33results about How to "Non-toxic material" patented technology

Disclosed is a water treatment apparatus including a pipe. Elements disposed in the pipe are respectively made of lead-free brass and nontoxic ultra high molecular weight polyethylene instead of brass and plastic polyethylene that are conventionally used materials. Therefore, when the elements come into contact with water, neither heavy metals, such as lead (Pb), nor organic and inorganic substances harmful to the human body are produced.

A power supply includes a power converter configured to convert an input voltage to a target output DC voltage in response to a feedback signal, the feedback signal having a value. The power supply also includes a regulator coupled to the power converter and configured to generate an output power status signal, which maybe in one of two states depending whether an output current from the regulator is above or below a target current over a preset time duration. Further, a control circuit is coupled to the power converter and to the regulator and configured to increment or decrement the value of the feedback signal depending on the state of the power status signal.

The invention relates to a production method of triethylamine method cold core box resin suitable for high humidity environment, and specially relates to a production method of triethylamine method cold core box resin for casting; the method is as follows: first, synthesizing separately a component I and a component II, and then mixing the components I and the component II; the components I comprises the following raw materials by weight: 42%-65% of benzylic ether phenolic resin, 16.2%-25% of an aromatic solvent, 6%-12% of a citrate plasticizer, 12%-24% of a fatty acid dibasic acid ester plasticizer and 0.4%-0.8% of a silane coupling agent; the components II comprises the following raw materials by weight: 72.5% of polyaryl polymethylene isocyanate (PAPI), 27% of synthetic plant ester and 0.5% of a phosphate ester inhibitor. The method is unique, good in moisture resistant performance and high in environmental protection performance, can improve casting production conditions, achieves ''green casting'', and improves the surface quality and dimension accuracy of castings.

The invention discloses a gum-protecting device which is an integrated shell structure. The inner surface of the shell is matched with the half of the longitudinal section of a tooth drill body. The shell of the gum-protecting device is devised into a machine needle base connector, a body connector, a gum-protecting part and a positioning part. The gum-protecting part of the gum-protecting deviceis matched with the machine needle on the tooth drill; the inner diameter of the gum-protecting part is larger than the diameter of the machine needle; and a gap is remained at the fixed socket part of the machine needle of the tooth drill. The front end of the gum-protecting part is provided with a positioning part which is extruded out of the length of the front end of the machine needle; the machine needle base connector of the um-protecting device is covered at the external surface of the machine needle base of the tooth drill; the body connector of the um-protecting device is covered at the external surface of a handle of the tooth drill; the machine needle base connector and the body connector are tightly matched with the tooth drill body, so that the gum-protecting device can be stably fixed at the external surface of the tooth drill. The gum-protecting device has the positioning function in the process of polishing tooth shoulder, and effectively separates the machine needle from the gum to protect the gum.

The invention discloses a material for producing handicrafts. The material comprises the following components by weight parts: 10-15 parts of paraffin, 20-35 parts of calcium carbonate, 20-50 parts of polyethylene, 0-15 parts of pigment powder, and 0-2 parts of rosin, wherein the polyethylene is high-density polyethylene, low-density polyethylene or linear low-density polyethylene. A preparation method of the material for producing the handicrafts comprises heating 10-15 parts of the paraffin to 50-65 DEG C for dissolving, adding 20-50 parts of the polyethylene to mix, heating to 110-220 DEG C for dissolving, adding 20-35 parts of the calcium carbonate to mix, adding 0-15 parts of the pigment powder and 0-2 parts of the rosin under a temperature of 200-220 DEG C, dissolving and uniformly stirring to obtain the finish product. The method uses the paraffin, the calcium carbonate and the polyethylene as main raw materials; and the finish product has advantages of high hardness, good toughness, high resistance intensity, light weight and low cost, and the preparation technology is simple and low in thermoplastic temperature.

The invention discloses a breathable, comfortable and cool-feeling mask and a preparation method thereof. The mask is divided into three-layer structures, namely, an outer layer of PE / PP skin-core structure bicomponent spunbond nonwoven fabric, and a middle layer of polypropylene melt-blown nonwoven fabric. The inner layer is a cool-feeling PE / PP skin-core structure bi-component spunbond non-woven fabric, by adding cool-feeling functional materials during the processing of the inner layer PE / PP skin-core structure bi-component spunbond non-woven fabric, It makes the mask feel comfortable and cool when it is in contact with the skin, and the use of PP and PE in the three-layer structure of the mask gives the mask a very high infrared transmittance, which can make the thermal radiation of the human face radiate in time. The mask of the invention has the characteristics of breathability, comfort, cool feeling and the like, and the preparation method is simple in process, has good cooling effect, is convenient for promotion and use, and improves the uncomfortable experience of wearing the mask in summer, such as stuffy heat and sweating.

The invention discloses a built-in breather valve and an air filtering mask of a fan. The built-in breather valve and the air filtering mask of the fan are characterized in that a built-in filter screen is made of high-class static fiber filter material matched with activated carbon and effectively prevents dust, various gases and oily particles from being involved therein, especially the air inlet volume of the built-in fan is increased, the problem of wind resistance of a filtering device is effectively solved, the air flowing speed in the mask is improved, and breathing pressure of a human body is reduced. An inspiration one-way valve piece can prevent powerful wind from being straightly blown towards the face of the human body and enables inflowing wind to be soft. The inspiration one-way valve piece can exhaust waste gas, and outside pollutants is prevented from entering the valve while stuffiness feeling in the mask is relieved.

The invention provides a device and a method for controlling follicle development of equine animals and preventing and treating reproductive tract inflammation. The device is composed of a nylon bracket and a slow-release device. The slow-release device is fixedly installed on the nylon bracket. The nylon bracket includes: a connecting part and two long arms, and the two long arms are connected to the connecting part respectively, and the two long arms are connected to the connecting part respectively. A certain angle is formed between two long arms, and the long arm is composed of a cylinder and a top sphere, the top of the cylinder is provided with a top sphere, and the bottom of the cylinder is connected with the connecting part, and the slow release device includes two circles Each cylinder is provided with a number of small holes and disc structures arranged in an orderly manner. The small holes are set between the two disc structures. The top of the cylinder is a hollow round cap. The cylinder is covered with a long On the arm, the hollow round cap matches the top sphere, so that the cylinder is fixed on the long arm, and the disc structure is perpendicular to the extension direction of the long arm.

A controller for controlling a plurality of serially-connected LED strings includes a reference voltage generator configured to generate a plurality of reference voltages. The reference voltage generator is further configured to vary the plurality of reference voltages based on a sampled voltage signal. The sampled voltage signal can include one or both of a peak voltage of the rectified input AC voltage and a peak voltage of an LED diode forward voltage Vf. The controller further includes a plurality of linear regulators, each linear regulator coupled between a cathode of a corresponding LED string and a common current sense node, and each linear regulator is configured to regulate a current through a corresponding LED string according to a corresponding reference voltage.

The invention discloses an azo dye adsorbent and application thereof. The azo dye adsorbent is a novel nanoscale coordination polymer material which is synthesized by FeCl3 and 1, 3, 5-trimesic acid using a solvothermal method. The novel nanoscale coordination polymer material is used for treatment of azo dye waste water. The azo dye adsorbent has the beneficial effect of adopting a simple preparation method, being high in material purity, rapid and fast in adsorption, wide in application scope, free from residue and toxic and side effects, and is expected to be widely used in the field of environment engineering.