diphenylmethane diisocyanate)-based isocyanate and PTMG (polyoxytetramethylene glycol), having an NCO content of 5-15% and a viscosity at 75[deg.]C of 1,000 mm<SP>2< / SP> / s or less and of (B) a hardener containing (B1) a long chain diol comprising PTMG, (B2) a short chain diol containing 2-methyl-1,3-propanediol in a proportion of more than 50% by mass, (B3) a short-chain triol comprising the essential component of TMP (trimethylolpropane), (B4) a catalyst comprising DMI (1,2-dimethylimidazole) and (B5) a temperature-sensitive catalyst comprising a bicyclic tertiary diamine (salt), with a ratio of [(B1) / [(B2)+(B3)]] being 80 / 20-95 / 5 (by mass) and with a ratio of [(B2) / (B3)] being 55 / 45-95 / 5 (by mass).

Description

technical field [0001] The present invention relates to a composition for manufacturing a paper feed roller, a paper feed roller, and a manufacturing method thereof, and more particularly, to a thermosetting polyurethane elastomer composition for forming an elastic member of a paper feed roller, and a paper feed roller formed using the composition. Paper roll and manufacturing method thereof. Background technique [0002] As the elastic member (coating layer of the metal core) of the paper feed roller, a polyurethane elastomer is used (see Patent Documents 1 to 3). [0003] In the production method of the elastic member (polyurethane elastomer) of the paper feed roller, the prepolymer method is adopted from the viewpoint of avoiding the deterioration of the operating environment by using free monomers. In the prepolymer method, the main agent composed of NCO group-terminated polyurethane prepolymer is prepared by reacting isocyanate with long-chain polyols such as poly(tetr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/08C08G18/48C08G18/10B41J13/02
CPCC09D5/004E01F9/529G02B5/128
Inventor 国分徹也林达也后藤润二
Owner NIPPON POLYURETHANE IND CO LTD
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