阅读说明：本技术 一种防火胶条的制备工艺 (Preparation process of fireproof adhesive tape ) 是由 朱杰明 尹书祥 于 2020-07-08 设计创作，主要内容包括：本发明公开了一种防火胶条的制备工艺,包括以下步骤：(1)对PVC外壳原料进行造粒,然后经挤塑成型得到PVC外壳；(2)向PVC外壳内注入反应固化型防火液,然后加热烘干得到所述防火胶条。本发明通过在PVC外壳首先中注入吸附材料,通过调控防火液的配方、注入条件与加热烘干条件,使反应固化、烘干后的防火液完全填充于PVC外壳中,防火内芯与PVC外壳之间没有空隙,防火内芯与PVC外壳连接紧密,防火内芯不会与PVC外壳剥离,防火内芯也不会出现掉粉、流浆现象,防火胶条的作用效果更好。(The invention discloses a preparation process of a fireproof adhesive tape, which comprises the following steps: (1) granulating the raw material of the PVC shell, and then performing extrusion molding to obtain the PVC shell; (2) and injecting reaction curing type fireproof liquid into the PVC shell, and then heating and drying to obtain the fireproof adhesive tape. According to the invention, the adsorption material is injected into the PVC shell firstly, and the fireproof liquid after reaction curing and drying is completely filled in the PVC shell by regulating and controlling the formula, the injection condition and the heating and drying condition of the fireproof liquid, so that no gap exists between the fireproof inner core and the PVC shell, the fireproof inner core is tightly connected with the PVC shell, the fireproof inner core cannot be peeled off from the PVC shell, the phenomena of powder falling and flow pulp flowing of the fireproof inner core cannot occur, and the action effect of the fireproof adhesive tape is better.)

1. The preparation process of the fireproof adhesive tape is characterized by comprising the following steps of:

(1) granulating the raw material of the PVC shell, and then performing extrusion molding to obtain the PVC shell;

(2) and injecting reaction curing type fireproof liquid into the PVC shell, and then heating and drying to obtain the fireproof adhesive tape.

2. The preparation process of claim 1, wherein an adsorbing material is injected into the PVC shell before the reaction curing type fireproof liquid is injected into the PVC shell, and the adsorbing material is a water-based siloxane auxiliary agent.

3. The preparation process of claim 1, wherein the PVC shell raw material comprises the following components in parts by weight:

90-94 parts of PVC;

3-6 parts of an antioxidant;

3-4 parts of a flame retardant.

4. The preparation process of claim 1, wherein the reaction-curable fire-retardant liquid comprises the following components in parts by weight:

5. the process according to claim 4, characterized in that the weight ratio of sodium silicate in powder form to sodium silicate in liquid form is 4: 5.

6. the process according to any one of claims 1 to 5, wherein the temperature during the granulation is controlled to be 170 ℃ and 180 ℃, and the molding temperature during the extrusion molding is 170 ± 5 ℃.

7. The process according to any one of claims 1 to 5, wherein the injection pressure is controlled to be 0.3 to 0.8MPa when the reactive curing type fireproof liquid is injected into the PVC housing.

8. The preparation process according to any one of claims 1 to 5, wherein the heating and drying are carried out at a constant temperature of 70 +/-5 ℃ for 36 to 72 hours.

9. The preparation process according to any one of claims 1 to 5, wherein a double-sided adhesive tape is arranged on the PVC outer shell, and a protective film is arranged on the surface of the double-sided adhesive tape.

Technical Field

The invention belongs to the field of fireproof materials, and particularly relates to a preparation process of a fireproof sealing material for doors and windows.

Background

The fire prevention adhesive tape is mainly used between door leaf and door frame, door leaf and door leaf, and fire prevention adhesive tape automatic expansion when the conflagration breaing out blocks off the crack gap, and the circulation of air between two outer spaces in the separation door is effectual prevents the harm of the early dense cigarette of conflagration, toxic gas and steam to the human body to can control stretching of intensity of a fire.

The fire-retardant rubber strip generally comprises a PVC outer shell and an inner core, and the preparation process of the fire-retardant rubber strip in the prior art generally comprises the following steps: (1) preparing a PVC shell by extrusion molding; (2) preparing a fireproof inner core; (3) sheathing the fireproof inner core into the PVC shell; (4) sealing; (5) sticking double-sided adhesive; (6) and (6) packaging and inspecting. In the existing preparation process of the fireproof adhesive tape, the fireproof inner core is directly sleeved into the PVC shell, and the preparation process at least has the following problems: 1. the fireproof inner core and the PVC shell are not tightly combined, so that the function of the fireproof adhesive tape is influenced; 2. the fireproof inner core and the PVC shell are easy to degum, so that the fireproof inner core and the PVC shell are stripped and fall off; 3. when the humidity is high, the fireproof inner core is easy to generate a flow discharge phenomenon; 4. the preparation efficiency is low.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects and shortcomings in the background art, and provide a preparation process of a fireproof rubber strip, wherein the fireproof inner core and the PVC shell are not easy to separate, and the preparation efficiency is high. In order to solve the technical problems, the technical scheme provided by the invention is as follows:

a preparation process of a fireproof adhesive tape comprises the following steps:

(1) granulating the raw material of the PVC shell, and then performing extrusion molding to obtain the PVC shell;

(2) and injecting reaction curing type fireproof liquid into the PVC shell, and then heating and drying to obtain the fireproof adhesive tape.

In the preparation process, preferably, before the reaction curing type fireproof liquid is injected into the PVC shell, an adsorption material is injected into the PVC shell, and the adsorption material is a water-based siloxane auxiliary agent with lubricating, leveling, adsorbing and defoaming effects.

In the invention, the PVC shell inner cavity of the fire-proof strip is smaller, and when reaction curing type fire-proof liquid is added, the flow resistance is large, the pressure is large, and bubbles are easy to form or the flow is difficult. The adsorption material is firstly injected, so that the flowing of the fireproof liquid can be facilitated, the bubbles and the pores between the fireproof liquid and the PVC shell are reduced, and the fireproof liquid and the PVC shell are tightly adhered. According to the invention, the adsorption material is added before the reaction curing type fireproof liquid is added, and the adsorption material adopts a water-based auxiliary agent with lubricating, leveling, adsorbing and defoaming effects, so that the fireproof liquid can be filled more fully, and has fewer bubbles and fewer gaps when being added. In the present invention, Digao 410(TEGOGlide 410) is preferably used as the aqueous silicone additive.

In the preparation process, preferably, the PVC shell raw material comprises the following components in parts by weight:

90-94 parts of PVC;

3-6 parts of an antioxidant;

3-4 parts of a flame retardant.

The antioxidant and the fire retardant are added into the raw materials of the PVC shell, so that the effects of reducing smoke volume and smoke density are achieved, and the service life of the PVC shell is longer.

In the above preparation process, preferably, the reaction-curing fire-retardant liquid comprises the following components in parts by weight:

in the above preparation process, preferably, the weight ratio of the powdery sodium silicate to the liquid sodium silicate is 4: 5. the fire-proof liquid adopted by the invention is a reaction curing type fire-proof liquid, and the optimization of the components of the fire-proof liquid can ensure the filling plumpness of the fire-proof liquid during injection on one hand and can ensure no gap between the fire-proof liquid and the PVC shell after curing on the other hand. The research shows that the two effects can be exerted to a great extent by limiting the proportion of the powdery sodium silicate and the liquid sodium silicate. When the weight ratio of the powdery sodium silicate to the liquid sodium silicate is 4: and 5, the comprehensive performance of the reaction curing type fireproof liquid is better.

In the above preparation process, preferably, the temperature during the granulation is controlled to 170-.

In the above preparation process, preferably, when the reactive curing type fireproof liquid is injected into the PVC housing, the injection pressure is controlled to be 0.3-0.8 MPa. When the waterproof liquid is injected, the PVC shell is firstly bound in a 200 x 200 frame (different specifications and different quantities), the fireproof liquid is injected by using a compression pump, the fireproof adhesive tape is too small, and the pressure is controlled by using a buffer tank to reduce the pressure. Above-mentioned injection pressure needs accurate control, and injection pressure is too big can lead to the PVC shell to swell, influences the outward appearance, and injection pressure undersize, efficiency is too low, and fire prevention liquid can be injected the while solidification, influences the fine and close packing of fire prevention liquid.

In the preparation process, preferably, the heating and drying are carried out at a constant temperature of 70 +/-5 ℃ for 36-72 hours. By adopting the constant-temperature heating, the fire-proof liquid can be ensured to react thoroughly, and the existence of moisture is reduced. The curing temperature is low, and the shape of the fire-proof liquid after curing is kept.

In the above preparation process, preferably, a double-sided adhesive tape is arranged on the PVC casing, and a protective film is arranged on the surface of the double-sided adhesive tape.

The process steps in the actual production of the invention are briefly described as follows: granulating PVC shell raw materials, performing extrusion molding to obtain a PVC shell (synchronously sticking a double-sided adhesive tape and a protective film), bundling the PVC shell, injecting an adsorption material, injecting a fireproof liquid, performing primary inspection, drying at constant temperature, performing secondary inspection, packaging and delivering from a warehouse. The first step of inspection detects the following: checking whether the length and the thickness are in accordance with each other, controlling the length to be +2mm and the thickness to be +/-0.1-0.2 mm. ② whether the protective film and the double-sided adhesive are well adhered. And thirdly, whether the fire-proof liquid is full or not and whether a hole exists or not. The second part of the test detects the following: and (3) carrying out thermal expansion and cold contraction on the fire-proof liquid reaction, checking whether the size deviation exists in the middle and front and rear positions, and controlling the size deviation within 0-0.4 mm.

According to the invention, the adsorption material is injected into the PVC shell firstly, and the fireproof liquid after reaction curing and drying is completely filled in the PVC shell by regulating and controlling the formula, the injection condition and the heating and drying condition of the fireproof liquid, so that no gap exists between the fireproof inner core and the PVC shell, the fireproof inner core is tightly connected with the PVC shell, the fireproof inner core cannot be peeled off from the PVC shell, the phenomena of powder falling and flow pulp flowing of the fireproof inner core cannot occur, and the action effect of the fireproof adhesive tape is better.

Compared with the prior art, the invention has the advantages that:

1. in the preparation process, the PVC shell and the fireproof inner core are integrally formed and tightly combined, the fireproof inner core is full, no gap exists between the fireproof inner core and the PVC shell, and the phenomena that the fireproof inner core is separated from the PVC shell or falls out of the PVC shell cannot occur.

2. According to the preparation process disclosed by the invention, through constant-temperature drying, part of moisture in the fireproof liquid is evaporated and part of moisture is crystallized, so that the existence of free moisture in the fireproof inner core can be reduced.

3. The preparation process adopts the pressurized injection of the fire-proof liquid, the fire-proof liquid and the PVC shell have the similar expansion effect, and the fire-proof liquid is more tightly combined with the PVC shell after being solidified.

4. The preparation process is quick, simple and convenient, the production difficulty is lower, the product quality is better, the production efficiency is high, and at least half of time is saved compared with the prior art (respectively producing the PVC shell and the fireproof inner core, and then sleeving the fireproof inner core into the PVC shell).

5. The fireproof adhesive tape prepared by the invention has high fire resistance level and has the advantage of excellent fireproof performance.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of the fire-retardant rubber strip of the present invention.

FIG. 2 is a schematic end view of the fire-retardant rubber strip of the present invention.

Illustration of the drawings:

1. a PVC housing; 2. a fire-proof inner core.

Detailed Description

In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.

Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.

Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods. The antioxidant, the flame retardant, the curing agent, the defoaming agent, the leveling agent, the foam homogenizing agent and the like adopted in the embodiment are all conventional products in the market, and are not required to be specially customized. The above conventional auxiliary agents mentioned in the following examples and comparative examples are all of the same kind.