摘要:
A method for the preservation of natural rubber latex is disclosed which comprises adding to natural rubber latex at least one hydrophobically modified saccharide in combination with at least one conventional preservative, preferably ammonia. The method enables increasing the stability of natural rubber latex by an economically interesting method which does not negatively affect neither subsequent conventional processing of the latex, nor the properties of shaped rubber articles manufactured from the stabilized latex. Furthermore, preserved rubber latex is disclosed that is stabilized by the method of the invention. Also preserved non-concentrated as well as concentrated rubber latex is disclosed comprising at least one said hydrophobically modified saccharide in combination with at least one conventional preservative, preferably ammonia.
摘要:
Method for the manufacture of latex products, like latex gloves etc., from a latex starting material which is mixed with particles which are capable to absorb and/or immobilize proteins present in the latex material, like charged crosslinked biopolymer particles. In addition, the latex products may comprise a powder layer of said particles, applied on the surface of the latex product.
摘要:
A method for producing rubber from a latex by spraying and drying a rubber latex or, in the case of a natural rubber latex, a natural rubber latex, to which a viscosity stabilizing agent has been added when necessary, under an atmosphere of a shock wave generated from pulse combustion.
摘要:
A process for producing a particle-enlarged latex, characterized by (1) causing (a) an anionic surfactant and (b) at least one surfactant selected from the group consisting of cationic surfactants and amphoteric surfactants to be present in a latex, (2) adding as a coagulant/enlarging agent at least one member selected from the group consisting of (i) an inorganic acid, (ii) an organic acid, (iii) a substance which yields an acid in water, (iv) a combination of two or more substances which react with each other to yield an acid, and (v) a substance which yields an acid upon irradiation with actinic rays to the latex in the presence of these surfactants, and (3) causing the acid attributable to the coagulant/enlarging agent to act on the latex to thereby increase the diameter of the particles in the latex; the particle-enlarged latex obtained; a graft copolymer obtained by polymerizing a polymerizable monomer with the particle-enlarged latex; and a resin composition comprising the graft copolymer and a thermoplastic resin.
摘要:
A process and apparatus for manufacturing crumb and powder rubber. The process and apparatus include a cooling step (12), effectuated by cooling means, wherein the temperature or cryogenically cooled preprocessed rubber particles is controlled. The process and apparatus also include a grinding step (20), effectuated by grinding means, in which degree of grinding, and thus the product particle size range, is controlled.
摘要:
Provided are a rubber latex used as a substrate for an impact modifier, a preparation method thereof, and an impact modifier prepared using the rubber latex. The rubber latex includes a rubber monomer as a main component and has a decreasing gel content from a core to a shell (s). The preparation method includes polymerizing a core followed by Polymerization of a shell (s) has a lower gel content that the core. The impact modifier is prepared by common graft polymerization using The rubber latex as a substrate. The rubber latex has a high gel content core and a low gel content shell (s), and thus, is free from problems involved In low or high gel content rubber particles. The rubber latex can be used As a substrate for a high efficiency impact modifier with high rubber Content and enhanced impact strength and processability.
摘要:
A method for producing a natural rubber master batch, which comprises a step for mixing a natural rubber latex with an aqueous slurry having been dispersed with at least one filler selected from the group consisting of carbon black, silica and an inorganic filler represented by the following Formula I:
nM 1 •xSiO y •zH 2 O (I)
wherein M 1 is at least one member selected from the group consisting of metals of aluminium, magnesium, titanium, calcium and zirconium, oxides of the preceding metals, hydroxides of the preceding metals, hydrates of the preceding oxides and hydroxides, and carbonates of the preceding metals; n is an integer of 1 to 5; x is an integer of 0 to 10; y is an integer of 2 to 5; and z is an integer of 0 to 10; wherein (i) the particle size distribution of the filler in the aqueous slurry is 25 µm or less in terms of a volume average particle size (mv) and 30 µm or less in terms of a 90 volume % particle size (D90), and (ii) a 24M4DBP absorption of dried filler recovered from the aqueous slurry is maintained at 93% or more of that of the filler before being dispersed into water.
摘要:
The present invention relates to a process for preparing polymer latex resin powder, and particularly to a process for preparing polymer latex resin powder comprising the steps of coagulating polymer latex and aging it, wherein the process comprises the step of introducing an emulsifier into polymer latex emulsion before coagulation. The polymer latex resin powder prepared by the present invention has 85 wt% or more of particles with diameter of 70~400 §-, each 10 wt% or less of fine powder with less than 70 §- and coarse powder with 400 §- or more, and it has superior bulk density and caking property.