37results about How to "The physical and mechanical properties remain stable" patented technology

The invention provides an MDF (medium density fiber)-E1-level urea-formaldehyde resin adhesive. Formaldehyde and urea are used as main materials; and urea is added by three batches, and the molar ratio of formaldehyde to urea is controlled to be respectively (2.4-3.0) to 1, (1.3-1.5) to 1, and (0.8-1.0) to 1 after each batch of urea is added. The glue preparation process adopts a weak base-medium strong acid-weak base reaction path, and the materials are reacted in three mediums of which the pH is 8.0-8.5, 2.5-3.5 and 8.0-8.5, respectively to finally prepare the MDF-E1-level urea-formaldehyde resin adhesive. By using the MDF-E1-level urea-formaldehyde resin adhesive to prepare an El-level medium-density fiber board, the effect of reducing the formaldehyde emission can be achieved without adding a formaldehyde catching agent or carrying out post ammonia water treatment.

The invention discloses a two-component polyurethane asphalt waterproof coating and a preparation method thereof. The waterproof coating comprises a component A and a component B. The component A comprises modified polyurethane prepolymer obtained by a reaction of polyurethane prepolymer with first hydroxyl-terminated polybutadiene, and the polyurethane prepolymer is prepared by a reaction of polyol and polyisocyanate; the component B is prepared from petroleum asphalt, second hydroxyl-terminated polybutadiene, and a secondary amine curing agent and / or a primary amine curing agent; the first and second hydroxyl-terminated polybutadiene are respectively and independently selected from one or more combinations of compounds in a formula (I) (please see the specification for the formula), of structural monomers in the formula (I), monomers represented by a account for 10-30%, monomers represented by b account for 50-70%, and monomers represented by c account for 10-30%; the preparation method comprises the following step that the components A and B are respectively prepared and then mixed to obtain the waterproof coating; and according to the waterproof coating, the non-curing effect at the normal temperature can be achieved, the coating has good stability, good dispersion uniformity can always be maintained, and the stability of physical and mechanical properties and other properties of the coating can be ensured.

The invention discloses a geomechanical model test similar material for simulating a cover layer, which is formed by mixing the following components in parts by mass: 100 parts of barite powder, 4-6 parts of semi-refined paraffin wax, 5-10 parts of 32# hydraulic machine oil, 5-20 parts of bentonite and 8-12 parts of quartz sand. After the material is prepared into a sample of which the volume weight is 16-22 KN / m<3> and the size is 10cm*10cm*10cm, the deformation modulus is 0.11-1.19 MPa, and the compression strength is 1.8-18.4 KPa. The invention also discloses a preparation method of the material. The compression strength and deformation modulus of the cover layer simulating material are lower, and the volume weight, compression strength and deformation modulus of the obtained material can change within a wide range by adjusting the amounts of the substances; and thus, the material can be used as an ideal geomechanical model similar material for simulating a cover layer. The geomechanical model test similar material fills up the blank in the prior art; the raw materials have wide sources and have no toxic or side effect; and the method has the advantages of simple preparation process, low energy consumption, high preparation efficiency and low cost.

The invention relates to a rock mass simulating material and a preparation method thereof. The rock mass simulating material is prepared from barite powder, cement, water, 32# hydraulic machine oil and polymer with a special formula I. The similar material has sensibility, can directly obtain deformation information of a model test, does not need an additional test apparatus, is greatly convenientfor test work in the test, can be used for simulating the rock mass similar material, is easy to process, does not need to maintain, can realize repeated utilization, and greatly reduce test cost.

The invention discloses a preparation method of a degradable straw fiber foam material and belongs to the technical field of preparation of composite materials. The method comprises the steps as follows: alkalization and modification of straw, preparation of a polyvinyl chloride mixture and formation of the degradable straw fiber foam material. The prepared degradable straw fiber foam material has good physical and mechanical performance, high chemical stability and high strength and is environment-friendly and degradable, the straw serving as the main material comes from reutilized waste, polyvinyl chloride serving as the other main material can be obtained through recycling, the resource can be saved, and the production cost is lower than that of a traditional plastic foam material.

The invention discloses a geomechanical model simulating material for simulating a rock mass, which is formed by mixing the following components in parts by mass: 100 parts of barite powder, 0.5 to 7 parts of cement, 0.5 to 1.5 parts of water, 2 to 6 parts of semi-refined paraffin wax, and 2 to 6 parts of No.32 hydraulic engine oil; through testing, a test sample with the volume weight of 28KN / m<3> and size of 10cm*10cm*10cm, which is made of the material, has the deformation modulus of between 29.5 and 109.1MPa and the tensile strength of between 0.33 and 1.21MPa; and through a test sample with the volume weight of 24KN / m<3> and size of 10cm*10cm*5cm, which is made of the material, has the deformation modulus of between 26.4 and 94.7MPa and the tensile strength of between 0.30 and 1.02MPa. The invention also discloses a preparation method of the material. The rock mass simulating material provided by the invention contains the cement, the water, the paraffin wax and the hydraulic engine oil, so that the tensile strength and the deformation modulus of the rock mass simulating material can change in a larger range by regulating the respective mixing amount of the cement, the water, the paraffin wax and the hydraulic engine oil, and the requirement for simulating rock masses with different performances can be fulfilled; and the invention has the advantages of simple preparation process, low energy consumption, high efficiency and low cost.

The invention discloses a geomechanics model simulating material for simulating a weak rock mass. The geomechanics model simulating material is composed of the following components in parts by mass: 100 parts of barite powder, 0.5-7 parts of semi-refined paraffin wax and 3-7 parts of No.32 hydraulic engine oil; the geomechanics model simulating material is prepared into a sample test with the volume weight of 26 kN / m<3> and the size of 10cm*10cm*10cm, the transformation modulus tested by the test sample is 13.2-28.3 MPa and the compressive strength tested by the test sample is 0.08-0.19 MPa; the geomechanics model simulating material is prepared into a test sample with the volume weight of 23 kN / m<3> and the size of 10cm*10cm*5cm, the transformation modulus tested by the test sample is 11.2-24.7 MPa and the compressive strength tested by the test sample is 0.07-0.17 MPa. The invention also discloses a preparation method of the geomechanics model simulating material. The compressive strength and the transformation modulus of the rock mass simulating material are lower so that the geomechanics model simulating material can be used as the more ideal geomechanics model simulating material for simulating the weak rock mass; and the geomechanics model simulating material provided by the invention has the advantages of wide source of the raw materials, no toxic side effects, simple preparation process, low energy consumption, high preparation efficiency and low cost.

The invention discloses a two-component polyurethane asphalt waterproof coating and a preparation method thereof. Modified polyurethane prepolymer, polyurethane prepolymer is made by reacting polyol and polyisocyanate; B component contains petroleum asphalt, second hydroxyl terminal polybutadiene, secondary amine curing agent and / or primary amine curing agent; 1. The second hydroxyl-terminated polybutadiene is independently selected from one or more combinations of the compounds described in formula (I), and among the structural monomers in the formula, the monomer represented by a accounts for 10-30% , b accounts for 50-70%, and c accounts for 10-30%; preparation method: prepare components A and B separately and mix them; the present invention can not only realize the effect of non-curing at room temperature, but also has good coating stability and can always maintain Good dispersion uniformity ensures stable physical and mechanical properties of the coating.

The invention relates to a method to produce equivalent material of iron crystal sand cemented rock soil that uses iron ore, barite powder and quartz sand as main aggregate, uses solution that is made up from rosin and alcohol as cementing agent, and uses gesso as regulator. Whisking the iron ore, barite powder and quartz sand, gesso, resin-alcohol solution to equal, pouring into steel mould, pressing the mixture, opening the mould, drying for 2-3 days, the invention could be gained. The invention has the advantages of high unit weight, large range of mechanics parameter, easy to process and low cost.

The invention discloses a soft rock roadway anchored concrete filled steel tube anti-floor heave device and a construction method thereof. The construction method comprises the following steps: punching pile holes at the two sides of the floor of a roadway, embedding a steel tube body in the pile holes, pouring cement mortar, fixing the steel tube body in the pile holes, pouring concrete in the steel tube body to form a steel pipe pile, enabling an anchor rod or an anchor cable to penetrate the through holes of the steel tube pile and be anchored in rock formation at the two base angles of the roadway, sheathing cushion blocks, and fastening by nuts to form an anchoring structure. The invention can effectively control the roadway floor heave, improve stress distribution, and have the advantages of simple and convenient construction process, low cost, short time limit, superior cost performance, and stable physical mechanical properties.

A device for making soil samples / rock samples with different moisture content. The main box is a closed space. A bracket is installed in the middle of the main box. A weight detection device is installed on the bracket. The weight detection device is equipped with a weighing tray. The space inside the main box is divided into the space for placing soil samples / rock samples on the upper side and the humidification space on the lower side. There is a water tank in the humidification space of the main box, and a heating device is installed in the water tank. The main box is placed in the soil / rock sample The position of the space is provided with a box door for putting in and taking out the soil sample / rock sample, and an air pressure detection device, a temperature detection device and a humidity detection device are arranged on the top of the soil sample / rock sample storage space in the main box. The invention makes the water content state of the obtained soil sample / rock sample more uniform, the physical and mechanical properties of the soil sample / rock sample are stable and easy to control, the operation process is simple and convenient, and the preparation efficiency is high.

The invention discloses a method for manually preparing flocculent clay in a coastal region. The surface charge of kaolin particles is changed by chemical reagents, and the flocculent clay is preparedby the aid of a step-by-step loading prepressing technology. The method includes the steps: preparing dispersing agent solution, adding kaolin powder and mixing the dispersing agent solution and thekaolin powder to form slurry; adding flocculants and mixing the materials; applying load step by step to form a sample; performing step-by-step unloading according to the reverse order of load application; cutting and finishing the sample to finally obtain a flocculent clay sample. Compared with an existing method, the method has the advantages that a more loose and reliable flocculent structure can be acquired, and the flocculent clay with high water content in the coastal region can be more effectively simulated.

The invention discloses a nano-copper oxide in-situ reduction wood composite material and a preparation method thereof. A nano-copper oxide in-situ reduction wood composite material is made of five components, and the components are: Pennisetum micropowder 40%-50%, wheat straw coarse powder 20%-30%, reed fiber 10%~20%, nano-copper oxide powder 10%~15%, polyethylene glycol-400 0.5%~3%. The preparation method comprises eight steps of preparation of Pennisetum micropowder, preparation of wheat straw coarse powder, preparation of reed fiber, batching, preparation of wood alloy powder, material mixing, hot molding and cryogenic treatment. The preparation method comprehensively applies powder metallurgy and powder engineering, composite materials and engineering, wood science and technology and other interdisciplinary material forming theories, and innovates the forming technology and method of wood composite materials.