324 results about "Viscosity modifier" patented technology

The invention discloses an ultra-high performance concrete material for a bridge structure as well as a preparation method and application thereof, and particularly relates to the field of concrete. The ultrahigh-performance concrete material for the bridge structure is prepared from the following raw materials in parts by weight: 230 to 240 parts of cement, 140 to 150 parts of fly ash, 50 to 60 parts of silica fume, 250 to 260 parts of fine aggregate, 50 to 60 parts of coarse aggregate, 5 to 9 parts of water reducing agent, 80 to 90 parts of steel fiber, 0.03 to 0.08 part of modified graphene, 3 to 5 parts of expanding agent, 1 to 3 parts of viscosity modifier and 70 to 80 parts of water. According to the prepared ultrahigh-performance concrete material for the bridge structure, the viscosity of the ultrahigh-performance concrete is improved, the compressive strength, the breaking strength, the tensile strength and other properties of the ultrahigh-performance concrete are improved, and the application prospect of the ultrahigh-performance concrete material in the concrete for the bridge is expanded.

A marker composition for application to a medical device or a surface is disclosed. The marker composition comprises a carrier composition including water, nonionic surfactant, organic solvent, and a neutral or anionic viscosity modifier. The marker composition further comprises a dyestuff. In some embodiments, the quantity of dyestuff present is such that at least some of the dyestuff is present as a dispersed solid phase. The dyestuff may be a naturally-derived dyestuff, such as spirulina extract (including phycocyanin). The invention extends to a carrier composition for a dyestuff.

The invention relates to the technical field of ink-jet printing, and discloses reactive dye ink-jet printing ink based on ionic association regulation and a printing method of the reactive dye ink-jet printing ink. According to the method, on the basis of a cationic compound with the relative molecular weight of 50-1000 in an ink system, the aggregate structure of the anionic surfactant is accurately induced to be controllably converted from a spherical structure to a wormlike or layered structure by virtue of the action of ionic bonds; under the action of not additionally adding a viscosity modifier, the rheological property and dynamic surface tension of reactive dye ink are accurately regulated and controlled, and the dynamic surface tension response rate is remarkably improved, so that the uniformity and stability of the morphology of ink droplets in inkjet printing are improved, the dynamic wetting behavior in the collision process of the ink droplets and a base material is effectively improved, and the printing quality is improved. And high-precision ink-jet printing of the reactive dye ink on the textile fabric is realized.

The invention discloses a water-based paint of polydopamine modified acrylic resin and a preparation process of the water-based paint, and belongs to the technical field of water-based paint preparation. The water-based paint of the polydopamine modified acrylic resin is prepared from the following components in parts by weight: 30 to 40 parts of a mixed solvent, 1 to 5 parts of modified polydopamine, 12 to 28 parts of a modified viscosity agent, 15 to 25 parts of an acrylic monomer, 0.2 to 1 part of an initiator, 0.8 to 1 part of an emulsifier, 1 to 5 parts of a pH regulator and 60 to 70 parts of deionized water. The water-based paint prepared by the method has excellent adhesion, stability and mechanical properties.

To provide an environmentally friendly fire retardant thermal insulation paint, excellent in adhesiveness of a coating, difficult to fall off, and having relatively high fire retardancy, thermal insulation and crack resistance and a producing method thereof.SOLUTION: A fire-retardant thermal insulation paint is produced from raw materials composed, by weight percentage, of 8 to 15% styrene-acrylic emulsion, 10 to 18% adhesion promoter, 10 to 20% thermal insulation agent, 20 to 30% fire retardant, 2 to 5% wetting dispersant, 3 to 6% viscosity modifier, 4 to 9% other additives, and the remainder water. The producing method is as follows: In step S1, the viscosity modifier and water are mixed to prepare a mixed solution; in step S2, the adhesion promoter and wetting dispersant are mixed with the mixed solution to prepare a dispersion; in step S3, the fire retardant is mixed with the dispersion to prepare a flame-retardant dispersion; and in step S4, the styrene-acrylic emulsion, thermal insulation agent, and other additives are mixed with the fire-retardant dispersion.SELECTED DRAWING: None

The invention relates to the technical field of tailing concrete poles, in particular to a prestressed tailing concrete pole and a manufacturing method thereof, and the prestressed tailing concrete pole comprises the following components in parts by mass: 550-600 parts of modified iron tailings, 180-200 parts of a prestressed modifier, 500-600 parts of slag, 30-45 parts of silica fume, 180-200 parts of fly ash, 6-8 parts of a polycarboxylate superplasticizer, 5-10 parts of a viscosity modifier and 5-10 parts of an auxiliary enhancer. Through the synergistic effect of the prestress modifier, the viscosity modifier and the modified iron tailings, bleeding and segregation of the high-volume tailing concrete in the vibrating process are prevented, the homogeneity of the material is ensured, the formed electric pole has extremely high internal compactness and a smooth surface, and therefore the freeze-thaw resistance and durability of the electric pole are greatly improved. The modified iron tailings are used for replacing part of traditional cementing materials and aggregates, so that the production cost is remarkably reduced, extremely high additional value is given to industrial solid wastes, the problems of environmental risk and land occupation caused by stockpiling of the industrial solid wastes are solved, and the national green development strategy is met.

The invention is suitable for the technical field of detergents, and provides a solid detergent tablet and a preparation method and a using method thereof.The solid detergent tablet comprises a base material and a viscosity modifier, and the viscosity modifier comprises at least one or combination of cellulose ether and inverse emulsion. By adding the viscosity modifier, the viscosity of the finally obtained washing liquid can be adjusted, and the use requirements of consumers are met; the sheet is obtained after drying, then the viscosity modifier powder particles are added, on one hand, the process difficulty is not increased, and on the other hand, the viscosity modifier is added, so that the product becomes thicker after being dissolved, and the customer experience feeling is better.

The invention discloses a furyl polyamide lithium battery diaphragm and a preparation method thereof, and belongs to the technical field of lithium battery diaphragms.The preparation method of the diaphragm comprises the following steps that S1, furyl polyamide, polyvinylidene fluoride and modified inorganic filler are added into a solvent and stirred and mixed, and a mixed solution is obtained; s2, adding a viscosity modifier into the mixed solution, and stirring and mixing to obtain coating slurry; s3, coating one side of a base membrane with the coating slurry, and performing vacuum drying to obtain the furyl polyamide lithium battery diaphragm, the coating slurry is prepared from the following raw materials in parts by weight: 15 to 30 parts of polyvinylidene fluoride, 25 to 50 parts of furyl polyamide, 10 to 30 parts of modified inorganic filler, 5 to 10 parts of viscosity modifier and 100 parts of solvent; the lithium battery diaphragm prepared from the coating slurry not only has excellent heat resistance, but also has good wettability, the cycle and power performance of the battery can be effectively improved, and the safety performance such as thermal runaway of the battery is improved.

The invention discloses self-compacting concrete and a preparation method thereof, and belongs to the technical field of concrete.The self-compacting concrete is prepared from, by mass, 310-320 parts of cement, 75-85 parts of fly ash, 100-110 parts of mineral powder, 830-850 parts of machine-made sand, 770-790 parts of milling material coarse aggregate, 35-40 parts of steel fiber, 8-12 parts of rubber fiber, 25-30 parts of viscosity modifier, 175-180 parts of water and 7.5-8 parts of polycarboxylic acid type water reducer. According to the self-compacting concrete and the preparation method thereof, the coarse aggregate is prepared by virtue of the rubber fibers, the steel fibers, the viscosity modifier, the machine-made sand and the milling material, so that the problems that the existing self-compacting concrete is insufficient in impact resistance, the rubber component easily floats upwards, and greenization and high performance are difficult to consider at the same time are solved.

Marker composition comprising water, 1-10 wt.% non-ionic surfactant selected from alkyl polyglucosides, alcohol ethoxylates and alcohol ethoxylate propoxylates, or mixtures thereof, 1-5% organic solve

The invention belongs to the field of daily chemicals, and particularly relates to a body cleaning composition containing folium artemisiae argyi extract and a preparation method of the body cleaning composition. 14%-20% of a surfactant; 0.5-5% of a skin conditioner; 0.01%-0.1% of a metal chelating agent; 0.01%-1.2% of a preservative; 0.01%-1% of a pH regulator; 1 to 1.5 percent of flavoring agent; 0.01%-1% of a viscosity modifier; and the balance of deionized water. The plant functional composition comprises a folium artemisiae argyi extract and a rosa canina fruit extract. The folium artemisiae argyi extract and the rosa canina fruit extract in the composition can achieve a synergistic effect, free radicals can be effectively removed, release of cell factors and inflammatory mediators can be inhibited, and the composition has anti-inflammatory and soothing effects, can relieve uncomfortable symptoms such as skin redness and itching and has a certain whitening effect.

The invention discloses a lithium titanate battery, and relates to the technical field of batteries. The battery comprises a positive electrode, a negative electrode, an electrolyte and a diaphragm, and an addition product synthesized by dimethyl fumarate and benzidine according to a specific molar ratio is added into the electrolyte as a viscosity modifier, so that the viscosity increasing trend of the electrolyte at a low temperature is effectively reduced, and the migration rate of lithium ions is improved. And the electrolyte also comprises a lithium salt, an organic solvent and an auxiliary additive, so that the low-temperature performance and the cycling stability of the battery are favorably optimized. A positive active material is one or more of lithium iron phosphate, lithium manganate, lithium cobalt oxide or nickel manganese cobalt ternary materials, a negative active material is lithium titanate, and additives such as lithium nitrate and fluoroethylene carbonate are further combined, so that the capacity retention ratio and the charge-discharge efficiency of the battery in an extreme low-temperature environment of-40 DEG C are remarkably improved. The lithium titanate battery provided by the invention has excellent low-temperature adaptability, safety and long cycle life, and is applicable to power batteries and energy storage systems in alpine regions.

The invention provides a hot melt adhesive and a preparation method thereof, and relates to the technical field of adhesives. According to the hot melt adhesive, amorphous polyolefin (APAO) is used as a main body, ethylene-vinyl acetate copolymer (EVA) is added as a compatilizer, and Fischer-Tropsch wax is used as a viscosity modifier. The preparation method comprises the following steps: firstly synthesizing a dopamine functional polymer, and then carrying out melt blending on the dopamine functional polymer, APAO, EVA, tackifying resin and other components so as to stably introduce a catechol group into a hot melt adhesive system. When the hot melt adhesive is bonded with a metal surface, the catechol group can form a firm coordinate bond with metal ions, so that the adhesive force is greatly improved. The product provided by the invention has high adhesive force, excellent flexibility, good compatibility and construction performance, and is suitable for bonding and sealing metal materials.

Generally speaking, this invention relates to hierarchical composites or delivery systems that are used to improve the performance of sealants, coatings, composites, adhesives, and other polymeric products. Hierarchical composites are materials that combine multiple types of structures at different scales to achieve enhanced properties and performance in such compositions. Expressly, but not limited to, the hierarchal composites carrying layers filled with, or otherwise, of nanomaterials, dyes, explosives, catalysts, metals, viscosity modifiers, thickeners, rheology modifiers, toughening agents, and like structures for the benefit of improved physical, chemical, electrical, conductive, color, rheological or other like properties minimizing or reducing for example, the need for more significant amounts of said materials.

The present invention relates to a bridge surface waterproofing method having excellent waterproofness and constructability. The present invention provides a bridge surface waterproofing method comprising the steps of: evenly preparing the surface of a bridge surface; forming a primer layer on the surface of the bridge surface; forming a waterproofing layer that is from 2 mm to 4 mm by applying a bridge surface waterproofing agent composition onto the primer layer so that the waterproofing layer is inclined in a specific direction of the bridge surface; and forming an asphalt layer on the waterproofing layer, wherein the bridge surface waterproofing agent composition comprises 40 to 60 wt% of asphalt, 5 to 10 wt% of styrene butadiene styrene, 5 to 10 wt% of ethylene glycol dimethacrylate, 3 to 5 wt% of octamethylcyclotetrasiloxane, 5 to 10 wt% of silica particles having an average particle diameter of 200 to 400 nm, 5 to 10 wt% of silica particles having an average particle diameter of 700 to 1000 nm, 3 to 8 wt% of methyl methacrylate, 1 to 3 wt% of 4-hydroxy-3-methoxybenzoic acid, 5 to 10 wt% of a fiber reinforcing material, 1 to 3 wt% of a dispersant, 1 to 3 wt% of a viscosity modifier, and 1 to 3 wt% of a tackifier.

The present disclosure relates to a rubber composition and a method of preparing the same, the rubber composition comprising a viscosity modifier and a modified polymer having a structure in which a molecular weight regulator is coupled to at least one of both ends of an at least partially hydrogenated or non-hydrogenated petroleum resin. The rubber composition according to the present disclosure has improved processability and thus may replace process oil, and may markedly improve gas impermeability.

The application discloses a high-viscosity recycled asphalt mortar based on oil-rich RAP fine materials and a preparation method thereof, and belongs to the technical field of highway engineering materials. The high-viscosity recycled asphalt mortar comprises the following components: oil-rich RAP fine materials, base asphalt, a high-viscosity modifier, a recycling agent and a dissolving agent. The high-viscosity modifier comprises the following components: waste tire rubber powder grafted with GMA (glycidyl methacrylate), BMI (bismaleimide), an adhesive, isooctanol polyoxyethylene ether and sulfur. The waste tire rubber powder grafted with GMA can improve the interfacial bonding strength of the oil-rich RAP fine materials and the base asphalt, thereby improving the water damage resistance of the recycled asphalt mixture. The BMI forms an interpenetrating structure (crosslinking network) among the rubber powder, the oil-rich RAP fine materials and the base asphalt, thereby improving the crack resistance of the recycled asphalt mixture.

The application discloses an electrolyte-resistant double-sided adhesive tape with an acrylic ultrathin substrate, which comprises, in sequence, a pressure-sensitive adhesive layer, a substrate layer and a hot melt adhesive layer; the substrate layer has a thickness of 0.2-1 microns; the pressure-sensitive adhesive layer has a thickness of 3.5-6.5 microns and comprises an alpha-olefin polymer, a modified polyolefin, a styrene block copolymer, a petroleum resin and a viscosity regulator; and the hot melt adhesive layer has a thickness of 3.5-6.5 microns and comprises an alpha-olefin polymer, a modified polyolefin, a styrene block copolymer and a petroleum resin. The application further provides a preparation method of the electrolyte-resistant double-sided multilayer adhesive tape with the ultrathin substrate, which comprises, in sequence, hot melt adhesive layer coating, substrate layer coating and pressure-sensitive adhesive layer coating. The multilayer adhesive tape has a relatively thin overall thickness, saves space for a battery and improves the energy density of the battery, has excellent bonding performance, electrolyte resistance and flexibility, can improve the drop resistance of the battery and ensures long-term safe use of the battery.

An object to be solved by the present invention is to provide a multilayer coating film forming method by which a multilayer coating film having reduced nonuniformity and exhibiting excellent luster and high flip-flop properties can be formed. The present invention provides a multilayer coating film forming method characterized by including: applying an aqueous first colored paint (X) containing a color pigment (x1) and an effect pigment (x2) on an object to be coated to form a first colored coating film; applying an aqueous second colored paint (Y) containing a viscosity modifier (y1), a color pigment (y2), and an effect pigment (y3) to form a second colored coating film; applying a clear paint (Z) to form a clear coating film; and curing by heating, wherein a solid content of the aqueous second colored paint (Y) is in a range of 0.1 to 6 mass %, an average value of light transmittance of the second colored coating film is 1% or lower, and a difference |R(X)−R(S)| between an average value of light reflectance of the first colored coating film and an average value of light reflectance of the multilayer coating film is 5% or lower.

This invention relates to a microbial mineralization composite material for inkjet 3D printing and its preparation method. The composite material comprises powder materials and a binder. The powder materials, by weight, include: 70-85 parts magnesium phosphate cement powder, 10-25 parts fine aggregate, 0.5-3 parts a porous protective carrier loaded with urease-producing Bacillus licheniformis spores, 0.05-0.5 parts a nutrient protectant, and 1-5 parts a calcium source. The binder, by weight, includes: 94-98 parts deionized water, urea, 0.02-0.2 parts nutrients, 0.01-0.5 parts a pH adjuster, 0.5-5 parts a viscosity adjuster, and 0.01-0.2 parts a surface tension adjuster. The concentration of urea in the binder is 0.02-0.10 mol / L. This invention solves the problems of existing inkjet 3D printing materials having internal pores, microcracks, and weak interlayer interfaces after molding, limiting the improvement of the mechanical properties of printed parts in the later stages, and the difficulty in adapting the microbial mineralization system to the inkjet 3D printing process.

The invention discloses a hot melt adhesive for folding disposable hygienic products and a preparation method thereof, and relates to the technical field of adhesives, the hot melt adhesive for folding is prepared from the following components by mass: 3-15% of a semi-crystalline polypropylene polymer, 15-40% of an amorphous polymer, 10-25% of a viscosity modifier, 40-60% of tackifying resin, and 0.1-2% of an antioxidant, the sum of the mass percentages of the components is 100%, and the mass ratio of the semi-crystalline polypropylene polymer to the amorphous polymer is 1: (2-5). The hot melt adhesive disclosed by the invention has the characteristic that the bonding force is controllably attenuated along with time, has extremely low surface initial viscosity, and can be applied to folding parts of disposable hygienic products such as baby diapers, training pants, female sanitary napkins, adult incontinence products and the like.

The application belongs to the field of leaching of waste positive electrode material, and particularly relates to a leaching agent for leaching waste ternary cathode material, which is composed of a hydrogen bond complex and a viscosity regulator; the hydrogen bond complex is composed of formula A and formula B; the viscosity regulator is water; the molar ratio of the formula A, the formula B and the viscosity regulator is 1-3:1-3:6-16. In the application, the waste cathode material does not need to be activated too much and can be directly leached due to the use of the leaching agent, in addition, the leaching agent can be recycled.

A method for evaluating a multiphase oil field fluid includes: mixing a first sample of the fluid with a viscosity modifier to convert the sample into a paste; performing a first XRF measurement on the paste to estimate the elemental composition of the fluid; performing calcium measurement on the second sample of the fluid to estimate the total carbonate concentration of the fluid and obtain an acidified second sample; separating the acidified second sample to obtain acidified brine; performing a second XRF measurement on the acidified brine to estimate elemental components of the acidified brine; and determining the elemental components of the solid phase of the multi-phase oil field fluid according to the elemental components of the acidified brine and the elemental components of the multi-phase oil field fluid.

The invention provides a self-corrosion permeable pollutant blocking material for underground water treatment and a preparation method of the self-corrosion permeable pollutant blocking material, and belongs to the technical field of underground water remediation. The self-corrosion permeable pollutant blocking material for underground water treatment is prepared from the following components in percentage by mass: 25 to 35 percent of cement, 12 to 18 percent of 2CaSO4. H2O, 8 to 15 percent of fly ash, 25 to 30 percent of grading pore-forming aggregate, 14 to 18 percent of nano pore-forming aggregate, 1 to 1.5 percent of viscosity modifier, 0.5 to 1 percent of early strength agent and 3 to 4.5 percent of modified biomass fiber, a pore matrix is jointly built through grading pore-forming aggregate, nano pore-forming aggregate and modified biomass fibers, the grading pore-forming aggregate and the nano pore-forming aggregate have self-corrosion shells, the pore-forming aggregate is an inactive substance and does not participate in the reaction of silicate cement from the stage before grouting to the hardening stage, and after the material is completely hardened, the pore-forming aggregate is a self-corrosion shell. And the graded aggregate and the nano pore-forming aggregate are converted into permeable pores containing active substances. The material has the advantages of being good in connectivity, high in supporting performance, wide in pollutant treatment capacity, high in pollutant treatment efficiency, long in continuous treatment time and the like, has anti-blocking capacity and can be pumped.

This invention provides an oil-purifying cleansing mud and its preparation method. The cleansing mud, by weight, comprises 1-5 parts of a viscosity modifier, 0.01-0.1 parts of a chelating agent, 10-20 parts of a moisturizer, 15-25 parts of a surfactant, 0.1-1 parts of a thickener, 0.1-5 parts of a cleanser, 0.1-2 parts of an antioxidant, 0.1-1 parts of a fragrance, and 50-75 parts of water. The surfactant is a combination of sodium cocoyl glycinate, lauryl hydroxysulfonate betaine, cocoyl glutamic acid, decyl glucoside, potassium cocoyl glycinate, and cetearyl alcohol polyether-25. This oil-purifying cleansing mud, through the use of surfactants, cleansers, and moisturizers, gently cleanses pores, absorbs oil and dirt, and simultaneously soothes the skin, preventing dryness and tightness. The synergistic combination of these components achieves a balance between cleansing, oil removal, and gentleness, precisely regulating the skin's balance and thus enhancing the consumer experience.

The invention belongs to the technical field of underground engineering construction and refrigeration, and particularly relates to a cryogenic artificial stratum freezing engineering refrigerant and a preparation method thereof. According to the refrigerant agent, an alcohol-salt water-based solution serves as a main body, a viscosity modifier, a corrosion inhibitor and a scale inhibitor are additionally added, and the alcohol-salt water-based solution is composed of organic acid salt, dihydric alcohol and water. The preparation method comprises the following steps: adding dihydric alcohol into water at normal temperature to form an alcohol-water solution, then adding organic acid salt to obtain an alcohol-salt water-based solution, and finally adding an additive to prepare the refrigerant agent. The refrigerant is wide in raw material source, simple in preparation method, controllable in solution freezing temperature and continuous and stable in cold transmission in a freezing pipe; the refrigerant can meet the freezing requirement of a cryogenic artificial stratum, and is high in adaptability in a complex stratum freezing project.

The invention belongs to the technical field of 3D printing concrete materials, and particularly relates to 3D printing waste glass recycled lightweight aggregate concrete and a preparation method thereof. The concrete is prepared from the following raw materials: cement, silica fume, fine aggregate, waste glass recycled lightweight aggregate, a viscosity modifier, nano silicon dioxide, nano cellulose fibers, a water reducing agent, fly ash, a defoaming agent and water. The lightweight 3D printing concrete with different densities is prepared by replacing sand with the lightweight aggregate prepared by recycling the waste glass, the tackifier, the thixotropic agent, the nano-crystalline cellulose fiber, the water reducer and the fly ash are used for competitive synergistic effect to improve the water-retaining property and the rheological property, a nano-micron multi-scale synergistic system is constructed, multi-stage particle accumulation is effectively realized, and the 3D printing concrete with different densities is prepared. The problems that the constructability is difficult to improve while the density of conventional 3D printing lightweight aggregate concrete is reduced and the lightweight aggregate of low-density 3D printing concrete floats upwards are solved, the printable window time is prolonged, and the interface performance of an aggregate matrix is enhanced.

The invention relates to the technical field of novel functional chemical materials, in particular to a high-temperature-resistant aerosol for isolating adhesion of welding slag and a preparation method of the high-temperature-resistant aerosol. The aerosol is composed of a functional film-forming liquid and a propellant, wherein the functional film-forming liquid comprises the following components in parts by weight: 15-20 parts of polyketone resin, 70-75 parts of ethanol, 3-5 parts of a stripping agent, 0.2-0.3 part of a dispersing agent, 0.1-0.3 part of a flatting agent, 0.01-0.03 part of a corrosion inhibitor and a proper amount of a viscosity modifier; the stripping agent is obtained by mechanically grinding and modifying spherical inorganic powder and stearate. The high-temperature-resistant polyketone resin and the spherical stripping agent are used in the aerosol, so that after the aerosol is sprayed to form a film, instant high-temperature welding slag drop points can be prevented from being adhered to ablate the surface of a metal part, and the quality of a welding part is effectively protected. And meanwhile, the peelability on the surface of a welding piece is considered. After welding is completed, the spraying film layer can be easily stripped and torn off, and cleaning with acid, alkali and detergent is not needed.

This invention belongs to the field of waterproof materials technology, specifically relating to a microcapsule-encapsulated slow-release self-adhesive and a slow-release self-adhesive waterproof membrane. The microcapsule-encapsulated slow-release self-adhesive provided by this invention comprises: 40-45 parts of tackifying resin; 10-15 parts of microcapsule slow-release agent; 15-20 parts of viscosity modifier; 20-30 parts of inorganic filler; 0.5-1.0 parts of primary antioxidant; and 0.2-0.5 parts of auxiliary antioxidant. The microcapsule slow-release agent is a titanate ester coated with nano-silica. This invention uses nano-silica to coat the surface of the titanate ester, allowing the titanate ester in the self-adhesive to be continuously and slowly released as the external environment changes. This continuously fills the gaps formed between the self-adhesive and the concrete structure under water pressure, automatically repairing leaks or sealing the capillary pores of the concrete structure. Therefore, it can adapt to the constantly changing underground waterproofing environment, achieving a long-term stable dynamic waterproofing effect.

Disclosed is a test system (100) comprising a test apparatus (100, 400). The test apparatus includes a pool (102) having a volume and an inlet (106, 408) for filling the volume with a test fluid (108, 414). An inner surface (114) of the pool comprises an amount of a viscosity modifying reagent (110, 410) in a dried format. The system also includes an immunochromatography assay strip (104, 502). The viscosity modifying reagent comprises a viscosity-removing salt. The salt is configured to precipitate a viscosity-causing substance present in the test fluid. The immunochromatography assay strip is to be entered through the inlet to be in contact with the test fluid, when in use. The system facilitates processing of viscous fluids such as saliva for rapid diagnostic testing using lateral flow-based assays.