阅读说明：本技术 一种pu树脂型耐磨丁腈橡胶及制备方法 (PU resin type wear-resistant nitrile rubber and preparation method thereof ) 是由 李国锋 谢金铎 张楠 李东霖 孙光任 于 2020-07-21 设计创作，主要内容包括：本发明的目的是为了进一步提高丁腈橡胶的耐磨性能,提供了一种PU树脂型耐磨丁腈橡胶及制备方法,属于丁腈橡胶技术领域。本发明丁腈橡胶各原料按质量份数为：丁腈橡胶100份,氧化锌22~27份,PU树脂10~20份,1,4-丁二醇8~13份,炭黑N220 22~27份,炭黑N550 18~23份,增塑剂 6~10份,防老剂MBZ 0.7~1.2份,硫化剂DCP 1.2~1.8份。本发明是在通用的丁腈橡胶配方基础上加入PU树脂,通过合理的配比改变了丁腈橡胶的硫化体系,使PU树脂分子链与丁腈橡胶的分子链发生共聚反应,从而提高了丁腈橡胶的耐磨性。(The invention aims to further improve the wear resistance of nitrile rubber, provides PU resin type wear-resistant nitrile rubber and a preparation method thereof, and belongs to the technical field of nitrile rubber. The nitrile rubber comprises the following raw materials in parts by weight: 100 parts of nitrile rubber, 22-27 parts of zinc oxide, 10-20 parts of PU resin, 8-13 parts of 1, 4-butanediol, 22022-27 parts of carbon black N, 18-23 parts of carbon black N550, 6-10 parts of plasticizer, 0.7-1.2 parts of antioxidant MBZ and 1.2-1.8 parts of vulcanizing agent DCP. The PU resin is added on the basis of a general nitrile rubber formula, and a vulcanization system of the nitrile rubber is changed through reasonable proportion, so that a PU resin molecular chain and a nitrile rubber molecular chain are subjected to copolymerization reaction, and the wear resistance of the nitrile rubber is improved.)

1. The PU resin type wear-resistant nitrile rubber is characterized by comprising the following raw material components in parts by weight:

100 portions of nitrile rubber

22-27 parts of zinc oxide

10-20 parts of PU resin

Carbon black N22022-27 parts

Carbon black N55018-23 parts

8-13 parts of 1, 4-butanediol

6-10 parts of plasticizer

0.7-1.2 parts of antioxidant MBZ

1.2-1.8 parts of vulcanizing agent DCP.

2. The PU resin type abrasion-resistant nitrile rubber according to claim 1, wherein the nitrile rubber is nitrile rubber 6280.

3. The PU resin type abrasion-resistant nitrile rubber according to claim 1, wherein the PU resin is a polyurethane resin D3145.

4. The abrasion-resistant nitrile rubber of the PU resin type according to claim 1, wherein the plasticizer is dioctyl terephthalate.

5. The process for preparing the PU resin type abrasion-resistant nitrile rubber according to any one of claims 1 to 4, wherein the raw materials are prepared according to the proportion of the formula, mixed by an internal mixer to prepare a sizing material, passed through an open mill for several times, pressed into a film and placed for 36 to 48 hours.

Technical Field

The invention belongs to the technical field of nitrile rubber, and particularly relates to PU resin type wear-resistant nitrile rubber and a preparation method thereof.

Background

The improvement of the wear resistance of the rubber roller is the aim of the rubber roller industry. Depending on the requirements of the product and the period of use of the product in actual production.

The nitrile rubber is a synthetic rubber prepared by copolymerizing butadiene and acrylonitrile, is mainly produced by a low-temperature emulsion polymerization method, and has the advantages of excellent oil resistance, higher wear resistance, better heat resistance and strong bonding force. The disadvantages are poor low temperature resistance, ozone resistance, poor insulation properties and slightly low elasticity. The rubber is widely used for manufacturing various oil-resistant rubber products, oil-resistant gaskets, sleeves, flexible packages, flexible rubber tubes, printing and dyeing rubber rollers, cable rubber materials and the like, and becomes an indispensable elastic material in the industries of automobiles, aviation, petroleum, copying and the like.

PU resin, code UR, is polymerized from polyester (or polyether) and diisocyanamide compounds. Its chemical structure is more complex than that of general elastic polymer, besides repeated carbamate groups, the molecular chain also contains ester group, ether group, aromatic group and other groups. The UR molecular main chains have the advantages of high hardness, good strength, high elasticity, high wear resistance, tear resistance, aging resistance, ozone resistance, radiation resistance, good conductivity and the like due to the acting force of hydrogen bonds, and are incomparable with common rubber.

Disclosure of Invention

The invention aims to further improve the wear resistance of nitrile rubber, and provides PU resin type wear-resistant nitrile rubber and a preparation method thereof. The PU resin is added on the basis of a general nitrile rubber formula, and a vulcanization system of the nitrile rubber is changed through reasonable proportion, so that a PU resin molecular chain and a nitrile rubber molecular chain are subjected to copolymerization reaction, and the wear resistance of the nitrile rubber is improved.

One of the technical schemes of the invention is that the PU resin type wear-resistant nitrile rubber comprises the following raw material components in parts by weight:

100 portions of nitrile rubber

22-27 parts of zinc oxide

10-20 parts of PU resin

Carbon black N22022-27 parts

Carbon black N55018-23 parts

8-13 parts of 1, 4-butanediol

6-10 parts of plasticizer

0.7-1.2 parts of antioxidant MBZ

1.2-1.8 parts of vulcanizing agent DCP.

Wherein the nitrile rubber is 6280;

the PU resin is polyurethane resin D3145; the physical and mechanical property detection result of the vulcanized PU resin is as follows: the hardness is 90-92 degrees (Shore hardness); the tensile strength is 50-55 MPa; the tearing strength is 90-100 KN/M; elongation at break of 200-³/1.6km；

The plasticizer is dioctyl terephthalate; after the plasticizer is added, the semi-finished rubber material is soft in texture, good in processing performance and smooth in extruded rubber strip, and the semi-finished rubber material can be recycled after secondary processing, so that the yield of the product is improved.

The second technical scheme of the invention is that the preparation method of the PU resin type wear-resistant nitrile rubber comprises the following steps:

preparing various raw materials according to the proportion of the formula, mixing and refining the raw materials by using an internal mixer to prepare a sizing material, performing thin pass for a plurality of times by using an open mill, pressing the sizing material into a rubber sheet, and standing the rubber sheet for 36-48 hours.

Compared with the prior art, the invention has the advantages that:

1. according to the invention, the vulcanization system of the nitrile rubber is changed through reasonable proportioning of the raw materials, so that the molecular chain of the PU resin and the molecular chain of the nitrile rubber are subjected to copolymerization reaction;

2. in the raw materials used in the invention, the adopted nitrile rubber can enable linear molecular chains to form three-dimensional reticular molecular chains in a short time at the temperature of below 120 ℃ in the vulcanization process, the cross-linking density of the product is increased after vulcanization, and various performance indexes of the product are superior to those of the product of a universal vulcanization system; the nitrile rubber prepared by adding the PU resin not only has higher wear resistance, but also can play a role of an operation aid in rubber materials, so that the rubber compound is convenient to process; the 1, 4-butanediol plays a role of a temporary plasticizer in the processing process and participates in the vulcanization effect in the vulcanization process, and the vulcanized rubber can be endowed with higher crosslinking density, so that the application of the 1, 4-butanediol not only can improve the processing performance of the nitrile rubber and the quality of products, but also can reduce or replace other auxiliary materials, such as: the usage amount of the softening agent, the accelerator and the carbon black, thus greatly reducing the cost on the use of raw materials;

3. the wear resistance of the nitrile rubber is greatly improved.

Detailed Description

Nitrile rubber 6280 in the following examples was purchased from LG of korea; polyurethane resin D3145 was purchased from norway polyurethane, inc, shandong; the plasticizer is dioctyl terephthalate (environment-friendly LF-30).