Starch-(meth)actylate graft copolymer, oil-swellable material and oil-and water-swellable material comprising the same, and sealing articles and packers prepared from said swellable material

STARCH-(METH)ACRYLATE GRAFT COPOLYMER, OIL-SWELLABLE MATERIAL AND OIL-AND WATER-SWELLABLE MATERIAL COMPRISING THE SAME, AND SEALING ARTICLES AND PACKERS PREPARED FROM SAID SWELLABLE MATERIAL

The present invention provides a starch-(meth)acrylate graft copolymer and the preparation process thereof The starch-(meth)acrylate graft copolymer is prepared by copolymerizing (meth)acrylate monomer and starch in a weight ratio of (0.4~8):1, the graft copolymer having a skeleton of large starch molecule is grafted with one or more (meth)acrylate monomer with a grafting ratio of no less than 70%. The present invention further provides an oil swellable material, which comprises the starch-(meth)acrylate graft copolymer above as the swelling agent; and also an oil- and water-swellable material, which comprises the starch-(meth)acrylate graft copolymer above, water absorbing agent, reactive monomer, surfactant and material matrix. Further, sealing articles and packers prepared from the above oil swellable material and oil- and water-swellable material are also provided.

Starch-(meth)acrylate graft copolymer

Packer fixing ring and oil/water self-expandable packer with same

Starch-(meth)acrylate graft copolymer.

Method for determining molybdenum content through tabletting method-X-ray spectrum

The invention relates to a method for determining molybdenum content by a tabletting method-X-ray fluorescence spectrum, which has the characteristics of high accuracy, good precision, low detection limit and simple and efficient process, can well meet the requirements of rapid quantitative analysis of molybdenum ore samples with complex matrix composition, and improves the accuracy of molybdenum content detection. And the standard deviation of molybdenum ore analysis data is less than 1%.

Alkylamino pyridine high molecular catalyst and prepn. method thereof

The pyridine and poly addition monomer are used as main raw materials, through the preparation and connection of model compound and parent polymer, are formed into the cross-linked polymer with catalytic active group and adjustable hydrophobic group. Said invention not only reduces cost, but also solves the disadvantages of that said type small-molecular catalyst and linear macromolecule catalystare not to be separated from reaction system, and cann't repeatedly used. In the organic reactions of accelerated acylation and esterification, the invented product can be used as a substitute for DMAP commonly used in fine chemical industry.

Starch-(meth)acrylate graft copolymer, oil-swellable material and oil- and water-swellable material comprising the same, and sealing articles and packers prepared from said swellable material

The present invention provides a starch-(meth)acrylate graft copolymer and the preparation process thereof. The starch-(meth)acrylate graft copolymer is prepared by copolymerizing (meth)acrylate monomer and starch in a weight ratio of (0.48):1, the graft copolymer having a skeleton of large starch molecule is grafted with one or more (meth)acrylate monomer with a grafting ratio of no less than 70%. The present invention further provides an oil swellable material, which comprises the starch-(meth)acrylate graft copolymer above as the swelling agent; and also an oil- and water-swellable material, which comprises the starch-(meth)acrylate graft copolymer above, water absorbing agent, reactive monomer, surfactant and material matrix. Further, sealing articles and packers prepared from the above oil swellable material and oil- and water-swellable material are also provided.

Alkylamino pyridine high molecular catalyst and prepn. method thereof

Packer fixing ring and oil/water self-expandable packer with same

The invention relates to a packer fixing ring and a self-expandable packer with the same. The fixing ring is used for fixing the self-expandable packer sleeved on a base tube, and the packer is self-expandable in oil or water so as to seal a space to be sealed; the packer fixing ring comprises a main body part and a fixing part, wherein the main body part is used for being sleeved on the base tube; the fixing part is at least arranged at one end of the main body part and is used for being sleeved at the end part of the packer so as to fix the end part; and the length of the fixing part along an axial direction is equal to the length of the end part of the packer, that is to say, the length of the fixing part along the axial direction is larger than or equal to 1/2 of the maximum radial dimension between the outer wall of the packer and the space to be sealed. The packer comprises a main body part, a tapered section arranged at one end of the main body part, and a linear section arranged ...

Floating oil seal machining method

The invention discloses a floating oil seal machining method, and belongs to the field of part machining. Comprising the following steps that S1, a floating seal ring with a ring groove is obtained through machining; s2, molten glass is poured into the annular groove; and S3, quenching treatment is conducted on the poured glass, so that the sealing ring piece of the tempered glass/tempered glass modified structure is obtained in the ring groove. The floating oil seal machining method has the beneficial effects that the machined oil seal is not prone to corrosion, and the heat stability is high.

Magnetic separation device for laboratory

A magnetic separation device for a laboratory includes at least one magnetic separation tube having a head end, a middle end, a tail end, a first tube portion extending from the head end to the middle end, and a second tube portion extending from the tail end to the middle end. The second pipe part extends from the middle end to the tail end, and the head end and the tail end are both lower than the middle end, at least one electromagnet and at least one flushing device. The sample is allowed to be pushed from the head end of the magnetic separation tube to the tail end through the middle end and is flushed in the moving process from the head end to the middle end, upward flushing water flow is adopted, and the time for adsorbing the magnetic iron is prolonged.

Synthetic resin with high oil absorbency

The synthetic resin with high oil absorption is an absorption-controllable cross-linking polymer that is prepared by the chemical reaction of acrylic acid and its esters under the existance of cross-linking agent, disperser, disperser assistant, initiator, and disperse medium. It is in the form of powder.