阅读说明：本技术 一种用于医用橡胶手套制备过程中的脱模组合物 (Demoulding composition used in preparation process of medical rubber gloves ) 是由 潘玉东 于 2020-03-11 设计创作，主要内容包括：本发明涉及脱模剂相关的技术领域,更具体地,本发明提供一种用于医用橡胶手套制备过程中的脱模组合物。本发明的第一方面提供一种脱模组合物,脱模组合物的粒径小于50um；其制备原料包括PTFE、PE以及OPE其制备原料包括PTFE、PE以及OPE。本发明提高了脱模组合物在使用过程中的耐高温以及化学稳定性,同时避免脱模过程中脱模剂在模具与脱模部件表面的粘结而导致的二次污染,降低腐蚀,延长机器清模周期,延长设备使用寿命；此外,还可以缩短脱模时间,提高生产效率,降低生产成本。(The invention relates to the technical field related to release agents, and particularly provides a release composition used in a preparation process of medical rubber gloves. A first aspect of the invention provides a mold release composition having a particle size of less than 50 um; the raw materials for preparing the composite material comprise PTFE, PE and OPE. The invention improves the high temperature resistance and chemical stability of the demoulding composition in the using process, simultaneously avoids secondary pollution caused by the adhesion of the demoulding agent on the surfaces of a mould and a demoulding part in the demoulding process, reduces corrosion, prolongs the mould cleaning period of a machine and prolongs the service life of equipment; in addition, the demolding time can be shortened, the production efficiency can be improved, and the production cost can be reduced.)

1. A mold release composition characterized in that the particle size of the mold release composition is less than 50 um; the raw materials for preparing the composite material comprise PTFE, PE and OPE.

2. The stripping composition as claimed in claim 1, wherein the dropping point of PTFE is 310 to 330 ℃.

3. The stripping composition according to claim 1 or 2, wherein the PE has a penetration of 2 to 5dmm at 25 ℃.

4. The release composition of claim 1 or 2, wherein the PE has a softening point of 100 to 120 ℃.

5. The release composition of claim 4, wherein the PE has a viscosity of 20 cps to 1000cps at 140 ℃.

6. The stripping composition according to any of claims 1 to 5, wherein the OPE has a relative molecular weight of 2500 to 4000.

7. The release composition of claim 6, wherein the OPE has a melting point of 100 to 110 ℃.

8. The stripping composition as claimed in claims 1 to 7, wherein the weight ratio of PTFE, PE and OPE is 1: (2 to 3.5) and (0.55 to 0.85).

9. The demolding composition according to any one of claims 1 to 8 is applied to demolding treatment in the preparation process of medical rubber gloves.

10. A mold release agent comprising the mold release composition of any of claims 1 to 8, wherein the content of the mold release composition is less than 0.5% by weight based on the total weight of the mold release agent.

Technical Field

The invention relates to the technical field related to release agents, and particularly provides a release composition used in a preparation process of medical rubber gloves.

Background

Articles made from natural or synthetic rubber are elastomeric materials with low glass transition temperatures. The surfaces of these materials are tacky and tend to stick to each other. For example, latex gloves are difficult to release from the glove mold at the end of the manufacturing process, and they tend to stick together or clump when the package is distributed and sold.

The release agent is a functional substance between the mold and the organic polymer substance or other products. The processing aid is a processing aid which prevents objects such as molded products, laminated products, spinning products and the like of rubber, plastic, polyurethane and the like and other materials from being adhered to the surface of a mold or metal and has the function of easy detachment.

At present, a method for removing a rubber product from a mold is a method of adopting a particle material or a powder material, and a method of combining a particle material with a solution is also adopted, but the prior use process has some problems, for example, a powdered mold release agent is easy to float in the air, pollutes the surrounding air, or absorbs water and becomes damp in the placement process, so that the subsequent use effect is influenced, or the amount of the powdered mold release agent is too large in the actual use process, the powdered mold release agent is not high-temperature resistant, secondary pollution is easily caused by adhesion between a mold release product and the surface of the mold, when the powdered mold release agent is combined with the solution, the required content is more, so that the cost is higher, or the dispersibility of the powdered mold release agent in the solution is poorer, so that the mold release effect.

Disclosure of Invention

The invention aims to improve the high temperature resistance and chemical stability of the demoulding composition in the using process, simultaneously avoid secondary pollution caused by the adhesion of the demoulding agent on the surfaces of a mould and a demoulding part in the demoulding process, reduce corrosion, prolong the mould cleaning period of a machine and prolong the service life of equipment; in addition, the demolding time can be shortened, the production efficiency can be improved, and the production cost can be reduced.

In order to solve the above technical problems, a first aspect of the present invention provides a mold release composition, the particle size of the mold release composition is less than 50 um; the preparation raw materials comprise PTFE, PE and OPE, and the preparation raw materials comprise PTFE, PE and OPE; preferably, the weight ratio of PTFE, PE and OPE is 1: (2-3.5) 0.55-0.85); further preferably, the weight ratio of PTFE, PE and OPE is 1: (2.3-2.8): (0.62-0.75); more preferably, the weight ratio of PTFE, PE and OPE is 1: 2.6: 0.68.

as a preferred embodiment of the present invention, the particle size of the mold release composition is less than 10 um.

As a preferred technical scheme of the invention, the dropping melting point of PTFE is 310-330 ℃; preferably, the dropping melting point of PTFE is 315 to 325 ℃.

The melting point of the droplet is the temperature at which the first droplet of fluid is dropped from the grease cup of the apparatus under a predetermined heating condition.

In a preferred embodiment of the present invention, PTFE is a powdery material.

As a preferred technical scheme of the invention, the medium particle size (DV50) of PTFE is 10-50 um; the source of PTFE is not particularly limited in the invention, and preferably, PTFE is purchased from Nanjing Tianshi New Material science and technology Co., Ltd, and is selected from any one or more of PTFE-0154, PTFE-0155, PTFE-0148, PTFE-0142, PTFE-0143 and PTFE-0127; further preferred are PTFE-0148 and PTFE-0127; further preferably, the weight ratio of PTFE-0148 to PTFE-0127 is 1: (0.5 to 0.7); more preferably 1: 0.57; wherein the melt point of PTFE-0148 is 320 ℃, and the medium particle size comprises 11-15 um and 30 um; the drop melting point of PTFE-0127 is 320 ℃, and the median particle size is 25 um.

As a preferred technical scheme of the invention, the penetration of PE at 25 ℃ is 2-5 dmm; the penetration is the depth of a standard cone (generally 150 g in total, and also 100 g in the specification) which sinks into a grease sample kept at 25 ℃ within 5 seconds. The unit is 1/10 mm. A larger penetration indicates a softer, i.e. less consistency; the harder, i.e. the greater the consistency, the other way round.

As a preferred technical scheme of the invention, the softening point of PE is 100-120 ℃; wherein softening point (softening point), the temperature at which the material softens; mainly refers to the temperature at which an amorphous polymer begins to soften, which is related not only to the structure of the polymer but also to the size of its molecular weight, which together with other physicochemical parameters such as the molecular weight of the polymer, affects the physicochemical properties of the polymer.

As a preferred technical scheme of the invention, the viscosity of PE is 20-1000 cps at 140 ℃.

The source of PE is not particularly limited in the present invention, and preferably PE is purchased from seinuo, and is selected from any one or a combination of more of SN110D, SN9079, and 9038A, SN 118; further preferably, the PE comprises SN9079 and SN118, and further preferably, the weight ratio of SN9079 to SN118 is 1: (0.3 to 0.5); more preferably, the weight ratio of SN9079 to SN118 is 1: 0.42; wherein the softening point of SN9079 is 105-110 ℃, and the penetration at 25 ℃ is 4-5 dmm; SN1189 has a softening point of 110-115 ℃ and a penetration of 2-4 dmm at 25 ℃.

As a preferred technical scheme of the invention, the relative molecular weight of OPE is 2500-4000; preferably, the melting point of the OPE is 100-110 ℃; the source of the OPE is not particularly limited, and in one embodiment, the OPE is purchased from Mingyun rubber and Plastic company Limited, Yongyin, and the relative molecular weight of the OPE is 3000-3500; preferably, the melting point of OPE is 102-104 ℃.

When the PTFE with the powdery specific particle size, the PE with the specific viscosity and the OPE are mutually matched in the experimental process, the secondary pollution caused by the adhesion of the release agent on the surfaces of a mold and a demolding part in the demolding process can be effectively avoided, and the high-temperature-resistant performance is good, so that the uniform mixing and the spreading on the surface of the mold can be favorably realized, the system cohesion is improved, the influence of external conditions on the acting force is reduced, the non-uniform acting force of the release agent is reduced, the release agent is easy to adhere to the mold or the demolding substance, and the secondary pollution is caused.

The invention provides application of the demoulding composition in demoulding treatment in the preparation process of medical rubber gloves.

The third aspect of the invention provides a mold release agent containing the mold release composition, wherein the content of the mold release composition is less than 0.5% of the total weight of the mold release agent.

A fourth aspect of the present invention provides a method for preparing the mold release composition, comprising: mixing PTFE, PE and OPE, and sieving with a sieve of less than 10um to obtain the final product.

The above-described words "preferred", "more preferred", and the like, refer to embodiments of the invention that may provide certain benefits, under certain circumstances. However, other embodiments may be preferred, under the same or other circumstances.

Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention. When a range of values is disclosed herein, the range is considered to be continuous and includes both the minimum and maximum values of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included.

Detailed Description

In order to better understand the above technical solutions, the following detailed descriptions will be provided with reference to specific embodiments. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention.