阅读说明：本技术 一种无毒密封胶及其制备方法 (Nontoxic sealant and preparation method thereof ) 是由 岑学勇 曹雪花 于 2021-09-14 设计创作，主要内容包括：本发明公开了一种无毒密封胶,由以下组分的原材料制备而成：生物基异氰酸酯、丁腈橡胶、聚醚多元醇、活性纳米碳酸钙、生物聚醚多元醇、硅烷偶联剂、可降解增塑剂、生物降解填料、固化剂、催化剂和消泡剂。本发明的制备方法包括：生物降解填料可降解增塑剂制备、主料混合制备、降温和出料包装。本发明生物基异氰酸酯本身的制备和应用过程不污染环境的特性得以发挥,有效解决了现有技术中的密封胶的制备和使用不够环保的技术问题,进而实现了降低密封胶对环境破坏的技术效果。(The invention discloses a nontoxic sealant which is prepared from the following raw materials: the adhesive comprises bio-based isocyanate, nitrile rubber, polyether polyol, active nano calcium carbonate, bio-polyether polyol, a silane coupling agent, a degradable plasticizer, a biodegradable filler, a curing agent, a catalyst and a defoaming agent. The preparation method comprises the following steps: preparing biodegradable filler and degradable plasticizer, mixing and preparing main materials, cooling, discharging and packaging. The characteristic that the preparation and application processes of the bio-based isocyanate do not pollute the environment is exerted, the technical problem that the preparation and use of the sealant in the prior art are not environment-friendly is effectively solved, and the technical effect of reducing the damage of the sealant to the environment is further realized.)

1. A non-toxic sealant is characterized in that: the material is prepared from the following raw materials:

the adhesive comprises bio-based isocyanate, nitrile rubber, polyether polyol, active nano calcium carbonate, bio-polyether polyol, a silane coupling agent, a degradable plasticizer, a biodegradable filler, a curing agent, a catalyst and a defoaming agent.

2. The non-toxic sealant according to claim 1, characterized in that: the material is prepared from the following raw materials in parts by weight:

40-50 parts of bio-based isocyanate, 90-100 parts of nitrile rubber, 10-18 parts of polyether polyol, 30-40 parts of active nano calcium carbonate, 10-20 parts of biological polyether polyol, 2-6 parts of silane coupling agent, 20-30 parts of degradable plasticizer, 35-45 parts of biodegradable filler, 10-15 parts of curing agent, 1-3 parts of catalyst and 1-3 parts of defoaming agent.

3. The non-toxic sealant according to claim 2, characterized in that: the material is prepared from the following raw materials in parts by weight:

40-45 parts of bio-based isocyanate, 90-95 parts of nitrile rubber, 10-14 parts of polyether polyol, 30-35 parts of active nano calcium carbonate, 10-15 parts of biological polyether polyol, 2-4 parts of silane coupling agent, 20-25 parts of degradable plasticizer, 35-40 parts of biodegradable filler, 10-13 parts of curing agent, 1-2 parts of catalyst and 1-2 parts of defoaming agent.

4. The non-toxic sealant according to claim 2, characterized in that: the material is prepared from the following raw materials in parts by weight:

45-50 parts of bio-based isocyanate, 95-100 parts of nitrile rubber, 14-18 parts of polyether polyol, 35-40 parts of active nano calcium carbonate, 15-20 parts of biological polyether polyol, 4-6 parts of silane coupling agent, 25-30 parts of degradable plasticizer, 40-45 parts of biodegradable filler, 13-15 parts of curing agent, 2-3 parts of catalyst and 2-3 parts of defoaming agent.

5. The non-toxic sealant according to claim 2, characterized in that: the material is prepared from the following raw materials in parts by weight:

45 parts of bio-based isocyanate, 95 parts of nitrile rubber, 14 parts of polyether polyol, 35 parts of active nano calcium carbonate, 15 parts of bio-polyether polyol, 4 parts of silane coupling agent, 25 parts of degradable plasticizer, 40 parts of biodegradable filler, 13 parts of curing agent, 2 parts of catalyst and 2 parts of defoaming agent.

6. The non-toxic sealant according to claim 2, characterized in that: the material is prepared from the following raw materials in parts by weight:

50 parts of bio-based isocyanate, 90 parts of nitrile rubber, 14 parts of polyether polyol, 35 parts of active nano calcium carbonate, 15 parts of bio-polyether polyol, 4 parts of silane coupling agent, 25 parts of degradable plasticizer, 40 parts of biodegradable filler, 13 parts of curing agent, 2 parts of catalyst and 2 parts of defoaming agent.

7. The method of preparing a nontoxic sealant according to any of claims 1-6 wherein: the method comprises the following steps:

(S1) preparing the biodegradable filler degradable plasticizer: firstly, drying the biodegradable filler and the degradable plasticizer at 120 ℃ until the moisture content is detected to be less than or equal to 0.1% for later use;

(S2) mixing and preparing main materials: adding bio-based isocyanate, nitrile rubber, polyether polyol and a degradable plasticizer into a reaction kettle, heating, starting stirring, starting adding a biodegradable filler when the temperature is raised to 85 ℃, continuously heating, heating to 120-130 ℃ while stirring, starting vacuum pumping, keeping the temperature at 120-130 ℃, starting vacuum dehydration at the vacuum degree of less than or equal to 0.09Mpa, and stopping vacuum pumping when the moisture of the material is detected to be less than or equal to 0.05%;

(S3) cooling: starting stirring and cooling, adding the other raw materials except the bio-polyether polyol and the silane coupling agent when the temperature is reduced to 45-50 ℃, then continuously stirring and heating to 90-95 ℃, vacuumizing and introducing nitrogen for protection and constant-temperature reaction for 2.5-4h, starting cooling after the reaction is finished, adding the bio-polyether polyol and the silane coupling agent when the temperature is reduced to below 40 ℃, and stirring at a high speed for 0.5h to uniformly mix the materials;

(S4) discharging and packaging: discharging and packaging the uniformly mixed materials.

Technical Field

The invention relates to the technical field of sealant products, in particular to a non-toxic sealant, and especially relates to a non-toxic sealant and a preparation method thereof.

Background

The sealing glue is a sealing material which deforms along with the shape of the sealing surface, is not easy to flow, has certain cohesiveness, is an adhesive used for filling a configured gap to play a role in sealing, and has the functions of leakage prevention, water prevention, vibration prevention, sound insulation, heat insulation and the like.

It is made up by using dry or non-dry viscous material of asphalt, natural resin or synthetic resin, natural rubber or synthetic rubber, etc. as base material, and adding inert biodegradable fillers of talcum powder, clay, carbon black, titanium white powder and asbestos, etc. and adding degradable plasticizer, solvent, solidifying agent and accelerator. Can be divided into three categories of elastic sealant, liquid sealing gasket and sealing putty. It is widely used for sealing building, transportation, electronic instrument and meter and parts.

However, in the process of implementing the technical solution in the prior art, the applicant finds that the following technical problems exist in the technical solution in the prior art:

the raw materials for preparing the sealant cause pollution to the environment in the production and application processes, and are not beneficial to environmental protection.

Disclosure of Invention

The invention aims to solve the technical problem of providing a non-toxic sealant, solves the technical problem that raw materials for preparing the sealant in the prior art are not friendly to the environment, and at least achieves one of the technical effects of reducing the damage to the environment.

In order to solve the technical problems, the technical scheme of the invention is as follows:

the non-toxic sealant is prepared from the following raw materials:

the adhesive comprises bio-based isocyanate, nitrile rubber, polyether polyol, active nano calcium carbonate, bio-polyether polyol, a silane coupling agent, a degradable plasticizer, a biodegradable filler, a curing agent, a catalyst and a defoaming agent.

Preferably, the material is prepared from the following raw materials in parts by weight:

40-50 parts of bio-based isocyanate, 90-100 parts of nitrile rubber, 10-18 parts of polyether polyol, 30-40 parts of active nano calcium carbonate, 10-20 parts of biological polyether polyol, 2-6 parts of silane coupling agent, 20-30 parts of degradable plasticizer, 35-45 parts of biodegradable filler, 10-15 parts of curing agent, 1-3 parts of catalyst and 1-3 parts of defoaming agent.

Preferably, the material is prepared from the following raw materials in parts by weight:

40-45 parts of bio-based isocyanate, 90-95 parts of nitrile rubber, 10-14 parts of polyether polyol, 30-35 parts of active nano calcium carbonate, 10-15 parts of biological polyether polyol, 2-4 parts of silane coupling agent, 20-25 parts of degradable plasticizer, 35-40 parts of biodegradable filler, 10-13 parts of curing agent, 1-2 parts of catalyst and 1-2 parts of defoaming agent.

Preferably, the material is prepared from the following raw materials in parts by weight:

45-50 parts of bio-based isocyanate, 95-100 parts of nitrile rubber, 14-18 parts of polyether polyol, 35-40 parts of active nano calcium carbonate, 15-20 parts of biological polyether polyol, 4-6 parts of silane coupling agent, 25-30 parts of degradable plasticizer, 40-45 parts of biodegradable filler, 13-15 parts of curing agent, 2-3 parts of catalyst and 2-3 parts of defoaming agent.

Preferably, the material is prepared from the following raw materials in parts by weight:

45 parts of bio-based isocyanate, 95 parts of nitrile rubber, 14 parts of polyether polyol, 35 parts of active nano calcium carbonate, 15 parts of biological polyether polyol, 4 parts of silane coupling agent, 25 parts of degradable plasticizer, 40 parts of biodegradable filler, 13 parts of curing agent, 2 parts of catalyst and 2 parts of defoaming agent.

Particularly preferably, the material is prepared from the following raw materials in parts by weight:

50 parts of bio-based isocyanate, 90 parts of nitrile rubber, 14 parts of polyether polyol, 35 parts of active nano calcium carbonate, 15 parts of bio-polyether polyol, 4 parts of silane coupling agent, 25 parts of degradable plasticizer, 40 parts of biodegradable filler, 13 parts of curing agent, 2 parts of catalyst and 2 parts of defoaming agent.

The invention also provides a preparation method of the nontoxic sealant, which comprises the following steps:

(S1) preparing the biodegradable filler degradable plasticizer: firstly, drying the biodegradable filler and the degradable plasticizer at 120 ℃ until the moisture content is detected to be less than or equal to 0.1% for later use;

(S2) mixing and preparing main materials: adding bio-based isocyanate, nitrile rubber, polyether polyol and a degradable plasticizer into a reaction kettle, heating, starting stirring, starting adding a biodegradable filler when the temperature is raised to 85 ℃, continuously heating, heating to 120-130 ℃ while stirring, starting vacuum pumping, keeping the temperature at 120-130 ℃, starting vacuum dehydration at the vacuum degree of less than or equal to 0.09Mpa, and stopping vacuum pumping when the moisture of the material is detected to be less than or equal to 0.05%;

(S3) cooling: starting stirring and cooling, adding the other raw materials except the bio-polyether polyol and the silane coupling agent when the temperature is reduced to 45-50 ℃, then continuously stirring and heating to 90-95 ℃, vacuumizing and introducing nitrogen for protection and constant-temperature reaction for 2.5-4h, starting cooling after the reaction is finished, adding the bio-polyether polyol and the silane coupling agent when the temperature is reduced to below 40 ℃, and stirring at a high speed for 0.5h to uniformly mix the materials;

(S4) discharging and packaging: discharging and packaging the uniformly mixed materials.

One or more technical solutions provided by the present application have at least the following technical effects or advantages:

according to the technical scheme, the biological base isocyanate, the nitrile rubber, the polyether polyol, the active nano calcium carbonate, the biological polyether polyol, the silane coupling agent, the degradable plasticizer, the biodegradable filler, the curing agent, the catalyst and the defoaming agent are adopted to prepare the raw materials, so that the characteristic of no environmental pollution in the preparation and application processes of the biological base isocyanate is exerted, and the plant raw material harmlessness of the biological polyether polyol is also exerted. The technical problem that the preparation and the use of the sealant in the prior art are not environment-friendly enough is effectively solved, and the technical effect of reducing the damage of the sealant to the environment is further realized.

Detailed Description

The following further describes the embodiments of the present invention. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The sealant is prepared by using dry or non-dry sticky substances such as asphaltum, natural resin or synthetic resin, natural rubber or synthetic rubber and the like as base materials, mixing with inert biodegradable fillers such as talcum powder, white clay, carbon black, titanium pigment, asbestos and the like, and then adding a degradable plasticizer, a solvent, a curing agent, an accelerant and the like. The raw materials of the sealant cause pollution or damage to the environment to a greater or lesser extent, which is not favorable for promoting environmental protection.

The technical scheme of the embodiment of the application solves the problem of environmental pollution caused by the sealant manufacturing process in the prior art by providing the nontoxic sealant, and realizes the beneficial effect of reducing environmental damage by taking the bio-based isocyanate as one of the raw materials.

The general idea of the embodiment of the invention for solving the technical problems is as follows:

the non-toxic sealant is prepared from 40-50 parts of bio-based isocyanate, 90-100 parts of nitrile rubber, 10-18 parts of polyether polyol, 30-40 parts of active nano calcium carbonate, 10-20 parts of biological polyether polyol, 2-6 parts of silane coupling agent, 20-30 parts of degradable plasticizer, 35-45 parts of biodegradable filler, 10-15 parts of curing agent, 1-3 parts of catalyst and 1-3 parts of defoaming agent. The characteristic that the preparation and application processes of the bio-based isocyanate do not pollute the environment is exerted so as to reduce the damage to the environment.

In addition, the bio-based isocyanate also has the characteristic of biodegradability, and when the sealing ring is used up and needs to be discarded, the sealing ring is buried in the soil and can be decomposed by organisms so as to reduce damage to the environment.

In order to better understand the above technical solutions, the following detailed descriptions will be provided with reference to specific embodiments.

Example 1

The non-toxic sealant is prepared from the following raw materials:

50 parts of bio-based isocyanate, 90 parts of nitrile rubber, 18 parts of polyether polyol, 30-40 parts of active nano calcium carbonate, 20 parts of bio-polyether polyol, 6 parts of silane coupling agent, 30 parts of degradable plasticizer, 45 parts of biodegradable filler, 15 parts of curing agent, 3 parts of catalyst and 3 parts of defoaming agent.

The preparation method of the nontoxic sealant is provided, and comprises the following steps:

(S1) preparing the biodegradable filler degradable plasticizer: firstly, drying the biodegradable filler and the degradable plasticizer at 120 ℃ until the moisture content is detected to be less than or equal to 0.1% for later use;

(S2) mixing and preparing main materials: adding bio-based isocyanate, nitrile rubber, polyether polyol and a degradable plasticizer into a reaction kettle, heating, starting stirring, starting adding a biodegradable filler when the temperature is raised to 85 ℃, continuously heating, heating to 120-130 ℃ while stirring, starting vacuum pumping, keeping the temperature at 120-130 ℃, starting vacuum dehydration at the vacuum degree of less than or equal to 0.09Mpa, and stopping vacuum pumping when the moisture of the material is detected to be less than or equal to 0.05%;

(S3) cooling: starting stirring and cooling, adding the other raw materials except the bio-polyether polyol and the silane coupling agent when the temperature is reduced to 45-50 ℃, then continuously stirring and heating to 90-95 ℃, vacuumizing and introducing nitrogen for protection and constant-temperature reaction for 2.5-4h, starting cooling after the reaction is finished, adding the bio-polyether polyol and the silane coupling agent when the temperature is reduced to below 40 ℃, and stirring at a high speed for 0.5h to uniformly mix the materials;

(S4) discharging and packaging: discharging and packaging the uniformly mixed materials.

Example 2

The non-toxic sealant is prepared from the following raw materials:

45 parts of bio-based isocyanate, 95 parts of nitrile rubber, 14 parts of polyether polyol, 35 parts of active nano calcium carbonate, 15 parts of bio-polyether polyol, 4 parts of silane coupling agent, 25 parts of degradable plasticizer, 40 parts of biodegradable filler, 13 parts of curing agent, 2 parts of catalyst and 2 parts of defoaming agent.

The preparation of this example is shown in example 1.

Example 3

The non-toxic sealant is prepared from the following raw materials:

40 parts of bio-based isocyanate, 100 parts of nitrile rubber, 10 parts of polyether polyol, 30 parts of active nano calcium carbonate, 10 parts of biological polyether polyol, 2 parts of silane coupling agent, 20 parts of degradable plasticizer, 35 parts of biodegradable filler, 10 parts of curing agent, 1 part of catalyst and 1 part of defoaming agent.

The preparation of this example is shown in example 1.

The seal rubber rings prepared in examples 1 to 3 were subjected to a degradation test, the details of which are as follows:

a sealing rubber ring with the thickness of 5mm and the inner diameter of 10cm is prepared according to the formula proportion and the method of the examples 1 to 3.

The comparative example is a seal of the same size prepared using a non-bio-based isocyanate.

The seal rings of examples and comparative examples were placed in the same volume of soil, 100ml of hydrochloric acid was added, the mixture was placed in a THB test chamber and subjected to constant temperature test at 75 ℃ and 75% RH for 168 hours, and the surface condition was observed by taking out, and the results were as follows:

it can be seen that the use of bio-based isocyanates facilitates biodegradation of the sealant.

In order to improve the material performance of the sealant, the mixed powder of shell powder and coconut shell powder with the weight percentage of 3 percent is added into the raw material of the example 1 to form an example 4.

The high-altitude dropping impact test is respectively carried out on the embodiment 1 and the embodiment 4, 5Kg of steel ball is used for repeatedly dropping and impacting the sealing rubber ring from 2 m high altitude, and the corresponding impact times of the product with deformation are recorded.

Therefore, the strength of the sealant can be improved by adding the shell powder and coconut shell powder mixed powder.

To demonstrate the non-toxicity of the product, example 1 and control 2 were ground into powders and 1g of the powder was fed to white rats 3 times a day for testing. Of these, comparative example 2 used a non-bio-based isocyanate, a non-biodegradable filler and a non-bio polyether polyol.

Thus, the more bio-based or biodegradable materials, the more toxic hazards can be significantly reduced.

The embodiments of the present invention have been described in detail, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.